CN216531846U

CN216531846U - Infrared repeater, LED lamp and LED lamp lighting system

Info

Publication number: CN216531846U
Application number: CN202121046597.5U
Authority: CN
Inventors: 熊爱明; 周林; 陈俊仁
Original assignee: Jiaxing Super Lighting Electric Appliance Co Ltd
Current assignee: Jiaxing Super Lighting Electric Appliance Co Ltd
Priority date: 2020-05-15
Filing date: 2021-05-17
Publication date: 2022-05-13
Anticipated expiration: 2031-05-17
Also published as: WO2021228259A1

Abstract

The present disclosure provides an infrared repeater, an LED lamp and an LED lamp lighting system, wherein the dimmer is used for adjusting the LED lamp, characterized in that the LED lamp provides power through the dimmer, the dimmer comprises: the dimming signal generation module receives a dimming instruction and is used for outputting a dimming signal based on the received dimming instruction; the signal synthesis module is coupled to the dimming signal generation module and electrically connected to the output end of the dimmer, and is used for adjusting the power supply signal generated by the dimmer based on the dimming signal so as to output a modulation power supply synthesized with the dimming instruction; wherein, the alternating current component in the waveform of the modulation power supply is used for describing the dimming instruction.

Description

Infrared repeater, LED lamp and LED lamp lighting system

Technical Field

The disclosure relates to the field of lighting fixtures, in particular to an infrared repeater, an LED lamp and an LED lamp lighting system.

Background

LED lighting technology is rapidly advancing to replace traditional incandescent and fluorescent lamps. Compared with a fluorescent lamp filled with inert gas and mercury, the LED straight lamp does not need to be filled with mercury. Therefore, in various lighting systems for home or work places dominated by lighting options such as conventional fluorescent bulbs and tubes, various LED lamps such as LED straight tube lamps, LED bulbs, LED filament lamps, high power LED lamps or integrated LED lamps are becoming highly desirable lighting options unintentionally. Advantages of LED lamps include increased durability and longevity and lower power consumption. Thus, an LED lamp would be the best lighting option, taking all factors into account.

In a general LED lighting scheme, how to implement dimming control is a widely discussed issue. In the conventional dimming technology, there is a dimming method that adjusts an effective value of an input voltage in a phase-cut/chopper manner, thereby achieving a dimming effect. However, such dimming control significantly affects the integrity of the voltage waveform, and therefore inevitably causes various problems such as the reduction of the light emitting efficiency and the flicker of the LED lamp. In another way, a dimming signal is sent to a driving circuit in the lamp through an independent signal line, so that the driving circuit adjusts the output voltage/current according to the received dimming signal, thereby controlling the brightness of the LED lamp. In the application scene of multi-lamp setting, each LED lamp needs to be pulled out to receive the dimming signal, so that the complexity of the arrangement of the LED lamps is greatly improved, and the multi-lamp dimming control is not facilitated.

The traditional incandescent lamp can adjust the brightness of the lamp through a silicon controlled rectifier (TRIAC), but when the silicon controlled rectifier is used on an LED lamp, although a dimming signal wire does not need to be additionally connected, due to the nonlinear characteristic of an LED, the LED lamp flickers under low brightness, and the LED lamp adjusted by the silicon controlled rectifier has poor efficiency.

LED lamps in the market are various, and the existing silicon controlled dimmer cannot be 100% compatible with the LED lamps.

The digital wired dimming scheme based on the power line carrier communication protocol (DLT) bypasses the silicon controlled rectifier from a physical mechanism, so that the problem of compatibility between an LED lamp and a dimming switch (or a dimmer) is solved, the compatibility between the LED DLT dimming lamp and DLT dimming switches of different brands can reach 100%, the DLT dimming lamp is completely free of stroboflash, smooth and noiseless in dimming, the lowest dimming depth can reach 1%, the cost is completely comparable to that of the silicon controlled rectifier scheme, and the market development potential is worthy of expectation.

Although DLT has great market potential, since the disclosure of the DLT protocol, no mature solution has emerged in the market due to the difficulty of developing DLT dimming fixtures. There is some resistance to the truly large-area popularization and application of DLT dimming technology.

Common circuit sensors (such as human body sensors, light sensors, etc.) generally use a resistance-capacitance voltage reduction method to supply power. The whole circuit sensor presents capacitive impedance, and the capacitive impedance can interfere with a power signal to influence signal transmission on a power line, so that the DLT dimming system cannot work normally. In addition, the resistance-capacitance voltage reduction power supply circuit is easy to fail when used in a wide-voltage power grid environment. There is therefore a need for improvements in circuit sensors to be compatible with DLT dimming systems.

In addition, when the lighting system includes a plurality of lamps, and one or more lamps in the system are failed to cause breakdown of the whole lighting system, efficient maintenance cannot be performed in a way of simply replacing the lamps.

In addition, there is a dimmer that can only add a signal line to accomplish dimming in addition to the power line, and this dimmer adds a switch on the signal line, utilizes the switching signal to carry out the dimming of two grades, and the cost is lower, but can not realize continuous dimming.

In the existing wireless signal control technology, the infrared technology is mature, the cost is low, and the wireless signal control technology can be used as a wireless control scheme.

However, since the transmission of infrared rays has directivity and the signal attenuates with the increase of the distance, when the lamp cluster needs to be controlled, some lamps cannot normally receive the control signal, and thus the synchronous control cannot be performed. When an obstacle exists between the remote controller and the lamp, the lamp cannot be normally controlled.

In view of the above, the present disclosure and embodiments thereof are set forth below.

Disclosure of Invention

This abstract describes many embodiments of the "present disclosure". The term "present disclosure" is used herein to describe only some embodiments disclosed in the specification (whether or not in the claims), and not a complete description of all possible embodiments. Certain embodiments of various features or aspects described below as "the present disclosure" may be combined in various ways to form an LED straight tube lamp or a portion thereof.

An embodiment of the present disclosure provides an LED lamp lighting system, which includes: the input end of the dimmer is electrically connected to the first external power supply input end and used for receiving an external power signal and generating a dimming signal; and the LED lamp is electrically connected to the first output end, the second output end and the second external power supply input end of the dimmer and used for receiving the dimming signal and adjusting the brightness or the color temperature of the LED lamp.

In an embodiment of the present disclosure, the LED lamp includes: the demodulation module is electrically connected to the dimmer and used for receiving the dimming signal and converting the dimming signal into a dimming control signal; the LED driving module is electrically connected to the external power supply and the demodulation module and used for performing power supply conversion on an external power signal to generate a driving power supply and adjusting the driving power supply according to the received dimming control signal; and the LED module is electrically connected to the LED driving module and used for receiving the driving power supply and lightening the driving power supply.

In an embodiment of the present disclosure, the dimmer includes a first switch and a second switch, a first pin of the first switch is electrically connected to the first external power input terminal, and a second pin of the first switch is electrically connected to the LED driving module, so as to be used as a switch of the LED lamp lighting system; the first pin of the second switch is electrically connected to the second pin of the first switch, and the second pin of the second switch is electrically connected to the demodulation module for generating a dimming signal.

In an embodiment of the present disclosure, the first switch is a normally open switch; the second switch is a inching switch and is normally opened.

In an embodiment of the present disclosure, the dimmer includes a first switch, a third switch, and a fourth switch, a first pin of the first switch is electrically connected to the first external power input terminal, a first pin of the third switch and a first pin of the fourth switch are electrically connected to the second pin of the first switch, a second pin of the third switch is electrically connected to the LED driving module and the demodulation module, and a second pin of the fourth switch is electrically connected to the LED driving module and the demodulation module.

In an embodiment of the disclosure, the third switch and the fourth switch are jog switches and are set to be normally closed.

In an embodiment of the disclosure, the third switch and the fourth switch are configured to be unable to be turned off simultaneously.

An embodiment of the present disclosure provides an LED lamp lighting system, which includes: the input end of the dimmer is electrically connected to the first external power supply input end and used for converting the received external power signal into a dimming power signal according to a dimming instruction, and the dimming power signal comprises dimming information; and the LED lamp is electrically connected to the output end of the dimmer and the input end of the second external power supply and used for dimming according to the received dimming power signal.

In an embodiment of the disclosure, the external power signal is a commercial power ac signal, and the dimmer performs phase-cut processing on the external power signal according to the dimming command to generate the dimming power signal.

In an embodiment of the present disclosure, the phase-cut angle of the phase-cut process is smaller than 90 degrees, and the size of the phase-cut angle corresponds to the brightness of the LED lamp.

In an embodiment of the disclosure, when the phase-cut angle is a certain value, and the amplitude of the external power signal changes, the brightness of the LED lamp is not changed.

In one embodiment of the present disclosure, the dimmer includes: the dimming signal generation module is used for generating a dimming signal according to the received dimming instruction; the zero-crossing detection module is electrically connected to the first external power supply input end and the second external power supply input end and used for detecting the zero-crossing point of the external power signal and generating a zero-crossing signal; the data modulation module is electrically connected to the first external power supply input end and used for rectifying the external power signal and loading the dimming signal to the external power signal to generate the dimming power signal; the filter circuit is electrically connected to the data modulation module and used for filtering the received rectified signal to generate a filtered signal; the power supply module is electrically connected to the filter circuit and used for performing power supply conversion on the filtered signal to generate a power supply signal for the light modulator to be suitable; and the control module is electrically connected to the zero-crossing detection module and used for receiving the zero-crossing signal, starting data modulation at a specific time after the zero-crossing, and loading the dimming signal on the external power signal to generate the dimming power signal.

In an embodiment of the disclosure, the dimming signal generation module includes a wireless remote controller and a signal receiving module, the wireless remote controller is configured to convert the dimming command into a wireless dimming signal, and the signal receiving module is configured to convert the wireless dimming signal into the dimming signal.

In an embodiment of the present disclosure, the dimming signal generating module includes a light sensing module, and the light sensing module generates the dimming signal according to an intensity of ambient light.

In an embodiment of the present disclosure, the data modulation module includes a first diode, a second diode, a first zener diode, a first transistor, a second transistor, and a third transistor; the anode of the first diode is electrically connected to the external power input end and the first pin of the first transistor, and the cathode of the first diode is electrically connected to the cathode of the second diode and the cathode of the first voltage stabilizing diode; the second pin of the first transistor is electrically connected with the second pin of the second transistor and is electrically connected to a first circuit node, and the third pin of the first transistor is electrically connected to the control module; a first pin of the second transistor is electrically connected to an anode of the second diode and an output end of the dimmer, and a third pin of the second transistor is electrically connected to the control module; the first pin of the third transistor is electrically connected to the anode of the first zener diode, the second pin of the third transistor is electrically connected to the third pin of the second transistor, and the third pin of the third transistor is electrically connected to the control module.

In an embodiment of the disclosure, the external power signal is a commercial power ac, and the data modulation module includes three working phases within an ac half-wave (within a half ac cycle): a power phase, a power phase and a data phase.

In an embodiment of the disclosure, in the power phase, the external power signal provides power to the dimmer, in the power phase, the external power signal provides power to the LED lamp, and in the data phase, the dimmer loads the dimming signal to the external power signal to generate the dimming power signal.

In an embodiment of the disclosure, during the power-up phase, the first transistor and the second transistor are in an off state.

In an embodiment of the disclosure, during the power phase, the first transistor and the second transistor are in a conducting state.

In an embodiment of the disclosure, in the data phase, the first transistor and the second transistor operate in an amplification region, and the third transistor is turned on intermittently.

In an embodiment of the disclosure, the LED lamp lighting system further includes a fault detection module electrically connected to the dimmer for performing fault detection by bypassing the dimmer.

In an embodiment of the present disclosure, the fault detection module includes a first switch electrically connected to the input end and the output end of the dimmer.

In an embodiment of the present disclosure, the LED lamp lighting system further includes a sensor electrically connected to the dimmer and the LED lamp for changing a circuit state of the sensor based on an environmental variable.

In an embodiment of the present disclosure, the environment variable is an intensity of an ambient light, whether a human body or an ambient sound is detected, or not.

In one embodiment of the present disclosure, the sensor includes: the rectifying circuit is electrically connected to an external power supply and used for rectifying the received external power signal to generate a rectified signal; the filter circuit is electrically connected with the rectifying circuit and used for filtering the rectified signal to generate a filtered signal; the power supply conversion circuit is electrically connected to the filter circuit and used for performing power supply conversion on the filtered signal to generate a low-voltage direct-current signal; the switch device is electrically connected to a power supply loop of the LED lamp, namely is connected with the LED lamp in series and is used for switching on and off the power supply loop; the sensor control module is electrically connected to the power conversion circuit and the switch device, is used for working by using the low-voltage direct-current signal and controls the on-off of the switch device according to an environment variable;

in an embodiment of the present disclosure, the rectifier circuit is a full-bridge rectifier circuit.

In an embodiment of the present disclosure, the filter circuit at least includes a capacitor.

In an embodiment of the present disclosure, the power conversion circuit is a dc buck power conversion circuit.

In an embodiment of the present disclosure, the switching device is a field effect transistor or a relay.

An embodiment of the present disclosure provides an infrared repeater, which includes: the infrared signal receiving module is used for receiving an infrared control signal; the infrared signal amplification module is electrically connected to the infrared signal receiving module and is used for amplifying the infrared control signal; and the infrared signal transmitting module is electrically connected to the infrared signal amplifying module and is used for transmitting the amplified infrared control signal.

In an embodiment of the present disclosure, the infrared signal transmitting module includes a plurality of infrared transmitting assemblies, and the infrared transmitting assemblies are arranged in an array.

In an embodiment of the present disclosure, the infrared signal receiving module includes a plurality of infrared receiving elements, and the infrared emitting elements are arranged in an array.

In an embodiment of the present disclosure, the infrared repeater is powered by a battery or commercial power.

In an embodiment of the disclosure, the infrared signal receiving module includes an infrared receiving probe, a first pin of the infrared receiving probe is electrically connected to a power source end, and a third pin of the infrared receiving probe is electrically connected to a common ground end; the infrared emission module comprises a first infrared light-emitting diode; the infrared amplification module comprises a first capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor, a first triode, a second triode and a third triode, as well as a first field effect transistor, wherein a second pin of the first capacitor is electrically connected to the common ground terminal, the first resistor and the first capacitor are connected in parallel, a first pin of the second resistor is electrically connected to a first pin of the first capacitor, a second pin of the second resistor is electrically connected to a first pin of the first triode, a second pin of the first triode is electrically connected to a second pin of the third resistor, a third pin of the first triode is electrically connected to the common ground terminal, a first pin of the third resistor is electrically connected to the power supply terminal, a first pin of the second triode and a first pin of the third triode are electrically connected and are electrically connected to a second pin of the first triode and a first pin of the fourth resistor, the second pin of the fourth resistor is electrically connected to a common ground terminal, the second pin of the second triode is electrically connected to the power supply terminal, the third pin of the second triode is electrically connected to the second pin of the third triode, the third pin of the third triode is electrically connected to the common ground terminal G, the first pin of the fifth resistor is electrically connected to the third pin of the second triode, the second pin of the fifth resistor is electrically connected to the first pin of the field first effect transistor, the second pin of the first field effect transistor is electrically connected to the cathode of the first infrared light-emitting diode, the third pin of the first field effect transistor is electrically connected to the common ground terminal, the first pin of the sixth resistor is electrically connected to the power supply terminal, and the second pin of the sixth resistor is electrically connected to the anode of the first infrared light-emitting diode.

The embodiment of the disclosure provides an LED lamp, which is characterized by comprising a driving circuit, an LED module and a demodulation module, wherein the demodulation module is electrically connected to an external power supply and used for generating a dimming control signal according to dimming information contained in an external power signal; the driving circuit is electrically connected to an external power supply and the demodulation module, and is used for performing power conversion on a received external power signal to generate a driving power supply and adjusting the driving power supply according to the dimming control signal; the LED module is electrically connected to the driving circuit and used for receiving the driving power supply to light.

In an embodiment of the present disclosure, the external power signal is a dc signal.

In an embodiment of the present disclosure, the LED lamp further includes a rectifying circuit and a filtering circuit, wherein the rectifying circuit is electrically connected to an external power supply for rectifying an external power signal to generate a rectified signal; the filter circuit is electrically connected to the rectifying circuit and is used for filtering the rectified signal to generate a filtered signal; the filtered signal is provided to a driver circuit.

In an embodiment of the present disclosure, the rectifier circuit is a full bridge rectifier circuit.

In an embodiment of the disclosure, the driving circuit is a step-down dc converting circuit.

Drawings

FIGS. 1A, 1B and 1C are functional block diagrams of LED lighting systems according to some embodiments of the present disclosure;

FIG. 1D is a block diagram of a fault detection module according to an embodiment of the disclosure;

fig. 1E is a functional block diagram of an LED lighting system according to another embodiment of the disclosure;

fig. 1F is a functional block diagram of an LED lighting system according to another embodiment of the present disclosure;

FIG. 2 is a functional block diagram of a power adapter according to some embodiments of the present disclosure;

FIG. 3 is a circuit architecture diagram of a signal conditioning module according to some embodiments of the present disclosure;

fig. 4A is a functional block diagram of a switching power supply module according to some embodiments of the present disclosure;

FIG. 4B is a circuit diagram of a power conversion circuit according to some embodiments of the present disclosure;

FIG. 4C is a schematic diagram of a circuit configuration of a power factor circuit according to some embodiments of the present disclosure;

FIG. 4D is a schematic diagram of a circuit configuration of a PFC circuit according to another embodiment of the present disclosure;

FIG. 4E is a schematic circuit diagram of a power factor correction circuit according to another embodiment of the present disclosure;

fig. 5A is a functional block diagram of a dimmer according to some embodiments of the present disclosure;

fig. 5B is a schematic circuit diagram of a dimmer according to some embodiments of the present disclosure;

fig. 5C is a schematic circuit diagram of a dimmer according to another embodiment of the present disclosure;

fig. 5D is a schematic circuit diagram of a dimmer according to another embodiment of the present disclosure;

fig. 5E is a schematic circuit diagram of a dimmer according to another embodiment of the present disclosure;

fig. 5F is a block diagram of a dimmer according to another embodiment of the present disclosure;

fig. 6A and 6B are schematic functional block diagrams of LED lighting devices according to some embodiments of the present disclosure;

FIG. 6C is a functional block diagram of a driving circuit according to some embodiments of the present disclosure;

fig. 7A is a functional block diagram of a demodulation module according to some embodiments of the present disclosure;

fig. 7B and 7C are schematic circuit architectures of LED lighting devices according to some embodiments of the present disclosure;

FIG. 7D is a functional block diagram of a demodulation module according to some embodiments of the present disclosure;

fig. 7E is a waveform diagram of a demodulation module according to some embodiments of the present disclosure;

FIG. 7F is a circuit diagram of a demodulation module according to an embodiment of the disclosure;

fig. 7G is a circuit diagram of a demodulation module according to another embodiment of the disclosure;

fig. 8A and 8B are signal waveforms of a dimmer according to some embodiments of the present disclosure;

fig. 8C is a schematic diagram of a dimming waveform of an LED lighting system according to the present disclosure;

FIG. 8D is a schematic diagram of a dimming waveform according to an embodiment of the present disclosure;

FIG. 8E is a schematic diagram of a dimming waveform according to another embodiment of the present disclosure;

FIGS. 8F and 8G are schematic diagrams illustrating the relationship between the phase-cutting angle, the demodulated signal and the brightness of the LED module according to some embodiments of the present disclosure;

FIG. 8H is a schematic diagram of an input power waveform of an LED lighting device at different grid voltages according to some embodiments of the present disclosure;

fig. 8I is a waveform diagram of a dimming power signal of an LED lighting system according to an embodiment of the disclosure;

FIGS. 9A-9D are signal waveforms of an LED lighting device according to some embodiments of the present disclosure;

10A and 10B are flowcharts illustrating steps of a dimming control method of an LED lighting device according to some embodiments of the present disclosure;

fig. 10C and 10D are flowcharts illustrating steps of a dimming control method of an LED lighting system according to some embodiments of the present disclosure;

FIG. 11A is a circuit diagram of a zero crossing detection module according to an embodiment of the disclosure;

FIG. 11B is a circuit diagram of a data modulation module according to an embodiment of the disclosure;

fig. 12A is a schematic circuit diagram of a rectifying circuit according to an embodiment of the disclosure;

fig. 12B is a schematic circuit diagram of a rectifier circuit according to another embodiment of the disclosure;

fig. 12C is a schematic circuit diagram of a filter circuit according to an embodiment of the disclosure;

FIG. 12D is a schematic circuit diagram of a filter circuit according to another embodiment of the disclosure

Fig. 12E is a circuit diagram of a dimming signal generation module according to an embodiment of the disclosure;

fig. 13A and 13B are schematic circuit diagrams of LED modules according to some embodiments of the present disclosure;

fig. 14A is a schematic circuit diagram of a fault detection module according to an embodiment of the disclosure;

fig. 14B is a schematic circuit diagram of a fault detection module according to another embodiment of the disclosure;

fig. 15A is a circuit schematic diagram of a dimmer according to an embodiment of the present disclosure;

fig. 15B is a circuit schematic diagram of a dimmer according to another embodiment of the present disclosure;

fig. 16A is a waveform diagram of a dimming signal according to an embodiment of the disclosure;

fig. 16B is a waveform diagram of a dimming signal according to another embodiment of the present disclosure;

fig. 16C is a waveform diagram of a dimming signal according to another embodiment of the present disclosure;

FIG. 17 is a schematic diagram of a frame of a lighting system according to yet another embodiment of the present disclosure;

FIG. 18A is a schematic diagram of a lighting system according to yet another embodiment of the present disclosure;

FIG. 18B is a schematic view of an illumination system according to another embodiment of the present disclosure;

FIG. 18C is a block diagram of an illumination system according to yet another embodiment of the present disclosure;

FIG. 19A is a schematic diagram of an exemplary embodiment of an infrared repeater;

fig. 19B is a schematic circuit diagram of an infrared repeater according to an embodiment of the disclosure;

FIG. 20 is a schematic diagram illustrating an operating waveform of an infrared repeater according to an embodiment of the present disclosure;

FIG. 21 is a signal coverage diagram of an infrared repeater according to an embodiment of the present disclosure;

FIG. 22A is a schematic diagram of a circuit configuration of a sensor according to an embodiment of the present disclosure;

fig. 22B is a schematic circuit diagram of a sensor power supply module according to an embodiment of the disclosure;

FIG. 22C is an equivalent circuit diagram of the circuit structure shown in FIG. 22B according to the present disclosure; and

fig. 22D is a schematic circuit diagram of a sensor according to another embodiment of the disclosure.

Detailed Description

The present disclosure provides an LED lighting system, an LED dimmer, an LED lighting device and a dimming control method to solve the above-mentioned problems and problems in the related art. In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, embodiments accompanied with figures are described in detail below. The following description of the various embodiments of the present disclosure is provided for illustration only and is not intended to represent all embodiments of the present disclosure or to limit the present disclosure to particular embodiments.

In addition, various embodiments are described herein in order to clearly illustrate the various disclosed features of the present disclosure. But not to mean that the various embodiments can only be practiced individually. One skilled in the art can design the present invention by combining various possible embodiments or by replacing replaceable components/modules in different embodiments according to the design requirements. In other words, the embodiments taught by the present disclosure are not limited to the aspects described in the following embodiments, but include various embodiments/components/modules, substitutions and permutations thereof as appropriate.

Fig. 1A is a schematic block diagram of an LED lighting system of some embodiments of the present disclosure. Referring to fig. 1A, the LED lighting system 10 of the present embodiment includes a dimmer 80 and an LED lighting device 100, wherein the LED lighting device 100 further includes a power module PM and an LED module LM. In other embodiments, the LED lighting system may also be referred to as an LED lamp lighting system.

In the LED lighting system 10, an input terminal of the dimmer 80 is electrically connected to the external power grid EP to receive the input power Pin from the external power grid EP. The output end of the dimmer 80 is electrically connected to the LED lighting device 100 through the first connection end T1 and the second connection end T2 of the LED lighting device 100, so as to provide the modulated power Pin _ C after dimming processing to the LED lighting device 100. In other words, the external power grid EP is electrically connected to the LED lighting device 100 through the dimmer 80 to supply power to the LED lighting device 100. The input power Pin or the modulation power Pin _ C may be an ac power, and may refer to at least one of an input voltage, an input current, and an input power. The external grid EP may be mains or a ballast. In addition, in the LED lighting system 10, the power supply loop formed between the external power grid EP and the LED lighting device 100 may be defined as a bus bar.

The LED lighting device 100 may include one or more LED lighting devices 100_1-100_ n (denoted by n, where n is a positive integer greater than or equal to 1), where each LED lighting device 100_1-100_ n has a similar or identical configuration. In the following, the LED illumination device 100_1 is taken as a representative example, and the LED illumination device 100 is electrically connected to the LED illumination system 10. The LED lighting device 100_1 receives the modulated power supply Pin _ C from the first connection terminal T1 and the second connection terminal T2, wherein the power module PM generates the driving power Sdrv based on the modulated power supply Pin _ C and provides the driving power Sdrv to the LED module LM, so that the LED module LM is turned on in response to the driving power Sdrv. In an embodiment with a plurality of LED lighting devices 100_1-100_ n (i.e., n ≧ 2), each LED lighting device 100_1-100_ n may be configured in parallel with each other, i.e., the first connection terminals T1 of each LED lighting device 100_1-100_ n are electrically connected together and the second connection terminals T2 of each LED lighting device 100_1-100_ n are electrically connected together. In other embodiments, the driving power Sdrv may also be referred to as a driving signal.

In some embodiments, the LED lighting device 100 may be any type of LED lamp driven by ac power, such as an LED spotlight, an LED down lamp, an LED bulb, an LED track lamp, an LED panel lamp, an LED ceiling lamp, an LED straight lamp, or an LED filament lamp, which is not limited by the disclosure. In the embodiment where the LED lighting device 100 is a straight LED lamp, the LED lighting device 100 may be a straight LED lamp of a built-in driving Type, such as a straight ballast-compatible (Type-a) lamp or a straight ballast-bypass (Type-B) lamp.

From the overall operation of the LED lighting system 10, the dimmer 80 performs dimming processing on the input power Pin according to a dimming command DIM, and generates a processed modulated power Pin _ C accordingly. The user can give a corresponding dimming command DIM to the dimmer 80 through a control interface 50. The control interface 50 may be implemented in various forms such as a switch, a knob, a touch panel, or a wireless signal receiver, which is not limited by the disclosure. In addition, the dimming process may be to change signal characteristics of the input power Pin, such as conduction angle, frequency, amplitude, phase, or a combination thereof, according to different selected dimming manners. The dimmer 80 comprises at least one controllable electronic component (not shown), such as a thyristor, a single chip, a transistor, etc., electrically connected to the bus or capable of influencing the current/voltage of the bus. The controllable electronic component can adjust the signal characteristics of the input power Pin in response to the dimming command DIM, so that the input power Pin is converted into an adjusted modulation power Pin _ C. In the configuration of the LED lighting system 10 of the present embodiment, the dimmer 80 may be regarded as performing signal characteristic adjustment on the ac input power Pin to generate the ac modulation power Pin _ C with the dimming signal, that is, the dimming-processed modulation power Pin _ C of the present embodiment is composed of at least an ac component and a dimming signal component, and the following embodiments further describe the configuration of the dimmer 80.

When the LED lighting apparatus 100 receives the modulation power Pin _ C, on one hand, the power module PM further converts the modulation power Pin _ C into a stable driving power Sdrv for the LED module LM, and on the other hand, the power module PM generates the driving power Sdrv with different voltages (which may be called driving voltages), currents (which may be called driving currents) and/or pulse widths based on the signal characteristics of the different modulation power Pin _ C. After the driving power Sdrv is generated, the LED module LM is turned on and emits light in response to the driving power Sdrv. The brightness of the LED module LM is related to the driving voltage, the driving current, and/or the pulse width, the driving voltage and/or the driving current is adjusted based on the signal characteristic of the modulation power Pin _ C, and the signal characteristic of the modulation power Pin _ C is controlled by the dimming command DIM. In other words, the dimming command DIM is directly related to the light emitting brightness of the LED module LM. The operation of the power module PM for converting the modulated power Pin _ C into the driving power Sdrv may include, but is not limited to, signal processing processes such as rectification, filtering, and dc-dc conversion. Additional embodiments are described further below with respect to this section.

Under the arrangement of the plurality of LED lighting devices 100_1-100_ n (n ≧ 2), the modulated power Pin _ C is simultaneously provided to the LED lighting devices 100_1-100_ n, so that the LED lighting devices 100_1-100_ n are all lighted. Therefore, in some embodiments, when the dimming command DIM is applied/adjusted, the light emitting brightness of the LED lighting devices 100_1-100 — n is synchronously changed. Since the LED lighting system 10 implements dimming control by adjusting the signal characteristics of the input power Pin, it is not necessary to pull an independent signal line on each of the LED lighting devices 100_1 to 100 — n to receive a dimming signal, which greatly simplifies the wiring and installation complexity in a multi-lamp control application environment.

FIG. 1B is a schematic block diagram of an LED lighting system of further embodiments of the present disclosure. The present embodiment is a system configuration diagram showing a dimmer included in a power adapter. Referring to fig. 1B, the LED lighting system 20 of the present embodiment includes a power adapter PA and an LED lighting device 200. In the LED lighting system 20, the power adapter PA is disposed outside the LED lighting device 200 and is configured to convert the ac input power Pin into the power signal, wherein the power adapter PA includes a dimmer 80, which performs dimming processing on the power signal converted by the power adapter PA according to the dimming command DIM and accordingly generates the processed modulated power Pin _ C. Compared to the aforementioned embodiment shown in fig. 1A, in the configuration of the LED lighting system 20 of the present embodiment, the dimmer 80 can be regarded as performing signal characteristic adjustment on the rectified input power Pin to generate the dc modulated power Pin _ C with the dimming signal, that is, the dimmed modulated power Pin _ C of the present embodiment is composed of at least a dc component and a dimming signal component, and the configuration of the dimmer 80 will be further described in the following embodiments. In some embodiments, the input power source may also be referred to as an external power source, which is the same meaning, and the invention is not limited thereto.

Similar to the embodiment of fig. 1A, the LED lighting device 200 of the present embodiment may also include one or more LED lighting devices 200_1-200_ n (n is a positive integer greater than or equal to 1), wherein each of the LED lighting devices 200_1-200_ n has a similar or identical configuration and is similar to the LED lighting devices 100_1-100_ n. Therefore, the configuration and operation of the power module PM and the LED module LM of each of the LED lighting devices 200_1-200 — n can be referred to the foregoing embodiments, and will not be repeated herein. Incidentally, since the modulated power Pin _ C provided by the dimmer 80 to the LED lighting apparatus 100 in the embodiment of fig. 1A is an ac power, and the modulated power Pin _ C provided by the power adapter PA to the LED lighting apparatus 200 in the embodiment of fig. 1B is a power supply signal, the power modules PM in the

LED lighting apparatuses

100 and 200 may have different configurations according to the types of received power. For example, the power module PM in the LED lighting device 100 may include a rectifier circuit, a filter circuit, a dc-dc conversion circuit, and the like; the power module PM in the ED lighting device 200 may include only the filter circuit and the dc-dc conversion circuit, and does not include the rectifier circuit.

In some embodiments, the LED lighting device 200 may be any type of LED lamp driven by a power supply signal, such as an LED spotlight, an LED down lamp, an LED bulb, an LED track lamp, an LED panel lamp, an LED ceiling lamp, an LED straight lamp, or an LED filament lamp used with an external power adapter, which is not limited by the disclosure. In the embodiment where the LED lighting device 200 is a straight LED lamp, the LED lighting device 200 may be an external drive Type (Type-C) straight LED lamp.

Fig. 2 is a functional block diagram of a power adapter according to some embodiments of the present disclosure. Referring to fig. 2, in some embodiments, the power adapter PA includes a signal conditioning module 60, a switching power module 70, and a dimmer 80.

The signal adjusting module 60 receives the input power Pin and is configured to perform signal adjustment such as rectification and filtering on the ac input power Pin. The switching power supply module 70 is electrically connected to the signal adjusting module 60, and is configured to perform power conversion (power conversion) on the signal-adjusted input power Pin to generate and output a stable power supply signal. The dimmer 80 is electrically connected to the switching power supply module 70, and is configured to modulate the power supply signal output by the switching power supply module 70, so as to convert the dimming command DIM into a specific form/signal characteristic and load the specific form/signal characteristic onto the power supply signal output by the switching power supply module 70, thereby generating a modulated power supply Pin _ C after the dimming processing. Some configuration embodiments of the modules in the power adapter PA are described below with reference to fig. 3 to 5B, respectively.

Fig. 3 is a circuit architecture diagram of a signal conditioning module according to some embodiments of the present disclosure. Referring to fig. 3, in some embodiments, the signal conditioning module 60 includes a rectifying circuit 61 and a first filtering circuit 62. The rectifying circuit 61 receives the input power Pin through the rectifying input terminal, rectifies the input power Pin, and then outputs a rectified signal through the rectifying output terminal. The rectifying circuit 61 may be a full-wave rectifying circuit, a half-wave rectifying circuit, a bridge rectifying circuit or other types of rectifying circuits, but the disclosure is not limited thereto. In fig. 3, the rectifying circuit 61 is illustrated as a full-wave rectifying bridge composed of four diodes D11-D14, wherein the anode of the diode D11 and the cathode of the diode D12 are electrically connected together as a first rectifying input terminal of the rectifying circuit 61, and the anode of the diode D13 and the cathode of the diode D14 are electrically connected together as a second rectifying input terminal of the rectifying circuit 61. Further, the cathodes of diodes D11 and D13 are electrically connected together as a first rectified output of the rectifying circuit 61, and the anodes of diodes D12 and 14 are electrically connected together as a second rectified output of the rectifying circuit 61.

The input end of the first filter circuit 62 is electrically connected to the rectification output end of the rectification circuit 61 to receive the rectified signal, filter the rectified signal to generate a filtered signal, and output the filtered signal from the first filter output end Ta1 and the second filter output end Ta 2. The first rectified output terminal can be regarded as a first filter input terminal of the first filter circuit 62, and the second rectified output terminal can be regarded as a second filter input terminal of the first filter circuit 62. In some embodiments, the first filter circuit 62 may filter out ripples in the rectified signal such that the resulting filtered signal has a smoother waveform than the rectified signal. In addition, the first filter circuit 62 can be configured with a selection circuit to filter a specific frequency to filter out the response/energy of the external driving power source at the specific frequency. In some embodiments, the first filter circuit 62 may be a circuit composed of at least one of a resistor, a capacitor and an inductor, such as a parallel capacitor filter circuit or a pi filter circuit, but the disclosure is not limited thereto. In fig. 3, the first filter circuit 62 is illustrated as an example of a capacitor C11, wherein a first terminal of the capacitor C11 (also referred to as the first filter output Ta1) is electrically connected to cathodes of the diodes D11 and D13 through a first rectification output terminal, and a second terminal of the capacitor C11 (also referred to as the second filter output Ta2) is electrically connected to anodes of the diodes D12 and D14 through a second rectification output terminal.

In some embodiments, the signal conditioning module 60 further includes a second filter circuit 63 and/or a third filter circuit 64, wherein the second filter circuit 63 is a filter circuit connected in series between the external power grid and the rectifying circuit 61, and the third filter circuit 64 is a filter circuit electrically connected to the rectifying input terminal of the rectifying circuit 61 and connected in parallel with the rectifying circuit 61. The second filter circuit 63/the third filter circuit 64 can suppress high-frequency interference in the input power Pin or limit current, so that the signal stability of the input power Pin is better. Similar to the first filter circuit 62, the second filter circuit 63 and the third filter circuit 64 may also be a circuit composed of at least one of a resistor, a capacitor and an inductor, which is not limited in the present disclosure. In fig. 3, the second filter circuit 63 is illustrated as an example with inductors L11 and L12, wherein the inductor L11 is connected in series between one of the live line and the neutral line of the external power grid EP and the first rectifying input terminal of the rectifying circuit 61, and the inductor L12 is connected in series between the other of the live line and the neutral line of the external power grid EP and the second rectifying input terminal of the rectifying circuit 61. In some embodiments, the inductances L11 and L12 may be common mode inductances or differential mode inductances. The third filter circuit 64 of fig. 3 is illustrated as an example of a capacitor C12, wherein a first terminal of the capacitor C12 is electrically connected to the inductor L11 and the first rectifying input terminal (i.e., the connection terminal between the anode of the diode D11 and the cathode of the diode D12), and a second terminal of the capacitor C12 is electrically connected to the inductor L12 and the second rectifying input terminal (i.e., the connection terminal between the anode of the diode D13 and the cathode of the diode D14).

Fig. 4A is a functional block diagram of a switching power supply module according to some embodiments of the present disclosure. Referring to fig. 4A, in some embodiments, the switching power supply module 70 may include a power conversion circuit 71, wherein an input terminal of the power conversion circuit 71 is electrically connected to the filtering output terminals Ta1 and Ta2 of the first filtering circuit (e.g., the first filtering circuit 62 of fig. 3) to receive the filtered signal. In some embodiments, the power conversion circuit 71 may perform power conversion on the filtered signal in a current source mode to generate the stable power supply signal Sp. The power conversion circuit 71 includes a switching control circuit 72 and a conversion circuit 73, wherein the conversion circuit 73 includes a switch circuit (also referred to as a power switch) PSW and a power conversion circuit ESE. The converting circuit 73 receives the filtered signal, and converts the filtered signal into a power supply signal Sp under the control of the switching control circuit 72, and the power supply signal Sp is outputted from the first power supply terminal T1 and the second power supply terminal T2 for supplying power to the LED lamp.

Fig. 4B is a circuit architecture diagram of a power conversion circuit according to some embodiments of the present disclosure. Referring to fig. 4B, the power conversion circuit 71 of the present embodiment is a step-down dc-dc conversion circuit, which includes a switching control circuit 72 and a conversion circuit 73, wherein the conversion circuit 73 includes an inductor L21, a freewheeling diode D21, a capacitor C21 and a transistor M21, wherein the inductor L21 and the freewheeling diode D21 form a power conversion circuit ESE1, and the transistor M21 is a switch circuit PSW 1. The conversion circuit 73 is coupled to the filter output terminals Ta1 and Ta2, so as to convert the received filtered signal into the power supply signal Sp, and output the power supply signal Sp through the first power supply terminal T1 and the second power supply terminal T2.

In the present embodiment, the transistor M21 is, for example, a mosfet, and has a control terminal, a first terminal and a second terminal. The transistor M21 has a first terminal coupled to the anode of the freewheeling diode D21, a second terminal coupled to the filter output terminal Ta2, and a control terminal coupled to the switching control circuit 72 for being controlled by the switching control circuit 72 to turn on or off the first terminal and the second terminal. The first supply terminal T1 is coupled to the filter output terminal Ta1, the second supply terminal T2 is coupled to one terminal of the inductor L21, and the other terminal of the inductor L22 is coupled to the first terminal of the transistor M21. The capacitor C21 is coupled between the first power supply terminal T1 and the second power supply terminal T2 for stabilizing the voltage fluctuation between the first power supply terminal T1 and the second power supply terminal T2. The cathode of the freewheeling diode D21 is coupled to the filter output terminal Ta1 and the first supply terminal T1.

The operation of the power conversion circuit 71 is explained next. The controller 72 determines the on and off time of the switch 635 according to the current detection signals Scs1 or/and Scs2, that is, controls the Duty Cycle (Duty Cycle) of the transistor M21 to adjust the magnitude of the power signal Sp. The current sense signal Scs1 represents the magnitude of the current flowing through the transistor M21, and the current sense signal Scs2 represents the magnitude of the inductor current IL, wherein the current sense signal Scs2 can be obtained by providing an auxiliary winding coupled to the inductor L21. The switching control circuit 72 can obtain information on the magnitude of the power converted by the converter circuit based on either of the current detection signals Scs1 and Scs 2. When the transistor M21 is turned on, the current of the filtered signal flows from the filtering output terminal Ta1, and flows to the rear-end load (LED lamp) through the capacitor C21 and the first power supply terminal T1, and then flows out from the rear-end load through the inductor L21 and the transistor M21 and then flows out from the filtering output terminal Ta 2. At this time, the capacitor C21 and the inductor L21 store energy. When the transistor M21 is turned off, the inductor L21 and the capacitor C21 discharge the stored energy, and the current freewheels to the first power supply terminal T1 through the freewheeling diode D21, so that the back-end load is still continuously powered. Incidentally, the capacitor C21 is an unnecessary component and may be omitted, and is shown by a broken line in the figure. In some applications, the capacitor C21 may be omitted to stabilize the LED module current by the inductor's characteristic of resisting the change in current.

In this embodiment, the power conversion circuit 71 may adopt any one of a buck circuit, a boost circuit, and a boost-buck circuit according to a specific application.

Referring again to fig. 4A, in some embodiments, the switching power module 70 may further include a Power Factor Correction (PFC) circuit 74. The PFC circuit 74 is electrically connected between the filtering output terminals Ta1 and Ta2 of the first filtering circuit (e.g., the first filtering circuit 62 in fig. 3) and the input terminal of the power conversion circuit 71. In some embodiments, the PFC circuit 74 includes a switching control circuit 75 and a conversion circuit 76, wherein the switching control circuit 75 controls the operation of the conversion circuit 76 to perform PFC compensation on the filtered signal and generate a PFC signal, i.e., to increase the power factor of the filtered signal, so that the active power of the filtered signal is increased and the reactive power of the filtered signal is decreased.

The PFC circuit 74 may be, for example, a Boost converter circuit (Boost circuit), as shown in fig. 4C, where fig. 4C is a circuit architecture diagram of a power factor circuit according to some embodiments of the disclosure. Referring to fig. 4C, the PFC circuit 74 includes a switching control circuit 75 and a conversion circuit 76, and the conversion circuit 76 includes a resistor R22, an inductor L22, a freewheeling diode D22, a capacitor C22 and a transistor M22, wherein the inductor L22 and the freewheeling diode D22 form a power conversion circuit ESE2, and the transistor M22 is a switch circuit PSW 2. The conversion circuit 76 is coupled to the filtering output terminals Ta1 and Ta2 to convert the received filtered signal into a PFC signal, and output the PFC signal to the power conversion circuit 71 through the PFC output terminals Ta3 and Ta 4. Incidentally, the capacitor C22 is an unnecessary component and may be omitted, and is shown by a broken line in the figure. In some applications, the capacitor C22 may be omitted to stabilize the LED module current by the inductor's characteristic of resisting the change in current. In other embodiments, the power factor correction circuit may also be referred to as a power factor correction module.

Referring to fig. 4D, which is a schematic circuit architecture diagram of the power factor correction circuit of the present application in another embodiment, as shown in the figure, the input of the power factor correction circuit 74 is coupled to the first filter output terminal Ta1 and the second filter output terminal Ta2, and the output thereof is coupled to the PFC output terminals Ta3 and Ta 4. The power factor correction circuit 74 includes a multiplier 2500, a switching control circuit 75, a first comparator CP24, a second comparator CP23, a transistor M23, a resistor R23, a diode D23, and an inductor L23. One end of the inductor L23 is coupled to the first filter output terminal Ta1, the other end is coupled to the anode of the diode D23, and the cathode of the diode D23 is coupled to the PFC output terminal Ta 3. The transistor M23 has a first terminal coupled to a connection node between the inductor L23 and the diode D23, a second terminal coupled to a low reference potential (e.g., the ground GND or the ground SGND) via the resistor R23, and a control terminal coupled to an output terminal of the switching control circuit 75. The first comparator CP24 has a first input terminal coupled to the PFC output terminal Ta3, a second input terminal receiving a reference voltage Vt, and an output terminal coupled to the first input terminal of the multiplier 2500. The second input terminal of the multiplier 2500 is coupled to the first filtering output terminal Ta1, the output terminal is coupled to the second input terminal of the second comparator CP23, the first input terminal of the second comparator CP23 is coupled to the connection node between the resistor R23 and the second terminal of the transistor M23, and the output terminal is coupled to the input terminal of the switching control circuit 75.

It should be noted that at least some of the multiplier 2500, the switching control circuit 75, the first comparator CP24, and the second comparator CP23 may be integrated into a controller, so as to control the on/off of the transistor M23. The controller may also be integrated with the transistor M23. The controller is an integrated circuit, such as a control chip. The Transistor M23 can be, for example, a Metal-oxide-semiconductor Field-effect Transistor (MOSFET), a Bipolar Junction Transistor (BJT), a triode, etc.

Specifically, the power factor correction circuit 74 obtains the output voltage V0 at the PFC output terminal Ta3 and compares it with the reference voltage Vt by the first comparator CP24, and then supplies the comparison result to the first input terminal of the multiplier 2500, the second input terminal of the multiplier 2500 also obtains the voltage Vdc output by the first filter output terminal Ta1, the multiplier 2500 outputs the reference signal Vi as current feedback control based on the input of the first input terminal and the second input terminal thereof, the second comparator CP23 compares the voltage signal obtained from the resistor R23 and reflecting the peak current of the inductor L23 with the reference signal Vi, and outputs the comparison result to the switching control circuit 75 for controlling the on/off of the transistor M23, so that the waveforms of the current Ii and the voltage Vdc input to the power factor correction circuit 74 are substantially identical, thereby greatly reducing the current harmonics and improving the power factor.

Referring to fig. 4E, which is a schematic diagram of a circuit architecture of a power factor correction circuit of the present application in a further embodiment, as shown, the power factor correction circuit of fig. 4E 74 includes a controller 2510, a transformer 2511, a diode 2512, a transistor 2515, a resistor 2513_0, a resistor 2513_1, a resistor 2513_2, a resistor 2513_3, a resistor 2513_4, a resistor 2513_5, a resistor 2513_6, a resistor 2513_7, a resistor 2513_8, a capacitor 2514_0, and a capacitor 2514_ 1. The controller 2510 has an inverting input Inv, an error amplifying output Com, a multiplier input Mult, a sampling terminal Cs, an input Zcd for zero crossing detection signals, a driving output Gd, and a chip power supply terminal Vcc. One end of the transformer 2511 is coupled to the first filter output terminal Ta1, the other end is coupled to the anode of the diode 2512, and the cathode of the diode 2512 is coupled to the PFC output terminal Ta 3. The transistor 2515 has a first terminal coupled to a connection node between the transformer 2511 and the diode 2512, a second terminal coupled to the second filter output terminal Ta2 (or connected to the power ground GND or the second pin 221) via the resistor 2513_7, and a control terminal coupled to the driving output terminal Gd of the controller 2510 via the resistor 2513_ 8. The sampling terminal Cs of the controller 2510 is coupled to a connection node between the second terminal of the transistor 2515 and the resistor 2513_7 via the resistor 2513_ 6. The chip power supply terminal Vcc is electrically connected to a constant voltage for supplying power to the controller 2510. The inverting input Inv is coupled to a voltage dividing circuit formed by a resistor 2513_0 and a resistor 2513_1 in series to obtain the voltage V0 output at the PFC output Ta 3. An RC compensation network formed by the resistor 2513_5, the capacitor 2514_0 and the capacitor 2514_1 is coupled between the inverting input Inv and the error amplifying output Com. One end of the capacitor 2514_0 and one end of the capacitor 2514_1 are coupled to the inverting input Inv at the same time, and the other end of the capacitor 2514_0 is connected to the other end of the capacitor 2514_1 through the resistor 2513_5 and then connected to the error amplification output Com. The multiplier input Mult is coupled to the output of a voltage divider circuit having a resistor 2513_3 and a resistor 2513_4 connected in series with a first filter output Ta1 and a second filter output Ta2 (or ground). The input terminal Zcd of the zero crossing detection signal is coupled to the transformer 2511 via a resistor 2513_ 2.

It should be noted that the PFC output terminal Ta3 connected to the output of the PFC circuit 74 is further coupled to a capacitor 2514_1 for stabilizing the electrical signal output by the active PFC module 251 and filtering out the high frequency interference signal, and the capacitor 2514_1 is shown by a dashed line in the figure because it can be added or omitted (unnecessary components) according to the actual application. The same also includes at least one of the following circuit configurations: a resistor 2514_3 connected in parallel across the resistor 2513_4, a capacitor 2514_4 connected in parallel across the resistor 2513_1, a resistor 2513_9 coupled between the control terminal and the second terminal of the transistor 2515, a diode 2516 and a resistor 2513_10 coupled between the control terminal of the transistor 2515 and the resistor 2513_8, and a resistor 2513_6 coupled between the resistor 2513_7 and the sampling terminal Cs of the controller. The circuit configurations shown in dashed lines may also be replaced by more complex, or more compact, circuit configurations. For example, the sampling terminal Cs of the controller is connected to the resistor 2513_7 through a wire. As another example, the capacitor 2514_5 is formed by a tank circuit including at least two capacitors, and the like. An equivalent circuit, or an integrated circuit, modified based on the above examples should be considered as some specific examples of the power factor correction circuit.

In the following description of the operation of the power factor correction circuit 74 shown in fig. 4E, a dc voltage signal V0 output by the power factor correction circuit 74 is divided by a voltage divider circuit formed by serially connecting a resistor 2513_0 and a resistor 2513_1 to input to the inverting input Inv of the controller 2510, a voltage signal Vdc input to the power factor correction circuit 74 is divided by a voltage divider circuit formed by serially connecting a resistor 2513_3 and a resistor 2513_4 to input to the multiplier input Mult to determine the waveform and phase of the voltage signal Vdc, and a high-frequency current induced by a primary inductor (also called a primary coil or primary winding) of the transformer 2511 is input to the input Zcd of the zero-crossing detection signal as the zero-crossing detection signal via a mutually-inductive secondary inductor (also called a secondary coil or secondary winding) and a resistor 2513_ 2. When the transistor 2515 is turned on, the voltage signal Vdc is input to a reference low potential (e.g., the second filter output terminal Ta2, or the power ground GND, or the second pin 221) through the primary inductor of the transformer 2511 and the transistor 2515, during which the transformer 2511 stores energy (also called excitation), and the electrical signal output by the transistor 2515 is obtained by the sampling terminal Cs to sample the inductor current in the transformer 2511; in synchronization with this, multiplier input Mult of controller 2510 receives signal Vdc sampled by resistor 2513_3, and generates internal reference signal Vi based on an electric signal of sampled signal Vdc, for detecting a sampled signal acquired by sampling terminal Cs based on internal reference signal Vi. When the level value of the sampling signal obtained by the sampling terminal reaches the level value provided by the internal reference signal Vi, in other words, when it is detected that the inductor current in the primary inductor in the transformer 2511 reaches the peak value, the controller 2510 controls the transistor 2515 to be turned off. At this time, the primary inductance of the transformer 2511 is discharged (also referred to as demagnetization), and the secondary inductance of the transformer 2511 induces the discharge operation and outputs a zero-cross detection signal. When the transformer 2511 is discharged so that the current output therefrom decreases to approach the zero point, the zero-cross detection signal received by the controller 2510 also approaches the zero point, the controller 2510 determines the discharge operation end timing based on the zero-cross detection signal received by the input terminal Zcd of the zero-cross detection signal, and outputs a signal for turning on the driving transistor 2515 from the driving output terminal Gd to supply power to the rear-end circuit using control logic set based on the detection result of the detected zero-cross detection signal.

The controller 2510 may be a control chip with a dedicated circuit for optimizing harmonic distortion (or THD optimization) or power factor correction integrated therein, and is configured to effectively control cross-over distortion and ripple distortion of input current input thereto, thereby improving power factor and reducing harmonic distortion. For example, the controller 2510 may employ an L6562 chip, an L6561 chip, or an L6560 chip. The Transistor 2515 is a three-terminal controllable power device, such as a Metal-oxide-semiconductor Field-effect Transistor (MOSFET), a Bipolar Junction Transistor (BJT), a triode, or the like.

The circuit architecture of the power factor correction circuit is not limited to this, and the power factor correction circuit may also be, for example, a Boost (Boost) power factor correction circuit, a Buck (Buck) power factor correction circuit, a Boost-Buck (Boost-Buck) power factor correction circuit, a Forward (Forward) power factor correction circuit, or a Flyback (Flyback) power factor correction circuit.

The power factor correction module may also, for example, employ a passive power factor correction unit, which may be implemented by accessing a resonant filter on the ac side, thereby increasing the conduction angle of the current in the ac signal. In some specific examples, the pfc module 25 in the embodiment shown in fig. 6 may be adapted to be coupled between the first input terminal 201 and the second input terminal 202 of the dimmer 20, and the rectifying module 24, so that the pfc module 25 receives the ac signal output by the external ac power source, performs pfc on the ac signal, and then outputs the ac signal to the rectifying module 24.

In other specific examples, the method can also be implemented by adding a passive power factor correction circuit including a diode and a capacitor after the rectifier module in the circuit architecture of the rectifier module shown in fig. 3, so that the passive power factor correction circuit also has the function of a filter module. In some more specific examples of the power factor correction module with filtering function, the filtering module 23 in the embodiment shown in fig. 6 is an eligible module.

Fig. 5A is a functional block diagram of a dimmer according to some embodiments of the present disclosure. Referring to fig. 5A, the dimmer 80 includes a signal synthesizing module 81 and a command converting module 82. The signal synthesis module 81 is configured to modulate the power supply signal Sp by using the dimming signal Sdim to generate a modulated power supply Pin _ C after dimming processing; or, the power supply signal Sp and the dimming signal Sdim are synthesized and processed into the modulation power supply Pin _ C. The command conversion module 82 is configured to receive the dimming command DIM and convert the dimming command DIM into a dimming signal Sdim having a specific format. The dimming signal Sdim of a specific format may be, for example, a signal indicating a phase-cut time, a frequency-converted signal responding to dimming information, or a digital code (e.g., a square wave having a specific order of high/low levels) responding to dimming information, and the like, and the signal format may be presented in the form of a pulse or a square wave, so that the dimming signal Sdim may be a signal composed of two signal states of a high level and a low level in appearance.

In other embodiments, the instruction conversion module 82 may be referred to as a dimming signal generation module. The signal synthesis module 81 may be referred to as a signal synthesis processing module. The power conversion circuit may be referred to as a power conversion unit.

The specific circuit configuration of the dimmer 80 in some embodiments is described below with reference to fig. 5B, wherein fig. 5B is a schematic circuit architecture diagram of the dimmer according to some embodiments of the present disclosure. Referring to fig. 5B, the signal synthesis module 81 may include, for example, a power conversion circuit 71, a feedback adjustment circuit 83, and a signal generation circuit 84, where the power conversion circuit 71 may be as described in the embodiment of fig. 4B, and the related configuration and operation may refer to the description of the foregoing embodiment, which is not repeated herein. In the embodiment, the feedback adjusting circuit 83 is electrically connected to the power converting circuit 71, and is configured to generate a corresponding feedback signal according to the signal state at the power supply terminal and feed the feedback signal back to the switching control circuit 72 of the power converting circuit 71, so that the switching control circuit 72 adjusts the control of the transistor M21 according to the feedback signal, and further compensates the signal fluctuation at the power supply terminal, so as to stabilize the output. The signal generating circuit 84 is electrically connected to the feedback adjusting circuit 83, and is used for determining whether to adjust the voltage at the power supply terminal T1/T2 according to the signal state of the dimming signal Sdim.

In other embodiments, the feedback conditioning circuit 83 and the signal generating circuit 84 may be collectively referred to as a feedback conditioning unit. The feedback adjusting unit 2 adjusts the sampling signal obtained from the power supply terminal T1/T2 based on the dimming signal Sdim output by the instruction converting module 82, and outputs a feedback signal based on the adjusted sampling signal, and the feedback signal is transmitted to the power converting circuit 71; the power conversion circuit 71 performs energy conversion on the power supply signal obtained from the pin ta1/ta3 based on the feedback signal to output an output signal with a synthesized dimming signal at the power supply terminal T1/T2.

Specifically, when the dimming signal Sdim is at a low level, the signal generating circuit 84 does not adjust the voltage at the power supply terminals T1/T2, so that the feedback signal output by the feedback adjusting circuit 83 does not fluctuate significantly, and the voltage at the power supply terminals T1/T2 can be maintained to be dynamically stabilized at a set voltage.

When the dimming signal Sdim is switched from the low level to the high level, the signal generating circuit 84 pulls the voltage at the power supply terminal T1/T2 high, and the momentary pulling of the voltage affects the operation of the feedback adjusting circuit 83, so that the feedback adjusting circuit 83 outputs a corresponding feedback signal to instruct the switching control circuit 72 to adjust the voltage at the power supply terminal T1/T2 back to the set voltage. Then, when the dimming signal Sdim returns to the low level again from the high level, the voltage regulation effect of the signal generating circuit 84 on the power supply terminals T1/T2 disappears, and the power conversion circuit 71 still tends to adjust the voltage on the power supply terminals T1/T2 downward to approach the set voltage, at this time, the voltage on the power supply terminals T1/T2 is rapidly pulled back to the vicinity of the set voltage. In summary, the voltage at the power supply terminals T1/T2 is pulled up in response to the control of the signal generating circuit 84, and then is decreased back to the set voltage in response to the control of the power conversion circuit 71 and the feedback adjusting circuit 83, so that a pulse/square wave waveform superimposed on the set voltage is formed at the power supply terminals T1/T2, and the waveform is substantially synchronized with the dimming signal Sdim. The signal with the pulse/square wave waveform superimposed on the setting voltage is the modulated power Pin _ C generated by the dimmer 80.

In some embodiments, the feedback adjusting circuit 83 includes an inductor L31, a capacitor C31, resistors R31-R34, diodes D31-D32, an operational amplifier unit CP31, and an optical coupling unit U31, wherein the inductor L31, the capacitor C21, the resistors R31 and R32, and the diodes D31 and D32 may constitute a feedback auxiliary module, and the resistors R33 and R34 may constitute a resistor module.

Specifically, in the feedback auxiliary module, one end of the inductor L31 is electrically connected to the ground GND1, and is coupled to the inductor L21 to sense the signal on the inductor L21. One end of the capacitor C31 is electrically connected to the other end of the inductor L31. The anode of the diode D31 is electrically connected to the ground GND2, and the cathode of the diode D31 is electrically connected to the other end of the capacitor C31. The anode of the diode D32 is electrically connected to the cathode of the diode D31 and the other end of the capacitor C31. One ends of the resistors R31 and R32 are commonly electrically connected to the cathode of the diode D32, and the other end of the resistor R31 is electrically connected to the optical coupling unit U31. The operational amplifier unit CP31 has a first input terminal, a second input terminal and an output terminal, wherein the first input terminal is electrically connected to the other end of the resistor R32, the second input terminal is electrically connected to the resistor module and the signal generating circuit 84, and the output terminal is electrically connected to the optocoupler unit U31. In some embodiments, the first input terminal of the operational amplifier unit CP31 may also be electrically connected to a voltage regulator, but the disclosure is not limited thereto. The optical coupling unit U31 includes a light emitting element Ua and a photosensitive element Ub, wherein the anode of the light emitting element Ua is electrically connected to the other end of the resistor R31, and the cathode of the light emitting element Ua is electrically connected to the output end of the operational amplifier unit CP 31; one end of the photosensitive element Ub is electrically connected to a bias voltage source Vcc1 (which may be generated by dividing the bus voltage or by using an auxiliary winding), and the other end of the photosensitive element Ub is electrically connected to the feedback control end of the switching control circuit 72.

The resistor module is used for dividing the voltage at the power supply terminal T1 and providing a divided signal to the operational amplifier unit CP 31. In the resistor module, resistors R33 and R34 are connected in series between the power supply terminal T1 and the ground terminal GND2, and the connection terminals of the resistors R33 and R34 are electrically connected to the second input terminal of the operational amplifier unit CP 31. In other words, the second input terminal of the operational amplifier CP31 can be regarded as being electrically connected to the voltage dividing point of the resistor module to receive the voltage dividing signal, i.e. the sampling signal. The signal output by the operational amplifier unit CP31 is a feedback signal and is transmitted to the switching control circuit 72 through the optical coupling unit U31.

The signal generating circuit 84 includes a resistor R35 and a transistor M31. One end of the resistor R35 is electrically connected to the second input terminal of the op-amp unit CP31 and the connection end of the resistors R33 and R34. The transistor M31 has a first end, a second end and a control end, wherein the first end is electrically connected to the other end of the resistor R35, the second end is electrically connected to the ground GND2, and the control end is electrically connected to the command converting circuit 82 for receiving the dimming signal Sdim.

In other embodiments, the signal generation circuit 84 may be referred to as a conditioning circuit; the resistor R33 and the resistor R34 may be referred to as sampling circuits; the operational amplifier unit CP31 may be referred to as a comparison circuit; the optical coupling unit U31 may be referred to as a signal transmission circuit; and, the inductor L31, the capacitor C31, the diodes D31, D31 may be referred to as a reference signal generation circuit. The first input terminal of the operational amplifier unit may be a forward input terminal, and the second input terminal thereof may be a reverse input terminal.

The specific circuit operation of the dimmer 80 is illustrated with reference to fig. 8A and 8B, wherein fig. 8A and 8B are schematic signal waveforms of dimmers according to some embodiments of the present disclosure. In the embodiment, the dimming signal Sdim is a pulse signal with a frequency changing according to the brightness information indicated by the dimming command DIM, but the disclosure is not limited thereto.

Referring to fig. 5B and fig. 8A, when the command conversion circuit 82 receives a command indicating to adjust the brightness to 30% of the maximum brightness, the command conversion circuit 82 generates a dimming signal Sdim with a period T1 to be provided to the control terminal of the transistor M31. During the low period of the dimming signal Sdim, the transistor M31 is kept turned off, so that the resistor R35 can be regarded as a floating state, and the voltage of the power supply terminal T1 and the operation of the feedback regulating circuit 83 are not affected. During the high level of the dimming signal Sdim, the transistor M31 is turned on, so that the resistor R35 is equivalently connected in parallel with the resistor R34. At this time, since the resistors R34 and R35 connected in parallel lower the impedance between the second input terminal of the operational amplifier unit CP31 and the ground terminal GND2, the voltage at the power supply terminal T1 is correspondingly raised. On the other hand, since the operational amplifier unit CP31 responds to the voltage variation at the second input terminal thereof to change the signal at the output terminal, the signal variation at the output terminal of the operational amplifier unit CP31 affects the light emitting amount of the light emitting element Ua, so that the conduction degree of the light sensitive element Ub changes accordingly. The change in the conduction degree of the photo-resistor Ub affects the magnitude of the voltage fed back to the feedback control terminal of the switching control circuit 72, so that the switching control circuit 72 tends to decrease the duty cycle of the transistor M21 during the high level of the dimming signal Sdim to rapidly pull down the suddenly raised voltage at the power supply terminal T1 to the set voltage Vset.

Therefore, when the dimming signal Sdim returns to the low level again from the high level, the voltage at the power supply terminal T1 also quickly returns to the set voltage Vdet, so that the modulated power supply Pin _ C forms a pulse with a period T1 substantially synchronous with the dimming signal Sdim based on the set voltage Vdet. Overall, it can be seen that the dimming signal Sdim is superimposed on the power supply signal Sp to form the modulated power supply Pin _ C.

From another perspective, when the dimming signal Sdim is switched from the low level to the high level, the transistor R35 is turned on, the resistors R35 and R34 are connected in parallel, so that the impedance between the second input terminal of the operational amplifier unit CP31 and the ground terminal GND2 is decreased, the divided voltage at the second input terminal of the operational amplifier unit CP31 is decreased, while the voltage at the first input terminal of the operational amplifier unit is unchanged, in order to continuously maintain the voltage at the second input terminal of the operational amplifier unit CP31 and the voltage at the first input terminal to keep the same level, the output signal of the operational amplifier unit CP31 is transmitted to the switching control circuit 72 through the signal transmission circuit U31, so that the switching control circuit 72 adjusts the output voltage of the power conversion circuit (i.e., the voltage at the power supply terminal T1) to be increased, and when the voltage at the power supply terminal T1 is increased, the divided voltage at the second input terminal of the operational amplifier unit CP31 is increased to the same level as the first input terminal. As a whole, in the low level period of the dimming signal Sdim, the transistor M31 is turned off, and the voltage at the power supply terminal T1 is the set voltage Vset; when the dimming signal Sdim is high, the transistor M31 is turned on, and the voltage of the power supply terminal T1 increases. The magnitude of the voltage rise at terminal T1 is related to resistors R33, R34 and R35.

In other embodiments, the resistance value of the resistor in the sampling circuit may also be changed to realize that the voltage of the power supply terminal T1 is the set voltage Vset when the dimming signal is at a low level; when the dimming signal Sdim is at a high level, the voltage of the power supply terminal T1 decreases.

In this embodiment, a first input terminal of the operational amplifier unit CP31 is coupled to a constant voltage source or a reference signal generating circuit for receiving a reference signal Vref.

Referring to fig. 5B and fig. 8B, when the command converter circuit 82 receives a command indicating to adjust the brightness to 80% of the maximum brightness, the command converter circuit 82 generates the dimming signal Sdim with a period T2 to be provided to the control terminal of the transistor M31, wherein the period T2 is smaller than the period T1, i.e., the frequency of the dimming signal Sdim corresponding to 30% of the maximum brightness is lower than the frequency of the dimming signal Sdim corresponding to 70% of the maximum brightness. During the low level and the high level of the dimming signal Sdim, the feedback adjusting module 83 and the signal generating module 84 operate similarly to the above embodiments, so that the modulated power supply Pin _ C forms a pulse having a period T2 substantially synchronous with the dimming signal Sdim based on the setting voltage Vdet. Overall, it can be seen that the dimming signal Sdim is superimposed on the power supply signal Sp to form the modulated power supply Pin _ C.

In the above embodiment, the signal synthesis module 81 can be regarded as a part of the signal synthesis implemented by the configuration of the existing power conversion circuit 71, and therefore the power conversion circuit 71 is regarded as a part of the signal synthesis module 81. However, in some embodiments, the signal synthesis module 81 may also be regarded as not including the power conversion circuit 71 (i.e. only including the feedback adjustment circuit 83 and the signal generation circuit 84), and the signal synthesis module 81 cooperates with the power conversion circuit 71 to generate the modulated power Pin _ C. In addition, in other embodiments, the feedback adjusting circuit 83 may also be considered as a part of the power converting circuit 71. For the specific configuration of the power conversion circuit 71, reference may be made to the foregoing embodiments, and detailed description thereof is not repeated.

Fig. 5C is a schematic diagram of a circuit architecture of a dimmer according to another embodiment of the invention. The circuit structure of the dimming in this embodiment is similar to that of the embodiment shown in fig. 5B, except that in this embodiment, the signal generating circuit 84 includes a transistor M31, B connected in parallel with a resistor R36. The sampling circuit comprises resistors R33, R34 and R36, and the three resistors are connected in series to a power supply terminal T1 and a ground terminal GND 2. The signal generating circuit 84 bypasses the resistor R36 in the sampling circuit to adjust the impedance between the second input terminal of the operational amplifier CP31 and the ground terminal GND2, thereby affecting the voltage at the power supply terminal T1. The actions of the other parts are the same as those of the previous embodiment, and are not described again here. In other embodiments, the impedance between the second input terminal of the operational amplifier unit CP31 and the ground terminal GND2 can be adjusted in other manners, such as using a controlled variable resistor, which is exemplified by a power tube whose linear region corresponds to the voltage variation interval of the dimming signal. For example, the controlled variable resistor may be connected in series or in parallel to a voltage dividing resistor in the sampling circuit, and a control terminal of the variable resistor receives the dimming signal Sdim to change a resistance value according to a change in an amplitude of the dimming signal Sdim, so as to adjust the sampling signal output by the sampling circuit. The signal amplitude of the sampling signal reflects brightness information of the dimming signal.

Fig. 5D is a schematic circuit diagram of a dimmer according to another embodiment of the present invention. The signal synthesis module 81 in this embodiment includes a power conversion circuit 71 and a signal synthesis processing module 85. The signal synthesizing and processing module 85 is electrically connected to the power conversion circuit 71, and is configured to adjust the voltage of the power supply terminal T1 according to the dimming signal Sdim. Similar to the above embodiments, the output voltage (voltage of the power supply terminal T1) of the power conversion circuit 71 is adjusted according to the dimming signal Sdim, and the present embodiment uses different technical means from the above embodiments.

The signal synthesis processing block 85 includes a transistor M32, diodes D33, D34, and D35. The first pin of the transistor is electrically connected to one end of the inductor L21, the second pin thereof is electrically connected to the second power supply terminal T2, and the third pin thereof is electrically connected to the command conversion module 82. The diodes D33, D34 and D35 are connected in series and then connected in parallel to the first pin and the second pin of the transistor M32.

Referring to fig. 8A, the transistor M32 is controlled by the dimming signal Sdim to be turned on/off, when the dimming signal Sdim is at a low level, the transistor M32 is turned off, the power supply signal output by the power conversion circuit 71 supplies power to the LED lighting device through the first transmission path formed by the diodes D33, D34 and D35, and the voltage of the modulation power Pin _ C is Vset; when the dimming signal Sdim is a high-level signal, the transistor M32 is turned on, the transistors D33, D34 and D35 are bypassed, and the power supply signal output by the power conversion circuit 71 supplies power to the LED lighting apparatus through the second transmission path formed by the transistor M32. The voltage of the modulated power supply Pin _ C is Vset 1. Since the second transmission path has a smaller impedance than the first transmission path, the voltage Vset1> Vset of the modulated power supply Pin _ C formed when the second path is turned on is larger than that of the first transmission path. Correspondingly, a pulse signal with the same frequency and pulse width as the dimming signal Sdim is formed on the modulation power supply Pin _ C.

In other embodiments, the diodes D33, D34, and D35 may be collectively referred to as a voltage divider, and the transistor M32 may be collectively referred to as a control unit.

Fig. 5E is a schematic circuit diagram of a dimmer according to another embodiment of the present invention. The signal synthesis module 81 in this embodiment includes a power conversion circuit 77 and a signal synthesis processing module 86. The signal synthesizing and processing module 86 is electrically connected to the power conversion circuit 77 for adjusting the voltage between the power supply terminals T1 and T2 according to the dimming signal Sdim. The present embodiment is similar to the embodiments shown in fig. 5C and 5D, and the output voltage (voltage of the power supply terminal T1) is adjusted by the signal synthesis processing module, and the technical means used in the present embodiment is different from the above embodiments.

The power conversion circuit 77 is similar in circuit configuration to the power conversion circuit 71 and is also a BUCK-type power conversion circuit, except that the devices in the power conversion circuit 77 are connected in a different manner from the power conversion circuit 71. The power conversion circuit 77 includes a switching control circuit 78, a resistor R24, an inductor L24, a diode D24, a capacitor C24, and a transistor M24. The resistor R24, the inductor L24, the diode D24, the capacitor C24 and the transistor M24 form a conversion circuit 79. The first pin of the transistor M24 is electrically connected to the filter output terminal Ta1/Ta3, the second pin thereof is electrically connected to the cathode of the diode D24 and the first pin of the inductor L24, and the third pin thereof is electrically connected to the switching control circuit 78. The second pin of the inductor L24 is electrically connected to the first power terminal T1. The anode of the diode D24 is electrically connected to the first pin of the resistor R24 and the second power supply terminal T2. Two ends of the capacitor C24 are electrically connected to the power supply terminals T1 and T2, respectively. The second pin of the resistor R24 is electrically connected to the ground GND 1. The operation principle of the power conversion circuit 71 is similar to that of the embodiment shown in fig. 4B, and is not described herein.

The signal synthesis processing block 86 includes a transistor M33 and a resistor R37. The first pin of the transistor is electrically connected to the first pin of the resistor R37, the second pin thereof is electrically connected to the first power supply terminal T1, and the third pin thereof is electrically connected to the command conversion module 82. The second pin of the resistor R37 is electrically connected to the filter output terminal Ta1/Ta 3.

The operation principle of the dimmer of the present embodiment will be described with reference to fig. 8A. The transistor M33 is controlled by the dimming signal Sdim to be turned on/off, and when the dimming signal Sdim is always at a low level, the transistor M33 is turned off, and waveforms of the power supply signal Sp (i.e., the modulation power supply Pin _ C, whose voltage is Vset) output by the power supply output terminals T1 and T2 are as shown in fig. 8A, that is, an output signal after the power conversion is performed by the power conversion circuit 77. When the dimming signal Sdim is at a high level, the transistor M33 is turned on, and the filtered signal is directly output to the power supply terminals T1 and T2 through a path formed by the resistor R37 and the transistor M33, so that the voltage of the obtained modulated power supply Pin _ C is Vset 1. In the present embodiment, since the power conversion circuit 77 is a step-down power conversion circuit, Vset1> Vset. Correspondingly, if the dimming signal is a pulse signal, the signal synthesis processing module 86 modulates the dimming signal to obtain a modulation signal Pin _ C at the power supply terminals T1 and T2, and the waveform of the modulation signal Pin _ C is shown in fig. 8A-8B.

In other embodiments, resistor R37 may be omitted without affecting the intended function of the present embodiment.

Through the above description of the embodiments, those skilled in the art can understand how to implement the modulation power Pin _ C with dimming information outputted by the dimmer. The following further describes how the LED lighting device lights up the light through the modulation power supply Pin _ C and simultaneously demodulates the dimming information from the modulation power supply Pin _ C, and then adjusts the LED control according to the dimming information. With the above-mentioned dimmer, those skilled in the art can understand how to apply the dimming signal to the modulated power source Pin _ C and dim the load using the modulated power source Pin _ C.

Referring to FIG. 1C, a schematic block diagram of an LED lighting system according to further embodiments of the present invention is shown. The LED lighting system 100 includes a dimmer 80 and an LED lamp 100. The dimmer 80 is connected between the power input a1 and the LED lamp 100 to convert the set dimming information into a dimming signal and apply the dimming signal to the power signal to generate a dimming power signal. The LED lamp 100 includes a plurality of lamps such as the LED lamp 100_1 and the LED lamp 100_2, and the LED lamp 100 receives the dimming power signal output by the dimmer 80, demodulates the dimming signal included in the dimming power signal, and adjusts the brightness or color of the LED lamp according to the dimming signal. The LED lamps 100_1 and 100_2 … 100_ n (n is a positive integer greater than or equal to 1) can simultaneously receive the dimming power signal output by the dimmer 80, and adjust the brightness or color of the LED lamps, thereby achieving the purpose of simultaneously adjusting a plurality of lamps by one dimmer. In this embodiment, 120-1 and 100_2 … 100_ n are LED lamps with the same or similar configuration. In other embodiments, the dimming power signal may also be referred to as a modulated power supply.

In this embodiment, one end of the light modulator 80 is electrically connected to the power input end a1, and the other end is connected to the LED lamp. With this configuration, the purpose of dimming using a single power line (also referred to as single hot line dimming) can be achieved. Since conventional wall switches are also typically connected in series between the power input a1 and the LED lamp, the dimmer 80 can be used to directly replace conventional wall switches to upgrade existing lighting systems without having to relocate the power lines. The configuration mode of the embodiment can be used for conveniently upgrading the lighting system and reducing the installation cost.

In this embodiment, the LED lamp 100 may be any LED lamp using external power for power supply, for example, a straight LED lamp, a down LED lamp, or a ceiling LED lamp.

Fig. 8I is a schematic waveform diagram of a dimming power signal of an LED lighting system according to an embodiment of the invention. An ac half-wave is divided into 3 phases. The supply phase t1 is used for the control unit supply. The power stage t2 is used to power the LED lamp, illuminating the LED lamp. The data phase t3 is used to load the dimming signal onto the power signal to generate the dimming power signal.

Fig. 5F is a schematic circuit block diagram of a dimmer according to another embodiment of the present invention. Dimmer 80 comprises zero-crossing detection module 801, data modulation module 802, power supply module 803, control module 804, dimming signal generation module 805, filter circuit 806, and diode 807. The zero-cross detection module 801 is electrically connected to the power input terminal a1, the dimmer output terminal 80a, and the control module 804, respectively. The zero-crossing detection module 801 collects power signals from the power input terminal a1 and the dimmer output terminal 80a, and generates a zero-crossing signal and transmits the zero-crossing signal to the control module 804 when a waveform is converted from a positive half cycle to a negative half cycle or from the negative half cycle to a positive half cycle and passes through a zero potential. The data modulation module 802 is electrically connected to the power input a1, the dimmer output 80a, the control module 804, and the anode of the diode 807, respectively. The data modulation module 802 is controlled by the control module 804 to apply the dimming signal Sdim to the power signal, generate a dimming power signal, and transmit the dimming power signal to the rear load through the dimmer output 80 a. The power supply module 803 is respectively connected to the filter circuit 806 and the control module 804. The power supply module 803 performs a power conversion on the received power signal to generate a power supply signal for the light modulator 80 to use. The dimming signal generation module 805 is electrically connected to the control module 804. The dimming signal generation module 805 is configured to convert the setting dimming command DIM into a dimming signal Sdim, and send the dimming signal Sdim to the control module 804. The control module 804 receives the dimming signal Sdim of the dimming signal generation module 805, and loads the dimming signal Sdim onto the power signal through the data modulation module 802 to generate a dimming power signal. The control module 804 receives the zero crossing signal from the zero crossing detection module 801 and starts the data modulation action at a specific time after receiving the zero crossing signal. The filter circuit 806 is electrically connected to the data modulation module 802 through the diode 807, receives the power signal processed by the data debugging module 802, filters the power signal, generates a filtered signal, and transmits the filtered signal to the power supply module 803. The cathode of the diode 807 is electrically connected to the filter circuit 806 for preventing the current of the filter circuit 806 from flowing into the data modulation module 802 and causing interference to the data modulation module 802.

The control module 804 is electrically connected to the circuit node REFD, which serves as a reference potential node in the circuit.

In other embodiments, the dimming signal generation module 805 may include a wireless remote control and a signal receiving module. The wireless remote control module is used for converting a dimming instruction DIM set by a user into a wireless dimming signal and sending the wireless dimming signal to the signal receiving module, the signal receiving module receives the wireless dimming signal and converts the wireless dimming signal into a dimming signal Sdim, and the dimming signal Sdim contains set dimming information. In some embodiments, the dimming signal generation module may also be referred to as a command conversion module.

In some embodiments, the dimming signal generation module 805 may further include a light sensing module (not shown). The light sensing module is used for receiving ambient light and generating a dimming signal Ssim according to the intensity of the ambient light, so that the function of automatically adjusting the brightness of the LED lamp according to the ambient light is realized.

Fig. 11A is a schematic circuit diagram of a zero-crossing detection module according to an embodiment of the invention. The zero-crossing detection module 801 includes

resistors

8011, 8012, 8015 and 8016,

capacitors

8013 and 8017, and

zener diodes

8014 and 8018. A first lead of resistor 8011 is electrically coupled to power input a1, and a second lead of resistor 8011 is electrically coupled to a first lead of resistor 8012. A second terminal of resistor 8012 is electrically coupled to circuit node REFD. Capacitor 8013 is connected in parallel with resistor 8012. The anode of the zener diode 8014 is electrically connected to the circuit node REFD, the cathode thereof is electrically connected to the zero-crossing detection module output 801a, and the zero-crossing detection module output 801a is electrically connected to the control module 804. The components of zero-cross detection module 801 between dimmer output 80a and zero-cross detection module output 801b are configured similarly to those at power input a1 and zero-cross detection module output 801a, with a first leg of resistor 8015 electrically coupled to dimmer output 80a, and a second leg of resistor 8015 electrically coupled to a first leg of resistor 8016. A second terminal of resistor 8016 is electrically coupled to circuit node REFD. Capacitor 8017 is connected in parallel with resistor 8016. The anode of zener diode 8018 is electrically connected to circuit node REFD, the cathode thereof is electrically connected to the output terminal 801b of the zero-crossing detection module, and the output terminal 801b of the zero-crossing detection module is electrically connected to the control module 804.

The operation principle of the zero-crossing detection module 801 is described below with reference to fig. 11A. Because of the series voltage division of

resistors

8011 and 8012, the voltage across resistor 8012 is proportional to the voltage between power input a1 and reference potential point REFD. Capacitor 8013 stabilizes the voltage across resistor 8012. Zener diode 8014 is configured to limit the maximum voltage across resistor 8012 to a predetermined value. Zero crossing detection module output 801a is configured to transmit the voltage signal at resistor 8012 to control module 804. In a similar manner to the configuration between power input a1 and zero crossing detection circuit output 801a, zero crossing detection module output 801b also communicates the voltage at resistor 8016 to control module 804. Inside the control module, the output 801a of the zero-crossing detection module is electrically connected to the positive input terminal of a comparator, and the output 801b of the zero-crossing detection module is electrically connected to the negative input terminal of the comparator. In other embodiments, the comparator may be disposed outside of the control module 804. When the waveform at the power input terminal a1 is switched from negative half cycle to positive half cycle, the potential at the zero-cross detection circuit output terminal 801a is higher than the potential at 801b, and the comparator outputs a high level signal. When the potential of the zero-cross detection circuit output terminal 801a is lower than the potential at 801b when the waveform at the power input terminal a1 transitions from the positive half cycle to the negative half cycle, the comparator outputs a low level signal. The control module 804 determines the zero crossing by detecting a change in the level at the output of the comparator.

Fig. 11B is a circuit diagram of a data modulation module according to an embodiment of the invention. The data modulation module 802 includes

diodes

8021, 8022 and 807, a zener diode 8023, and

MOS transistors

8024, 8025 and 8026. The anode of the diode 8021 is electrically connected to the power input a1 and the first pin of the MOS transistor 8024. The cathode of the diode 8021, the cathode of the diode 8022, and the cathode of the zener diode 8023 are electrically connected to and connected to the anode of the diode 807. The cathode of the diode 807 is electrically connected to the filter circuit. The anode of the diode 8022 is electrically connected to the first pin of the MOS transistor 8025. The anode of the zener diode 8023 is electrically connected to the first pin of the MOS transistor 8026. A second pin of the MOS transistor 8024 is electrically connected to a second pin of the MOS transistor 8025 and to the circuit node REFD. The third pin of the MOS transistor 8024, the third pin of the MOS transistor 8025, and the second pin of the MOS transistor 8026 are electrically connected to the control module 804.

The action of the data modulation module 802 at various circuit stages is described below in conjunction with fig. 8I.

In the power supply stage t1, the data modulation module 802 may be used as a rectifying circuit to rectify the received external power signal to generate a rectified signal, and the filtering circuit 806 receives the rectified signal and then filters the rectified signal. The following describes the operation principle of the data modulation module 802 as a rectifier circuit. In the data phase, the MOS transistor 8024 and the MOS transistor 8025 do not receive the enable signal and are in a disconnected state, the body diodes of the MOS transistor 8024 and the MOS transistor 8025, the diode 8021 and the diode 8022 form a full-bridge rectification circuit together, and the received power signal is rectified to obtain a rectified signal. The anode of the body diode of MOS transistor 8024 is electrically connected to circuit node REFD, and the cathode is electrically connected to the anode of diode 8021. Similarly, the anode of the body diode of MOS transistor 8025 is electrically connected to circuit node REFD, and the cathode is electrically connected to the anode of diode 8022.

In the power stage t2, the third pin of the MOS transistor 8024 and the third pin of the MOS transistor 8025 receive the enable signal of the control module 804, the MOS transistor 8024 and the MOS transistor 8025 are closed and conducted, and the external power signal may be directly transmitted to the LED lamp 100 through a loop formed by the power signal input end a1, the MOS transistor 8024, the MOS transistor 8025, and the dimmer output end 80 a.

In the data phase t3, the data modulation module 802 acts as a modulation circuit to load the dimming signal Sdim onto the power line. The control module 804 controls the MOS transistor 8026 to be turned on intermittently, and the dimming signal can be loaded on the power signal to generate the dimming power signal by matching the actions of the MOS transistor 8024 and the MOS transistor 8025, referring to the signal waveform in the data phase of fig. 8I. In this embodiment, each half-wave carries a set of data, and the set of data includes at least one digital signal. One pulse of the data phase t3 on the waveform corresponds to one digital signal. The dimming data can be combined by combining a plurality of digital signals. The dimming data is a digital signal and can carry brightness and color information or other dimming information.

By using the circuit characteristics of the MOS transistors in the data modulation module 802, the data modulation module 802 can implement different circuit functions at different circuit stages. In a power supply stage t1, the

MOS transistors

8024 and 8025 in the data modulation module 802 are in an off state, and the body diodes of the

MOS transistors

8024 and 8025 and the

diodes

8021 and 8022 form a full-bridge rectifier circuit to rectify a received power signal to generate a rectified signal; in the power phase t2, the

MOS transistors

8024 and 8025 in the data modulation module 802 are in a conducting state, and the external power signal can directly supply power to the LED lamp 100 through a power supply circuit formed by the power input terminal a1, the

MOS transistors

8024 and 8025, and the dimmer output terminal 80 a; in the data phase t3, the

MOS transistors

8024 and 8025 in the data modulation module 802 work in the amplification region, and the MOS transistor 8026 is driven to be turned on intermittently, so that a pulse signal can be generated on the power signal (refer to fig. 8I). The pulse width of the pulse signal corresponds to the on-time of the MOS transistor 8026. The digital signal can be loaded onto the power signal by characterizing 1 s and 0 s of the digital signal with the characteristics of the pulse signal. The characteristics of the pulse signal are, for example, but not limited to, the width of the pulse signal, the amplitude of the pulse signal, and the like.

Through the configuration mode, the data modulation module 802 can act in the power supply stage t1, the power stage t2 and the data stage t3 respectively, so that multiple circuit functions can be realized through one circuit configuration, the circuit structure can be greatly simplified, and the cost is saved.

In other embodiments, the data modulation module 802 may only operate in one or both of the power phase t1, the power phase t2, and the data phase t 3.

Fig. 12C is a schematic circuit diagram of a filter circuit according to an embodiment of the invention. In this embodiment, the filter circuit FC1 includes a capacitor C1, a first pin of the capacitor C1 is electrically connected to the terminal C1 and the terminal d1, and a second pin of the capacitor C1 is electrically connected to the terminal C2 and the terminal d 2.

Fig. 12D is a schematic circuit diagram of a filter circuit according to another embodiment of the invention. In this embodiment, the filter circuit FC2 includes capacitors C2 and C3 and an inductor L1. The first pin of inductor L1 is electrically connected to terminal c1, and the second pin thereof is electrically connected to terminal d 1. Capacitor C2 is electrically connected to terminals C1 and C2, respectively, and capacitor C3 is electrically connected to terminals d1 and d2, respectively. The filter circuit FC2 is a pi filter circuit, and generates a filter signal after filtering a received circuit signal.

The filter circuit 806 in the dimmer 80 may employ the filter circuit FC1 or FC2 in fig. 12C or 12D. Further, terminal c1 is electrically connected to the cathode of diode 807, terminal c2 is electrically connected to circuit node FEFD, and terminals d1 and d2 are electrically connected to power supply module 803, respectively.

In this embodiment, the filter circuit FC1 or FC2 filters the received power signal, and generates a filtered signal to be used by the power supply module 803.

In other embodiments, the filter circuit 806 may adopt other forms of filter circuit structures, and the invention is not limited thereto.

The power supply module 803 of the light modulator 80 may adopt the circuit structure of the power conversion circuit 71 shown in fig. 4A, and further, an input terminal of the power conversion circuit 71 is electrically connected to the filter circuit 806 for receiving the filtered signal and performing power conversion, so as to convert the received filtered signal into a stable power supply module output signal.

In this embodiment, the power supply module 803 may adopt the step-down dc-to-dc conversion circuit described in fig. 4B to perform step-down conversion on the received filtered signal, and the working principle thereof refers to the description related to fig. 4B, and is not described herein again. In this embodiment, the power supply module 803 may adopt any one of a buck circuit, a boost circuit, and a boost-buck circuit according to a specific application.

Fig. 12E is a schematic circuit diagram of the dimming signal generation module according to an embodiment of the invention. The dimming signal generation module 805 includes a variable resistor 8051, a resistor 8052, and a capacitor 8053. A first pin of the variable resistor 8051 is electrically connected to a voltage source V1, a second pin of the variable resistor 8051 is connected to the circuit node REFD, and a third pin of the variable resistor 8051 is connected to a first pin of the resistor 8052. The capacitor 8053 has a first lead electrically connected to a second lead of the resistor 8052, and a second lead electrically connected to the circuit node REFD. The output terminal 805a of the dimming signal generation module 805 is electrically connected to the second pin of the resistor 8052. The voltage source V1 is used to provide a constant voltage. By changing the position of the third pin of the slide rheostat 8051, the voltage of the third pin relative to the circuit node REFD can range from 0 to V1, and the voltage change from 0 to V1 corresponds to different brightness of the LED lamp. The voltage signal corresponding to the third pin of the resistor 8051 is the dimming signal Sdim. The output terminal 805a of the dimming signal generation module 805 is electrically connected to the control module 804, and transmits the dimming signal Sdim to the control module 804.

In other embodiments, the dimming signal generation module 805 may include a wireless remote control and a signal receiving module. The wireless remote control module is used for converting user-set dimming information into a wireless dimming signal and sending the wireless dimming signal to the signal receiving module, the signal receiving module receives the wireless dimming signal and converts the wireless dimming signal into a dimming signal Sdim, and the dimming signal Sdim contains set brightness or color information.

In some embodiments, the dimming signal generation module 805 may further include a light sensing module. The light sensing module is used for receiving ambient light and generating a dimming signal Ssim according to the intensity of the ambient light. Therefore, the function of automatically adjusting the brightness or the color of the LED lamp according to the ambient light is realized.

In this application, the LED lamp 100 may be referred to as an LED lighting device in other embodiments. The LED lamp 100 may employ the circuit architecture of fig. 6A-6B. In contrast, in the present embodiment, the LED lamp 100 is electrically connected to the dimmer output terminal 80a and the power input terminal a2, that is, the first connection terminal 101 is electrically connected to the dimmer output terminal 80a, and the second connection terminal 102 is electrically connected to the power input terminal a2, for receiving the dimming power signal outputted by the dimmer and demodulating the dimming information therein for dimming.

Fig. 1F is a schematic diagram of functional modules of an LED lighting system according to another embodiment of the present invention. The LED lighting system 10 further includes a sensor 30. The sensor 30 is electrically connected to the dimmer 80 and the LED lamp 100 for turning on and off the power supply circuit according to the environment variable. The power supply loop is a current path formed by an external power signal through the power input terminal a1, the dimmer 80, the LED lamp 100 and the power input terminal a 2. The environment variable in this embodiment may be whether human body activity is detected or not, the intensity of ambient light, and the like. When human activity is detected, for example, the sensor 30 switches on the power supply circuit to light the LED lamp; when no human activity is detected, the sensor 30 disconnects the power supply circuit to turn off the LED lamp. With such an arrangement, the LED lighting system 10 can determine whether to light the LED lamp by detecting the movement of the human body, and light the LED lamp only when the human body moves, thereby saving resources and reducing waste.

Fig. 22A is a schematic circuit diagram of a sensor according to an embodiment of the invention. The sensor 30 includes a sensor power module 301, a sensor control module 302, and a switching device 303. The sensor power supply module 301 is electrically connected to the dimmer 80 and the power input terminal a 2. The switching device 303 is electrically connected to the dimmer 80 and the LED lamp 100, i.e., connected to the power supply loop. The sensor control module 302 is electrically connected to the sensor power supply module 301 and the switching device 303. The sensor power supply module 301 is configured to receive the dimming power signal output by the dimmer 80 and perform power conversion to generate a low-voltage dc power signal that can be used by the sensor control module 302. The sensor control module 302 is configured to process the environmental variable and generate a control signal to control the switching of the switching device 303.

Fig. 22B is a schematic circuit diagram of a sensor power supply module according to an embodiment of the invention. The sensor power supply module 301 includes

capacitors

3011 and 3013, a full-bridge rectifier circuit 3012, and a zener diode 3014. The capacitor 3011 has a first pin electrically connected to the output terminal of the dimmer 80 and a second pin electrically connected to the input terminal of the full-bridge rectifier circuit 3012. The power input terminal a2 is electrically connected to an input terminal of the full-bridge rectifier circuit 3012. The capacitor 3013 and the zener diode 3014 are connected in parallel and electrically connected to the output terminal of the full-bridge rectifier circuit 3012. The sensor control module 302 is electrically connected to two ends of the zener diode 3014. In this embodiment, the sensor power supply circuit 131 is a resistance-capacitance voltage reduction circuit, and reduces the voltage of the received dimming power signal for the sensor control module 302 to use. In other embodiments, a resistor (not shown) is connected in parallel between two ends of the capacitor 3011 to discharge energy of the capacitor 3011, so as to increase stability of the system.

In this embodiment, when the switching device 303 is closed, the circuit configuration of fig. 22B may be equivalent to the circuit configuration described in fig. 22C. Referring to fig. 22C, the sensor 30 includes a capacitor C30 and a resistor R30. The capacitor C30 and the resistor R30 are connected in series and then connected in parallel with the LED lamp 100.

Referring to fig. 22C and fig. 8I, the dimming power signal is a signal output by the dimmer 80, the sensor 30 and the LED lamp 100 are connected in parallel and electrically connected to the dimmer 80, and the circuit characteristic of the sensor 30 affects the dimming power signal. The sensor 30 includes a capacitor C30, the capacitor C30 filters the received signal, the waveform of the dimming power signal is changed after the data phase t3 including the dimming information is filtered by the capacitor C30, and when the waveform deformation exceeds a certain degree, the LED lamp cannot identify the dimming information in the dimming power signal, so that dimming cannot be performed, and the whole dimming system fails.

Fig. 22D is a schematic circuit diagram of a sensor according to another embodiment of the invention. The sensor 30 includes a rectifying circuit 306, a filtering circuit 304, a power conversion circuit 305, a sensor control module 302, and a switching device 303. The rectifying circuit 306 is electrically connected to the dimmer 80 and the power input a 2. The filter circuit 304 is electrically connected to the rectifying circuit 306. The power conversion circuit is electrically connected to the filter circuit 304. The sensor control module 302 is electrically connected to the power conversion circuit 305 and the control pin of the switching device 303. The first pin of the switching device 303 is electrically connected to the output terminal of the dimmer 80, and the second pin thereof is electrically connected to the LED lamp. The rectifying circuit 306 is configured to rectify the received dimming power signal to generate a dc signal. The filter circuit 304 is configured to receive the rectified dc signal and filter the received rectified dc signal to generate a smoothed dc signal. The power conversion circuit 305 is used for performing power conversion on the smoothed dc signal to generate a low-voltage dc signal for the sensor control module 302. The sensor control module 302 is configured to process the environmental variable and generate a control signal to control the switching of the switching device 303.

The rectifying circuit 306 in this embodiment may adopt the circuit architecture of fig. 12A or 12B, which is not described herein. The filter circuit 304 in this embodiment may adopt the circuit structure of the filter circuit described in fig. 12C or 12D, which is not limited in this disclosure. The specific configuration of the power conversion circuit 305 of this embodiment can refer to the circuit structures in fig. 4A and fig. 4B, and will not be repeated herein.

The circuit structure of the sensor 30 in the embodiment is similar to that of the sensor 30 in the embodiment shown in fig. 22A, except that the sensor 30 is powered by the circuit structure of the resistor-capacitor voltage reduction used by the sensor power supply module 301 in the embodiment shown in fig. 22A, and the sensor 30 is powered by the circuit structure of the rectifier filter and the power conversion in the embodiment. As described in the foregoing embodiments, the circuit structure of the rc step-down circuit may affect the dimming power signal, so that the dimming system cannot be used normally. In this embodiment, the rectifying circuit 306 is used to isolate the circuit, and capacitive devices included in the circuit (including the filter circuit 304, the power conversion circuit 305, and the sensor control module 302) after the rectifying circuit 306 do not interfere with the dimming power signal, so that the dimming power signal can be normally identified by the LED lamp for dimming.

In particular, there are many possible embodiments for implementing dimming control by adjusting the signal characteristics of the input power Pin. In a conventional embodiment, the magnitude of the driving power Sdrv is adjusted by adjusting the conduction angle of the input power Pin to adjust the effective value (RMS) of the input power Pin.

The conventional dimming control method and the corresponding circuit operation are described below with reference to fig. 1A and 8C, wherein fig. 8C is a schematic diagram of the dimming waveform of an LED lighting system. Referring to fig. 1A and 8C, in the present embodiment, the external power grid EP is illustrated by providing an ac power as the input power Pin, and the half-cycle voltage waveform of the input power Pin with amplitude VPK is illustrated in fig. 8C as an example. In fig. 8C, voltage waveforms WF1, WF2, and WF3 in three different dimming control modes, i.e., the light emission luminance Lux is the maximum luminance Lmax, the light emission luminance Lux is 50% of the maximum luminance Lmax, and the light emission luminance Lux is 17% of the maximum luminance Lmax, in this order from top to bottom. The dimmer 80 can adjust the phase-cut angle/conduction angle of the input power Pin by controlling the on/off state of the controllable electronic components connected in series to the bus. For example, if the input power Pin is modulated with a 90 degree phase-cut angle, the dimmer 80 may turn off the controllable electronic element during 1/4 cycles of the input power Pin and maintain the controllable electronic element on for the rest of the half-cycle. This makes the voltage waveform of the input power Pin zero during the phase 0 to 90 degrees, and reforms the sine wave waveform during the phase 90 to 180 degrees (the edge tangent is used as an example, but not limited thereto). The input power supply Pin after being tangent is the input power supply Pin _ C with a conduction angle of 90 degrees. The principle of modulating the input power Pin by other phase-cut angles is similar to that described above.

First, as seen from the voltage waveform WF1, when the dimmer 80 modulates the input power Pin with a phase-cut angle of 0 degrees (i.e., the conduction angle of the input power Pin is 180 degrees) in response to the dimming signal Sdim, the dimmer 80 directly provides the input power Pin to the LED lighting apparatus 100, i.e., the input power Pin is equal to the input power Pin _ C. In this case, the effective value of the input power Pin _ C is Vrms1, and the power module PM generates a corresponding driving power Sdrv to drive the LED module LM based on the input power Pin _ C with the effective value of Vrms1, so that the light emitting brightness Lux of the LED module LM is the highest brightness Lmax.

When the dimmer 80 modulates the input power Pin with a phase-cut angle of 90 degrees (i.e., the conduction angle of the input power Pin is 90 degrees) in response to the dimming signal Sdim, the dimmer 80 disconnects the bus during the phase of the input power Pin is 0 to 90 degrees and conducts the bus during the phase of 90 to 180 degrees, as seen from the voltage waveform WF 2. In this case, the effective value of the input power supply Pin _ C is Vrms2, where Vrms2 is smaller than Vrms1, and the light emission luminance Lux is made equal to 50% of the maximum luminance Lmax.

When the dimmer 80 modulates the input power Pin with a phase-cut angle of 90 degrees (i.e., the conduction angle of the input power Pin is 30 degrees) in response to the dimming signal, the dimmer 80 disconnects the bus during the phase of the input power Pin is 0 to 150 degrees, and conducts the bus during the phase of 150 to 180 degrees, as seen from the voltage waveform WF 3. In this case, the effective value of the input power supply Pin _ C is Vrms3, where Vrms3 is smaller than Vrms2, and the light emission luminance Lux is made equal to 17% of the maximum luminance Lmax.

According to the dimming control method, the dimmer 80 modulates the phase-cut angle/conduction angle of the input power Pin to generate a corresponding change in the effective value (e.g., Vrms1, Vrms2, Vrms3) of the input power Pin _ C, wherein the change in the effective value of the input power Pin _ C is substantially positively correlated with the change in the conduction angle of the input power Pin _ C, i.e., the larger the conduction angle of the input power Pin _ C, the larger the effective value of the input power Pin _ C. In other words, the effective value of the input power Pin _ C changes substantially in negative correlation with the phase-cut angle of the input power Pin _ C. In general, the conventional dimming control method described above actually implements the dimming function by modulating the effective value of the input power. The advantage of this dimming manner is that the driving power Sdrv directly reflects the effective value of the input power Pin _ C and changes accordingly, so that the LED lighting device 100 does not need to change the hardware configuration, and only the dimmer 80 is added to the system to realize the dimming function.

More specifically, in this dimming mode, in order to make the effective value of the input power Pin have a variation with a sufficient amplitude so as to make the light emitting brightness have a corresponding change with a large amplitude, when the dimmer 80 controls the phase-cut angle/conduction angle to modulate the effective value of the input power Pin, a large phase adjustment range is also required, for example, the dimming is usually performed between the phase 0 degree and 180 degrees. However, when the conduction angle of the modulated power supply Pin _ C is small to a certain degree, the characteristics of the Power Factor (PF) and The Harmonic Distortion (THD) of the power module PM are significantly affected, so that the power conversion efficiency is greatly reduced, and the problem of flickering of the LED module LM may be caused. In other words, under such a dimming manner, the efficiency of the power module PM is limited by the dimmer 80 and is difficult to be improved.

On the other hand, the effective value of the modulated power supply Pin _ C is subjected to the amplitude V_PKThe direct effect of the size is that the dimmer 80 employing the above dimming method cannot be compatibly applied in various environments with different grid voltage specifications (e.g., 120V, 230V, or 277V ac voltages). The designer needs to adjust the parameters or hardware design of the light modulator 80 according to the application environment of the LED lighting system 10, and thusThe overall production cost of the product is improved.

In view of the above problems, the present disclosure provides a new dimming control method, and an LED lighting system and an LED lighting device using the same, which can use the phase-cut angle/conduction angle variation of the input power Pin as a modulation signal, obtain actual dimming information by demodulating the modulation signal, and accordingly control the power module PM to generate the circuit operation of the driving power Sdrv. Since the phase-cut angle/conduction angle is changed only for carrying the dimming information corresponding to the dimming signal DIM, and not for directly adjusting the effective value of the modulation power Pin _ C, the dimmer 80 can adjust the phase-cut angle/conduction angle of the input power Pin in a smaller phase interval, so that the effective value of the processed modulation power Pin _ C does not have a large difference from the input power Pin provided by the external power grid EP. By this way, no matter under any brightness state, the conduction angle of the modulated power supply Pin _ C is similar to that of the input power supply Pin, so that the THD and PF characteristics can be maintained. This means that the conversion efficiency of the power module PM is not suppressed by the dimmer 80. The dimming control method and the structure and operation of the LED lighting device taught by the present disclosure are further described below.

Referring to fig. 6A and fig. 8D to fig. 8G, in the present embodiment, the dimmer may modulate the phase-cut angle of the input power Pin, for example, within the dimming phase interval D _ ITV. Fig. 8D shows, in order from top to bottom, a voltage waveform WF4 of the dimming phase section D _ ITV, a voltage waveform WF5 when the light emission luminance Lux is the maximum luminance Lmax, and a voltage waveform WF6 when the light emission luminance Lux is the minimum luminance Lmin.

First, as seen from the voltage waveform WF4, the dimming phase interval D _ ITV is composed of a phase interval between a lower phase-cut angle C1 and an upper phase-cut angle C2, and the lower phase-cut angle C1 may be any value in an interval from 0 degrees to 15 degrees (e.g., 1, 2, 3 …, etc.), but the disclosure is not limited thereto. In addition, the upper phase cut angle C2 may be any value within the range of 20 degrees to 45 degrees (e.g., 21, 22, 23 …, and so on), but the disclosure is not limited thereto. In other words, the dimming phase interval D _ ITV may be, for example, a phase interval of 0 degree to 45 degrees, a phase interval of 5 degrees to 20 degrees, a phase interval of 15 degrees to 20 degrees, or a phase interval of 15 degrees to 45 degrees, which may be selected according to design requirements. In the present disclosure, the upper tangent angle C2 is selected based on two principles: firstly, the width of the dimming phase interval D _ ITV can have sufficient resolution in mapping; second, when the dimmer adjusts the phase-cut angle of the modulated power Pin _ C to the upper limit phase-cut angle C2, the THD and PF characteristics of the power module PM can be maintained (e.g., not lower than 80% of the THD and PF when the dimmer adjusts the lower limit phase-cut angle C1, preferably, the THD is less than 25% and/or the PF is greater than 0.9). When the dimmer 80 modulates the input power Pin at the phase-cut angle C1 (i.e., the conduction angle of the input power Pin is 180-C1 degrees) in response to the dimming signal Sdim, the dimmer 80 disconnects the bus during the phase of the input power Pin is 0 degrees to C1 and turns on the bus during the phase of the input power Pin is C1 to 180 degrees from the voltage waveform WF 5. In this case, the demodulation module 240 generates the dimming control signal Sdc indicating to adjust the light emitting brightness Lux to the maximum brightness Lmax according to the modulation power Pin _ C with the phase cut angle C1. The switching control circuit 331 uses the dimming control signal Sdc as a reference for controlling the switching of the power switch PSW, so that the conversion circuit 132 generates a corresponding driving power Sdrv to drive the LED module LM, and maintain the luminance Lux of the LED module LM at the highest luminance Lmax.

When the dimmer 80 modulates the input power Pin at the phase-cut angle C2 (i.e., the conduction angle of the input power Pin is 180-C2 degrees) in response to the dimming signal, the dimmer 80 disconnects the bus during the phase of the input power Pin is 0 degrees to C2, and turns on the bus during the phase of the input power Pin is 150 degrees to 180 degrees, as seen from the voltage waveform WF 6. In this case, the demodulation module 140 generates the dimming control signal Sdc indicating to adjust the light emitting brightness Lux to the minimum brightness Lmin according to the modulation power Pin _ C with the phase cut angle C2. The switching control circuit 331 uses the dimming control signal Sdc as a reference for controlling the switching of the power switch PSW, so that the conversion circuit 132 generates a corresponding driving power Sdrv to drive the LED module LM, and the light emitting brightness Lux of the LED module LM is reduced to the minimum brightness Lmin. In the present embodiment, the lowest luminance Lmin may be, for example, 10% of the highest luminance Lmax.

Although the present embodiment also implements dimming control by adjusting the phase-cut angle/conduction angle, since the phase-cut angle/conduction angle change of the power supply Pin _ C is only used as a reference signal for indicating dimming information in the present embodiment, rather than making the effective value change of the power supply Pin _ C directly reflected on the light-emitting brightness change, under the dimming control method of the present embodiment, the selected dimming phase interval D _ ITV is significantly smaller than that under the dimming control method of fig. 8C. In another aspect, under the dimming control method of the present embodiment, no matter whether the dimmer modulates the input power Pin by using any phase-cut angle within the dimming phase interval, the generated effective value of the modulated power Pin _ C is not much different. For example, in some embodiments, the effective value of the modulated power Pin _ C generated by modulation based on the upper phase cut angle C2 (e.g., the effective value under the voltage waveform WF 6) is not more than 50% lower than the effective value of the modulated power Pin _ C generated by modulation based on the lower phase cut angle C1 (e.g., the effective value under the voltage waveform WF 5).

From another perspective, in the foregoing general conventional embodiment, since the brightness of the LED module is modulated and then directly related to the effective value of the modulation power Pin _ C, in the general conventional embodiment, the effective value range ratio of the modulation power Pin _ C is substantially the same as the brightness range ratio of the LED module. The effective value range ratio is defined as a ratio of a maximum value to a minimum value of an effective value of the modulation power supply Pin _ C, and the brightness range ratio is defined as a ratio of a maximum value to a minimum value of the brightness of the LED module. In contrast, according to the present disclosure, as mentioned above, the ratio of the effective value range of the modulated power Pin _ C may not be related to the ratio of the brightness range of the LED module, in some preferred embodiments, the ratio of the effective value range of the modulated power Pin _ C may be smaller than the ratio of the brightness range of the LED module, in some preferred embodiments, the ratio of the effective value range of the modulated input power Pin _ C is smaller than or equal to 2, and the ratio of the brightness range of the LED module is greater than or equal to 10.

It should be noted that the correlation between the luminance Lux of the LED module LM and the change of the phase-cut angle is only an example and not a limitation, for example, in other embodiments, the luminance of the LED module LM may be negatively correlated to the phase-cut angle of the modulation power Pin _ C.

Referring to fig. 8E, in the present embodiment, as seen from the voltage waveform WF7, when the dimmer 80 modulates the input power Pin at the phase-cut angle C1 in response to the dimming signal Sdim (i.e., the conduction angle of the input power Pin is 180-C1 degrees), the dimmer 80 disconnects the bus during the period when the phase of the input power Pin is 0 degrees to C1 degrees, and turns on the bus during the period when the phase is C1 to 180 degrees. In this case, the demodulation module 140 generates the dimming control signal Sdc indicating to adjust the light emitting brightness Lux to the minimum brightness Lmin according to the modulation power Pin _ C with the phase cut angle C1. The switching control circuit 131 uses the dimming control signal Sdc as a reference for controlling the switching of the power switch PSW, so that the conversion circuit 132 generates a corresponding driving power Sdrv to drive the LED module LM, and maintain the luminance Lux of the LED module LM at the minimum luminance Lmin.

When the dimmer 80 modulates the input power Pin at the phase-cut angle C2 (i.e., the conduction angle of the input power Pin is 180-C2 degrees) in response to the dimming signal, the dimmer 80 disconnects the bus during the phase of the input power Pin is 0 degrees to C2, and turns on the bus during the phase of the input power Pin is 150 degrees to 180 degrees, as seen from the voltage waveform WF 8. In this case, the demodulation module 140 generates the dimming control signal Sdc indicating to adjust the light emitting brightness Lux to the maximum brightness Lmax according to the modulation power Pin _ C with the phase cut angle C2. The switching control circuit 131 uses the dimming control signal Sdc as a reference for controlling the switching of the power switch PSW, so that the conversion circuit 132 generates a corresponding driving power Sdrv to drive the LED module LM, and the light emitting brightness Lux of the LED module LM is reduced to the maximum brightness Lmax. Incidentally, in the embodiment of fig. 8D and 8E, the tangent angle C2 is greater than the tangent angle C1.

Fig. 8F and 8G are used to further illustrate specific circuit operations and signal generation mechanisms of the demodulation module 240 in different embodiments. Fig. 8F and 8G are schematic diagrams illustrating a corresponding relationship between a phase-cutting angle, a demodulation signal and a brightness of an LED module according to different embodiments of the disclosure.

Referring to fig. 6A, fig. 8F and fig. 8G, the demodulation circuit 140 of the present embodiment adopts a signal processing means similar to an analog circuit to capture and convert the dimming information. As can be seen from fig. 8F, when the phase-cut angle ANG _ pc of the modulated power Pin _ C is adjusted in the interval between C1 and C2, the level of the dimming control signal Sdc correspondingly changes in the interval between V1 and V2. In other words, the phase-cut angle ANG _ pc of the modulated power supply Pin _ C is in a linear relationship with the level of the dimming control signal Sdc in the dimming phase interval. From the operation perspective of the demodulation module 140, when the demodulation module 140 determines that the phase cut angle of the modulation power Pin _ C is C1, it correspondingly generates the dimming control signal Sdc with the level V1; similarly, when the demodulation module 140 determines that the phase cut angle of the modulation power Pin _ C is C2, it correspondingly generates the dimming control signal Sdc with the level D2.

Then, the dimming control signal Sdc positively correlated to the phase-cut angle ANG _ pc is provided to the switching control circuit 131, so that the conversion circuit 132 generates a corresponding driving power Sdrv to drive the LED module LM, and the LED module LM has a corresponding light-emitting brightness Lux. In some embodiments, the light emitting brightness Lux of the LED module LM has a linear relationship with a negative correlation with the level of the dimming control signal Sdc. As shown in fig. 8F, when the dimming control signal Sdc received by the switching control circuit 131 is at the level Va between the level V1 and the level V2, the switching control circuit 331 adjusts the lighting control signal Slc accordingly, so that the LED module LM is driven by the driving power Sdrv to emit light at the brightness La. Wherein the brightness La is inversely proportional to the level Va and can be used

It is shown, but the disclosure is not limited thereto.

It should be noted that the above mechanisms for generating the dimming control signal Sdc and the light-emitting brightness Lux are only for describing an embodiment of the present disclosure in which the demodulation module 140 extracts and converts/maps the signal characteristics (such as the phase cut angle) of the modulation power Pin _ C into the dimming control signal Sdc, so that the driving circuit 130 can adjust the light-emitting brightness Lux of the LED module LM based on the dimming control signal Sdc, which is similar to the signal conversion of the analog circuit, but not limited to the scope of the present disclosure. In some embodiments, the correspondence relationship between the phase cut angle ANG _ pc and the dimming control signal Sdc shown in fig. 8F may also be a non-linear relationship. For example, the phase cut angle ANG _ pc and the dimming control signal Sdc are exponentially corresponding. Similarly, the corresponding relationship between the dimming control signal Sdc and the light emitting brightness Lux shown in fig. 8F may also be a non-linear relationship, which is not limited in the disclosure. In addition, in some embodiments, the levels of the phase-cut angle ANG _ pc and the dimming control signal Sdc may also be negative correlation. In some embodiments, the brightness La may also be positively correlated with the level Va.

Referring to fig. 6A and fig. 8G, the demodulation module 140 of the present embodiment employs a signal processing means similar to a digital circuit to capture and convert the dimming information, specifically, when the phase-cut angle of the modulated power Pin _ C is adjusted within a default interval, the dimming control signal has a default number of different signal states corresponding to the change of the phase-cut angle, so as to correspondingly control the LED module to dim to a default number of dimming levels. For example, as shown in fig. 8G, when the phase-cut angle ANG _ pc of the modulated power supply Pin _ C is adjusted between the interval C1 and C2, the dimming control signal Sdc has 8 different signal states D1 to D8 corresponding to the change of the phase-cut angle ANG _ pc. In other words, the phase-cut angle ANG _ pc of the modulated power supply Pin _ C is divided into 8 sub-intervals in the dimming phase interval, and each sub-interval corresponds to one signal state D1-D8 of the dimming control signal Sdc. In some embodiments, the signal state may be indicated by a level high or low; for example, the dimming control signal Sdc of the state D1 corresponds to a level of 1V, and the dimming control signal Sdc of the state D8 corresponds to a level of 5V. In some embodiments, the signal state may be indicated by a multi-bit logic level; for example, the dimming control signal Sdc of the state D1 corresponds to a logic level of "000", and the dimming control signal Sdc of the state D8 corresponds to a logic level of "111".

Then, the dimming control signal Sdc with the signal states D1-D8 is provided to the switching control circuit 131, so that the converting circuit 132 generates the corresponding driving power Sdrv to drive the LED module LM, and the LED module LM has the corresponding light emitting brightness Lux. In some embodiments, the signal states D1-D8 may correspond one-to-one to different light emitting luminances Lux of the LED module LM. As shown in fig. 8F, the signal states D1-D8 may correspond to the light emission luminance Lux being 100%, 87.5%, 75%, 62.5%, 50%, 37.5%, 25%, 10%, respectively, of the maximum luminance Lmax, for example. It should be noted that, although the embodiment exemplifies that the demodulation module 140 is designed with a resolution of 3 bits (i.e., 8-segment dimming), the disclosure is not limited thereto.

Fig. 8H is a schematic diagram of an input power waveform of an LED lighting device under different grid voltages according to an embodiment of the disclosure. Referring to fig. 1A, fig. 6A and fig. 8H, it can be seen that, no matter the peak voltage of the input power Pin is a1 or a2, if the dimmer 80 modulates the input power at the phase-cut angle C3, the modulated power Pin _ C generated by the dimmer 80 still has the same zero-level period (i.e., the period from 0 to C3). Therefore, the demodulation module 140 can demodulate the same dimming control signal Sdc for the modulation power supply Pin _ C having the same phase-cut angle regardless of the peak voltage of the input power supply Pin. In other words, no matter which external grid EP specification the LED lighting system 10 is applied to, the LED lighting system 10 can make the LED lighting device 100 have the same brightness or color temperature when receiving the same dimming signal Sdim, and thus can be applied to various grid voltage specifications. From another perspective, in the present disclosure, dimming (e.g., light emission brightness or color temperature) of the LED module is responsive to the phase-cut angle of the modulated power supply Pin _ C, but is not substantially responsive to the peak of the voltage of the external power grid.

It should be noted that: since the parasitic effects of the circuit components themselves or the matching of the components to each other is not necessarily ideal, although the dimming of the LED module is not intended to be responsive to the peak voltage of the external power grid, the dimming effect on the LED module may actually be slightly responsive to the peak voltage of the external power grid, i.e., according to the present disclosure, the dimming of the LED module may be acceptable to be slightly responsive to the peak voltage of the external power grid due to the non-ideality of the circuit, i.e., the aforementioned meaning "substantially" not responsive to the peak voltage of the external power grid, and the same is also referred to as "substantially" herein. The term "micro" may refer to that, in an embodiment, the dimming of the LED module is only affected by less than 5% when the peak value of the voltage of the external power grid is 2 times.

Fig. 1E is a schematic diagram of functional modules of an LED lighting system according to another embodiment of the present invention. The LED lamp lighting system 10 includes a dimmer 80 and an LED lamp 100. The dimmer 80 is electrically connected to external power EP and the LED lamp 100. The dimming circuit is used for generating a dimming signal Sfim according to the dimming operation and transmitting the dimming signal Sfim to the LED lamp. The LED lamp 100 is electrically connected to the external power EP and the dimmer 80, and is configured to receive an external power signal to light up, and perform dimming according to the received dimming signal Sdim. In this embodiment, the LED lamp 100 can realize a complete dimming function only by 3 wires.

In this embodiment, the LED lamp 100 includes a demodulation module 140, an LED driving module LD, and an LED module LM. The demodulation module 140 is electrically connected to the dimmer 80, and is configured to receive the dimming signal Sdim generated by the dimmer and convert the dimming signal Sdim into a dimming control signal Sdc. The LED driving module LD is electrically connected to the demodulation module 140 and the external power EP, and is configured to receive an external power signal to perform power conversion to generate a driving power Sdrv, and receive the dimming control signal Sdc of the demodulation module 140, and adjust the driving power Sdrv according to the dimming control signal Sdc to perform dimming on the LED lamp. The LED module LM is electrically connected to the LED driving module LD, and is configured to receive the driving power Sdrv of the LED driving module LD for lighting.

In this embodiment, the LED lamp 100 may adopt the circuit architecture of fig. 6A-6B, and the LED driving module LD includes a rectifying circuit 110, a filtering circuit 120 and a driving circuit 130. The action principle is described with reference to fig. 6A-6B, and is not described herein.

Fig. 15A is a schematic circuit diagram of a dimmer according to an embodiment of the invention. Dimmer 80 comprises switch 801 and switch 802. One end of the switch 801 is electrically connected to the power signal input terminal L, and the other end is electrically connected to the LED driving module LD and the switch 802. The other end of the switch 802 is electrically connected to the demodulation module 140. In this embodiment, the switch 801 is provided in the entire power supply circuit (the circuit in which the external power EP supplies power to the LED lamp) and functions as a switch of the entire system. Switch 801 is set to be normally open. When the switch 801 is off, the external power signal cannot provide power to the dimmer 80 and the LED lamp, and the LED lamp 100 and the dimmer 80 do not operate; when the switch 801 is closed, the LED lamp lighting system 10 operates normally, and the dimmer 80 may dim the LED lamp. The switch 802 is configured to generate a dimming signal Sdim0 according to a dimming operation. In this embodiment, the switch 802 is a jog switch and is set to be normally open, that is, the switch 802 is in an open state in a normal state, and is closed when pressed, and when the pressing is cancelled, the switch 802 automatically returns to the open state.

The operation principle of the dimmer will be described with reference to fig. 16A.

The switch 801 is closed, and the LED lamp lighting system 10 operates normally. Dimming may be performed by the switch 802 closing and opening operation. The switch 802 is set to be normally open, and when the switch 802 is closed, the dimming signal Sdim0 is in a high level state; when the switch 802 is turned off, the dimming signal Sdim0 is in a low level state. The dimmer 80 converts the switching state of the switch 802 into a dimming signal Sdim0, and the demodulation module 140 receives the dimming signal Sdim0, demodulates the dimming information therein, and converts the dimming signal into a dimming control signal Sdc for the LED driving module LD to use.

When the switch 802 is continuously closed, the LED lamp gradually brightens from the current brightness, and the brightness change speed can be set by parameters of devices inside the LED lamp; when the switch 802 is closed for a short time t1 and then opened, and is closed again after the time t 1', the LED lights are gradually dimmed from the current brightness. The time t1, t 1' and the speed of the brightness change of the LED lamp can be set by the parameters of the internal devices of the LED lamp. In other embodiments, the switch 802 may be a normally closed switch or a dynamic open switch, and the dimming operation may be realized by the switching action of the switch 802, which is not limited in the present invention.

In other embodiments, switch 802 is a jog switch and is set to be normally closed. When the switch 802 is not pressed, the switch 802 is in a closed state, when dimming operation is performed, the switch 802 is pressed, the switch 802 is opened, when the pressing is cancelled, the switch 802 automatically returns to the closed state, that is, when the switch 802 is not pressed, the switch 802 is in the closed state, and when the switch 802 is pressed, the switch 802 is in the open state.

Fig. 15B is a schematic circuit diagram of a dimmer according to another embodiment of the present invention. Dimmer 80 comprises

switches

801, 803 and switch 804. The switch 803 and the switch 804 are connected in parallel and then connected in series with the switch 801, that is, the first pin of the switch 801 is electrically connected to the external power signal input terminal L, the first pin of the switch 803 is electrically connected to the first pin of the switch 804 and is electrically connected to the second pin of the switch 801, the second pin of the switch 803 is electrically connected to the LED driving module LD, and the second pin of the switch 804 is electrically connected to the LED driving module LD. The switch 801 is used as a switch for the entire system, and is the same as the embodiment described in fig. 15A, and is not described here again. The switch 803 and the switch 804 are used to perform a dimming operation. In this embodiment, the switch 803 and the switch 804 are jog switches and are set to be normally closed, that is, in a normal state, the switch 803 and the switch 804 are in a closed state, and when pressed, the switch is opened, and when the pressing is cancelled, the switch automatically returns to the closed state.

The operation principle of the dimmer 80 according to the present embodiment will be described below with reference to fig. 16B.

The switch 801 is closed, and the LED lamp lighting system 10 operates normally. When the dimming operation is not performed, since the switch 803 and the switch 804 are in the closed state, the external power signal may supply power to the LED lamp through the power supply loop formed by the

switches

801 and 803, or may supply power to the LED lamp through the power supply loop formed by the

switches

801 and 804. The dimming signals Sdim1 and Sdim2 are both high at this time. When the dimming operation is performed and the switch 803 or the switch 804 is pressed, the dimming signal Sdim1 or Sdim2 is at a low level. It is to be noted here that the switch 803 and the switch 804 may not be pressed simultaneously when the dimming operation is performed. When the switch 803 and the switch 804 are simultaneously pressed, the power supply circuit of the external power signal is disconnected, and the power supply of the LED lamp cannot be continued. In this embodiment, a mechanical structure for linkage is provided in the switch 803 and the switch 804 to prevent the switch 803 and the switch 804 from being turned off at the same time. In the

switches

803 and 804, when only the switch 803 is operated, the external power signal can supply power to the LED lamp through a power supply loop formed by the switch 801 and the switch 804; when only the switch 804 is activated, the external power signal can supply power to the LED lamp through the power supply loop formed by the switch 801 and the switch 803.

The dimmer 80 dims the LED lamp by dimming signals Sdim1 and Sdim2 generated by the switch 803 and the switch 804. When the switch 803 is continuously pressed, the brightness of the LED lamp is adjusted to gradually become brighter from the current brightness, and when the switch 803 is pressed to be cancelled, the dimming of the LED lamp is ended, and the LED lamp is maintained to the current brightness value; when the switch 804 is continuously pressed, the brightness of the LED lamp is continuously adjusted to be dark from the current brightness, and when the pressed state of the switch 804 is cancelled, the LED lamp is maintained to the current brightness. The speed of the LED lamp becoming bright or dark is set by the parameters of the LED lamp internal devices.

Further, the dimmer 80 may generate a color-adjusting signal through the switch 803 and the switch 804 to adjust the color of the LED lamp. With reference to the color-mixing signal diagram of fig. 16C, when the switch 803 is pressed for a short time to raise the color temperature at t3, and is pressed again after the time t 3', the color temperature of the LED lamp gradually becomes warm from the current color temperature, and when the pressing of the switch 803 is cancelled, the color-mixing of the LED lamp is ended, and the LED lamp is maintained at the current color temperature. When the switch 804 is pressed for a short time for t3 to be lifted and is continuously pressed again after the time t 3', the color temperature of the LED lamp is gradually warmed from the current color temperature, and when the switch 804 is pressed to be cancelled, the color mixing of the LED lamp is finished, and the LED lamp is maintained to the current color temperature. The time t2, t3, t 3' and the speed of the color temperature change of the LED lamp can be set by the parameters of the internal devices of the LED lamp. In this embodiment, the dimming parameter of the switch 803 is the same as the dimming parameter of the switch 804, and in other embodiments, the switch 803 and the switch 804 may set different dimming parameters, which is not limited in the present invention.

Fig. 7F is a schematic circuit diagram of a demodulation module according to an embodiment of the invention. The demodulation module 140 includes a diode 141,

resistors

142 and 143, and a logic circuit 144. The demodulation module 140 in this embodiment can be applied to the embodiment shown in fig. 15A, and the circuit principle of the demodulation module 140 will now be described with reference to fig. 15A. The anode of the diode 141 is electrically connected to the second pin of the switch 802, and the cathode thereof is electrically connected to the first pin of the resistor 142. The first pin of the resistor 143 is electrically connected to the second pin of the resistor 142, and the second pin thereof is electrically connected to a common ground. The logic circuit 144 is electrically connected to the second pin of the resistor 142, and the output end thereof is electrically connected to the LED driving module LD.

When the switch 802 is in a closed state, an external power signal can flow through a path formed by the power line L, the

switches

801 and 802, the diode 141, and the

resistors

142 and 143. When the external power signal is the ac power, the diode 141 allows only the positive half cycle of the power signal to pass through. The resistor 142 and the resistor 143 form a voltage dividing circuit, an electrical signal passing through the diode 141 is subjected to over-voltage division to form a signal V1, the logic circuit 144 receives the signal V1, performs logic operation on the signal V1 to generate a dimming control signal Sdc, and transmits the dimming control signal Sdc to the LED driving module LD, and the LED driving module LD performs dimming according to the received dimming control signal Sdc. The dimming control signal Sdc may be, for example, a PWM dimming signal in the present embodiment, and in other embodiments, the dimming control signal Sdc may also be a dimming signal of 0-10V, which is not limited in the present invention.

In other embodiments, the logic circuit may also be referred to as a signal conversion circuit; the diode 141, the resistor 142, and the resistor 143 may be collectively referred to as a sampling circuit.

Fig. 7G is a circuit diagram of a demodulation module according to another embodiment of the invention. The demodulation module 240 includes

diodes

241, 244,

resistors

242, 243, 245, and 246, and a logic circuit 247. The configuration of the demodulation module 240 in this embodiment is similar to that of the demodulation module 140 in the embodiment shown in fig. 7F, except that a diode 244 and

resistors

245 and 246 are further added in this embodiment. In this embodiment, the demodulation module 240 can be applied to the embodiment shown in fig. 15B, and the operation of the demodulation module 240 is described below with reference to fig. 15B. The anode of the diode 241 is electrically connected to the second pin of the switch 803, the cathode thereof is electrically connected to the first pin of the resistor 242, the first pin of the resistor 243 is electrically connected to the second pin of the resistor 242, and the second pin thereof is electrically connected to a common ground. The anode of the diode 244 is electrically connected to the second pin of the switch 804, the cathode thereof is electrically connected to the first pin of the resistor 245, the first pin of the resistor 246 is electrically connected to the second pin of the resistor 245, and the second pin thereof is electrically connected to a common ground.

When the switch 803 is in a closed state, an external power signal can flow through a path formed by the power input terminal L, the switch 803, the diode 241, and the

resistors

242 and 243. When the external power signal is the commercial power alternating current, the diode only allows the positive half cycle of the power signal to pass through. The resistor 242 and the resistor 243 form a voltage division circuit, a power signal passing through the diode 241 is subjected to voltage division through the resistor 242 and the resistor 243 to form a signal V2, and the logic circuit 247 receives a signal V2; similarly, when switch 804 is in a closed state, signal V3 may be formed at the common terminal of resistor 245 and resistor 246, and logic circuit 247 may receive signal V3. The logic circuit 247 receives the signals V2 and V3, performs a logic operation, and outputs a dimming control signal Sdc to the LED driving module LD. The LED driving module LD performs dimming according to the received dimming control signal Sdc. The dimming signal Sd may be, for example, a PWM dimming signal in the present embodiment, and may also be a dimming signal of 0-10V in other embodiments, which is not limited in the present invention.

In other embodiments, the logic circuit may also be referred to as a signal conversion circuit; the

diodes

241, 244,

resistors

242, 243, 345, and resistor 246 may be collectively referred to as a sampling circuit.

Fig. 6A and 6B are schematic functional block diagrams of LED lighting devices according to some embodiments of the present disclosure. Referring to fig. 6A, the LED lighting device 100 of the present embodiment can be applied to the

LED lighting system

10 or 20 shown in fig. 1A or fig. 1B. The LED lighting device 100 includes a power module PM and an LED module LM, wherein the power module PM further includes a rectifying circuit 110, a filter circuit 120, a driving circuit 130, and a demodulation module 140.

Fig. 12A is a schematic circuit diagram of a rectifier circuit according to an embodiment of the invention. The rectifier circuit RC1 is a full-bridge rectifier circuit including a diode D1, a diode D2, a diode D3, and a diode D4. The anode of diode D1 is connected to the anode of diode D4 and to terminal b2, the cathode of diode D2 is connected to the cathode of diode D3 and to terminal b1, the cathode of diode D1 is connected to the anode of diode D2 and to terminal a1, and the anode of diode D3 and the cathode of diode D4 are connected to terminal a 2. Terminals a1 and a2 are inputs to rectifier circuit RC1, and terminals b1 and b2 are outputs to rectifier circuit RC 1.

When the signal input by the input end of the rectifying circuit RC1 is an alternating current signal, the signal is rectified by the rectifying circuit RC1 to output a direct current signal. When the level of the input end a1 is higher than that of the input end a2, a signal flows in through the input end a1, the diode D2 and the output end b1 of the rectifying circuit and flows out through the output end b2 of the rectifying circuit, the diode D4 and the input end a 2. When the level of the input terminal a2 is higher than that of the input terminal a1, a signal flows in through the input terminal a2, the diode D3 and the rectifier circuit output terminal b1, and flows out through the rectifier circuit output terminal b2, the diode D1 and the dimmer output terminal 80 a. Therefore, the level of the rectifier circuit output terminal b1 is always higher than the level of the rectifier circuit output terminal b2, and the rectifier circuit can output a dc signal.

Fig. 12B is a schematic circuit diagram of a rectifier circuit according to another embodiment of the present invention. The rectifier circuit RC2 includes a diode D5. The diode D5 is connected in series between the input terminal a1 and the output terminal b 1. The input terminal a2 and the output terminal b2 are electrically connected. When the level of the input end a1 is higher than that of the input end a2, a power signal flows in through the input end a1, the diode D5 and the output end b1, and flows out through the output end b2 and the input end a 2; when the level of the input terminal a2 is higher than the level of the input terminal a1, a current path cannot be formed. Therefore, when the signals input by the input terminals a1 and a2 are alternating current, the rectifier circuit RC2 only allows the signals with positive half cycles to pass through, and a half-wave rectified signal is obtained.

The rectifying circuit 110 is electrically connected to the first power supply terminal T1 and the second power supply terminal T2 of the dimmer 80 through the first connection terminal 101 and the second connection terminal 102, respectively, to receive the modulated power Pin _ C, rectify the modulated power Pin _ C, and then output a rectified signal Srec through the first rectifying output terminal 111 and the second rectifying output terminal 112. The modulated power Pin _ C may be an ac signal or a dc signal, which does not affect the operation of the LED lighting device 200. When the LED lighting device 200 is designed to be lit based on a dc signal, the rectifier circuit 110 in the power module PM may be omitted. In the configuration without the rectifying circuit 110, the first connection terminal 101 and the second connection terminal 102 are directly electrically connected to the input terminals (i.e., 111, 112) of the filter circuit 120.

In this embodiment, the rectifying circuit 110 may adopt the circuit architecture of fig. 12A or 12B, and further, the terminal a1 is electrically connected to the first connection terminal 101, and the terminal a2 is electrically connected to the second connection terminal 102, so as to receive the signals of the terminals a1 and a2 and rectify the signals to generate rectified signals. The operation principle of the rectifier circuit 110 is described with reference to fig. 12A and 12B, and is not described herein again.

In some embodiments, the rectifying circuit 110 may be a full-wave rectifying circuit, a half-wave rectifying circuit, a bridge rectifying circuit, or other types of rectifying circuits, which is not limited by the disclosure.

The filter circuit 120 is electrically connected to the rectifier circuit 110, and is configured to filter the rectified signal Srec; that is, the input terminal of the filtering circuit 220 is coupled to the first rectifying output terminal 111 and the second rectifying output terminal 112 to receive the rectified signal Srec and filter the rectified signal Srec. The filtered signal Sflr is output from the first filtered output 121 and the second filtered output 122. The first rectified output 111 may be regarded as a first filter input of the filter circuit 120, and the second rectified output 112 may be regarded as a second filter input of the filter circuit 120. In this embodiment, the filter circuit 120 may filter the ripple in the rectified signal Srec, so that the waveform of the generated filtered signal Sflr is smoother than the waveform of the rectified signal Srec. In addition, the filter circuit 120 can be configured with a selection circuit to filter a specific frequency to filter out the response/energy of the external driving power at the specific frequency. In some embodiments, the filter circuit 120 may be a circuit composed of at least one of a resistor, a capacitor and an inductor, such as a parallel capacitor filter circuit or a pi filter circuit, but the disclosure is not limited thereto. The filter circuit 120 in the power module PM may be omitted when the LED lighting device 100 is designed to be lit based on a dc signal. Under the configuration of omitting the rectifying circuit 110 and the filtering circuit 120, the first connection terminal 101 and the second connection terminal 102 are directly electrically connected to the input terminals (i.e., 121, 122) of the driving circuit 130.

The filter circuit 120 in the present embodiment may employ the filter circuit FC1 or FC2 in fig. 12C or 12D. Further, the terminal c1 is electrically connected to the first rectification output end 111, the terminal c2 is electrically connected to the second rectification output end 112, and the terminals d1 and d2 are respectively electrically connected to the driving circuit 130.

The driving circuit 130 is electrically connected to the filter circuit 120 to receive the filtered signal Sflr and perform power conversion (power conversion) on the filtered signal Sflr to generate a driving power Sdrv; that is, the input terminal of the driving circuit 130 is coupled to the first filtering output terminal 121 and the second filtering output terminal 122 to receive the filtered signal Sflr and then generate the driving power Sdrv for driving the LED module LM to emit light. The first filter output terminal 121 can be regarded as a first driving input terminal of the driving circuit 130, and the second filter output terminal 122 can be regarded as a second driving input terminal of the driving circuit 130. The driving power Sdrv generated by the driving circuit 130 is provided to the LED module LM through the first driving output terminal 130a and the second driving output terminal 130b, so that the LED module LM can be turned on in response to the received driving power Sdrv. The driving circuit 130 of the present embodiment may also be a power conversion circuit including a switching control circuit and a conversion circuit, and for a specific configuration example, reference may be made to the description of the embodiment in fig. 4A and fig. 4B, which is not repeated herein.

The input terminal of the demodulation module 140 is electrically connected to the first connection terminal 101 and the second connection terminal 102 for receiving the modulation power Pin _ C, and the output terminal of the demodulation module 140 is electrically connected to the driving circuit 130 for providing the dimming control signal Sdc. The demodulation module 140 parses/demodulates the brightness information from the modulated power Pin _ C and generates a corresponding dimming control signal Sdc according to the brightness information, wherein the driving circuit 130 adjusts the magnitude of the output driving power Sdrv according to the dimming control signal Sdc. For example, in the driving circuit 130, the switching control circuit (e.g., 72) may adjust the duty ratio of the power switch PSW according to the dimming control signal Sdc, such that the driving power Sdrv increases or decreases in response to the brightness information indicated by the dimming control signal Sdc. When the dimming control signal Sdc indicates a higher light emitting brightness or color temperature, the switching control circuit can increase the duty ratio based on the dimming control signal Sdc, and further cause the power conversion circuit ESE to output a higher driving power Sdrv to the LED module LM; conversely, when the dimming control signal Sdc indicates a lower brightness or color temperature, the switching control circuit may lower the duty ratio based on the dimming control signal Sdc, and then cause the power conversion circuit ESE to output a lower driving power Sdrv to the LED module LM. By this way, the effect of dimming control can be realized.

In some embodiments, the dimming control of the LED module LM can be performed by controlling circuits other than the driving circuit 130, for example, referring to fig. 6B, in the power module 200 of fig. 6B, the operation of generating the driving power based on the modulation power and the operation of demodulating the dimming information from the modulation power Pin _ C are similar to the embodiment of fig. 6A, with the difference that, in the embodiment of fig. 6B, the power module PM further includes the dimming switch 150. The dimming switch 150 turns on or off the driving power Sdrv according to the dimming control signal Sdc to generate an intermittent dimming power Sdrv supplied to the LED module LM to dim the LED module LM. In some embodiments, the dimming control signal Sdc generated by the demodulation module 140 may be a Pulse Width Modulation (PWM) signal, so as to control the dimming switch 150 to be turned on intermittently, thereby achieving a PWM dimming effect.

Fig. 6C is a schematic block diagram of a driving circuit according to an embodiment of the disclosure. Referring to fig. 6A and fig. 6C, the driving circuit 130 is an embodiment of the driving circuit 130 shown in fig. 6A, and includes a switching control circuit 131 and a converting circuit 132, which perform power conversion in a current source mode to drive the LED module LM to emit light. The conversion circuit 132 includes a switching circuit (also referred to as a power switch) PSW and a tank circuit ESE. The conversion circuit 132 is coupled to the first filter output terminal 121 and the second filter output terminal 122, receives the filtered signal Sflr, and converts the filtered signal Sflr into the driving power Sdrv according to the control of the switching control circuit 131, and outputs the driving power Sdrv from the first driving output terminal 130a and the second driving output terminal 130b to drive the LED module LM. Under the control of the switching control circuit 131, the driving power output by the conversion circuit 132 is a stable current, so that the LED filament module stably emits light. In addition, the driving circuit 130 may further include a bias circuit 133, wherein the bias circuit 133 may generate an operating voltage Vcc based on the bus voltage of the power module, and the operating voltage Vcc is provided to the switching control circuit 131 for use, so that the switching control circuit 131 may be activated and operated according to the operating voltage.

The switching control circuit 131 of this embodiment can adjust the Duty Cycle of the output lighting control signal Slc in real time according to the current operating state of the LED module LM, so that the switching circuit PSW is turned on or off in response to the lighting control signal Slc. The switching control circuit 131 may determine the current operating state of the LED module LM by detecting at least one or more of an input voltage (which may be a level on the first connection terminal 101/the second connection terminal 102, a level on the first rectification output terminal 111, or a level on the first filtering output terminal 121), an output voltage (which may be a level on the first driving output terminal 130 a), an input current (which may be a bus current, i.e., a current flowing through the rectification output terminal 111/112 and the filtering output terminal 121/122), and an output current (which may be a current flowing through the driving output terminals 130a/130b, a current flowing through the energy storage circuit ESE, or a current flowing through the switching circuit PSW). The energy storage circuit ESE repeatedly charges/discharges energy according to the on/off state of the switch circuit PSW, so that the driving power Sdrv received by the LED module LM can be stably maintained at a predetermined current value Ipred.

The input end of the demodulation module (140) is electrically connected to the first connection end 101 and the second connection end 102 to receive the modulation power Pin _ C, and the output end of the demodulation module 140 is electrically connected to the driving circuit 130 to provide the dimming control signal Sdc. The demodulation module 140 generates a dimming control signal Sdc according to the magnitude of the phase-cut angle/conduction angle of the modulated power Pin _ C in each period or half period, wherein the switching control circuit 131 adjusts the output of the lighting control signal Slc according to the dimming control signal Sdc, so that the driving power Sdrv is changed in response to the change of the lighting control signal Slc. For example, the switching control circuit 131 may adjust the duty ratio of the lighting control signal Slc according to the dimming control signal Sdc such that the driving power Sdrv increases or decreases in response to the luminance information indicated by the lighting control signal Slc. When the dimming control signal Sdc indicates a higher light emitting brightness or color temperature, the switching control circuit 131 increases the duty ratio based on the dimming control signal Sdc, and further causes the conversion circuit ESE to output a higher driving power Sdrv to the LED module LM; conversely, when the dimming control signal Sdc indicates a lower light emitting brightness or color temperature, the switching control circuit 131 may lower the duty ratio based on the dimming control signal Sdc, and further cause the conversion circuit ESE to output a lower driving power Sdrv to the LED module LM. By this way, the effect of dimming control can be realized.

More specifically, the demodulation processing performed by the demodulation module 140 for the modulated power source Pin _ C may be, for example, signal conversion means such as sampling, counting and/or mapping. For example, the demodulation module 140 may sample and count a zero level duration of the modulated power supply Pin _ C in each period or half period of the modulated power supply Pin _ C, wherein the counted zero level duration may be linearly or non-linearly mapped to a level, and the mapped level may be provided to the switching control circuit 131 as the dimming control signal Sdc. The mapped level range may be selected based on the processing range of the switching control circuit 131, which may be 0V-5V, for example. Fig. 8D is a schematic diagram of a signal waveform and circuit operation of the LED lighting system under different dimming states, and fig. 8D is a schematic diagram of a dimming waveform according to an embodiment of the present disclosure.

More specifically, the demodulation processing performed by the demodulation module 140 for the modulation power Pin _ C may be signal conversion means such as sampling, counting and/or mapping. The configuration and circuit operation of the demodulation module 140 of the present disclosure are further described below with reference to fig. 7A to 7C, fig. 7A is a schematic diagram of functional modules of the demodulation module of some embodiments of the present disclosure, and fig. 7B and 7C are schematic diagrams of circuit architectures of the LED lighting device of some embodiments of the present disclosure.

Referring to fig. 7A, the demodulation module 140 of the present embodiment includes a sampling circuit 141 and a signal conversion circuit 145. The sampling circuit 141 receives the modulated power source Pin _ C, and is configured to collect/extract brightness information from the modulated power source Pin _ C, and accordingly generate a brightness indication signal Sdim' corresponding to a dimming signal (e.g., Sdim) in the dimmer. The signal conversion circuit 145 is electrically connected to the sampling circuit 141 for receiving the brightness indication signal Sdim 'and for generating a dimming control signal Sdc for controlling the subsequent circuit according to the brightness indication signal Sdim'. The signal format of the dimming control signal Sdc is designed or adjusted according to the type of the post-stage circuit; for example, if the demodulation module 140 implements the dimming function by controlling the driving circuit 130, the dimming control signal Sdc may be, for example, a signal with at least one of a level, a frequency and a pulse width proportional to the dimming information; if the demodulation module 140 controls the dimming switch 150 to perform the dimming function, the dimming control signal Sdc may be, for example, a signal with a pulse width proportional to the dimming information.

Fig. 7B and 7C are diagrams illustrating an exemplary demodulation module 140 according to some embodiments of the disclosure. Referring to fig. 7B, in the power module of the present embodiment, the driving circuit 130 includes a switching control circuit 131 and a converting circuit 132, and the demodulating module 140 includes a sampling circuit 141 and a signal converting circuit 145 a. In the driving circuit 130, the converting circuit 132 includes a resistor R41, an inductor L41, a freewheeling diode D41, a capacitor C41 and a transistor M41, wherein the connection configuration among the above components is similar to the resistor R21, the inductor L21, the freewheeling diode D21, the capacitor C21 and the transistor M21 in the embodiment of fig. 4B, and therefore, the description thereof is not repeated. The sampling circuit 141 includes a coupling circuit 142. The coupling circuit 142 is electrically connected to the first connection terminal 101, the second connection terminal 102 and the signal conversion circuit 145a, and is configured to filter a dc component of the modulated power source Pin _ C, so as to extract dimming information in the modulated power source Pin _ C, wherein the coupling circuit 142 may be implemented by a capacitor C51, for example.

In some embodiments, the sampling circuit 141 further comprises a plurality of electronic components for voltage regulation or level adjustment, such as resistors R51-R53 and a voltage regulator ZD 51. One end of the capacitor C51 is electrically connected to the first connection terminal 101. The resistor R51 is electrically connected between the other end of the capacitor C51 and the second connection terminal 102. One end of the resistor R52 is electrically connected to the connection end of the capacitor C51 and the resistor R1, and the other end of the resistor R52 is electrically connected to the signal conversion circuit 145 a. The resistor R53 is electrically connected between the other end of the resistor R52 and the second connection terminal 102. The voltage regulator tube ZD51 is connected with the resistor R51 in parallel. Under the above configuration, the signal at the connection end of the resistors R52 and R53 can be regarded as the brightness indicating signal Sdim'.

The signal conversion circuit 145a generates a dimming control signal Sdc having a corresponding frequency, voltage and duty ratio based on the brightness information indicated by the brightness indication signal Sdim' and provides the dimming control signal Sdc to the switching control circuit 131, so that the switching control circuit 131 can generate a lighting control signal Slc to adjust the switching behavior of the transistor M41 according to the dimming control signal Sdc, and further, the driving power Sdrv generated by the driving circuit 130 changes in response to the brightness information. In other embodiments, the lighting control signal may also be referred to as a dimming indication signal.

The operation of the demodulation module 140 is described below with reference to fig. 9A and 9B, wherein fig. 9A and 9B are schematic signal waveforms of an LED lighting device according to some embodiments of the present disclosure. Here, similarly to the previous embodiments, the brightness of the LED module is adjusted to 30% and 70% of the maximum brightness as an example, but the disclosure is not limited thereto. Referring to fig. 7B, fig. 9A and fig. 9B, when the LED device receives the modulation power Pin _ C having a dc component (e.g., a dc set voltage Vset) and an ac component (e.g., a pulse based on the set voltage Vset), on one hand, the driving circuit 130 is activated and performs power conversion to generate the driving power Sdrv in response to the modulation power Pin _ C; on the other hand, the demodulation module 140 couples out the ac component of the modulated power Pin _ C through the capacitor C51, and performs voltage division and stabilization through the resistors R51-R53 and the voltage regulator ZD51 to generate the brightness indication signal Sdim'. The brightness indication signal Sdim' may have a pulse shape, for example, and each pulse is substantially synchronous with the ac component of the modulation power Pin _ C. The dimming information/brightness information given by the dimmer can be considered to be contained in the frequency information of the brightness indication signal Sdim'. As shown in fig. 9A and 9B, the frequency of the luminance indicating signal Sdim 'indicating 30% luminance may be less than that of the luminance indicating signal Sdim' indicating 70% luminance, i.e., the period T1 of the luminance indicating signal Sdim 'indicating 30% luminance may be greater than the period T2 of the luminance indicating signal Sdim' indicating 70% luminance.

The brightness indication signal Sdim' triggers the signal conversion circuit 145a to generate a square wave with a fixed pulse width PW as the dimming control signal Sdc. In fig. 9A and 9B, the signal conversion circuit 145a triggers square wave generation based on the rising edge of the brightness indication signal Sdim' is shown as an example, but the disclosure is not limited thereto. In other embodiments, the signal conversion circuit 145a may also be triggered based on a falling edge of the brightness indication signal Sdim ', or based on a manner of determining whether a voltage of the brightness indication signal Sdim' reaches a specific value. In addition, since the square wave in the dimming control signal Sdc is triggered based on the pulse of the brightness indication signal Sdim ', the frequency of the dimming control signal Sdc is substantially the same as that of the brightness control signal Sdim'.

Through the signal conversion operation, when the switching control circuit 131 receives the dimming control signal Sdc indicating 30% of the maximum brightness, the switching control circuit 131 reduces the duty ratio of the transistor M41 so that the current value of the driving power supply Sdrv is reduced to 30% of the rated current value; when the switching control circuit 131 subsequently receives the dimming control signal Sdc indicating 70% of the maximum brightness, the switching control circuit 131 increases the duty ratio of the transistor to increase the current value of the driving power Sdrv from 30% to 70% of the rated current value, thereby achieving the dimming effect.

Referring to fig. 7C, another configuration of the demodulation module 140 is shown in the present embodiment, which is substantially the same as the configuration of the embodiment shown in fig. 7B, and the main difference is that the sampling circuit 141 of the present embodiment further includes a transistor M51 and a resistor R54, and the signal conversion circuit is implemented by a falling edge triggered signal conversion circuit 145B, wherein the transistor M51 and the resistor R54 form a signal inversion module to invert the signal at the connection end of the resistors R52 and R53 and output a brightness indication signal Sdim'. The transistor M51 and the resistor R54 may be referred to as a signal conversion circuit.

Specifically, the transistor M51 has a first end, a second end and a control end, the first end is electrically connected to the signal conversion circuit 145b, the second end is electrically connected to the second connection end 102 (which can also be regarded as the ground end GND2), and the control end is electrically connected to the connection ends of the resistors R52 and R53. One end of the resistor R54 is electrically connected to a bias power Vcc2 (which may be, for example, divided from a bus), and the other end of the resistor R54 is electrically connected to a first end of the transistor M51, wherein a signal at a connection end of the transistor M51 and the resistor R54 may be regarded as a brightness indication signal Sdim'.

In the embodiment of fig. 7C, the signal at the connection of resistors R52 and R53 serves as the control signal for transistor M51. When the control signal is at a high level, the transistor M51 is turned on, such that the first terminal of the transistor M51 can be regarded as being shorted to the ground GND2, and therefore the brightness indication signal Sdim' is pulled down to a low level (ground level); when the control signal is low, the transistor M51 is turned off, and thus the brightness indicating signal Sdim' is pulled up to high (the bias power source Vcc 2). In other words, the signal level of the brightness indicating signal Sdim' is opposite to the signal level at the connection end of the resistors R52 and R53.

The operation of the demodulation module 140 is described below with reference to fig. 9C and 9D, where fig. 9C and 9D are schematic signal waveforms of an LED lighting device according to some embodiments of the present disclosure. Here, similarly to the previous embodiments, the brightness of the LED module is adjusted to 30% and 70% of the maximum brightness as an example, but the disclosure is not limited thereto. Referring to fig. 7C, fig. 9C and fig. 9D, when the LED device receives the modulation power Pin _ C having a dc component (e.g., a dc set voltage Vset) and an ac component (e.g., a pulse based on the set voltage Vset), on one hand, the driving circuit 130 is activated in response to the modulation power Pin _ C and performs power conversion to generate the driving power Sdrv; on the other hand, the demodulation module 140 couples out the ac component of the modulated power Pin _ C through the capacitor C51, and performs voltage division and stabilization through the resistors R51-R53 and the voltage regulator ZD51 to generate the control signal of the transistor M51. The transistor M51 is switched to affect the signal state on its first terminal to form the brightness indicating signal Sdim'. The brightness indication signal Sdim' may have an inverted pulse waveform (i.e., the reference level is high, and the pulse period is switched to low), and each pulse is substantially synchronous with the ac component in the modulation power supply Pin _ C. The dimming information/brightness information given by the dimmer can be considered to be contained in the frequency information of the brightness indication signal Sdim'.

The brightness indication signal Sdim' triggers the signal conversion circuit 145b to generate a square wave with a fixed pulse width PW as the dimming control signal Sdc. In fig. 9C and 9D, the signal conversion circuit 145b is shown to trigger square wave generation based on the rising edge of the brightness indication signal Sdim', but the disclosure is not limited thereto.

Through the signal conversion operation, when the switching control circuit 131 receives the dimming control signal Sdc indicating 30% of the maximum brightness, the switching control circuit 131 decreases the duty ratio of the transistor M41 so that the current value of the driving power Sdrv is decreased to 30% of the rated current value; when the switching control circuit 131 subsequently receives the dimming control signal Sdc indicating 70% of the maximum brightness, the switching control circuit 131 increases the duty ratio of the transistor to increase the current value of the driving power Sdrv from 30% to 70% of the rated current value, thereby achieving the dimming effect.

Since the demodulation module 140 only uses the ac component in the modulation power supply Pin _ C as the trigger of the dimming control signal Sdc, rather than directly controlling the dimming behavior of the driving circuit 130 based on the signal, even if the dimming controller 80 suffers from other unexpected factors and the modulation power supply Pin _ C fluctuates or is unstable, the demodulation module 140 can ensure that the dimming control does not malfunction due to voltage fluctuation even if the signal pulse is identified, thereby improving the reliability of the LED lighting device.

In other embodiments, the sampling circuit 141 may be referred to as a signal parsing module and the signal conversion circuit 145 may be referred to as a signal generating module. The driving circuit 130 may be referred to as a power conversion module.

In other embodiments, the signal conversion circuit 145 includes a trigger circuit coupled to the sampling circuit 141 for receiving the sampling circuit 141 to receive the brightness indicating signal Sdim'. For example, when the trigger circuit detects a rising edge signal in the brightness indication signal Sdim', it triggers a pulse with a pulse width Th, which may be set by the internal device of the trigger. The converted signal is a dimming control signal Sdc, the frequency of the dimming control signal Sdc is consistent with the brightness indication signal Sdim', and the pulse width is Th.

Referring to fig. 7D and fig. 7E simultaneously, fig. 7D is a schematic block diagram of an embodiment of a demodulation module 240 in the LED lighting device according to the embodiment of the disclosure, and fig. 7E is a schematic diagram of a corresponding relationship of waveforms of the demodulation module in the LED lighting device according to the embodiment of the disclosure. As shown in fig. 7D, in an embodiment, the demodulation module 240 includes a level judgment circuit 241, a sampling circuit 242, a counting circuit 243, and a mapping circuit 244. The level determination circuit 241 is used for detecting whether the modulated power Pin _ C is located in the threshold interval VTB0 to determine whether the modulated power Pin _ C is at a zero level, specifically, as shown in fig. 7E, in an embodiment, the level determination circuit 241 compares the level of the power Pin _ C with the upper threshold Vt1 and the lower threshold Vt2 to determine whether the modulated power Pin _ C is located in the threshold interval VTB0, and when the modulated power Pin _ C is indeed located in the threshold interval VTB0, the level determination circuit 241 outputs a zero level determination signal S0V having a first logic level (e.g., a high logic level) to indicate that the modulated power Pin _ C is indeed located in the threshold interval VTB 0. The sampling circuit 242 is configured to sample the zero level determination signal S0V according to the clock signal CLK to generate the sampling signal Spls in the form of pulses, wherein when the sampled zero level determination signal S0V is at a high logic level (which represents that the modulation power Pin _ C is indeed located within the threshold interval VTB 0), the sampling signal Spls outputs pulses, and then the counting circuit 243 counts the number of pulses of the sampling signal Spls within a period of 1/2 commercial power sources (e.g., corresponding to 50Hz or 60Hz) to generate the counting signal Scnt, and the mapping circuit 244 maps and generates the dimming control signal Sdc according to a ratio of the counting signal Scnt (which indicates the number of pulses of the sampling signal Spls) to the total number of clock signals CLK within the period of 1/2 commercial power sources. Wherein the reset signal RST is synchronized to 1/2 cycles of the mains for resetting the counting circuit. It should be noted that the dimming control signal Sdc in the present disclosure is not in the power loop of the LED module LM and the driving power Sdrv, in other words, the dimming control signal Sdc is not used to directly drive the power of the LED module LM. From another perspective, the current or power of the dimming control signal Sdc is much smaller than that of the driving power Sdrv. Specifically, in some embodiments, the current or power of the dimming control signal Sdc is far below 1/10, 1/100, or 1/100 of the current or power of the driving power supply Sdrv.

Fig. 10A and 10B are flowcharts illustrating steps of a dimming control method of an LED lighting device according to some embodiments of the present disclosure. The dimming control method described herein can be applied to the LED lighting system or the LED lighting device described in any one of the embodiments of fig. 1 to 7C. Referring to fig. 10A, in the dimming control method of the present embodiment, a power module in the LED lighting device performs power conversion on an input power and generates a driving power to be provided to the LED module (step S110). On the other hand, the demodulation module in the LED lighting device captures the signal characteristics of the input power (step S120). The demodulation module demodulates the captured signal characteristics to extract the brightness information and generate a corresponding dimming control signal (step S130). Then, the power module adjusts the power conversion operation with reference to the dimming control signal generated by the demodulation module, so as to adjust the driving power size in response to the brightness information (step S140).

In some embodiments, steps S120 to S140 may be further implemented according to the control method described in fig. 10B. Referring to fig. 10B, in the present embodiment, the demodulation module may generate a first characteristic signal by filtering a dc component of the input power (step S220), where the first characteristic signal is the brightness indication signal Sdim' as mentioned in the previous embodiments. Next, the demodulation module triggers generation of a dimming control signal based on a rising edge or a falling edge of the first characteristic signal (step S230), and enables the switching control circuit in the power module to adjust the driving power according to the duty ratio of the dimming control signal (step S240).

Fig. 10C is a flowchart illustrating a dimming control method of an LED lighting system according to an embodiment of the disclosure. Referring to fig. 1A and fig. 10C, an overall dimming control method is described in terms of the LED lighting system 10. First, the dimmer 80 modulates the input power Pin according to the dimming command DIM and generates a modulated power Pin _ C according to the dimming command DIM (step S310), wherein the modulated power Pin _ C has a signal characteristic indicating dimming information, and the signal characteristic may be, for example, a phase-cut angle/a conduction angle of the modulated power Pin _ C. The modulated power Pin _ C is provided to the LED lighting device 100, so that the LED lighting device 100 performs power conversion based on the modulated power Pin _ C and lights the internal LED module (step S320). On the other hand, the LED lighting device 100 extracts the signal characteristics from the modulated power Pin _ C (step S330), and demodulates the extracted signal characteristics to extract the corresponding dimming information (step S340). Then, the LED lighting device 100 refers to the demodulated dimming information to adjust the power conversion operation, so as to change the brightness or color temperature of the LED module (step S350).

More specifically, referring to fig. 6A, the above-mentioned operations of extracting the signal characteristic (step S330) and demodulating the modulated power Pin _ C (step S340) can be implemented by the demodulation module 140 in the LED lighting device 100/200. In one embodiment, the LED lighting device 100 performs power conversion based on the modulated power Pin _ C and lights the internal LED modules (step S320), and adjusts the power conversion operation with reference to the dimming information, so that the operation of adjusting the light emitting brightness of the LED modules (step S350) can be implemented by the driving circuit 230 in the LED lighting device 100/200.

The overall dimming control method is further described below in terms of the LED lighting device 100, as shown in fig. 10D. Fig. 10D is a flowchart illustrating a dimming control method of an LED lighting device according to an embodiment of the disclosure. Please refer to fig. 1A, fig. 6A and fig. 10D. When the LED lighting device 100 receives the modulation power Pin _ C, the rectifying circuit 110 and the filtering circuit 120 sequentially rectify and filter the modulation power Pin _ C, and accordingly generate a filtered signal Sflr to the driving circuit 130 (step S410). The driving circuit 130 performs power conversion on the received filtered signal Sflr and generates a driving power Sdrv to be provided to the rear LED module (step S420). On the other hand, the demodulation module 140 extracts the signal characteristics of the modulated power Pin _ C (step S430), and then demodulates the extracted signal characteristics to extract the dimming information (e.g., the magnitude of the angle corresponding to the phase cut angle), and generates the corresponding dimming control signal Sdc (step S440). The driving circuit 130 adjusts the power conversion operation with reference to the dimming control signal Sdc, so as to adjust the magnitude of the generated driving power Sdrv in response to the dimming information (step S450), thereby changing the brightness or color temperature of the LED module LM.

Further, the dimming control signal Sdc is used to adjust the power conversion operation of the driving circuit 130, and in one embodiment, the dimming control signal Sdc may be an analog control method, for example, the level of the dimming control signal Sdc may be used to analog control the voltage or current reference of the driving circuit 130, so as to analog adjust the magnitude of the driving power Sdrv.

In some embodiments, the dimming control signal Sdc is used to adjust a power conversion operation of the driving circuit 130, and in an embodiment, optionally, a digital control manner, for example, the dimming control signal Sdc may have different duty ratios in response to the phase-cut angle, and in such embodiments, the dimming control signal Sdc may have, for example, a first state (e.g., a high logic state) and a second state (e.g., a low logic state), and in an embodiment, the first state and the second state are used to digitally control a magnitude of the driving power Sdrv of the driving circuit 130, for example, an output current in the first state, and an output current in the second state is stopped, so as to dim the LED module LM.

Referring to fig. 13A, which is a schematic circuit diagram of an embodiment of the LED module of the present application, as shown in the figure, a positive terminal of the LED module LM is coupled to the first driving output terminal 130a of the driving apparatus, and a negative terminal thereof is coupled to the second driving output terminal 130 b. The LED module LM includes at least one LED unit 200a, and the LED units 200a are connected in parallel with each other when there are two or more. The positive terminal of each LED unit is coupled to the positive terminal of the LED module LM to be coupled to the first driving output terminal 130 a; the negative terminal of each LED unit is coupled to the negative terminal of the LED module LM to couple to the first driving output terminal 322. The LED unit 200a contains at least one LED assembly 2000a, i.e. a light source of an LED lamp. When there are a plurality of LED assemblies 2000a, the LED assemblies 2000a are connected in series, the positive terminal of the first LED assembly 2000a is coupled to the positive terminal of the LED unit 200a, and the negative terminal of the first LED assembly 2000a is coupled to the next (second) LED assembly 2000 a. While the positive terminal of the last LED assembly 2000a is coupled to the negative terminal of the previous LED assembly 2000a and the negative terminal of the last LED assembly 2000a is coupled to the negative terminal of the LED unit 200 a.

Referring to fig. 13B, which is a schematic circuit diagram of an embodiment of the LED module of the present application, as shown in the figure, a positive terminal of the LED module LM is coupled to the first driving output terminal 130a, and a negative terminal thereof is coupled to the first driving output terminal 130B. The LED module LM of the present embodiment includes at least two LED units 200b, and a positive terminal of each LED unit 200b is coupled to a positive terminal of the LED module LM, and a negative terminal of each LED unit is coupled to a negative terminal of the LED module LM. The LED unit 200b comprises at least two LED assemblies 2000b, the LED assemblies 2000b in the LED unit 200b are connected in the same manner as described in fig. 13A, the cathode of the LED assembly 2000b is coupled to the anode of the next LED assembly 2000b, the anode of the first LED assembly 2000b is coupled to the anode of the LED unit 200b, and the cathode of the last LED assembly 2000b is coupled to the cathode of the LED unit 200 b. Further, the LED units 200b in this embodiment are also connected to each other. The n-th LED assembly 2000b of each LED unit 200b has anodes connected to each other and cathodes connected to each other. Therefore, the connection between the LED assemblies of the LED module LM of the present embodiment is a mesh connection. In practice, the number of the LED assemblies 2000b included in the LED unit 200b is preferably 15-25, and more preferably 18-22.

Incidentally, although the above embodiments are described by adjusting the light emitting brightness of the LED module, the same can be analogized to the adjustment of the color temperature of the LED module. For example, if the dimming control method is applied to only adjust the driving power provided to the red LED lamp bead (i.e., only the brightness of the red LED lamp bead is adjusted), the color temperature of the LED lighting device can be adjusted by the dimming control method.

Fig. 1D is a circuit block diagram of a fault detection module according to an embodiment of the invention. The LED lighting system 10 in this embodiment further includes a fault detection module 90. The fault detection module 90 is electrically connected to the dimmer 80. Referring to fig. 1A-1C, the LED lamp 100 includes a plurality of lamps 100_1, 100_2 · 100 — n, and the dimmer 80 is provided with a protection circuit, and when one or more lamps in the LED lamp 100 fail to trigger the protection circuit of the dimmer, or when the dimming failure causes the whole LED lighting system 10 to be broken down, it is difficult for a service person to determine that the failure point is the dimmer 80 or a specific failed lamp. Generally, the repair can be performed by replacing the lamp, but when the number of lamps included in the LED is large, the replacement is troublesome. Fault detection module 90 may service LED lighting system 10 by bypassing dimmer 80.

Fig. 14A is a schematic circuit diagram of a fault detection module according to an embodiment of the invention. The operation of the fault detection module 90 is explained. The fault detection module 90 includes a switch 901, the switch 901 is connected in parallel with the dimmer 80, a first pin of the switch 901 is electrically connected to the power input terminal a1, and a second pin thereof is electrically connected to the dimmer output terminal 80 a. When the dimmer 80 fails or the LED lamp 100 fails, causing the entire lighting system to malfunction, the switch 901 may be used for fault detection. In a normal state, the switch 901 is in an off state, and the dimmer 80 can normally control the LED lamp 100. When the lighting system fails, the switch 901 is closed, at this time, the dimmer 80 is bypassed by the switch 901, the external power EP can directly supply power to the LED lamp 100, at this time, if the LED lamp 100 is normally lit, the failure of the LED lamp 100 can be eliminated, and then the dimmer 80 is overhauled; if one or more lamps of the LED lamps 100 cannot be normally turned on due to a fault, other lamps may be normally turned on, and only the faulty lamp that cannot be turned on needs to be replaced. Through the configuration, system faults can be conveniently detected to determine the fault point, and overhaul is convenient for maintainers to overhaul.

In this embodiment, the switch 901 is a normally open switch, and may be disposed inside the dimmer 80, and may be triggered by mechanical triggering or a control interface of the dimmer 80. In other embodiments, the dimmer 80 may also be other types of controllers, and the invention is not limited in this regard.

Fig. 14B is a schematic circuit diagram of a fault detection module according to another embodiment of the invention. The fault detection module 90 includes a switch 901 and a switch 902. The dimmer 80 of the present embodiment is electrically connected to the power input terminals a1 and a2 for receiving an external power signal, and has

dimmer output terminals

80a and 80 b. The

dimmer outputs

80a and 80b are electrically connected to the LED lamp. The switch 901 has a first pin electrically connected to the power input a1 and a second pin electrically connected to the dimming output 80 a. The switch 902 has a first pin electrically connected to the power input a2 and a second pin electrically connected to the dimmer output 80 b. In the normal state, the

switches

901 and 902 are in the off state, and the dimmer 80 operates normally. When the LED lamp lighting system fails and troubleshooting is performed, the

switches

901 and 902 are closed, the dimmer 80 is bypassed by the

switches

901 and 902, and the external power signal can directly supply power to the LED lamp through the

switches

901 and 902. At this time, if the LED lamp 100 is normally lit, the fault of the LED lamp 100 can be eliminated, and then the light modulator 80 is repaired; if one or more lamps of the LED lamps 100 can not be lit normally due to a fault, other lamps are lit normally, and at this time, only the lamps that can not be lit need to be replaced. Through the configuration, system faults can be conveniently detected to determine the fault point, and overhaul is convenient for maintainers to overhaul.

In this embodiment, the switch 901 and the switch 902 are normally open switches, and may be disposed inside the dimmer 80, and may be triggered by mechanical triggering or a control interface of the dimmer 80. In other embodiments, the dimmer 80 may also be other types of controllers, and the invention is not limited in this regard.

Fig. 17 is a schematic diagram of a lighting system according to another embodiment of the present invention. The lighting system 10 includes an infrared remote control 50 and a lamp set 100. The infrared remote controller 50 is one of control interfaces. In this embodiment, the lamp set 100 includes lamps 100_1, 100_2 · 100 — n. The lamp is provided with an infrared signal receiving device for receiving the infrared control signal of the infrared remote controller 50 and adjusting the brightness of the lamp according to the infrared control signal. The infrared remote controller 50 is used to generate an infrared control signal. Since the infrared signal has directivity, when dimming the lamp set 100 using the infrared remote controller 50, the lamps 100_1 and 100_2 within the signal range of the infrared remote controller 50 may receive the infrared control signal to perform dimming. However, other lamps not within the signal range of the infrared remote controller 50 cannot receive the infrared control signal, and thus cannot perform dimming.

In other embodiments, the infrared remote controller 50 can also control the color temperature of the lamp set 100, which is not limited by the invention.

Fig. 18A is a schematic diagram of a lighting system according to another embodiment of the present invention. The lighting system 10 in this embodiment is similar to the embodiment shown in fig. 17, except that the lighting system 10 in this embodiment further includes an infrared repeater 40. The infrared relay 40 is disposed between the infrared remote controller 50 and the lamp set 100. Fig. 19A is a schematic circuit architecture diagram of an infrared repeater according to an embodiment of the present invention. The infrared repeater 40 includes an infrared signal receiving module 41, an infrared signal amplifying module 42, and an infrared signal transmitting module 43. The infrared signal receiving module 41 is configured to receive an infrared control signal of the infrared remote controller 50 and transmit the infrared control signal to the infrared signal amplifying module 42. The infrared signal amplifying module 42 performs operation amplification processing on the received infrared control signal, and sends the amplified red control signal to the infrared signal transmitting module 43. The infrared signal transmitting module 43 transmits the amplified infrared control signal. Through the configuration, the infrared repeater 40 amplifies the received infrared control signal, firstly amplifies the power intensity of the infrared control signal, and secondly amplifies the coverage angle of the infrared control signal, so that the infrared control signal can cover a larger space, and the problem of insufficient signal coverage capability of the remote controller is solved. The infrared control signals relayed and amplified by the infrared repeater can cover all lamps in a use scene, so that all lamps can be uniformly subjected to dimming control, and the dimming consistency is improved.

In other embodiments, the infrared signal received and amplified by the infrared repeater is not limited to the infrared control signal in the lighting system, and similarly, other infrared control signals, such as the infrared control signal of a television, the infrared control signal of an air conditioner, and the like, may be relayed and amplified by using the infrared repeater in the present invention to obtain better signal coverage.

The infrared remote controller 50 needs to be moved for use, generally uses dry batteries for power supply, and has small transmitting power and limited effective transmitting distance of wireless control signals. Since the infrared repeater 40 does not need to move frequently, a lithium battery or a commercial power can be used for supplying power, so that the amplified infrared control signal has larger power and can transmit a longer transmission distance. The infrared relay 40 may be disposed independently, integrated into one or more lamps of the lamp set 100, or integrated into other household appliances.

Fig. 18B is a schematic diagram of an architecture of an illumination system according to another embodiment of the invention. In this embodiment, an obstacle OBS1 exists between the infrared remote controller 50 and the lamp set 100, and if the infrared repeater 40 is not arranged, the infrared signal of the infrared remote controller 50 is blocked by the obstacle OBS1 and cannot completely cover all lamps in the lamp set 100, and some lamps in the lamp set 100 cannot be normally used because they cannot receive the control signal. After the infrared repeater 40 is disposed in the system, the control signal of the infrared remote controller 50 may be relayed by the infrared repeater 40 to increase the coverage angle of the control signal, so as to cover all the lamps in the lamp group 100, and ensure the normal operation of the lighting system 10.

Since the infrared signal is propagated in a directional manner and the coverage angle of a single infrared emitting component is limited, the infrared emitting module 43 may be configured with a plurality of infrared emitting components in order to obtain a larger coverage angle. A plurality of emitting assemblies are arrayed to achieve a larger emitting angle. As shown in fig. 18A-18B, the infrared repeater 40 has a larger signal transmission angle relative to the infrared remote control 50, and can cover all of the light fixtures in the light set 100.

Fig. 18C is a schematic diagram of a lighting system according to another embodiment of the present invention. Grouping control of the lamps in the lamp group 100 can be realized through the infrared repeater 40. For example, lamps 100_1 and 100_2 can be set as group 1 and the other lamps can be set as group 2. The grouping control can be performed by setting different channels. The group 1 luminaires may identify a first channel of control signals, the group 2 luminaires may identify a second channel of control signals, and both the group 1 and group 2 luminaires may receive a third channel of control signals. The infrared remote controller 50 adjusts the light of the lamps of the group 1 by the signal of the first signal, adjusts the light of the lamps of the group 2 by the signal of the second channel, and adjusts the light of the

groups

1 and 2 simultaneously by the signal of the third channel. The three channels are independent from each other and do not interfere with each other, the lamps of the group 1 are not controlled by the signal of the second channel, and the lamps of the group 2 are not controlled by the signal of the first channel. In the embodiment of the present invention, more groups may be set to control the lamps, and the number of channels may be increased according to needs, which is not limited in the present invention.

Fig. 19B is a schematic circuit diagram of an infrared repeater according to an embodiment of the present invention. Referring to fig. 19A, the infrared repeater 40 includes an infrared signal receiving module 41, an infrared signal amplifying module 42, and an infrared signal transmitting module 43. The infrared signal receiving module 41 includes an infrared receiving probe 41 a. The first pin of the infrared receiving probe is electrically connected to a common power terminal Vcc, the second pin is electrically connected to the first pin of the capacitor 42a, and the third pin is electrically connected to a common ground terminal GND. The infrared receiving probe 41a is used to receive the infrared control signal and convert the optical signal into an electrical signal.

The infrared signal amplification module 42 receives the electric signal generated by the infrared receiving probe 41a, and performs arithmetic amplification processing. The infrared amplification module 42 includes a capacitor 42a,

resistors

42b, 42c, 42d, 42f, 42i, and 42k,

transistors

42e, 42g, and 42h, and a field effect transistor 42 j. The second pin of the capacitor 42a is electrically connected to a common ground GND. The resistor 42b is connected in parallel with the capacitor 42a, a first pin of the resistor 42c is electrically connected to a first pin of the capacitor 42a, and a second pin of the resistor 42c is electrically connected to a first pin of the transistor 42 e. The second pin of the transistor 42e is electrically connected to the second pin of the resistor 42d, and the third pin thereof is electrically connected to a common ground GND. The first pin of the resistor 42d is electrically connected to a common power source terminal Vcc. A first pin of transistor 42g and a first pin of transistor 42h are electrically connected to a second pin of transistor 42e and a first pin of resistor 42 f. The second pin of the resistor 42f is electrically connected to a common ground GND. A second pin of the transistor 42g is electrically connected to a power source terminal Vcc, and a third pin thereof is electrically connected to a second pin of the transistor 42 h. The third pin of the transistor 42h is electrically connected to a common ground GND. A first pin of the resistor 42i is electrically connected to a third pin of the transistor 42g, and a second pin thereof is electrically connected to a first pin of the field effect transistor 42 j. The second terminal of the field effect transistor 42j is electrically connected to the cathode of the infrared led 43_1, and the third terminal thereof is electrically connected to a common ground terminal GMD. The resistor 42k has a first pin electrically connected to a power terminal Vcc, and a second pin electrically connected to the anode of the infrared led 43_ 1.

The infrared emission module 43 includes an infrared Light Emitting Diode (LED) and 43-1, 43_ 2. 43_ n (n is an integer greater than or equal to 1). The infrared light emitting diodes are connected in parallel and structurally arranged in an array mode so as to improve the emission angle of infrared signals.

Fig. 20 is a schematic diagram of an operating waveform of an infrared repeater according to an embodiment of the present invention. The operation of the infrared repeater will be described with reference to fig. 19B. S1 is an infrared signal received by the infrared repeater 40, S2 is a schematic diagram of a waveform output by the infrared receiving probe 41a, and S3 is a schematic diagram of an output waveform of the infrared repeater 40. When the signal S1 is at a low level, the infrared receiver probe 41a outputs a high level signal, the transistor 42e is turned on, and the transistor 42g and the transistor 42h form a totem pole to improve the signal driving capability, so that the output and the input signals are consistent, and the driving capability is increased. The signal received by the fet 42j is a low level signal, which is output from the totem pole, and at this time, the fet 42j is turned off, and the infrared leds 43_1 and 43_2 · 43 — n are not lit, i.e., S3 is low level. When S1 is at high level, the infrared receiving probe 41a outputs a low level signal, the transistor 42e is turned off, and simultaneously the totem pole outputs a high level signal, so that the field effect transistor 42j is turned on, and the infrared light emitting diodes 43_1, 43_2 · 43 — n are lit, i.e., S3 is at high level.

With this circuit configuration, the level directions of S1 and S2 can be kept consistent, because the infrared emission module 43 is composed of a plurality of infrared light emitting diodes, and the infrared repeater 40 can output a high-power infrared signal to amplify the input signal. The infrared light emitting diodes are arranged in an array mode, and the signal coverage range of the infrared repeater can be remarkably improved. The circuit architecture of the embodiment can realize the relay amplification function of the infrared signal only by using discrete devices, and has low cost and high system reliability.

Fig. 21 is a schematic signal coverage diagram of an infrared repeater according to an embodiment of the present invention, and illustrates a transmission angle of the infrared repeater. A three-dimensional coordinate system is established by taking the infrared repeater 40 as a center, the infrared repeater 40 comprises a plurality of infrared emission components, the plurality of infrared emission components are distributed on the infrared repeater 40 in an array mode, and coverage angles of different infrared emission components are partially overlapped so as to achieve signal coverage in a larger angle. For example, a certain number of infrared emission components are arranged in the positive direction of the Z-axis, so that the signal coverage of the space Z ≧ 0 can be realized. In other embodiments, full spatial signal coverage may be achieved by providing more infrared emitting components.

Similarly, in order to increase the usage scenarios of the infrared repeater and obtain a more perfect usage experience, the infrared receiving module 41 may be configured with a plurality of infrared receiving assemblies, and the plurality of infrared receiving assemblies may be arranged in an array to obtain a larger receiving angle, so as to receive the infrared control signals in each direction.

The infrared relay 40 receives the infrared control signal from the infrared remote controller 50, amplifies the infrared control signal, and generates an amplified infrared control signal. The amplification process of the infrared repeater 40 includes two layers, one is to amplify the signal strength to make the infrared control signal have larger power; secondly, the angle of the signal is amplified, so that the infrared control signal has a larger coverage angle.

Claims

1. An LED lamp illumination system, comprising:

the input end of the dimmer is electrically connected to the first external power supply input end and used for receiving an external power signal and generating a dimming signal; and

and the LED lamp is electrically connected to the first output end, the second output end and the second external power input end of the dimmer and used for receiving the dimming signal and adjusting the brightness or color temperature of the LED lamp.

2. The LED lamp lighting system of claim 1, wherein the LED lamp comprises:

the demodulation module is electrically connected to the dimmer and used for receiving the dimming signal and converting the dimming signal into a dimming control signal;

the LED driving module is electrically connected to the external power supply and the demodulation module and used for performing power supply conversion on an external power signal to generate a driving power supply and adjusting the driving power supply according to the received dimming control signal; and

and the LED module is electrically connected to the LED driving module and used for receiving the driving power supply and lightening the driving power supply.

3. The LED lamp lighting system of claim 2 wherein the dimmer comprises a first switch and a second switch, a first pin of the first switch being electrically connected to the first external power input, a second pin of the first switch being electrically connected to the LED driver module for operating as a switch of the LED lamp lighting system; the first pin of the second switch is electrically connected to the second pin of the first switch, and the second pin of the second switch is electrically connected to the demodulation module for generating a dimming signal.

4. The LED lamp lighting system of claim 3 wherein the first switch is a normally open switch; the second switch is a inching switch and is normally opened.

5. The LED lamp lighting system according to claim 2, wherein the dimmer comprises a first switch, a third switch, and a fourth switch, a first pin of the first switch is electrically connected to the first external power input terminal, a first pin of the third switch and a first pin of the fourth switch are electrically connected to the second pin of the first switch, a second pin of the third switch is electrically connected to the LED driving module and the demodulation module, and a second pin of the fourth switch is electrically connected to the LED driving module and the demodulation module.

6. The LED lamp lighting system of claim 5 wherein the third switch and the fourth switch are jog switches and are configured to be normally closed.

7. An LED lamp lighting system as claimed in claim 6 wherein the third switch and the fourth switch are arranged such that they cannot be turned off simultaneously.

8. An LED lamp illumination system, comprising:

the input end of the dimmer is electrically connected to the first external power supply input end and used for converting the received external power signal into a dimming power signal according to a dimming instruction, and the dimming power signal comprises dimming information; and

and the LED lamp is electrically connected to the output end of the dimmer and the input end of the second external power supply and is used for dimming according to the received dimming power signal.

9. The LED lamp lighting system of claim 8, wherein the external power signal is a mains ac signal, and the dimmer phase-cuts the external power signal according to the dimming command to generate the dimming power signal.

10. The LED lamp lighting system of claim 9 wherein the phase cut process has a phase cut angle of less than 90 degrees and the magnitude of the phase cut angle corresponds to the brightness of the LED lamp.

11. The LED lamp lighting system of claim 10 wherein the LED lamp brightness is unchanged when the amplitude of the external power signal changes at a certain phase cut angle.

12. The LED lamp lighting system of claim 8 wherein the dimmer comprises:

the dimming signal generation module is used for generating a dimming signal according to the received dimming instruction;

the zero-crossing detection module is electrically connected to the first external power supply input end and the second external power supply input end and used for detecting the zero-crossing point of the external power signal and generating a zero-crossing signal;

the data modulation module is electrically connected to the first external power supply input end and used for rectifying the external power signal and loading the dimming signal to the external power signal to generate the dimming power signal;

the filter circuit is electrically connected to the data modulation module and used for filtering the received rectified signal to generate a filtered signal;

the power supply module is electrically connected to the filter circuit and used for performing power supply conversion on the filtered signal to generate a power supply signal for the light modulator to be suitable; and

and the control module is electrically connected to the zero-crossing detection module and used for receiving the zero-crossing signal, starting data modulation at a specific time after the zero-crossing, and loading the dimming signal on the external power signal to generate the dimming power signal.

13. The LED lamp lighting system of claim 12, wherein the dimming signal generating module comprises a wireless remote controller and a signal receiving module, the wireless remote controller is configured to convert the dimming command into a wireless dimming signal, and the signal receiving module is configured to convert the wireless dimming signal into the dimming signal.

14. The LED lamp illumination system according to claim 12 or 13, wherein the dimming signal generation module comprises a light sensing module that generates the dimming signal according to an ambient light intensity.

15. The LED lamp illumination system of claim 12, wherein the data modulation module comprises a first diode, a second diode, a first zener diode, a first transistor, a second transistor, and a third transistor; the anode of the first diode is electrically connected to the external power input end and the first pin of the first transistor, and the cathode of the first diode is electrically connected to the cathode of the second diode and the cathode of the first voltage stabilizing diode;

the second pin of the first transistor is electrically connected with the second pin of the second transistor and is electrically connected to a first circuit node, and the third pin of the first transistor is electrically connected to the control module;

a first pin of the second transistor is electrically connected to an anode of the second diode and an output end of the dimmer, and a third pin of the second transistor is electrically connected to the control module; the first pin of the third transistor is electrically connected to the anode of the first zener diode, the second pin of the third transistor is electrically connected to the third pin of the second transistor, and the third pin of the third transistor is electrically connected to the control module.

16. The LED lamp lighting system of claim 15 wherein the external power signal is mains ac power, and the data modulation module comprises three phases of operation within an ac half-wave: a power phase, a power phase and a data phase.

17. The LED lamp lighting system of claim 16 wherein the external power signal powers the dimmer during the power phase, wherein the external power signal powers the LED lamp during the power phase, and wherein the dimmer loads the dimming signal onto the external power signal during the data phase to generate the dimming power signal.

18. The LED lamp lighting system of claim 16 wherein the first transistor and the second transistor are in an off state during the power phase.

19. The LED lamp lighting system of claim 16 wherein the first transistor and the second transistor are in a conductive state during the power phase.

20. The LED lamp lighting system of claim 16 wherein during the data phase, the first transistor and the second transistor operate in an amplification region and the third transistor is turned on intermittently.

21. The LED lamp lighting system of claim 8 further comprising a fault detection module electrically connected to the dimmer for fault detection by bypassing the dimmer.

22. The LED lamp lighting system of claim 21 wherein the fault detection module comprises a first switch electrically connected to the input and the output of the dimmer.

23. The LED lamp lighting system of claim 8 further comprising a sensor electrically connected to the dimmer and the LED lamp for changing a circuit state of the sensor based on an environmental variable.

24. The LED lamp lighting system of claim 23 wherein the environmental variable is ambient light intensity, whether a human or ambient sound is detected, or the like.

25. The LED lamp lighting system of claim 23 wherein the sensor comprises:

the rectifying circuit is electrically connected to an external power supply and used for rectifying the received external power signal to generate a rectified signal;

the filter circuit is electrically connected with the rectifying circuit and used for filtering the rectified signal to generate a filtered signal;

the power supply conversion circuit is electrically connected to the filter circuit and used for performing power supply conversion on the filtered signal to generate a low-voltage direct-current signal;

the switch device is electrically connected to a power supply loop of the LED lamp, namely is connected with the LED lamp in series and is used for switching on and off the power supply loop; and

and the sensor control module is electrically connected to the power conversion circuit and the switch device, is used for working by using the low-voltage direct current signal and controls the on-off of the switch device according to an environment variable.

26. The LED lamp lighting system of claim 25 wherein the rectifier circuit is a full bridge rectifier circuit.

27. The LED lamp lighting system of claim 25 wherein the filter circuit comprises a capacitor.

28. The LED lamp lighting system of claim 25 wherein the power conversion circuit is a dc buck power conversion circuit.

29. The LED lamp lighting system of claim 25 wherein the switching device is a field effect transistor or a relay.

30. An infrared repeater, comprising:

the infrared signal receiving module is used for receiving an infrared control signal;

the infrared signal amplification module is electrically connected to the infrared signal receiving module and is used for amplifying the infrared control signal; and

and the infrared signal transmitting module is electrically connected to the infrared signal amplifying module and is used for transmitting the amplified infrared control signal.

31. The infrared repeater as recited in claim 30, wherein said infrared signal emitting module comprises a plurality of infrared emitting modules, said infrared emitting modules being arranged in an array.

32. The infrared repeater as recited in claim 30, wherein said infrared signal receiving module comprises a plurality of infrared receiving elements, said infrared receiving elements being arranged in an array.

33. The infrared repeater as recited in claim 30, wherein said infrared repeater is powered using a battery or mains electricity.

34. The infrared repeater as claimed in claim 30, wherein the infrared signal receiving module comprises an infrared receiving probe, a first pin of the infrared receiving probe is electrically connected to a power terminal, and a third pin of the infrared receiving probe is electrically connected to a common ground terminal; the infrared emission module comprises a first infrared light-emitting diode; the infrared amplification module comprises a first capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor, a first triode, a second triode and a third triode, as well as a first field effect transistor, wherein a second pin of the first capacitor is electrically connected to the common ground terminal, the first resistor and the first capacitor are connected in parallel, a first pin of the second resistor is electrically connected to a first pin of the first capacitor, a second pin of the second resistor is electrically connected to a first pin of the first triode, a second pin of the first triode is electrically connected to a second pin of the third resistor, a third pin of the first triode is electrically connected to the common ground terminal, a first pin of the third resistor is electrically connected to the power supply terminal, a first pin of the second triode and a first pin of the third triode are electrically connected and are electrically connected to a second pin of the first triode and a first pin of the fourth resistor, the second pin of the fourth resistor is electrically connected to a common ground terminal, the second pin of the second triode is electrically connected to the power supply terminal, the third pin of the second triode is electrically connected to the second pin of the third triode, the third pin of the third triode is electrically connected to the common ground terminal G, the first pin of the fifth resistor is electrically connected to the third pin of the second triode, the second pin of the fifth resistor is electrically connected to the first pin of the field first effect transistor, the second pin of the first field effect transistor is electrically connected to the cathode of the first infrared light-emitting diode, the third pin of the first field effect transistor is electrically connected to the common ground terminal, the first pin of the sixth resistor is electrically connected to the power supply terminal, and the second pin of the sixth resistor is electrically connected to the anode of the first infrared light-emitting diode.

35. An LED lamp is characterized by comprising a driving circuit, an LED module and a demodulation module, wherein the demodulation module is electrically connected to an external power supply and used for generating a dimming control signal according to dimming information contained in an external power signal; the driving circuit is electrically connected to an external power supply and the demodulation module, and is used for performing power conversion on a received external power signal to generate a driving power supply and adjusting the driving power supply according to the dimming control signal; the LED module is electrically connected to the driving circuit and used for receiving the driving power supply to light.

36. The LED lamp of claim 35, wherein the external power signal is a dc signal.

37. The LED lamp of claim 35, further comprising a rectifying circuit and a filtering circuit, the rectifying circuit being electrically connected to an external power source for rectifying an external power signal to generate a rectified signal; the filter circuit is electrically connected to the rectifying circuit and is used for filtering the rectified signal to generate a filtered signal; the filtered signal is provided to a driver circuit.

38. The LED lamp of claim 37, wherein the filter circuit comprises a capacitor.

39. The LED lamp of claim 37, wherein the rectifier circuit is a full bridge rectifier circuit.

40. The LED lamp of claim 35, wherein the driver circuit is a buck dc converter circuit.