CN102869155A - LED (light-emitting diode) driving source control circuit and control method thereof - Google Patents
LED (light-emitting diode) driving source control circuit and control method thereof Download PDFInfo
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- CN102869155A CN102869155A CN2012103255198A CN201210325519A CN102869155A CN 102869155 A CN102869155 A CN 102869155A CN 2012103255198 A CN2012103255198 A CN 2012103255198A CN 201210325519 A CN201210325519 A CN 201210325519A CN 102869155 A CN102869155 A CN 102869155A
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Abstract
The invention discloses an LED (light-emitting diode) driving source control circuit and a control method thereof. A power supply module provides a direct-current voltage for the LED driving source control circuit, the LED driving source control circuit drives and controls a loading module, the LED driving source control circuit comprises a temperature control circuit, a reference voltage, a power switch and a sampling resistor, the loading module is connected with the drain electrode of the power switch, the source electrode of the power switch is connected with one end of the sampling resistor, the other end of the sampling resistor is connected with a circuit ground, the temperature control circuit detects the temperature of an LED driving source, and when the temperature of the LED driving source rises to a temperature threshold, controls the output current of an LED control circuit and controls the power of the loading module. According to the invention, the output current is changed dynamically, and the closed-loop control of temperature is realized.
Description
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Technical field
The present invention relates to a kind of switching power source control circuit and control method thereof, relate in particular to a kind of light-emitting diode (LED) driving power control circuit and control method thereof with temperature adjusting function.
Background technology
Traditional LED driving power circuit often is provided with overheating protection circuit; its work-based logic is; when circuit control chip temperature is increased to certain threshold values; turn-off led drive circuit; when circuit control chip temperature is reduced to certain threshold values, reopen led drive circuit, the LED lantern festival is intermittent like this lights or extinguishes; perhaps glimmer the puzzlement when causing the user to use.
Fig. 1 is LED driving power circuit schematic diagram in the prior art, generally includes: rectifier bridge 1, input filter capacitor 2; transformer 3; rectifier diode 4, output capacitance 5, LED load 6; power switch 7; sampling resistor 8, current comparator 9, overheating protection circuit 10; control logic circuit 11, clock 12 and driving buffer circuit 13.When power switch 7 conducting, transformer primary side 14 Current rises, flow through sampling resistor 8 of electric current produces a voltage signal, when this voltage signal reaches the reference voltage of current comparator 9 reverse input ends, control logic circuit 11 output signals are turn-offed power switch 7, and secondary 15 is transferred in the transformer energy storage, and electric current outputs on the output capacitance 5 by secondary 15 rectifier diodes 4, and so that electric current, lightening LED lamp are passed through in LED load 6.
Fig. 2 is the waveform schematic diagram of LED driving power source system temperature C and output current Iout in the prior art; when overheating protection circuit 10 detects when driving that chip temperature is too high to reach a certain threshold values (overheat protector threshold value C2); output signal makes control logic circuit 11 close the driving of power switch 7; thereby the LED lamp is extinguished, avoid the effect that damages thereby play the protective circuit element.When overheating protection circuit 10 detects when driving chip temperature and dropping to a certain threshold values (restarting temperature threshold C1), output signal reopens control logic circuit 11, the normal operation of LED lamp.When ambient temperature is too high, LED lantern festival lighting and extinguish repeatedly.
Summary of the invention
The technical problem to be solved in the present invention is that the LED lamp is repeatedly lighted when ambient temperature is too high and extinguished.
In order to solve the problems of the technologies described above, the invention provides provides a kind of LED driving power control circuit, supply module provides direct voltage for described LED driving power control circuit, described LED driving power control circuit drives and the control load module, described LED driving power control circuit comprises temperature control circuit, reference voltage, power switch and sampling resistor, described load blocks links to each other with the drain electrode of described power switch, the source electrode of described power switch links to each other with an end of described sampling resistor, the other end connection circuit ground of described sampling resistor, described temperature control circuit detects described LED driving power temperature, when the temperature of described LED driving power is elevated to temperature threshold, control the power output of described LED driving power.
Further, also comprise current comparator, clock, driving switch control module, control logic circuit and driving buffer circuit, described clock provides clock signal for described control logic circuit, described driving switch control module receives the output signal of described current comparator and described control logic circuit, and the output control signal is given described driving buffer circuit, described driving buffer circuit output signal connects the gate pole of described power switch, described temperature control circuit indirectly control driving switch control module.
Preferably, the input of described temperature control circuit links to each other with described reference voltage, and the output of described temperature control circuit links to each other with an input of described current comparator, and described sampling resistor links to each other with another input of described current comparator.
Preferably, the input of described temperature control circuit links to each other with described sampling resistor, and the output of described temperature control circuit links to each other with an input of described current comparator, and described reference voltage links to each other with another input of described current comparator.
Preferably, described temperature control circuit links to each other with described clock circuit.
Further, described temperature control circuit comes the temperature of detection system according to the negative temperature coefficient of transistor base and emitter pressure reduction.
Further, described supply module comprises rectifier bridge, input filter capacitor, supplying resistance and partially installing capacitor, described rectifier bridge input termination ac input end, and described rectification bridge output end connects described input filter capacitor.
Further, described load blocks comprises potential device, rectifier diode, output capacitance and LED load, the described input filter capacitor of described potential device one termination, the drain electrode of the described power switch of another termination, the described rectifier diode of another termination of described potential device and described output capacitance.
Preferably, described potential device is transformer or inductance.
Preferably, described driving switch control module is rest-set flip-flop
The present invention also provides a kind of control method of LED control circuit, according to the described LED driving power temperature that described temperature control circuit detects, controls the output current of described LED control circuit, the power of control load module.
Preferably, control the reference voltage of described current comparator by described temperature control circuit, to control the output current of described LED control circuit, the power of control load module.
Preferably, control current sampling signal on the described sampling resistor by described temperature control circuit, to control the output current of described LED control circuit, the power of control load module.
Preferably, control described clock frequency by described temperature control circuit, to control the output current of described LED control circuit, the power of control load module.
The invention has the advantages that the system temperature that utilizes sampling to obtain dynamically changes output current, thereby makes system temperature controlled by analyzing power output to the impact of system temperature, light and the situation of extinguishing to eliminate replacing property of LED lamp.Further, temperature-control circuit among the present invention is by changing the reference voltage of current comparator, perhaps by changing the amplitude of current sample voltage, perhaps by changing system clock output current is changed dynamically, reach the effect of temperature closed loop control.
Description of drawings
Can be by following detailed Description Of The Invention and appended graphic being further understood about the advantages and spirit of the present invention.
Fig. 1 is LED driving power circuit schematic diagram in the prior art;
Fig. 2 is the waveform schematic diagram of LED driving power source system temperature and output current among Fig. 1;
Fig. 3 is the circuit diagram of LED driving power control circuit the first embodiment of the present invention;
Fig. 4 be in the first embodiment temperature control circuit reference voltage and driving power chip temperature concern schematic diagram;
Fig. 5 is the circuit diagram of LED driving power control circuit the second embodiment of the present invention;
Fig. 6 be in the second embodiment temperature control circuit current sampling signal and driving power chip temperature concern schematic diagram;
Fig. 7 is the circuit diagram of LED driving power control circuit the 3rd embodiment of the present invention;
Fig. 8 be in the 3rd embodiment temperature control circuit clock frequency and driving power chip temperature concern schematic diagram;
Fig. 9 is the circuit diagram that inductance replaces transformer among Fig. 3;
Figure 10 is temperature control circuit execution mode schematic diagram of the present invention;
Figure 11 is the waveform relationship figure of driving power chip temperature and output current in the various embodiments of the present invention.
Embodiment
Describe specific embodiments of the invention in detail below in conjunction with accompanying drawing.
The first embodiment
As shown in Figure 3, the LED driving power control circuit that has the temperature adjusting function in the present embodiment comprises power switch 309, sampling resistor 310, temperature control circuit 311, current comparator 312, clock 313, control logic circuit 314, rest-set flip-flop 315 and driving buffer circuit 316, reference voltage module 317 provides reference voltage for temperature control circuit 311.Input AC is sinusoidal wave through rectifier bridge 301 rectifications, produces an input direct voltage at input filter capacitor 302.Input direct voltage is by supplying resistance 303 and partially installing capacitor 304, produce a low-voltage dc voltage at the VCC of driving power chip pin, be control logic circuit 314 and 316 power supplies of power switch 309 switch drive buffer circuits of chip, described partially installing capacitor 304 ground connection.Rectifier bridge 301, input filter capacitor 302, supplying resistance 303 and partially installing capacitor 304 consist of the supply module of driving power chip.The driving power chip is by periodically opening and close power switch 309, produce the voltage drive of an alternation on transformer 305 former limits, when power switch 309 is opened, the transformer primary polygonal voltage is input direct voltage, the magnetizing inductance storage power of transformer, when power switch 309 was closed, the magnetizing inductance energy storage of transformer was discharged in the output capacitance 307 by the rectifier diode 306 of transformer secondary, thereby generate a direct current voltage in output capacitance 307, light LED load 308.Wherein, transformer 305, rectifier diode 306, output capacitance 307 and LED load 308 consist of the load blocks of driving power chip.
In the present embodiment, the driving power chip internal comprises a clock 313, and when each clock cycle began, control logic circuit 314 output SET signals made rest-set flip-flop 315 be output as height, make power switch 309 open-minded by driving buffer circuit 316.From draining 319 to source electrode 318 current flowings, this electric current flows to circuit ground by sampling resistor 310 in the power switch 309, and 310 produce a voltage signal on sampling resistor.This current sampling signal is connected to the in-phase input end of current comparator 312, the reverse input end of current comparator 312 connects the reference voltage signal of processing through temperature control circuit 311, when reference voltage signal that the voltage signal on the sampling resistor 310 equals to process through temperature control circuit 311, current comparator 312 is output as height, rest-set flip-flop 315 outputs are become low, by driving buffer circuit 316 power switch 309 is closed.When the next clock cycle arrived, power switch 309 was again open-minded, and so each switch periods is gone round and begun again, so that the output current of led drive circuit is controlled.
Concrete, as shown in Figure 4, temperature control circuit 311 detects driving power chip temperature Cv, when driving power chip temperature during less than certain pre-set threshold value, do not change reference voltage value V0, when the driving power chip temperature is higher than this pre-set threshold value, reduce reference voltage value, so that the output current of LED driving power circuit and system power reduction, thereby the brightness of lowering the LED lamp is lighted but keep the LED lamp.
The second embodiment
As shown in Figure 5, the LED driving power control circuit that the present embodiment has the temperature adjusting function comprises power switch 309, sampling resistor 310, reference voltage module 317, temperature control circuit 311, current comparator 312, clock 313, control logic circuit 314, rest-set flip-flop 315 and driving buffer circuit 316.Such as the first embodiment, rectifier bridge 301, input filter capacitor 302, supplying resistance 303 and partially installing capacitor 304 consist of the supply module of driving power chip, and transformer 305, rectifier diode 306, output capacitance 307 and LED load 308 consist of the load blocks of driving power chip.
In the present embodiment, the driving power chip internal comprises a clock 313, and when each clock cycle began, control logic circuit 314 output SET signals made rest-set flip-flop be output as height, make power switch 309 open-minded by driving buffer circuit 316.From draining 319 to source electrode 318 current flowings, form current sampling signal in the power switch 309, this current sampling signal flows to circuit ground by sampling resistor 310, produces a voltage signal at sampling resistor 310.This current sampling signal is connected to temperature control circuit 311, the current sampling signal that process temperature control circuit 311 was processed is connected to the in-phase input end of current comparator 312, the reverse input end of current comparator 312 connects the reference voltage of reference voltage module 317, when the current sampling signal of processing through temperature control circuit 311 equals reference voltage signal, current comparator 312 is output as height, rest-set flip-flop 315 outputs are become low, by driving buffer circuit 316 power switch 309 is closed.When the next clock cycle arrived, power switch 309 was again open-minded, and so each switch periods is gone round and begun again, so that the output current of led drive circuit is controlled.The rest-set flip-flop here also can adopt other logical circuits to realize, can be referred to as the driving switch control module, following examples are also like this.
Concrete, as shown in Figure 6, temperature control circuit 311 detects the driving power chip temperatures, when the driving power chip temperature less than temperature adjusting threshold value C
0The time, do not change current sampling signal I, when the driving power chip temperature is higher than C
0The time, amplify or increase current sampling signal through temperature control circuit 311, form I
' , so that the output current of led drive circuit and system power reduction, thereby the brightness of lowering the LED lamp is lighted but keep the LED lamp.
The 3rd embodiment
As shown in Figure 7, the LED driving power control circuit that the present embodiment has the temperature adjusting function comprises power switch 309, sampling resistor 310, reference voltage module 317, temperature control circuit 311, current comparator 312, clock 313, control logic circuit 314, rest-set flip-flop 315 and driving buffer circuit 316.Such as front embodiment, rectifier bridge 301, input filter capacitor 302, supplying resistance 303 and partially installing capacitor 304 consist of the supply module of driving power chip, and transformer 305, rectifier diode 306, output capacitance 307 and LED load 308 consist of the load blocks of driving power chip.
In the present embodiment, the driving power chip internal comprises a clock 313, temperature control circuit 311 is connected to clock 313, when each clock cycle begins, control logic circuit 314 output SET signals make rest-set flip-flop 315 be output as height, make power switch 309 open-minded by driving buffer circuit 316.From draining 319 to source electrode 318 current flowings, this electric current flows to circuit ground by sampling resistor 310 in the power switch 309, forms current sampling signal, produces a voltage signal at sampling resistor 310.This current sampling signal is connected to the in-phase input end of current comparator 312, the reverse input end of current comparator 312 connects the reference voltage signal of reference voltage module 317, when current sampling signal equals reference voltage signal, current comparator 312 is output as height, rest-set flip-flop 315 outputs are become low, by driving buffer circuit 316 power switch 309 is closed.When the next clock cycle arrived, power switch 309 was again open-minded, and so each switch periods is gone round and begun again, so that the output current of led drive circuit is controlled.
As shown in Figure 8, temperature control circuit 311 detects the driving power chip temperature, as driving power chip temperature Cv during less than certain pre-set threshold value, do not change clock frequency fc, when driving power chip temperature Cv is higher than this pre-set threshold value, reduce clock frequency fc, so that the output current of led drive circuit and system power reduce, thereby lower the brightness of LED lamp, light but keep the LED lamp.
In above embodiment, transformer 305 also can replace with inductance.As shown in Figure 9, the transformer among the first embodiment replaces with inductance, adopts the buck topology, and the temperature adjusting mode is identical with the first embodiment.
Be applied to the control circuit of above-described embodiment, the present invention has the LED driving power control method of temperature adjusting function, by system temperature is sampled, and with resulting temperature signal through the temperature control circuit computing, and then change the reference voltage of current comparator, perhaps change the amplitude of current sampling signal, perhaps change system clock frequency, with the average current of change transformer primary side, thereby the power of change LED driving power obtains the effect that closed loop thermal is controlled.
Above embodiment is the anti-topology that swashs, and the present invention is also applicable to buck topology, and Boost topology or buck are topological.
Figure 10 is a kind of implementation schematic diagram of temperature control circuit of the present invention.Come the temperature of detection system according to the negative temperature coefficient of transistor base and emitter pressure reduction (Vbe).When chip temperature rises to a set point, VOUT1 (=VC1) begin to be lower than overheated reference voltage, begin to produce on the resistance R 1 one with the directly proportional electric current of temperature, jointing temp regulation and control reference voltage 402 on the resistance R 1.This electric current is by current mirror 401 outputs, and the formation temperature regulate electrical current exports 403, removes to change the reference voltage of current comparator, perhaps changes the amplitude of current sampling signal, perhaps changes system clock frequency.
Figure 11 is according to the LED driving power chip temperature of above embodiment and the waveform schematic diagram of output current.After temperature rose to the overtemperature protection threshold values, temperature control circuit began to reduce the transformer primary side electric current, thereby reduced LED driving power power and output current; system loss is minimized; rate of rise in temperature is descended, reach at last temperature closed loop, realize the control of system temperature.
Described in this specification is preferred embodiment of the present invention, and above embodiment is only in order to illustrate technical scheme of the present invention but not limitation of the present invention.All those skilled in the art all should be within the scope of the present invention under this invention's idea by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (13)
1. LED driving power control circuit, supply module provides direct voltage for described LED driving power control circuit, described LED driving power control circuit drives and the control load module, it is characterized in that, described LED driving power control circuit comprises temperature control circuit, reference voltage, power switch and sampling resistor, described load blocks links to each other with the drain electrode of described power switch, the source electrode of described power switch links to each other with an end of described sampling resistor, the other end connection circuit ground of described sampling resistor, described temperature control circuit detects described LED driving power temperature, when the temperature of described LED driving power is elevated to temperature threshold, the power output of control LED driving power.
2. LED driving power control circuit according to claim 1, it is characterized in that, also comprise current comparator, clock, the driving switch control module, control logic circuit and driving buffer circuit, described clock provides clock signal for described control logic circuit, described driving switch control module receives the output signal of described current comparator and described control logic circuit, and the output control signal is given described driving buffer circuit, described driving buffer circuit output signal connects the gate pole of described power switch, the described driving switch control module of described temperature control circuit indirectly control.
3. LED driving power control circuit according to claim 2, it is characterized in that, the input of described temperature control circuit links to each other with described reference voltage, the output of described temperature control circuit links to each other with an input of described current comparator, and described sampling resistor links to each other with another input of described current comparator.
4. LED driving power control circuit according to claim 2, it is characterized in that, the input of described temperature control circuit links to each other with described sampling resistor, the output of described temperature control circuit links to each other with an input of described current comparator, and described reference voltage links to each other with another input of described current comparator.
5. LED driving power control circuit according to claim 2 is characterized in that, described temperature control circuit links to each other with described clock circuit.
6. LED driving power control circuit according to claim 2 is characterized in that, described temperature control circuit comes the temperature of detection system according to the negative temperature coefficient of transistor base and emitter pressure reduction.
7. LED driving power control circuit according to claim 1, it is characterized in that, described supply module comprises rectifier bridge, input filter capacitor, supplying resistance and partially installing capacitor, described rectifier bridge input termination ac input end, described rectification bridge output end connects described input filter capacitor.
8. LED driving power control circuit according to claim 7, it is characterized in that, described load blocks comprises potential device, rectifier diode, output capacitance and LED load, the described input filter capacitor of described potential device one termination, the drain electrode of the described power switch of another termination, the described rectifier diode of another termination of described potential device and described output capacitance.
9. LED driving power control circuit according to claim 8 is characterized in that, described potential device is transformer or inductance.
10. a right to use requires the control method of 1 or 2 described LED control circuits, it is characterized in that, the described LED driving power temperature that detects according to described temperature control circuit, control the output current of described LED control circuit, the power of control load module.
11. a right to use requires the control method of 3 described LED control circuits, it is characterized in that, control the reference voltage of described current comparator by described temperature control circuit, to control the output current of described LED control circuit, the power of control load module.
12. a right to use requires the control method of 4 described LED control circuits, it is characterized in that, control current sampling signal on the described sampling resistor by described temperature control circuit, to control the output current of described LED control circuit, the power of control load module.
13. a right to use requires the control method of 5 described LED control circuits, it is characterized in that, control described clock frequency by described temperature control circuit, to control the output current of described LED control circuit, the power of control load module.
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| CN2012103255198A CN102869155A (en) | 2012-09-06 | 2012-09-06 | LED (light-emitting diode) driving source control circuit and control method thereof |
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| CN103281835A (en) * | 2013-06-06 | 2013-09-04 | 东莞博用电子科技有限公司 | LED over-temperature protection circuit applied to alternative current LED drive system |
| CN103327694A (en) * | 2013-06-26 | 2013-09-25 | 上海晶丰明源半导体有限公司 | Silicon controlled dimming LED drive circuit |
| CN103402285A (en) * | 2013-07-08 | 2013-11-20 | 郑儒富 | Control circuit of LED (Light-emitting Diode) driver and control method thereof |
| CN103747587A (en) * | 2014-01-15 | 2014-04-23 | 西北工业大学 | LED (Light Emitting Diode) lamp radiator temperature online self-adaptation control circuit and method |
| CN103997811A (en) * | 2013-02-18 | 2014-08-20 | 松下电器产业株式会社 | Lighting device and lighting fixture |
| CN104023446A (en) * | 2014-06-16 | 2014-09-03 | 朱威 | Power source control device for indoor illuminating lamp |
| CN104023446B (en) * | 2014-06-16 | 2016-11-30 | 朱威 | A kind of power control of indoor illumination |
| CN107396500A (en) * | 2017-08-28 | 2017-11-24 | 盐城莱廷绍工业技术有限公司 | A kind of programmable a variety of electric current output LED drive circuits |
| CN108282916A (en) * | 2018-01-25 | 2018-07-13 | 常州众合劲能电源有限公司 | Power supply high-temperature protection method, circuit and LED illuminator |
| CN109196951A (en) * | 2016-06-10 | 2019-01-11 | 伊顿智能动力有限公司 | The electric current of light emitting diode lighting equipment is adjusted back |
| CN110392467A (en) * | 2019-07-08 | 2019-10-29 | 杰华特微电子（杭州）有限公司 | LED control circuit and control method |
| CN111955055A (en) * | 2018-04-10 | 2020-11-17 | 株式会社小糸制作所 | Vehicle lamp, lighting circuit, driving circuit, and driving integrated light source thereof |
| CN112333872A (en) * | 2015-02-20 | 2021-02-05 | 豪倍公司 | Light-emitting diode heat return control device and method |
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| CN103997811A (en) * | 2013-02-18 | 2014-08-20 | 松下电器产业株式会社 | Lighting device and lighting fixture |
| CN103281835B (en) * | 2013-06-06 | 2015-04-01 | 东莞博用电子科技有限公司 | LED over-temperature protection circuit applied to alternative current LED drive system |
| CN103281835A (en) * | 2013-06-06 | 2013-09-04 | 东莞博用电子科技有限公司 | LED over-temperature protection circuit applied to alternative current LED drive system |
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| CN103281836B (en) * | 2013-06-06 | 2015-04-01 | 东莞博用电子科技有限公司 | Chip over-temperature protection circuit applied to alternative current LED drive system |
| CN103327694A (en) * | 2013-06-26 | 2013-09-25 | 上海晶丰明源半导体有限公司 | Silicon controlled dimming LED drive circuit |
| CN103327694B (en) * | 2013-06-26 | 2015-07-22 | 上海晶丰明源半导体有限公司 | Silicon controlled dimming LED drive circuit |
| CN103402285A (en) * | 2013-07-08 | 2013-11-20 | 郑儒富 | Control circuit of LED (Light-emitting Diode) driver and control method thereof |
| CN103747587B (en) * | 2014-01-15 | 2016-03-30 | 西北工业大学 | A kind of LED lamp radiator temperature online adaptation control circuit |
| CN103747587A (en) * | 2014-01-15 | 2014-04-23 | 西北工业大学 | LED (Light Emitting Diode) lamp radiator temperature online self-adaptation control circuit and method |
| CN104023446B (en) * | 2014-06-16 | 2016-11-30 | 朱威 | A kind of power control of indoor illumination |
| CN104023446A (en) * | 2014-06-16 | 2014-09-03 | 朱威 | Power source control device for indoor illuminating lamp |
| CN112333872A (en) * | 2015-02-20 | 2021-02-05 | 豪倍公司 | Light-emitting diode heat return control device and method |
| CN109196951A (en) * | 2016-06-10 | 2019-01-11 | 伊顿智能动力有限公司 | The electric current of light emitting diode lighting equipment is adjusted back |
| CN107396500A (en) * | 2017-08-28 | 2017-11-24 | 盐城莱廷绍工业技术有限公司 | A kind of programmable a variety of electric current output LED drive circuits |
| CN108282916A (en) * | 2018-01-25 | 2018-07-13 | 常州众合劲能电源有限公司 | Power supply high-temperature protection method, circuit and LED illuminator |
| CN111955055B (en) * | 2018-04-10 | 2023-02-28 | 株式会社小糸制作所 | Vehicle lamp and lighting circuit thereof |
| CN111955055A (en) * | 2018-04-10 | 2020-11-17 | 株式会社小糸制作所 | Vehicle lamp, lighting circuit, driving circuit, and driving integrated light source thereof |
| US11602029B2 (en) | 2018-04-10 | 2023-03-07 | Koito Manufacturing Co., Ltd. | Automotive lamp |
| US11612034B2 (en) | 2018-04-10 | 2023-03-21 | Koito Manufacturing Co., Ltd. | Automotive lamp |
| CN110392467A (en) * | 2019-07-08 | 2019-10-29 | 杰华特微电子（杭州）有限公司 | LED control circuit and control method |
| CN110392467B (en) * | 2019-07-08 | 2024-03-22 | 杰华特微电子股份有限公司 | LED control circuit and control method |
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Application publication date: 20130109 |