CN108990201B - Wall-control LED lamp low-harmonic dimming method - Google Patents
Wall-control LED lamp low-harmonic dimming method Download PDFInfo
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- CN108990201B CN108990201B CN201810591943.4A CN201810591943A CN108990201B CN 108990201 B CN108990201 B CN 108990201B CN 201810591943 A CN201810591943 A CN 201810591943A CN 108990201 B CN108990201 B CN 108990201B
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Abstract
A wall control LED lamp low harmonic dimming method is realized by a device consisting of a wall control switch unit and an LED lamp adjusting drive unit, when the brightness is changed, the wall control switch unit sends a brightness control signal which is controlled by phase shift trigger and consists of a guide waveform and a data waveform to the LED lamp adjusting drive unit, and in the data waveform, the brightness grade is represented by the number of continuous single-phase sine half waves with specific phase shift angle; the LED lamp adjusting and driving unit changes the brightness of the LED lamp according to brightness data in the brightness control signal, and when the LED lamp is in a lighting state and does not send the brightness control signal, the voltage waveform on the single live wire is a continuous and complete single-phase sine wave. The LED lamp dimming method does not need a remote controller, does not need to lay a control line independently, does not need to lay a power line again, and can realize the replacement and upgrade of a common illuminating lamp.
Description
The invention discloses a wall-control LED lamp low-harmonic dimming method, which is applied by divisional application, has the original application number of 201510229126.0, and has the application date of 2015, 5 and 8.
Technical Field
The invention relates to a lighting lamp technology, in particular to a single-live-wire low-harmonic dimming method of a wall-control LED lamp.
Background
Due to the non-linear characteristic of the LED lamp, the brightness of the LED lamp cannot be realized by adjusting the voltage.
When the controllable constant current source is used for adjusting the brightness of the LED lamp, the change of the working current can bring the color spectrum offset of the LED lamp, and meanwhile, the load current of the LED lamp under low brightness also becomes very low, so that the efficiency of the controllable constant current source is reduced, the temperature rise is increased, the power consumption of the loss on the driving chip is higher, and the service lives of the constant current source and the LED light source can be damaged.
The LED lamp brightness is controlled by adopting a PWM (pulse width modulation) dimming mode, so that the problems caused by a voltage regulating mode and a current regulating mode can be avoided. Currently, there are three common dimming methods for LED lamps:
firstly, the remote controller is adopted for control. The LED lamp control circuit is provided with a remote controller receiving device, and can carry out step dimming or stepless dimming on the LED lamp through the remote controller.
And secondly, adopting a digital control technology. For example, with DALI (digitally addressable lighting interface) technology, DALI system software can address individual or multiple LED fixtures on the same strong power circuit or on different circuits, with precise dimming and on-off control of individual lamps or arbitrary groups of lamps by the DALI system software. The technical scheme is advanced, but the cost is high, and the system needs to be provided with control lines besides power lines.
Thirdly, a single live wire switch on-off control technology is adopted. For example, by using the NU102 dedicated chip, the brightness of the LED lamp can be adjusted by using the switching action of a common wall switch within a predetermined time. However, the method can only provide the brightness adjustment of the 4-gear LED lamp, and the switching action has time requirements.
Disclosure of Invention
The invention aims to provide a method for dimming an LED lamp by using a single live wire without changing the wiring of the existing lighting line.
In order to achieve the purpose, the invention adopts the technical scheme that: a wall-control LED lamp low-harmonic dimming method is realized by a device consisting of a wall-control switch unit and an LED lamp adjusting and driving unit, wherein the wall-control switch unit is provided with a single-live-wire input end and a single-live-wire output end, and the single-live-wire input end is connected to an alternating-current power supply live wire; the LED lamp adjusting and driving unit is provided with a live wire input end and a zero line input end, wherein the live wire input end is connected to the single live wire output end of the wall control switch unit, and the zero line input end is connected to an alternating current power supply zero line.
The wall control switch unit is composed of a single-live-wire power supply module, a single-chip microcomputer control module, a phase-shifting driving module, a zero-crossing detection module and a brightness giving module.
The wall control switch unit sends a brightness control signal by controlling the voltage waveform output by the single live wire output end, wherein the brightness control signal comprises a guide waveform and a data waveform; the guide waveform consists of a non-conductive negative half-wave followed by a fully conductive positive half-wave; the leading waveform is either comprised of one complete cycle that is non-conducting, followed by one complete positive half-wave that is conducting.
The data waveform is composed of continuous K single-phase sine half waves with phase shift angles of alpha, the brightness level of the brightness control signal sent by the data waveform is brightness K, and K is an integer greater than or equal to 1 and less than or equal to 9.
The single-live-wire power supply module has a single-live-wire off-state power taking function and an on-state power taking function and is used for providing a working power supply for the wall control switch unit.
The zero-crossing detection module is a half-wave rectification voltage division circuit, can detect a zero-crossing signal of the alternating current power supply and provides the zero-crossing signal to the single-chip microcomputer control module. The zero-crossing detection module can detect the zero-crossing signal of the alternating current power supply, and means that the zero-crossing detection module is matched with the single-chip microcomputer control module and the phase-shifting driving module together to complete the detection of the zero-crossing signal of the alternating current power supply. The zero-crossing detection module consists of a diode D2, a resistor R4, a resistor R5 and a voltage stabilizing tube DW 1; two ends of the resistor R4 are respectively connected to the cathode of the diode D2 and the cathode of the voltage regulator tube DW 1; the anode of the diode D2 is connected to the single live wire output end; the anode of the voltage stabilizing tube DW1 is connected to the analog ground of the wall-controlled switch unit; the resistor R5 is connected in parallel at two ends of the voltage stabilizing tube DW 1; the zero crossing signal is output from the cathode of the stabilivolt DW 1.
The brightness giving module can provide the brightness level of the brightness control signal to the single chip microcomputer control module.
The phase-shift driving module is a bidirectional thyristor alternating-current phase-shift circuit. The singlechip control module is provided with a trigger signal output end; the trigger signal input end of the phase-shifting driving module is connected to the trigger signal output end of the singlechip control module; the phase-shift driving module consists of a bidirectional thyristor V1, a thyristor output optocoupler, a resistor R1, a resistor R2 and a resistor R3; two anode ends of the bidirectional thyristor V1 are respectively connected to the single live wire output end and the alternating voltage end of the single live wire voltage stabilizer; the resistor R1 is connected in parallel with the two anode ends of the bidirectional thyristor V1; the output thyristor of the thyristor output optocoupler is connected in series with a resistor R2, and a series branch of the output thyristor is connected to a first anode and a control electrode of the bidirectional thyristor V1; an input light emitting diode of the silicon controlled output optocoupler is connected with a resistor R3 in series, one end of a series branch of the input light emitting diode is connected to a direct current working power supply, and the other end of the series branch is a trigger signal input end; one anode of the bidirectional thyristor V1 is a single-live-wire output end, and the other anode is connected to the single-live-wire input end through a single-live-wire power supply module; the single live wire input end is the analog ground of the wall-control switch unit.
The single-chip microcomputer control module sends a trigger signal to control the phase-shifting driving module to supply power to the LED lamp adjusting driving unit and sends a brightness control signal to the LED lamp adjusting driving unit according to the brightness grade of the brightness control signal.
When the singlechip control module sends out a brightness control signal, the trigger signal output is stopped randomly; when the moment of stopping outputting the trigger signal is in the positive half-wave period of the alternating-current power supply, the bidirectional thyristor in the phase-shifting driving module is not conducted in the next negative half-wave period of the alternating-current power supply, the zero-crossing detection module outputs a zero-crossing signal in the next negative half-wave period of the alternating-current power supply, and the zero-crossing signal is a positive pulse corresponding to the non-conducted negative half-wave period of the alternating-current power supply; when the moment of stopping the output of the trigger signal is in the negative half-wave period of the alternating-current power supply, the bidirectional thyristor in the phase-shifting driving module is not conducted in the next positive half-wave of the alternating-current power supply and the next negative half-wave of the alternating-current power supply, the zero-crossing detection module does not output a zero-crossing signal in the non-conducted positive half-wave of the alternating-current power supply, and the zero-crossing signal is a positive pulse corresponding to the next negative half-wave of the alternating-current power supply; taking the positive pulse falling edge of the zero-crossing signal as a zero-crossing timing starting point, and taking the position of 10ms as a calculation starting point 0 degree point of a phase shift angle alpha of the 1 st single-phase sine half-wave in the data waveform; the 20ms is the triggering time of the phase shift angle alpha of the 2 nd single-phase sine half-wave in the data waveform, namely the 20ms is the calculation starting point 0 degree point of the phase shift angle alpha of the 2 nd single-phase sine half-wave in the data waveform; and so on, the phase shift angle alpha of the Kth single-phase sine half wave in the data waveform is calculated to be at the K multiplied by 10ms from the starting point of 0 degree.
The zero crossing signal is a positive pulse of approximately 10 ms.
The method for sending out the data waveform is that at the triggering moment of the phase shift angle alpha of each single-phase sine half-wave of the data waveform, the single-chip microcomputer control module sends out a narrow triggering pulse.
When the LED lamp is in a closed state, the single-chip microcomputer control module stops outputting the trigger signal.
The method for sending the brightness control signal by the wall control switch unit comprises the following steps:
step A, judging whether the LED lamp is turned off, if so, turning off the LED lamp, and turning to step C; otherwise, turning to the step B;
step B, sending out a primary brightness control signal;
step C, judging whether the brightness level of the brightness control signal is changed or not, changing the brightness level, and returning to the step A; the brightness level is not changed, the state of not sending out the brightness control signal is maintained, the step C is returned,
The state of not sending out the brightness control signal is maintained, and when the LED lamp is in the off state, micro-current flows through the output end of the single live wire; the LED lamp is maintained in a state of not sending out a brightness control signal, and when the LED lamp is in a lighting state, the voltage waveform output by the output end of the single live wire is a continuous and complete single-phase sine wave.
The LED lamp adjusting and driving unit is composed of a single chip microcomputer adjusting module and an LED driving module.
The LED driving module is provided with an alternating current input end and an LED lamp driving end, wherein the alternating current input end is connected to the live wire input end and the zero line input end of the LED lamp adjusting driving unit, and the LED lamp driving end is connected to the LED lamp; the LED driving module is also provided with a PWM brightness adjusting signal input end.
The single chip microcomputer adjusting module comprises an adjusting single chip microcomputer, a positive half-wave rectification and shaping circuit, a negative half-wave rectification and shaping circuit and a rectification and voltage stabilizing circuit, and is provided with an alternating current input end and a PWM brightness adjusting signal output end; the alternating current input end is connected to the live wire input end and the zero line input end of the LED lamp adjusting driving unit, and the PWM brightness adjusting signal output end is connected to the PWM brightness adjusting signal input end of the LED driving module; the positive half-wave rectification and shaping circuit and the negative half-wave rectification and shaping circuit respectively carry out positive half-wave rectification and shaping and negative half-wave rectification and shaping on the alternating voltage input by the live wire input end; and the output of the positive half-wave rectification and shaping circuit and the output of the negative half-wave rectification and shaping circuit are respectively connected to different pulse capture input ends of the regulating singlechip.
The LED lamp adjusting and driving unit receives the brightness control signal and controls the brightness through the single chip microcomputer adjusting module, and the method comprises the following steps:
initializing, namely controlling an LED lamp to be initial brightness;
judging whether a single live wire has a brightness control signal or not; if no brightness control signal exists, returning to the step two; if the brightness control signal exists, turning to the third step;
step three, receiving a brightness control signal and determining the brightness level;
step four, changing the brightness of the LED lamp; and returning to the step two.
The method for judging whether the single live wire has the brightness control signal is to judge whether the single live wire has the guide waveform of the brightness control signal.
Receiving a brightness control signal and determining the brightness grade by judging the number of single-phase sine half-waves with phase shift angle alpha in the data waveform; there are continuous K single-phase sine half-waves with phase shift angle alpha, and the brightness level of the brightness control signal is brightness K.
The LED lamp brightness is changed by changing the duty ratio of a PWM brightness adjusting signal connected to the LED lamp adjusting driving unit through the single chip microcomputer adjusting module.
The method for judging whether the single live wire has the guide waveform of the brightness control signal comprises the steps of judging whether the waveform output by the negative half-wave rectification and shaping circuit has negative half-wave pulse loss and judging whether the waveform output by the subsequent positive half-wave rectification and shaping circuit has a complete positive half-wave waveform.
The alternating current power supply is single-phase 220V alternating current.
The phase shift angle α is 30 °.
The method for judging whether the single live wire has the guide waveform of the brightness control signal comprises the steps of judging whether the waveform output by the negative half-wave rectification and shaping circuit has negative half-wave pulse loss and judging whether the waveform output by the subsequent positive half-wave rectification and shaping circuit has a complete positive half-wave waveform.
The method for judging the number of single-phase sine half waves with the phase shift angle alpha in the data waveform comprises the steps of judging the number of pulses with the pulse width of 180-alpha in the waveform output by the negative half-wave rectification and shaping circuit and the positive half-wave waveform output by the positive half-wave rectification and shaping circuit after the waveform is guided.
The invention has the advantages of providing a method for forming the wall control switch unit which is connected in series on a single live wire, generates and sends out phase shift waveforms with controllable phase shift angles, can control the brightness of the LED lamp and has brightness grade brightness control signals, and also providing a method for detecting zero-crossing signals and determining the 0-degree point of the starting point of phase shift angle calculation on the single live wire. The method adopts a single live wire mode to control the brightness of the LED lamp, does not need a remote controller, does not need a control wire, does not need to lay a power line again, and can realize the replacement and upgrade of the common illuminating lamp; the brightness adjustment of the LED lamp is divided into 9 grades, and is adjusted by a knob device, so that the operation habit is met; the brightness control signal on the single live wire is only sent in a short time when the brightness is changed, and when the LED lamp is in a lighting state and does not send the brightness control signal, the voltage waveform output by the output end of the single live wire is a continuous and complete single-phase sine wave without harmonic waves; the lamp has the function of turning off the lamp by the single-live-wire electronic switch. The technical means of acquiring the trigger synchronous signal of the alternating current power supply on the single live wire adopted in the wall control switch unit does not increase the voltage waveform output on the single live wire.
Drawings
Fig. 1 is a block diagram of a system configuration.
Fig. 2 is a structural view of a wall-control switch unit.
Fig. 3 is a circuit diagram of an embodiment of a wall-controlled switch cell.
Fig. 4 is an alpha angle diagram of a data waveform.
Fig. 5 is a diagram showing an example of a waveform for transmitting a luminance level 3.
Fig. 6 is a diagram showing an example of a waveform for transmitting a brightness level 2.
Fig. 7 is a luminance control signal transmission control method.
Fig. 8 is a structural view of an LED lamp adjustment driving unit.
FIG. 9 is a circuit diagram of an embodiment of a single chip microcomputer adjusting module.
Fig. 10 is a circuit diagram of an embodiment of an LED driving module.
Fig. 11 is a brightness control adjustment method.
Detailed Description
The present invention will be described in further detail below with reference to examples by way of drawings, but the embodiments of the present invention are not limited thereto.
The device for realizing the method of the invention is shown in figure 1 and consists of a wall control switch unit and an LED lamp adjusting and driving unit which are connected in series. And the wall control switch unit is connected with a single live wire AC in and a single live wire AC1 out. The LED lamp adjusts the live wire AC1 of the driving unit to enter, and the zero wire N to exit.
The structure of the wall control switch unit is shown in fig. 2, and the wall control switch unit is composed of a single-live-wire power supply module, a single-chip microcomputer control module, a phase-shifting driving module, a zero-crossing detection module and a brightness giving module. The single-live-wire power supply module has a single-live-wire off-state power taking function and an on-state power taking function and is used for providing a working power supply for the wall control switch unit.
The alternating current power supply zero-crossing signal detected by the zero-crossing detection module is sent to the single chip microcomputer control module, and the brightness giving module provides the brightness level of the brightness control signal to the single chip microcomputer control module. The single-chip microcomputer control module controls the phase-shifting driving module to supply power to the LED lamp adjusting driving unit according to the brightness grade of the brightness control signal and sends the brightness control signal to the LED lamp adjusting driving unit.
An example circuit of a wall-controlled switch cell is shown in fig. 3.
The single live wire power supply module consists of a single live wire voltage stabilizer U1 and a peripheral element diode D1 thereof, a capacitor C1, a capacitor C2, an inductor L1 and an inductor L2, and a low dropout voltage stabilizer U2 and a peripheral element capacitor C3 and a capacitor C4 thereof. The single live wire regulator U1 is of the type MP-6V-02S, and the low dropout regulator U2 is of the type HT 7333.
The single live wire input end AC is the analog ground of the wall-control switch unit and is connected to the alternating voltage common end COM of the single live wire voltage stabilizer U1; two ends of the capacitor C1 are respectively connected to the filter capacitor input end FIL and the alternating voltage common end COM of the single-live wire voltage stabilizer U1; the GND end of the direct-current output voltage of the single-live-wire voltage stabilizer U1 is a digital ground of the wall-control switch unit, and two ends of the inductor L2 are respectively connected to the digital ground and an analog ground of the wall-control switch unit; the diode D1, the inductor L1 and the capacitor C2 form a half-wave rectification filter circuit, the input of the half-wave rectification filter circuit is connected to the single live wire output end AC1, and the output of the half-wave rectification filter circuit is connected to the direct-current high-voltage input end HDC of the single live wire voltage stabilizer U1. The single live wire voltage regulator U1 is further provided with a dc voltage output terminal VCC and an AC voltage terminal AC.
An input end VIN of the low dropout regulator U2 is connected to a direct-current voltage output end VCC of the single live wire regulator U1, and an output end VOUT outputs a +3.3V direct-current working power supply VDD; the ground terminal GND of the single live wire voltage regulator U1 is connected to the digital ground of the wall-control switch unit; the capacitor C3 and the capacitor C4 are filter capacitors for the input voltage and the output voltage of the low dropout regulator U2, respectively.
The phase-shift driving module is a bidirectional thyristor alternating-current phase-shift circuit and consists of a bidirectional thyristor V1, a thyristor output optocoupler U3, a resistor R1, a resistor R2 and a resistor R3, wherein the thyristor output optocoupler U3 is MOC3023 in model number. Two anode ends of the bidirectional thyristor V1 are respectively connected to a single live wire output end AC1 and an alternating voltage end AC of the single live wire voltage stabilizer U1; the resistor R1 is connected in parallel with the two anode ends of the bidirectional thyristor V1; the output thyristor of the thyristor output optocoupler U3 is connected in series with the resistor R2, and the series branch of the thyristor output optocoupler U3 is connected to the first anode and the control electrode of the bidirectional thyristor V1; an input light emitting diode of the thyristor output optocoupler U3 is connected in series with the resistor R3, one end of a series branch of the thyristor output optocoupler U3 is connected to a direct-current working power supply VDD, and the other end of the series branch is a trigger signal input end.
The zero-crossing detection module is a half-wave rectification voltage division circuit and consists of a diode D2, a resistor R4, a resistor R5 and a voltage stabilizing tube DW 1. Two ends of the resistor R4 are respectively connected to the cathode of the diode D2 and the cathode of the voltage regulator tube DW 1; the anode of the diode D2 is connected to the single live wire output end AC 1; the anode of the voltage stabilizing tube DW1 is connected to the analog ground of the wall-controlled switch unit; and the resistor R5 is connected in parallel at two ends of the voltage stabilizing tube DW 1. The zero crossing signal is output from the cathode of the stabilivolt DW 1.
The brightness giving module is a BCD rotary encoder SW1 and outputs a BCD code 0000-.
The brightness setting module can also adopt a potentiometer to divide the direct current working power supply VDD and output the brightness setting voltage within the range of 0-3.3V. The luminance given voltage of 0-3.3V output from the potentiometer was divided into 10 sections on average, the lowest voltage section corresponding to the code 0000 of the BCD rotary encoder SW1, and the highest voltage section corresponding to the code 1001 of the BCD rotary encoder SW 1.
The singlechip control module comprises a control singlechip U4 and a crystal oscillator XT 1. The model of the control single chip microcomputer U4 is MSP430G 2553. The zero-crossing signal is input from P2.0 of the control single chip microcomputer U4, the trigger signal is output from P1.1 of the control single chip microcomputer U4, and the BCD code of the brightness given module is input from P2.4-P2.1. If the brightness giving module adopts a potentiometer, the output voltage of the potentiometer is connected to the analog voltage input end A0(P1.0) of the control singlechip U4. The control singlechip U4 obtains the brightness level of the brightness control signal as brightness 0-9 by reading BCD codes input by P2.4-P2.1 or performing A/D conversion on the brightness given voltage input by the analog voltage input end A0.
The wall accuse switch element sends the luminance control signal through the voltage waveform of control single live wire output AC1 output, and when the wall accuse switch element maintained not to send the luminance control signal state, the single chip microcomputer control module lastingly exported low level trigger signal, and bidirectional thyristor V1 lasts and switches on except the zero crossing point, and the voltage waveform of single live wire output AC1 output is continuous complete single-phase sine wave.
When the wall control switch unit needs to send out a primary brightness control signal, the waveform of the primary brightness control signal consists of a guide waveform and an adjacent data waveform; the guide waveform consists of a non-conductive negative half-wave followed by a fully conductive positive half-wave; the leading waveform may also consist of one complete cycle that is non-conducting, followed by one complete positive half-wave that is conducting. The brightness control signal is sent once, including sending out a leading waveform followed by sending out a data waveform.
The data waveform is composed of continuous K single-phase sine half waves with phase shift angles of alpha, the brightness level of the brightness control signal sent by the data waveform is brightness K, and K is an integer greater than or equal to 1 and less than or equal to 9.
Fig. 4 is a schematic diagram showing an angle α of a data waveform. Fig. 5 shows an exemplary waveform diagram of a primary brightness control signal with a brightness level of brightness 3, where (a) in fig. 5 is a brightness control signal voltage waveform output from the single hot line output AC1, (b) in fig. 5 is a zero-crossing signal voltage waveform, (c) in fig. 5 is a brightness control signal negative half-wave rectification shaped voltage waveform, and (d) in fig. 5 is a brightness control signal positive half-wave rectification shaped voltage waveform.
When the single-live wire output end AC1 outputs continuous and complete single-phase sine waves, the voltage difference between the single-live wire output end AC1 and the single-live wire input end AC is very small, the zero-crossing detection module cannot output a zero-crossing signal, and the zero-crossing signal is maintained in a low level state.
And when the singlechip control module needs to send the brightness control signal once, the trigger signal output is stopped randomly. When the moment of stopping outputting the trigger signal is in the positive half-wave period of the alternating current power supply, the positive half-wave bidirectional thyristor V1 is already conducted, the next negative half-wave bidirectional thyristor V1 is not conducted, the zero-crossing detection module outputs a zero-crossing signal in the whole negative half-wave, the zero-crossing signal is a positive pulse, and the pulse 1 width is close to 10ms as shown in the pulse 1 in fig. 5. The single chip microcomputer control module sends a trigger pulse which is not more than 10ms at the falling edge of the pulse 1 to control the conduction of the next positive half-wave of the bidirectional thyristor V1, the pulse 2 is the voltage waveform of the rectified and shaped corresponding positive half-wave, and the width of the pulse 2 is close to 10 ms. The phase shift angle alpha triggering time of each single-phase sine half-wave of the data waveform is obtained by using the falling edge of the zero-crossing signal as a timing starting point and sequentially delaying and timing. Let t be the phase shift time corresponding to the phase shift angle α, where t is α × 10/180 ms; taking the falling edge of the pulse 1 as a timing starting point, and taking the 10ms + t position as the triggering time of the phase shift angle alpha of the 1 st single-phase sine half-wave in the data waveform, namely taking the 10ms position as the zero-crossing synchronization point of the phase shift angle alpha of the 1 st single-phase sine half-wave in the data waveform; the 20ms + t position is the phase shift angle alpha triggering time of the 2 nd single-phase sine half-wave in the data waveform, namely the 20ms position is the zero-crossing synchronization point of the phase shift angle alpha of the 2 nd single-phase sine half-wave in the data waveform; and so on, the triggering time of the phase shift angle α of the kth single-phase sinusoidal half-wave in the data waveform is at K × 10ms + t, i.e., the zero-crossing synchronization point of the phase shift angle α of the kth single-phase sinusoidal half-wave in the data waveform is at K × 10 ms. The value of K in fig. 5 is 3.
When the singlechip control module needs to send a brightness control signal once and the moment of randomly stopping the output of the trigger signal is in the negative half-wave period of the alternating-current power supply, the negative half-wave bidirectional thyristor V1 is already conducted, and the next positive half-wave bidirectional thyristor V1 is not conducted, but the positive half-wave bidirectional thyristor V1 is not conducted because the zero-crossing detection module adopts half-wave rectification, and the zero-crossing detection module cannot output a zero-crossing signal; until the next negative half-wave bidirectional thyristor V1 is not conducted, the zero-crossing detection module outputs a zero-crossing signal in the whole negative half-wave, and the zero-crossing signal is a positive pulse. For example, as shown in fig. 6, (a) in fig. 6 is a voltage waveform of the luminance control signal output from the single live line output terminal AC1, (b) in fig. 6 is a voltage waveform of the zero-crossing signal, (c) in fig. 6 is a voltage waveform of the luminance control signal after negative half-wave rectification and shaping, and (d) in fig. 6 is a voltage waveform of the luminance control signal after positive half-wave rectification and shaping. The pulse 7 in fig. 6 is a zero crossing signal with a width of approximately 10 ms. The single chip microcomputer control module sends out a trigger pulse which is not more than 10ms at the falling edge of the pulse 7 to control the conduction of the next positive half-wave of the bidirectional thyristor V1, the pulse 8 is the voltage waveform of the rectified and shaped corresponding positive half-wave, and the width of the pulse 8 is close to 10 ms. Taking the falling edge of the pulse 7 as a timing starting point, the 10ms + t position is the phase shift angle alpha triggering time of the 1 st single-phase sine half-wave in the data waveform, the 20ms + t position is the phase shift angle alpha triggering time of the 2 nd single-phase sine half-wave in the data waveform, and so on, and the phase shift angle alpha triggering time of the Kth single-phase sine half-wave in the data waveform is at the K multiplied by 10ms + t position. The value of K in fig. 6 is 2.
At the triggering moment of the phase shift angle alpha of each single-phase sine half-wave of the data waveform, the single-chip microcomputer control module sends out a narrow triggering pulse to control the conduction of the bidirectional thyristor V1; the width of the narrow trigger pulse does not exceed the angle 180-alpha or is time 10 ms-t. A typical value for a narrow trigger pulse width is 1ms and a typical value for the phase shift angle alpha is 30 deg..
When the brightness level of the brightness control signal is 0, the single-chip microcomputer control module stops outputting the trigger signal, the bidirectional thyristor V1 is turned off, the LED lamp is turned off, and micro current flows through the single-live-wire output end AC 1.
Fig. 7 shows a method for controlling the sending of the brightness control signal, which is implemented by a program in the single chip microcomputer control module, and the method comprises the following steps: step A, judging whether the LED lamp is turned off, if so, turning off the LED lamp, and turning to step C; otherwise, turning to the step B;
step B, sending out a brightness control signal for one time, including sending out a guide waveform and then sending out a data waveform;
step C, judging whether the brightness level of the brightness control signal is changed or not, changing the brightness level, and returning to the step A; the brightness level is not changed and the process returns to step C.
When the wall control switch unit does not send out a brightness control signal and the LED lamp is in a lighting state, the voltage waveform output by the single live wire output end AC1 is a continuous and complete single-phase sine wave.
The LED lamp adjusting driving unit is structurally shown in fig. 8 and comprises a single chip microcomputer adjusting module and an LED driving module, and alternating current input ends of the single chip microcomputer adjusting module and the LED driving module are connected to a live wire input end AC1 and a zero line input end N.
The LED driving module is used for driving the LED lamp to be lightened, and all the LED driving modules provided with the PWM brightness adjusting signal input end are suitable for the LED lamp driving device.
The single chip microcomputer adjusting module is provided with a PWM brightness adjusting signal output end and is connected to a PWM brightness adjusting signal input end of the LED driving module.
The embodiment circuit of the singlechip adjusting module is shown in fig. 9.
In the embodiment shown in fig. 9, the single chip microcomputer adjusting module is composed of an adjusting single chip microcomputer U5, a diode D3, a diode D4, a diode D5, a diode D6, a diode D7, a diode D8, a voltage regulator DW2, a voltage regulator DW3, a voltage regulator DW4, a resistor R6, a resistor R7, a resistor R8, a capacitor C5, and a crystal oscillator XT 2.
The diode D3, the cathode of the diode D4, the diode D5, the diode D6, the capacitor C5, the resistor R6 and the voltage regulator DW2 form a rectification voltage-stabilizing circuit and provide power for the regulating singlechip U5.
The diode D8, the resistor R8 and the voltage regulator tube DW4 form a negative half-wave rectification shaping circuit, and negative half-wave waveforms obtained on the voltage regulator tube DW4 are shown in fig. 5 (c) and fig. 6 (c); the diode D7, the resistor R7, and the voltage regulator tube DW3 constitute a positive half-wave rectification shaping circuit, and positive half-wave waveforms obtained on the voltage regulator tube DW3 are shown in fig. 5 (D) and fig. 6 (D). The positive half-wave rectification shaping circuit and the negative half-wave rectification shaping circuit respectively carry out positive half-wave rectification shaping and negative half-wave rectification shaping on alternating voltage input by the live wire input end AC 1. The output of the positive half-wave rectification and shaping circuit and the output of the negative half-wave rectification and shaping circuit are respectively connected to a capture comparison input end P2.0 and a comparison input end P2.1 of the regulating single chip microcomputer U5.
The regulating single chip microcomputer U5 is MSP430G2553, and its PWM output end P1.2 is the PWM brightness regulating signal output end. The power supply negative input terminal VSS of the regulating single-chip microcomputer U5 is connected to the common reference ground.
The LED driving module is used for driving the LED lamp to light, and the LED driving module provided with the PWM brightness adjustment signal input terminal may be applied to the present invention, and fig. 10 shows only one embodiment of the circuit.
In fig. 10, the LED driving module includes an LED driver U6, a diode D9, a diode D10, a diode D11, a diode D12, a capacitor C6, a capacitor C7, a capacitor C8, an inductor L3, a fast recovery diode D13, a switch tube VD, a resistor R9, and a resistor R10. LED driver U6 is model HV 9910.
In fig. 10, a diode D9, a diode D10, a diode D11, and a diode D12 constitute a single-phase bridge rectifier circuit. 2 alternating current input ends of the single-phase bridge rectifier circuit are respectively connected to a live wire input end AC1 and a zero wire input end N, a direct current output negative end is connected to a common reference ground, and a direct current output positive end is connected to the anode of a capacitor C6, one end of a capacitor C7, a power input end VIN of an LED driver U6, one end of an inductor L3 and the cathode of a fast recovery diode D13. The ground input GND of the LED driver U6 is connected to a common reference ground. The cathode of the capacitor C6 and the other end of the capacitor C7 are connected to a common reference ground. The anode of the fast recovery diode D13 is connected with the drain of the switch tube VD and then is used as the negative polarity connection end LED of the high-power LED lamp, and the other end of the inductor L3 is used as the positive polarity connection end LED + of the high-power LED lamp. The source electrode of the switch tube VD is connected with one end of a resistor R9 and then is connected to the LED current detection end CS of the LED driver U6; the other end of resistor R9 is connected to a common reference ground. The grid electrode of the switch tube VD is connected to the driving end GATE of the LED driver U6; resistor R10 has one end connected to the oscillation frequency control terminal RT of LED driver U6 and the other end connected to a common reference ground. The anode of the capacitor C8 is connected to the control voltage output terminal VDD and the linear current control terminal LD of the LED driver U6, and the cathode is connected to the common reference ground. An enable control terminal PWM _ D of the LED driver U6 is the PWM brightness adjustment signal input terminal.
The LED lamp adjusting driving unit receives the brightness control signal and controls the brightness by the single chip adjusting module, as shown in fig. 11, the method is,
initializing, namely controlling an LED lamp to be initial brightness;
judging whether a single live wire has a brightness control signal or not; if no brightness control signal exists, returning to the step two; if the brightness control signal exists, turning to the third step;
step three, receiving a brightness control signal and determining the brightness level;
and step four, changing the brightness of the LED lamp, and returning to the step two.
The initial brightness may be set to any one of 9 different brightnesses, for example, to brightness 1.
And judging whether the single live wire has the brightness control signal or not by judging whether the single live wire has the guide waveform of the brightness control signal or not. Under normal conditions, the voltage waveform input by the live wire input end AC1 is a continuous and complete single-phase sine wave, and the waveform output by the negative half-wave rectification shaping circuit is a rectangular wave with the period of 20ms and the pulse width of nearly 10 ms. When the wall-control switch unit sends the brightness control signal once, the guiding waveform thereof causes the absence of a negative half-wave, such as the absence of a negative half-wave pulse at the position corresponding to (c) pulse 1 in fig. 5 and (b) pulse 7 in fig. 6. The single chip microcomputer adjusting module judges that the waveform output by the negative half-wave rectification and shaping circuit has negative half-wave pulse loss, the waveform of the positive half-wave output by the following positive half-wave rectification and shaping circuit is complete, the corresponding positive half-wave pulse is pulse 2 in figure 5 or pulse 8 in figure 6, and the guiding waveform with the brightness control signal on the single live wire can be judged.
Receiving a brightness control signal and determining the brightness grade by judging the number of single-phase sine half-waves with phase shift angle alpha in the data waveform; there are continuous K single-phase sine half-waves with phase shift angle alpha, and the brightness level of the brightness control signal is brightness K. The negative half-wave rectification and shaping voltage waveform of the brightness control signal output by the negative half-wave rectification and shaping circuit is shown as (c) in fig. 5 and (c) in fig. 6 and is connected to the regulating singlechip; the positive half-wave rectification and shaping voltage waveform of the brightness control signal output by the positive half-wave rectification and shaping circuit is shown as (d) in fig. 5 and (d) in fig. 6, and is connected to the regulating single chip microcomputer. A single-phase sinusoidal half-wave with a phase shift angle α, corresponding to a pulse width of 10 ms-t, such as pulse 3, pulse 4, pulse 5 in fig. 5, or pulse 9, pulse 10 in fig. 6; after sending the brightness control signal once, the voltage waveform output by the single live line output AC1 is a continuous complete single-phase sine wave, the negative half-wave rectification shaping of the brightness control signal or the positive half-wave rectification shaping of the brightness control signal, and the pulse width is restored to a rectangular wave of 10ms, such as the pulse 6 in fig. 5 or the pulse 11 in fig. 6. And in the voltage waveform after the brightness control signal negative half-wave rectification shaping and the voltage waveform after the brightness control signal negative positive wave rectification shaping received by the single chip microcomputer after the waveform is guided, the number of pulses with the width of 180-alpha or the time of 10 ms-t is the number of single-phase sine half-waves with the phase shift angle of alpha in the data waveform. And judging whether the pulse width in the voltage waveform after the negative half-wave rectification and shaping of the brightness control signal and the voltage waveform after the negative positive-wave rectification and shaping of the brightness control signal is 10ms or 10 ms-t, and judging whether the pulse width is closer to 10ms or 10 ms-t.
The brightness of the LED lamp is changed by changing the duty ratio of a PWM brightness adjusting signal connected to an enabling control terminal PWM _ D of the LED driver U6.
In fig. 1, the wall-control switch unit is a single live wire AC in, and a single live wire AC1 out; the LED lamp adjusts the live wire AC1 of the driving unit to enter, and the zero wire N to exit. In view of anti-interference, the positions of the live wire AC and the zero wire N in the figure 1 are exchanged, the method is still effective, and the anti-interference capability is stronger.
The method of the invention has the following characteristics:
firstly, the brightness of the LED lamp is controlled by adopting a single live wire mode, a remote controller is not needed, a control wire is not needed, and a power line is not needed to be laid again; secondly, the brightness adjustment of the LED lamp is divided into 9 grades, and a knob device is adopted for adjustment, so that the operation habit is met;
and thirdly, the brightness control signal on the single live wire is only sent in a short time when the brightness is changed, and when the LED lamp is in a lighting state and does not send the brightness control signal, the voltage waveform output by the output end of the single live wire is a continuous and complete single-phase sine wave without harmonic waves.
Fourthly, the lamp has the function of turning off the lamp.
Claims (10)
1. A wall-control LED lamp low-harmonic dimming method is realized by a device consisting of a wall-control switch unit and an LED lamp adjusting and driving unit, wherein the wall-control switch unit is provided with a single-live-wire input end and a single-live-wire output end, and the single-live-wire input end is connected to an alternating-current power supply live wire; the LED lamp adjusting and driving unit is provided with a live wire input end and a zero line input end, wherein the live wire input end is connected to the single live wire output end of the wall control switch unit, and the zero line input end is connected to a zero line of an alternating current power supply; the method is characterized in that: the wall control switch unit consists of a single-live-wire power supply module, a single-chip microcomputer control module, a phase-shifting driving module, a zero-crossing detection module and a brightness giving module;
the wall control switch unit sends a brightness control signal by controlling the voltage waveform output by the single live wire output end, wherein the brightness control signal comprises a guide waveform and a data waveform; the guide waveform consists of a non-conductive negative half-wave followed by a fully conductive positive half-wave; the guide waveform is composed of a non-conductive complete cycle wave and a completely conductive positive half wave;
the data waveform consists of continuous K single-phase sine half waves with phase shift angles of alpha, the brightness level of the brightness control signal sent by the data waveform is brightness K, and K is an integer greater than or equal to 1 and less than or equal to 9;
the zero-crossing detection module is a half-wave rectification voltage division circuit, can detect a zero-crossing signal of the alternating current power supply and provides the zero-crossing signal to the single-chip microcomputer control module; the zero-crossing detection module can detect a zero-crossing signal of the alternating current power supply, and the zero-crossing detection module is matched with the single-chip microcomputer control module and the phase-shifting driving module together to complete the detection of the zero-crossing signal of the alternating current power supply;
the zero-crossing detection module consists of a diode D2, a resistor R4, a resistor R5 and a voltage stabilizing tube DW 1; two ends of the resistor R4 are respectively connected to the cathode of the diode D2 and the cathode of the voltage regulator tube DW 1; the anode of the diode D2 is connected to the single live wire output end; the anode of the voltage stabilizing tube DW1 is connected to the analog ground of the wall-controlled switch unit; the resistor R5 is connected in parallel at two ends of the voltage stabilizing tube DW 1; a zero-crossing signal is output from the cathode of the voltage stabilizing tube DW 1;
the phase-shifting driving module is a bidirectional thyristor alternating-current phase-shifting circuit; the singlechip control module is provided with a trigger signal output end; the trigger signal input end of the phase-shifting driving module is connected to the trigger signal output end of the singlechip control module; the phase-shift driving module consists of a bidirectional thyristor V1, a thyristor output optocoupler, a resistor R1, a resistor R2 and a resistor R3; two anode ends of the bidirectional thyristor V1 are respectively connected to the single live wire output end and the alternating voltage end of the single live wire voltage stabilizer; the resistor R1 is connected in parallel with the two anode ends of the bidirectional thyristor V1; the output thyristor of the thyristor output optocoupler is connected in series with a resistor R2, and a series branch of the output thyristor is connected to a first anode and a control electrode of the bidirectional thyristor V1; an input light emitting diode of the silicon controlled output optocoupler is connected with a resistor R3 in series, one end of a series branch of the input light emitting diode is connected to a direct current working power supply, and the other end of the series branch is a trigger signal input end; one anode of the bidirectional thyristor V1 is a single-live-wire output end, and the other anode is connected to the single-live-wire input end through a single-live-wire power supply module; the input end of the single live wire is the analog ground of the wall-control switch unit;
when the singlechip control module sends out a brightness control signal, the trigger signal output is stopped randomly; when the moment of stopping outputting the trigger signal is in the positive half-wave period of the alternating-current power supply, the bidirectional thyristor in the phase-shifting driving module is not conducted in the next negative half-wave period of the alternating-current power supply, the zero-crossing detection module outputs a zero-crossing signal in the next negative half-wave period of the alternating-current power supply, and the zero-crossing signal is a positive pulse corresponding to the non-conducted negative half-wave period of the alternating-current power supply; when the moment of stopping the output of the trigger signal is in the negative half-wave period of the alternating current power supply, the bidirectional thyristor in the phase-shifting driving module is not conducted in the next positive half-wave of the alternating current power supply and the next negative half-wave of the alternating current power supply, the zero-crossing detection module does not output a zero-crossing signal in the non-conducted positive half-wave of the alternating current power supply, and outputs a zero-crossing signal in the next negative half-wave of the alternating current power supply, wherein the zero-crossing signal is a positive pulse corresponding to the next negative half.
2. The wall-controlled LED lamp low-harmonic dimming method according to claim 1, characterized in that: the single-live-wire power supply module has a single-live-wire off-state power taking function and an on-state power taking function and is used for providing a working power supply for the wall control switch unit;
the brightness giving module can provide the brightness level of the brightness control signal to the single-chip microcomputer control module;
the single-chip microcomputer control module sends a trigger signal to control the phase-shifting driving module to supply power to the LED lamp adjusting driving unit and sends a brightness control signal to the LED lamp adjusting driving unit according to the brightness grade of the brightness control signal.
3. The wall-controlled LED lamp low-harmonic dimming method according to claim 2, characterized in that: taking the positive pulse falling edge of the zero-crossing signal as a zero-crossing timing starting point, and taking the position of 10ms as a calculation starting point 0 degree point of a phase shift angle alpha of the 1 st single-phase sine half-wave in the data waveform; the 20ms is the triggering time of the phase shift angle alpha of the 2 nd single-phase sine half-wave in the data waveform, namely the 20ms is the calculation starting point 0 degree point of the phase shift angle alpha of the 2 nd single-phase sine half-wave in the data waveform; and so on, the phase shift angle alpha of the Kth single-phase sine half wave in the data waveform is calculated to be at the K multiplied by 10ms from the starting point of 0 degree.
4. The wall-controlled LED lamp low-harmonic dimming method according to any one of claims 1-3, characterized in that: the method for sending out the data waveform is that at the triggering moment of the phase shift angle alpha of each single-phase sine half-wave of the data waveform, the single-chip microcomputer control module sends out a narrow triggering pulse.
5. The wall-controlled LED lamp low-harmonic dimming method according to any one of claims 1-3, characterized in that: when the LED lamp is in a closed state, the single-chip microcomputer control module stops outputting the trigger signal.
6. The wall-controlled LED lamp low-harmonic dimming method according to any one of claims 1-3, wherein the wall-controlled switch unit sends the brightness control signal by the following method:
step A, judging whether the LED lamp is turned off, if so, turning off the LED lamp, and turning to step C; otherwise, turning to the step B;
step B, sending out a primary brightness control signal;
step C, judging whether the brightness level of the brightness control signal is changed or not, changing the brightness level, and returning to the step A; the brightness level is not changed, the state of not sending out the brightness control signal is maintained, and the step C is returned;
the state of not sending out the brightness control signal is maintained, and when the LED lamp is in the off state, micro-current flows through the output end of the single live wire; the LED lamp is maintained in a state of not sending out a brightness control signal, and when the LED lamp is in a lighting state, the voltage waveform output by the output end of the single live wire is a continuous and complete single-phase sine wave.
7. The wall-controlled LED lamp low-harmonic dimming method according to any one of claims 1-3, characterized in that: the LED lamp adjusting driving unit consists of a single chip microcomputer adjusting module and an LED driving module;
the LED driving module is provided with an alternating current input end and an LED lamp driving end, wherein the alternating current input end is connected to the live wire input end and the zero line input end of the LED lamp adjusting driving unit, and the LED lamp driving end is connected to the LED lamp;
the LED driving module is also provided with a PWM brightness adjusting signal input end;
the single chip microcomputer adjusting module comprises an adjusting single chip microcomputer, a positive half-wave rectification and shaping circuit, a negative half-wave rectification and shaping circuit and a rectification and voltage stabilizing circuit, and is provided with an alternating current input end and a PWM brightness adjusting signal output end; the alternating current input end is connected to the live wire input end and the zero line input end of the LED lamp adjusting driving unit, and the PWM brightness adjusting signal output end is connected to the PWM brightness adjusting signal input end of the LED driving module; the positive half-wave rectification and shaping circuit and the negative half-wave rectification and shaping circuit respectively carry out positive half-wave rectification and shaping and negative half-wave rectification and shaping on the alternating voltage input by the live wire input end; and the output of the positive half-wave rectification and shaping circuit and the output of the negative half-wave rectification and shaping circuit are respectively connected to different pulse capture input ends of the regulating singlechip.
8. The wall-controlled LED lamp low-harmonic dimming method according to claim 7, characterized in that:
the LED lamp adjusting and driving unit receives the brightness control signal and controls the brightness by the singlechip adjusting module,
initializing, namely controlling an LED lamp to be initial brightness;
judging whether a single live wire has a brightness control signal or not; if no brightness control signal exists, returning to the step two; if the brightness control signal exists, turning to the third step;
step three, receiving a brightness control signal and determining the brightness level;
step four, changing the brightness of the LED lamp; and returning to the step two.
9. The wall-controlled LED lamp low-harmonic dimming method according to claim 8, characterized in that:
judging whether the single live wire has the brightness control signal or not by judging whether the single live wire has the guide waveform of the brightness control signal or not;
receiving a brightness control signal and determining the brightness grade by judging the number of single-phase sine half-waves with phase shift angle alpha in the data waveform; the method comprises the following steps that continuous K single-phase sine half-waves with phase shift angle alpha are provided, and the brightness level of a brightness control signal is brightness K;
the LED lamp brightness is changed by changing the duty ratio of a PWM brightness adjusting signal connected to the LED lamp adjusting driving unit through the single chip microcomputer adjusting module.
10. The wall-controlled LED lamp low-harmonic dimming method according to claim 9, characterized in that: the method for judging whether the single live wire has the guide waveform of the brightness control signal comprises the steps of judging whether the waveform output by the negative half-wave rectification and shaping circuit has negative half-wave pulse loss and judging whether the waveform output by the subsequent positive half-wave rectification and shaping circuit has a complete positive half-wave waveform.
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| CN106027005B (en) * | 2016-06-15 | 2019-01-04 | 湖南工业大学 | Single firewire switch |
| CN106100629B (en) * | 2016-06-15 | 2019-01-04 | 湖南工业大学 | Single firewire soft-touch control |
| CN106033958B (en) * | 2016-06-15 | 2019-03-01 | 湖南工业大学 | The single firewire switch mostly jointly controlled |
| CN106033967B (en) * | 2016-06-15 | 2019-03-01 | 湖南工业大学 | Capacitor type touch switch |
| CN106033957B (en) * | 2016-06-15 | 2019-01-04 | 湖南工业大学 | The single firewire switch mostly controlled |
| CN106033959B (en) * | 2016-06-15 | 2019-01-04 | 湖南工业大学 | Single firewire switch of more ground self-resetting switch control |
| US10375796B2 (en) | 2017-04-25 | 2019-08-06 | Current Lighting Solutions, Llc | Waveform shaping circuit for spurious harmonic suppression |
| CN108366467A (en) * | 2018-05-08 | 2018-08-03 | 浙江摩根智能技术有限公司 | Single firewire signal light adjusting circuit |
| CN109246886B (en) * | 2018-09-11 | 2021-04-09 | 浙江凯耀照明股份有限公司 | Intelligent TRIAC light modulator |
| CN110133359B (en) * | 2019-05-23 | 2021-08-13 | 广东美的制冷设备有限公司 | Air conditioner zero-crossing detection circuit, electric control device and air conditioner |
| CN111194132B (en) * | 2020-02-12 | 2022-02-15 | 西安奇妙电子科技有限公司 | Single live wire power-taking circuit and single live wire switch |
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| CN114299737B (en) * | 2021-12-03 | 2022-12-02 | 江苏航天大为科技股份有限公司 | Synchronous timing signal generating device for internet connection signal lamp |
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Inventor after: He Jun Inventor after: Ling Yun Inventor after: Wang Bing Inventor after: Guo Yanjie Inventor before: Ling Yun Inventor before: Wang Bing Inventor before: Guo Yanjie |
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