CN103957648A - Universal circuit for thyristor dimming, analogue dimming and PWM dimming and LED driving chip - Google Patents
Universal circuit for thyristor dimming, analogue dimming and PWM dimming and LED driving chip Download PDFInfo
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Abstract
The invention discloses a universal circuit for thyristor dimming, analogue dimming and PWM dimming. The universal circuit for thyristor dimming, analogue dimming and PWM dimming is used for LED dimming. The universal circuit for thyristor dimming, analogue dimming and PWM dimming comprises an LED current setting module, wherein the LED current setting module comprises an analogue voltage input end used for setting the current of an LED and an on-off control end used for controlling switching on and switching off of the LED. The universal circuit for thyristor dimming, analogue dimming and PWM dimming further comprises a first hysteresis module, a thyristor current module and a second hysteresis module. The invention further discloses an LED driving chip. The LED driving chip comprises the universal circuit for thyristor dimming, analogue dimming and PWM dimming. According to the universal circuit for thyristor dimming, analogue dimming and PWM dimming and the LED driving circuit, direct analogue dimming can be automatically selected to be conducted, or indirect analogue dimming can be selected to be conducted by converting thyristor signals or PWM signals into analogue voltage signals, or PWM dimming can be selected to be conduced by loading the thyristor signals or PWM signals onto a dimming switch circuit after the thyristor signals or PWM signals are shaped, and thus integration of multiple dimming modes is achieved.
Description
Technical field
The invention belongs to electronic circuit field, relate to a kind of integrated circuit, particularly a kind of controllable silicon, simulation, PWM light modulation universal circuit and a kind of LED drive chip.
Background technology
LED has the advantages such as luminous efficiency higher and useful life is long, thereby is widely used.And the light modulation of LED can make its energy-conservation characteristic further be brought into play, and increase its useful life.
The main dimming mode of LED generally has three kinds at present, is respectively simulation light modulation, controllable silicon light modulation and PWM light modulation.
Traditional simulation light modulation, normally employing regulates the mode of the resistance of LED series resistance to change the size of LED electric current, utilizes voltage divider principle to realize light modulation.And the invention driving along with novel non-pure resistance LED changes merely resistance cannot realize light modulation, simulation light modulation mechanism changes thereupon.Yet even if light modulation mechanism changes, the control mode of simulation light modulation can not change, be all to change LED output equivalent electric current according to the size of input analog signal, thereby realize dimming function.And the shortcoming of simulation light modulation is that the luminescent spectrum of LED can be offset along with the variation of electric current.
Thyristor regulating is a kind of comparatively common dimming mode only, and its operation principle is that the sinusoidal wave AC power of input is carried out to copped wave, is about to sinusoidal wave " clipping " a part of waveform, by regulating the silicon controlled angle of flow to change the effective value of output voltage.But, the shortcoming of controllable silicon light modulation is also obvious: the one, through the AC power of copped wave, can produce high order harmonic component, be loaded in load and can produce and disturb, the mains voltage waveform distortion that it causes also can increase the load of power supply-distribution system, affects other power consumption equipments in electrical network; The 2nd, AC power, after copped wave, is loaded in load and changes output voltage effective value, be only applicable to traditional pure resistive LED drive circuit, cannot drive and carry out light modulation LED such as novel non-resistances.The 3rd, after controlled silicon conducting, need to maintain electric current and keep conducting.
PWM light modulation, i.e. impulse width modulation and light adjusting, is a kind of novel, dimming mode with vast prospect.The operation principle of PWM light modulation is that the pulse signal of utilization input, opens shutoff LED driver repeatedly, recently regulates the equivalent electric flow valuve of LED, thereby realize dimming function by changing the duty of pulse signal.While carrying out PWM light modulation, the frequency size of pwm signal need to be rationally set: the one, pwm signal frequency can not be too low, if lower than 100Hz, can cause macroscopic scintillation.The 2nd, need to consider the response time that LED drives, LED drives and starts the required time, and pwm signal frequency is too high, or duty ratio is too low, all can cause device to respond.
In three kinds of dimming modes, simulation light modulation structure is the simplest, and dimming scope is the widest; Controllable silicon light modulation is most widely used, and in current many light fixtures, has utilization; The good dimming effect of PWM light modulation, efficiency is high.In practice, each dimming mode respectively has quality, in current LED drive scheme, cannot provide classic dimming mode.
Summary of the invention
For the inherent shortcoming of avoiding existing various dimming mode to exist, select as required suitable dimming mode, the invention discloses a kind of controllable silicon, simulation, PWM light modulation universal circuit and utilize the LED of this circuit to drive chip.
Controllable silicon of the present invention, simulation, PWM light modulation universal circuit, be applied to LED light modulation, comprise LED current settings module, described LED current settings module comprises for setting analog voltage input and a control LED conducting whether switch control end of LED electric current;
Also comprise the first hysteresis module, controllable silicon current module, the second hysteresis module;
The input signal that described first and second hysteresis module changed the cycle carries out shaping, export identical with frequency input signal, the square-wave signal that pulsewidth is controlled, the high level width of square-wave signal is determined by the reference voltage that is input to this hysteresis module;
Described controllable silicon current module is connected with the output of the first hysteresis module, according to the low and high level state of the first hysteresis module output signal, closes or export controlled silicon conducting electric current;
The output of the input of described the second hysteresis module and the first hysteresis module is all connected to described analog voltage input, and the output of described the second hysteresis module is connected to described switch control end.
Concrete, hysteresis module is comprised of comparator, inverter, the first switching tube, second switch pipe, the first reference voltage input and the second reference voltage input;
Described comparator normal phase input end is as the signal input part of hysteresis module, the first switching tube and second switch pipe are connected between the first reference voltage input, the second reference voltage input and comparator inverting input, comparator output terminal connects inverter, and the input of inverter and output are connected respectively the grid of second switch pipe and the first switching tube; The output of described comparator is as the output of hysteresis module, and the reference voltage value of described the first reference voltage input is higher than the second reference voltage.
Further, described controllable silicon current module comprises divider resistance string and the 3rd switching tube being connected between power supply and ground, the intermediate node of described divider resistance string is connected with the base current input of triode amplifying stage, active component in described divider resistance string from intermediate node to ground is parallel with the 4th switching tube, and the grid of described the 3rd switching tube and the 4th switching tube is connected respectively output and the input of inverter in the first hysteresis module.
Further, described triode amplifying stage comprises a triode or a plurality of cascade triode, the base stage of a triode after the emitter that cascade system is last triode connects, and collector electrode links together as the electric current amplification output of triode amplifying stage.
Further, between described the first switching tube and second switch pipe and the inverting input of comparator, be connected with respectively the first filter resistance, between the inverting input of described comparator and ground, be connected with the first filter capacitor.
Preferably, the input of described the second hysteresis module is to being connected with the second filter capacitor between ground, between the input of described the second hysteresis module and analog voltage input, be connected with the second filter resistance, between described analog voltage input and the first hysteresis module output, be connected with current-limiting resistance.
The invention also discloses a kind of LED and drive chip, comprise controllable silicon, simulation, PWM light modulation universal circuit as described in front any one, wherein the electric current of the signal input part of the first hysteresis circuit, analog voltage input, triode amplifying stage amplifies output as chip pin.
Preferably, the electric current amplification output that the intermediate node of described divider resistance string substitutes triode amplifying stage is as chip pin.
Adopt controllable silicon of the present invention, simulation, PWM light modulation universal circuit, can independently select to carry out direct modeling light modulation, or select that controllable silicon or pwm signal are converted to analog voltage signal and carry out indirect analog light modulation, can also select after controllable silicon or pwm signal shaping, to be loaded on dimmer switch circuit and to carry out PWM light modulation, realize multiple dimming mode and integrate.
The present invention utilizes a set of change-over circuit that is integrated in chip internal, and a small amount of external devices is added in selection, can freely between simulation light modulation, controllable silicon light modulation or PWM dimming mode, switch and use, select most suitable dimming mode to drive and carry out brightness adjustment control LED.
Accompanying drawing explanation
Fig. 1 illustrates a kind of embodiment of the present invention vertical section schematic diagram;
Fig. 2 illustrates a kind of embodiment structural representation of hysteresis module of the present invention;
Fig. 3 illustrates a kind of embodiment structural representation of controllable silicon current module of the present invention;
Fig. 4 is the signal waveform schematic diagram of hysteresis module of the present invention;
In figure, Reference numeral name is called: the electric current of the signal input part 2-analog voltage input 3-switch control end 4-triode amplifying stage of the cloudy comparator INV-of REF1-first reference voltage REF2-second reference voltage M1-the first switching tube M2-second switch pipe M3-the 3rd switching tube M4-the 4th switching tube COMP-inverter VCC-power supply Q1-first triode Q2-second triode R1-first filter resistance R2-first divider resistance R3-second divider resistance R4-base stage current-limiting resistance R5-second filter resistance R6-current-limiting resistance C1-first filter capacitor C2-second filter capacitor C3-integrating capacitor 1-the first hysteresis circuit amplifies output.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Controllable silicon of the present invention, simulation, PWM light modulation universal circuit, be applied to LED light modulation, comprise LED current settings module, described LED current settings module comprises for setting analog voltage input and a control LED conducting whether switch control end of LED electric current.
LED current settings is ripe prior art in LED Driving technique, but various forms of light adjusting circuits, the dimming mode of analog voltage of all take is basis, at analog voltage input, by external or built-in reference voltage, input, basic principle is to utilize input voltage value to set the electric current that flows through LED, simultaneously for convenience of control, particularly brightness adjustment control, for the conducting of controlling LED whether LED current settings module is provided with switch control end conventionally.
Controllable silicon of the present invention, simulation, PWM light modulation universal circuit, also comprise the first hysteresis module, controllable silicon current module, the second hysteresis module; The input signal that described first and second hysteresis module changed the cycle carries out shaping, export identical with frequency input signal, the square-wave signal that pulsewidth is controlled, the high level width of square-wave signal is determined by the reference voltage that is input to this hysteresis module.
Hysteresis module essence is a Shaping Module, be about to the various extraneous periodic signal of input, for example sinusoidal wave, triangular wave or voltage magnitude are greater than the signal shaping of multiple power source voltage of the present invention, output frequency is identical, the square-wave signal that pulsewidth is controlled, pulse duration is wherein determined by the reference voltage that is input to hysteresis module.
Provide as shown in Figure 2 an embodiment of hysteresis module of the present invention, by comparator C OMP, inverter INV, the first switching tube M1, second switch pipe M2, the first reference voltage input REF1 and the second reference voltage input REF2, formed; Described comparator normal phase input end is as the signal input part of hysteresis module, the first switching tube and second switch pipe are connected between the first reference voltage input, the second reference voltage input and comparator inverting input, comparator output terminal connects inverter, and the input of inverter and output are connected respectively the grid of second switch pipe and the first switching tube; The output of described comparator is as the output of hysteresis module, and the reference voltage value of described the first reference voltage input is higher than the second reference voltage.
As Fig. 2, suppose when initial, input signal IN is zero, comparator output TRout is low, the first switching tube conducting, the first reference voltage REF1 receives the negative input end of comparator.When the voltage of input signal IN surpasses the first reference voltage REF1, comparator output TRout saltus step is high level, and after comparator output TRout saltus step is height, the first switching tube M1 closes, second switch pipe M2 conducting, the negative input end voltage of comparator switches to the second lower reference voltage REF2.And when input signal IN is lower than shutoff voltage REF2, comparator output Trout replys as low level, i.e. zero potential.
Difference between the first reference voltage REF1 and the second reference voltage REF2 is the hysteresis to input signal, the output signal TRout that the effect of constructing this hysteresis is to make this signaling conversion circuit can be because of input signal IN near minor fluctuations reference voltage and make to export quick oscillation.As shown in Figure 4, suppose that input signal is triangular wave, the T2 time period in output signal TROUT high level is the hysteresis that this hysteresis circuit produces, and actually provides a minimum pulse width width that pulsewidth is determined by two reference voltage differences.
Hysteresis module is converted to the controllable silicon signal of input or pwm signal the signal of output TRout end simultaneously, the low and high level that the low and high level of Trout output is comparator, conventionally consistent with subsequent conditioning circuit level current potential, obtain one meet subsequent conditioning circuit requirement of the present invention, high level is the square-wave signal that internal power source voltage VC1, low level are zero potential, facilitates subsequent conditioning circuit running.
Reference voltage is provided by the reference voltage module of chip internal conventionally, such as band-gap reference etc., a plurality of circuit modules that are often input in chip due to reference voltage are used, the operating state of all the other modules may cause the fluctuation of reference voltage value, therefore filter circuit is preferably set, as shown in Figure 2, between the first switching tube and second switch pipe and the inverting input of comparator, be connected with respectively the first filter resistance, between the inverting input of described comparator and ground, be connected with the first filter capacitor, form RC low pass filter, filtering high frequency clutter.
The effect of controllable silicon current module is when using controllable silicon light modulation mode, for controllable silicon provides On current.But this On current is not constantly all to exist.When the first hysteresis module is output as when high, controllable silicon output current has been higher current value, and now controllable silicon current module does not need to export On current.When the first hysteresis module is output as when low, controllable silicon output current is not in the situation that there is no controllable silicon current module, and its output current can be lower, and controllable silicon output current controllable silicon cannot normally when lower, there will be error situation.At this moment need a controlled silicon conducting electric current of the extra generation of controllable silicon current module, maintain the normal work of controllable silicon when low-pressure area.
Controllable silicon current module is connected with the output of the first hysteresis module, according to the low and high level state of the first hysteresis module output signal, closes or export controlled silicon conducting electric current.
As Fig. 3 provides a kind of embodiment of controllable silicon current module, controllable silicon current module comprises divider resistance string and the 3rd switching tube being connected between power supply and ground, the intermediate node of described divider resistance string is connected with the base current input of triode amplifying stage, active component in described divider resistance string from intermediate node to ground is parallel with the 4th switching tube, and the grid of described the 3rd switching tube and the 4th switching tube is connected respectively output and the input of inverter in the first hysteresis module.
The input of the third and fourth switching tube is connected with the output signal of the first hysteresis module, in the embodiment shown in Fig. 3, the third and fourth switching tube is NMOS pipe, due to the signals reverse connecting, when the 3rd switching tube is opened, the 4th switching tube is closed, now from power supply VCC to ground, form a current path, divider resistance string is comprised of the first divider resistance R2 and the second divider resistance R3, the common node output current of two divider resistances, for reducing the power consumption on divider resistance, conventionally R2 and R3 resistance are larger, also can be as shown in Figure 2, the base current resistance R 4 of connecting on this branch road, make the electric current that flows through R2 or R3 only produce faint power consumption, now should connect triode amplifying circuit at common node, can adopt the form of a triode, but generally adopt two triodes, the large multiple in electric current side of triode arrives up to a hundred conventionally tens, when the base current of output is during in microampere magnitude, can at the electric current of triode, amplify output and obtain tens of electric currents that arrive up to a hundred milliamperes.Also can adopt the mode of more triode cascades, the base stage of a triode after the emitter of last triode connects, collector electrode links together as the electric current amplification output of triode amplifying stage.
The output of the input of the second hysteresis module and the first hysteresis module is all connected to described analog voltage input, and the output of described the second hysteresis module is connected to described switch control end.Optimal way also can be as shown in Figure 1, at the input of the second hysteresis module to connecting the second filter capacitor C2 between ground, between the input of described the second hysteresis module and analog voltage input, be connected with the second filter resistance R5, between described analog voltage input and the first hysteresis module output, be connected with current-limiting resistance R6, at analog voltage input during as the external pin of chip, can play isolating exterior impacting with high pressure, filter the effect of pin clutter.
To adopting the LED of foregoing circuit structure to drive chip, the electric current of the signal input part of the first hysteresis circuit, analog voltage input, triode amplifying stage amplifies output as chip pin, below sets forth and how to realize various LED dimming modes.
Traditional simulation dimming mode is the simplest, directly analog voltage is inputted from analog voltage input pin.As shown in Figure 1, common setting means is that when input voltage is internal power source voltage VC1, LED output current is maximum, i.e. 100% light modulation output; Along with being input to the decline of analog voltage input magnitude of voltage, light modulation output current reduces gradually.
For direct PWM light modulation or controllable silicon light modulation, dim signal is all inputted from the signal input part of the first hysteresis circuit, through the shaping of the first hysteresis circuit and the second hysteresis circuit, the output of the second hysteresis circuit is directly controlled the switch control end of LED light-adjusting module, controls LED lamp interval switch.Wherein thyristor regulating optical module is carrying out the thyristor regulating light time, can be at the intermediate node place of divider resistance string external triode amplifying stage, amplified current, as the On current of thyristor regulating light time, is realized controllable silicon light modulation.
If employing controllable silicon light modulation, realizes simulation light modulation or PWM light modulation to LED lamp, realize in the following way:
If connect an integrating capacitor C3 to ground at analog voltage input 2 ends, dimming mode is simulation light modulation.From switching capacity relevant knowledge, 2 terminal voltage sizes equal the duty ratio D of square-wave signal TRout end of the first hysteresis module output and the supply voltage product of comparator, integrating capacitor C3 is converted into this square-wave signal of output the analog voltage signal of 2 ends, by LED light adjusting circuit, realizes dimming function.If analog voltage input 2 ends do not connect integrating capacitor, dimming mode is PWM light modulation.The square-wave pulse signal of the first hysteresis circuit output is directly transferred to the second hysteresis circuit, and homophase is synchronizeed in the output of the second hysteresis circuit with the output signal of the first hysteresis circuit, control the unlatching shutoff that LED drives, thereby realize PWM light modulation.For controllable silicon can normally be worked, the present invention is when controllable silicon output enters low-pressure area, and controllable silicon current module output current amplifies through external dimmer triode, for controllable silicon provides On current.
The common capacitance of integrating capacitor C3 is larger, reaches microfarad range, is unsuitable for being integrated in chip internal, conventionally utilizes external capacitor to realize.
If adopt PWM dimming mode, light modulation principle is identical with previously described controllable silicon light modulation mode, all pwm signal to be carried in to the signal input part of the first hysteresis module, according to whether whether connecting integrating capacitor C3 at analog voltage input, deciding dimming mode is simulation light modulation or PWM light modulation.Because PWM light modulation does not need On current, now need not carry out electric current amplification by external triode.
Controllable silicon of the present invention, simulation, PWM light modulation universal circuit, in the time of in being specifically applied to LED driving chip, by the signal input part of the first hysteresis circuit, analog voltage input, the electric current of triode amplifying stage amplifies output, and as chip pin, encapsulation exposes, all the other devices are all integrated in chip internal, triode amplifying stage triode device used can be integrated in chip internal, also can overlap triode amplifying stage in chip exterior, the electric current amplification output that now intermediate node of divider resistance string substitutes triode amplifying stage is as chip pin, this pin is connected with the base stage of first triode, the electric current of drawing from this pin is as the base current of first triode, realization provides the object of controlled silicon conducting electric current I hold.
The present invention utilizes a set of change-over circuit that is integrated in chip internal, and a small amount of external devices is added in selection, can freely between simulation light modulation, controllable silicon light modulation or PWM dimming mode, switch and use, select most suitable dimming mode to drive and carry out brightness adjustment control LED.
Previously described is each preferred embodiment of the present invention, preferred implementation in each preferred embodiment is if not obviously contradictory or take a certain preferred implementation as prerequisite, each preferred implementation arbitrarily stack combinations is used, design parameter in described embodiment and embodiment is only the invention proof procedure for clear statement inventor, not in order to limit scope of patent protection of the present invention, scope of patent protection of the present invention is still as the criterion with its claims, the equivalent structure that every utilization specification of the present invention and accompanying drawing content are done changes, in like manner all should be included in protection scope of the present invention.
Claims (8)
1. controllable silicon, simulation, PWM light modulation universal circuit, be applied to LED light modulation, comprises LED current settings module, and described LED current settings module comprises for setting analog voltage input and a control LED conducting whether switch control end of LED electric current;
It is characterized in that, also comprise the first hysteresis module, controllable silicon current module, the second hysteresis module;
The input signal that described first and second hysteresis module changed the cycle carries out shaping, export identical with frequency input signal, the square-wave signal that pulsewidth is controlled, the high level width of square-wave signal is determined by the reference voltage that is input to this hysteresis module;
Described controllable silicon current module is connected with the output of the first hysteresis module, according to the low and high level state of the first hysteresis module output signal, closes or export controlled silicon conducting electric current;
The output of the input of described the second hysteresis module and the first hysteresis module is all connected to described analog voltage input, and the output of described the second hysteresis module is connected to described switch control end.
2. controllable silicon as claimed in claim 1, simulation, PWM light modulation universal circuit, is characterized in that, hysteresis module is comprised of comparator, inverter, the first switching tube, second switch pipe, the first reference voltage input and the second reference voltage input;
Described comparator normal phase input end is as the signal input part of hysteresis module, the first switching tube and second switch pipe are connected between the first reference voltage input, the second reference voltage input and comparator inverting input, comparator output terminal connects inverter, and the input of inverter and output are connected respectively the grid of second switch pipe and the first switching tube; The output of described comparator is as the output of hysteresis module, and the reference voltage value of described the first reference voltage input is higher than the second reference voltage.
3. controllable silicon as claimed in claim 2, simulation, PWM light modulation universal circuit, it is characterized in that, described controllable silicon current module comprises divider resistance string and the 3rd switching tube being connected between power supply and ground, the intermediate node of described divider resistance string is connected with the base current input of triode amplifying stage, active component in described divider resistance string from intermediate node to ground is parallel with the 4th switching tube, and the grid of described the 3rd switching tube and the 4th switching tube is connected respectively output and the input of inverter in the first hysteresis module.
4. a kind of controllable silicon as claimed in claim 3, simulation, PWM light modulation universal circuit, it is characterized in that, described triode amplifying stage comprises a triode or a plurality of cascade triode, cascade system is the base stage of a triode after the emitter of last triode connects, and collector electrode links together as the electric current amplification output of triode amplifying stage.
5. a kind of controllable silicon as claimed in claim 2, simulation, PWM light modulation universal circuit, it is characterized in that, between described the first switching tube and second switch pipe and the inverting input of comparator, be connected with respectively the first filter resistance, between the inverting input of described comparator and ground, be connected with the first filter capacitor.
6. controllable silicon as claimed in claim 1, simulation, PWM light modulation universal circuit, it is characterized in that, the input of described the second hysteresis module is to being connected with the second filter capacitor between ground, between the input of described the second hysteresis module and analog voltage input, be connected with the second filter resistance, between described analog voltage input and the first hysteresis module input, be connected with current-limiting resistance.
7.LED drives chip, it is characterized in that, comprise controllable silicon, simulation, PWM light modulation universal circuit as described in claim 1 to 6 any one, wherein the electric current of the signal input part of the first hysteresis circuit, analog voltage input, triode amplifying stage amplifies output as chip pin.
8. LED as claimed in claim 7 drives chip, it is characterized in that, comprise controllable silicon, simulation, PWM light modulation universal circuit as described in claim 3 to 4 any one, the electric current that the intermediate node of described divider resistance string substitutes triode amplifying stage amplifies output as chip pin.
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| CN110445547A (en) * | 2019-09-17 | 2019-11-12 | 成都芯瑞科技股份有限公司 | A kind of circuit using optical fiber transmission width adjustable pulse signal |
| CN113301693A (en) * | 2021-05-25 | 2021-08-24 | 昂宝电子（上海）有限公司 | Multi-mode dimming circuit and method |
| CN113966027A (en) * | 2021-11-11 | 2022-01-21 | 欧普照明股份有限公司 | Circuit, method and device for adjusting duty ratio of signal and LED lamp |
| CN117479381A (en) * | 2023-12-25 | 2024-01-30 | 深圳利普芯微电子有限公司 | Dimming control circuit, driving chip and LED driving system |
| CN117479381B (en) * | 2023-12-25 | 2024-03-26 | 深圳利普芯微电子有限公司 | Dimming control circuit, driving chip and LED driving system |
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Address after: 611731 innovation center, No. 4, West core road, hi tech West District, Sichuan, Chengdu C341-343 Patentee after: Chengdu Qi Chen electronic Limited by Share Ltd Address before: 611731 innovation center, No. 4, West core road, hi tech West District, Sichuan, Chengdu C341-343 Patentee before: Chengdu Chip-Rail Microelectronic Co., Ltd. |