CN202396030U - LED driving device, battery charger and driving control circuit - Google Patents
LED driving device, battery charger and driving control circuit Download PDFInfo
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- CN202396030U CN202396030U CN2011203995371U CN201120399537U CN202396030U CN 202396030 U CN202396030 U CN 202396030U CN 2011203995371 U CN2011203995371 U CN 2011203995371U CN 201120399537 U CN201120399537 U CN 201120399537U CN 202396030 U CN202396030 U CN 202396030U
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Abstract
The utility model relates to an LED driving device, a battery charger and a driving control circuit. The driving control circuit comprises a buck switch power supply module that is connected with an input power supply, a detecting device used for detecting real-time current, and a PWM controller that is used for controlling the work state of the buck switch power supply module based on detecting signals obtained from the detecting device. The detecting device is connected with a load in series, and the detecting device and the series circuit of the load are connected to the output terminal of the buck switch power supply module in parallel. The current of the load is reflected directly by the detecting signals of the driving control circuit, thereby guaranteeing the accuracy and the reliability of the detecting signals. No complex calculation is needed to make the design of the PWM controller simple, thereby reducing the cost for the design of the PWM controller. In addition, according to the technical solution of the utility model, no special requirement is needed for the PWM controller, and various control ICs such as a common boost/buck constant current /constant voltage PWM control IC can be adopted for realization, so that the circuit is fine in universality and low in cost.
Description
Technical field
The utility model relates to load driving circuits, more particularly, relates to a kind of Drive and Control Circuit that load provides constant current or constant voltage source that is used to.
Background technology
In application many power consumption equipments for example LED lamp etc. need good stability power supply as its driving power, for example require constant current or constant voltage source.Normally through load current is detected, and detection signal is fed back to for example pwm chip of control IC chip, power module is regulated and control by the control IC chip, thus output constant current or constant voltage source.
Be the constant-current driving control circuit of prior art shown in Figure 1A, Fig. 2 A and Fig. 3 A, wherein, the detecting device is for example detected resistance and is not directly connected in load, and what obtain through it is indirect detection signal, does feedback after the conversion and uses.This indirect detection signal is the reflected load electric current exactly.
In the circuit shown in Figure 1A, its detecting current is an indirect current, and detection signal ISEN is the reflected load electric current directly.The detecting resistance R 17 of the PWM controller in this circuit (for example control IC chip) can only work in metal-oxide-semiconductor Q3 conduction period, and the detecting resistance R 17 of this circuit control IC can not work after metal-oxide-semiconductor Q3 closed.Designing requirement to IC is higher.This circuit must operate at continuous mode just can carry out correct current sense, could guarantee the accuracy of detecting preferably at degree of depth continuous mode.The real work test error is bigger.In addition, the switching noise that produces during the metal-oxide-semiconductor switch also has very big interference to the current sense of this circuit, the accuracy of influence detecting.
Figure 1B is the oscillogram of detection signal ISEN and the load current under connection mode of circuit shown in Figure 1A, and wherein, the straight line waveform is the oscillogram of load current, and sawtooth waveform is the oscillogram of detection signal ISEN.
In the circuit shown in Fig. 2 A, detecting resistance R 1 also is indirect detecting, and its detecting current is an indirect current, and it is actual to be inductive current.This circuit is under non-continuous mode, and very high to the computing capability requirement of IC, error also can be very big.In addition, in this circuit because the influence of the switching noise interference signal of metal-oxide-semiconductor and diode makes that the accuracy of detection signal is poorer.
Fig. 2 B is detection signal ISEN and the oscillogram of load current of circuit shown in Fig. 2 A under continuous mode, and wherein, the straight line waveform is the oscillogram of load current.
Fig. 2 C is detection signal ISEN and the oscillogram of load current of circuit shown in Fig. 2 A under non-continuous mode, and wherein, the straight line waveform is the oscillogram of load current.
The characteristics of circuit shown in Fig. 3 A are actual with the circuit shown in Figure 1A to be identical, and only work is just comparatively reliable under continuous mode, and IC is had relatively high expectations.The shortcoming of this circuit is that institute's detecting current is an indirect current, and circuit must operate at the accuracy that continuous mode could guarantee detecting.Actual error is very big.
Fig. 3 B is detection signal ISEN and the oscillogram of load current of circuit shown in Fig. 3 A under continuous mode, and wherein, the straight line waveform is the oscillogram of load current.
Therefore, need a kind ofly to control simple and the accurately method and the device of sensing load current.
The utility model content
The technical problem that the utility model will solve is; To the constant-current driving control circuit of prior art sensing load current indirectly; Have the defective of control chip and design complicacy, detection signal accuracy difference, a kind of Drive and Control Circuit is provided, it is sensing load current directly.
Another technical problem that the utility model will solve is; To the constant-current driving control circuit of prior art sensing load current indirectly; The defective that has control chip and design complicacy, detection signal accuracy difference; A kind of LED drive unit is provided, and Drive and Control Circuit wherein is sensing load current directly.
The technical problem again that the utility model will solve is; To the constant-current driving control circuit of prior art sensing load current indirectly; The defective that has control chip and design complicacy, detection signal accuracy difference; A kind of battery charger is provided, and Drive and Control Circuit wherein is sensing load current directly.
The utility model solves the technical scheme that its technical problem adopted: construct a kind of Drive and Control Circuit; Comprise and the adjusting and voltage-reduction switch power module that is connected of input power supply, the PWM controller that is used to detect the detecting device of load real-time current and controls the operating state of said adjusting and voltage-reduction switch power module based on the detection signal that obtains from said detecting device; Wherein, Said detecting device is connected with load, and the series circuit of said detecting device and load is parallel to the output of said adjusting and voltage-reduction switch power module.
In the described Drive and Control Circuit of the utility model, said adjusting and voltage-reduction switch power module comprises switching device, fly-wheel diode and energy storage inductor; Wherein, the power connector end of the said switching device controlled end that is connected in said input positive source, said switching device is connected in the pwm control signal output of said PWM controller; The first detection signal input of said PWM controller is connected with the detection signal output of said detecting device; The negative pole of said fly-wheel diode is connected in the load link of said switching device; The first end ground connection of the positive pole of said fly-wheel diode and said energy storage inductor, second end of the negative pole of said fly-wheel diode and said energy storage inductor constitutes the output of said adjusting and voltage-reduction switch power module.
In the described Drive and Control Circuit of the utility model, be connected with filter capacitor between second end of the negative pole of said fly-wheel diode and said energy storage inductor.
In the described Drive and Control Circuit of the utility model, said detecting device is resistor or current mirror, and said switching device is metal-oxide-semiconductor or triode.
In the described Drive and Control Circuit of the utility model, said switching device is that metal-oxide-semiconductor, said detecting device are resistor, and second end that first end of said resistor is connected in load positive pole, said resistor is connected in the negative pole of said fly-wheel diode; Wherein, the detection signal output of said detecting device is first end of said resistor; The power connector end of said switching device is that the load link of the drain electrode of said metal-oxide-semiconductor, said switching device is that the controlled end of the source electrode of said metal-oxide-semiconductor, said switching device is the grid of said metal-oxide-semiconductor, and the reference potential of PWM controller 40 is identical with the current potential of second end of resistor R.
In the described Drive and Control Circuit of the utility model, said switching device is that metal-oxide-semiconductor, said detecting device are resistor, and second end that first end of said resistor is connected in load positive pole, said resistor is connected in the negative pole of said fly-wheel diode; Wherein, the detection signal output of said detecting device is second end of said resistor; The power connector end of said switching device is that the load link of the drain electrode of said metal-oxide-semiconductor, said switching device is that the controlled end of the source electrode of said metal-oxide-semiconductor, said switching device is the grid of said metal-oxide-semiconductor, and the reference potential of PWM controller 40 is identical with the current potential of first end of resistor R.
In the described Drive and Control Circuit of the utility model,
Said switching device is that triode, said detecting device are resistor, and second end that first end of said resistor is connected in load positive pole, said resistor is connected in the negative pole of said fly-wheel diode; Wherein, the detection signal output of said detecting device is first end of said resistor; The power connector end of said switching device is that the load link of the collector electrode of said triode, said switching device is that the controlled end of the emitter of said triode, said switching device is the base stage of said triode, and the reference potential of PWM controller 40 is identical with the current potential of second end of resistor R; Perhaps
Said switching device is that triode, said detecting device are resistor, and second end that first end of said resistor is connected in load positive pole, said resistor is connected in the negative pole of said fly-wheel diode; Wherein, the detection signal output of said detecting device is second end of said resistor; The power connector end of said switching device is that the load link of the collector electrode of said triode, said switching device is that the controlled end of the emitter of said triode, said switching device is the base stage of said triode, and the reference potential of PWM controller 40 is identical with the current potential of first end of resistor R.
In the described Drive and Control Circuit of the utility model, also comprise the resistor voltage divider circuit that is used to detect the load real-time voltage, said resistor voltage divider circuit is parallel to said load, or is parallel to the series circuit of said detecting device and load; The detection signal output of said resistor voltage divider circuit is connected in the second detection signal input of said PWM controller.
The utility model solves another technical scheme that its technical problem adopted: construct a kind of LED drive unit, comprise above-mentioned Drive and Control Circuit, wherein said load is a led module.
The utility model solves the technical scheme again that its technical problem adopted: construct a kind of battery charger, comprise above-mentioned Drive and Control Circuit, wherein said load is for being recharged battery.
Implement the Drive and Control Circuit of the utility model; Has following beneficial effect: because the detecting device is directly connected with load in the Drive and Control Circuit of the utility model; The direct reaction load electric current of the detection signal of gained has guaranteed accuracy, the reliability of detection signal; In addition, need not complicated calculating in the technical scheme of the utility model, make the simplicity of design of PWM controller, thereby reduced the design cost of PWM controller; Have the technical scheme of the utility model that the PWM controller is not had specific (special) requirements again, can adopt various control IC to realize, for example common lifting/voltage reducing constant current/constant voltage PWM control IC can be used, thereby versatility is good, and circuit cost is low.
The Drive and Control Circuit of the utility model can also be carried out the control of constant voltage and constant-current driving simultaneously, and overvoltage protection can be provided, and promptly wants constant current also to want the demand of the equipment of constant voltage to satisfy some.
Description of drawings
To combine accompanying drawing and embodiment that the utility model is described further below, in the accompanying drawing:
Figure 1A is depicted as the constant-current driving control circuit figure of prior art first embodiment;
Figure 1B is the oscillogram of detection signal ISEN and the load current under connection mode of circuit shown in Figure 1A;
Fig. 2 A is depicted as the prior art second embodiment constant-current driving control circuit figure;
Fig. 2 B is detection signal ISEN and the oscillogram of load current of circuit shown in Fig. 2 A under continuous mode.
Fig. 2 C is detection signal ISEN and the oscillogram of load current of circuit shown in Fig. 2 A under non-continuous mode.
Fig. 3 A is depicted as the constant-current driving control circuit figure of prior art the 3rd embodiment;
Fig. 3 B is detection signal ISEN and the oscillogram of load current of circuit shown in Fig. 3 A under continuous mode.
Fig. 4 is the block diagram of the Drive and Control Circuit of the utility model;
Fig. 5 is the circuit theory diagrams of the Drive and Control Circuit of the utility model first embodiment;
Fig. 6 is the circuit theory diagrams of the Drive and Control Circuit of the utility model second embodiment;
Fig. 7 is the circuit theory diagrams of the Drive and Control Circuit of the utility model the 3rd embodiment;
Fig. 8 is the circuit theory diagrams of the Drive and Control Circuit of the utility model the 4th embodiment.
Embodiment
A kind of directly Drive and Control Circuit of sensing load current of the utility model design can be applied to various constant currents or constant voltage control appliance/device, and for example battery charge, LED drive or the like.Adopted the step-down framework different in the Drive and Control Circuit of the utility model, specifically adopted adjusting and voltage-reduction switch power module with a kind of special P WM step-down framework with traditional approach.
As shown in Figure 4, the Drive and Control Circuit of the utility model comprises the adjusting and voltage-reduction switch power module 20 that is connected with input power supply 10, and detecting device 30 and PWM controller 40.Detecting device 30 is connected with load 50, is used to detect the load real-time current; The series circuit of detecting device 30 and load 50 is parallel to the output of adjusting and voltage-reduction switch power module 20.The input of PWM controller 40 is connected in detecting device 30, output is connected in adjusting and voltage-reduction switch power module 20, is used for the operating state based on the detection signal control adjusting and voltage-reduction switch power module 20 that obtains from detecting device 30.
In the technical scheme of the utility model, the input power supply can be a various ways, comprises that DC power supply, AC power are through DC power supply behind the rectifying and wave-filtering or the alternation power supply of AC power behind over commutation etc.
Like Fig. 5 and shown in Figure 6, adjusting and voltage-reduction switch power module 20 comprises switching device Q, sustained diode and energy storage inductor L.Wherein, the power connector end of said switching device Q is connected in the VIN end of input power supply 10, the controlled end of switching device Q is connected in the pwm control signal output of PWM controller 40; The first detection signal input of PWM controller 40 is connected with the detection signal output of detecting device (the for example resistor R shown in the figure); The negative pole of sustained diode is connected in the load link of switching device Q, the equal ground connection of first end of the positive pole of sustained diode and energy storage inductor L, and second end of the negative pole of sustained diode and energy storage inductor L constitutes the output of adjusting and voltage-reduction switch power module 20.
In Fig. 5 and embodiment shown in Figure 6, be connected with filter capacitor C between second end of the negative pole of sustained diode and energy storage inductor L.Need to prove that filter capacitor C is optional, in other embodiments, also filter capacitor C can be set.
In the technical scheme of the utility model; The operating state of adjusting and voltage-reduction switch power module 20 comprises the state of switching device Q connection and the state that switching device Q turn-offs; Come the logical and disconnected duration of control switch device through pwm control signal, thereby constant current or constant voltage source are provided to load.Through load current is detected, and detection signal is fed back to the PWM controller, calculate and/or handle, draw the on/off duration of needed switching device, give switching device Q thereby send corresponding PWM through the PWM controller.
In Fig. 5 and embodiment shown in Figure 6, energy storage inductor L can be common inductance or coil, also can be various ways such as transformer type inductance; Switching device Q can be various ways such as metal-oxide-semiconductor, triode or relay switch.Load 50 can be the various equipment that need constant current/constant voltage to control, device etc., for example includes but not limited to LED, battery etc.The power supply VCC of PWM controller can be a various ways, comprises charge pump, inductance ancillary coil and linear power supply or the like.
In the embodiment shown in fig. 5; The detection signal output of detecting device is the link (being called first end of resistor R) of resistor R and load 50 positive poles; Gained detection signal ISEN is a negative voltage signal, need do feedback usefulness after treatment, such as doing stack direct current biasing or voltage reversal or the like; Can handle at chip internal, also can externally handle.For example, for external treatment, can between first end of the first detection signal input of PWM controller 40 and resistor R, direct current biasing supercircuit or voltage reversal circuit be set.
Be connected in for the first detection signal input of the PWM controller 40 shown in Fig. 5 in the scheme of first end of resistor R; It is identical with the reference potential of second end of resistor R that PWM controller 40 reference potentials are set to, i.e. link to each other with second end of resistor R to the reference of PWM controller 40.
In the embodiment shown in fig. 6, the detection signal output of detecting device is the link (being called second end of resistor R) of resistor R and sustained diode, and gained detection signal ISEN is positive current sense signal.
Be connected in for the first detection signal input of the PWM controller 40 shown in Fig. 6 in the scheme of second end of resistor R; It is identical with the reference potential of first end of resistor R that PWM controller 40 reference potentials are set to, i.e. link to each other with first end of resistor R to the reference of PWM controller 40.
In Fig. 5 and embodiment shown in Figure 6, the waveform characteristics are: the current signal of complete direct ratio of voltage signal and load 50 on the resistor R.
In the embodiment shown in fig. 7, except a parallelly connected resistor voltage divider circuit that is used to detect the load real-time voltage on the series circuit of detecting device and load (contacted constitute by resistance R 1 and R2), remainder is with embodiment illustrated in fig. 5 identical.As shown in Figure 7, the detection signal output of resistor voltage divider circuit is connected in PWM controller 40, is used for detecting voltage signal VSEN is sent to the second detection signal input of PWM controller.
In embodiment shown in Figure 8, except parallel connection in load resistor voltage divider circuit (constituting) that is used to detect the load real-time voltage by resistance R 1 and R2 polyphone, remainder is with embodiment illustrated in fig. 6 identical.As shown in Figure 8, the detection signal output of resistor voltage divider circuit is connected in PWM controller 40, is used for detecting voltage signal VSEN is sent to the second detection signal input of PWM controller.
As is known to the person skilled in the art, the quantity of resistance is not limited to two shown in Fig. 7 and Fig. 8 in the resistor voltage divider circuit, for example can also adopt 3 to 5 or more resistance formation.Fig. 7 and Drive and Control Circuit embodiment illustrated in fig. 8 except the constant current constant voltage driving can be provided, also have the effect that overvoltage protection can be provided.
Alternatively, in other embodiments, resistor R can substitute as the detecting device with current mirror, also can use other directly suitable modes of sensing load current, but residing position is identical in circuit.When using current mirror as the detecting device, the detection signal input of PWM controller 40 is connected with the image current output of current mirror.
It is worthy of note that detecting device for example resistor R or current mirror also can be connected between the negative pole of second end and load 50 of energy storage inductor L.Certainly in this case, the reference potential of PWM controller also need be done corresponding adjustment.
As previously mentioned, load 50 can be the various equipment that need constant current/constant voltage to control, device etc., for example includes but not limited to LED, battery etc.Therefore, the Drive and Control Circuit of the utility model can be applied to LED light fixture, battery charger etc.
The maximum advantage of the Drive and Control Circuit of the utility model is exactly direct sensing load current; Guaranteed the accuracy of detecting; Reliability; And to the not restriction of mode of operation of reduction voltage circuit, promptly no matter Drive and Control Circuit is operated in continuous mode, non-continuous mode or critical conduction mode, sensing load current exactly.In addition, the control IC simplicity of design does not have specific (special) requirements, common boost or voltage-dropping type constant current or constant voltage control IC can be used.
Claims (10)
1. Drive and Control Circuit; It is characterized in that; Comprise and the adjusting and voltage-reduction switch power module that is connected of input power supply, the PWM controller that is used to detect the detecting device of load real-time current and controls the operating state of said adjusting and voltage-reduction switch power module based on the detection signal that obtains from said detecting device; Wherein, said detecting device is connected with load, and the series circuit of said detecting device and load is parallel to the output of said adjusting and voltage-reduction switch power module.
2. Drive and Control Circuit according to claim 1 is characterized in that, said adjusting and voltage-reduction switch power module comprises switching device, fly-wheel diode and energy storage inductor; Wherein, the power connector end of the said switching device controlled end that is connected in said input positive source, said switching device is connected in the pwm control signal output of said PWM controller; The first detection signal input of said PWM controller is connected with the detection signal output of said detecting device; The negative pole of said fly-wheel diode is connected in the load link of said switching device; The first end ground connection of the positive pole of said fly-wheel diode and said energy storage inductor, second end of the negative pole of said fly-wheel diode and said energy storage inductor constitutes the output of said adjusting and voltage-reduction switch power module.
3. Drive and Control Circuit according to claim 2 is characterized in that, is connected with filter capacitor between second end of the negative pole of said fly-wheel diode and said energy storage inductor.
4. according to claim 2 or 3 described Drive and Control Circuit, it is characterized in that said detecting device is resistor or current mirror, said switching device is metal-oxide-semiconductor or triode.
5. according to claim 2 or 3 described Drive and Control Circuit; It is characterized in that; Said switching device is that metal-oxide-semiconductor, said detecting device are resistor, and second end that first end of said resistor is connected in load positive pole, said resistor is connected in the negative pole of said fly-wheel diode; Wherein, the detection signal output of said detecting device is first end of said resistor; The power connector end of said switching device is that the load link of the drain electrode of said metal-oxide-semiconductor, said switching device is that the controlled end of the source electrode of said metal-oxide-semiconductor, said switching device is the grid of said metal-oxide-semiconductor, and the reference potential of PWM controller is identical with the current potential of second end of resistor.
6. according to claim 2 or 3 described Drive and Control Circuit; It is characterized in that; Said switching device is that metal-oxide-semiconductor, said detecting device are resistor, and second end that first end of said resistor is connected in load positive pole, said resistor is connected in the negative pole of said fly-wheel diode; Wherein, the detection signal output of said detecting device is second end of said resistor; The power connector end of said switching device is that the load link of the drain electrode of said metal-oxide-semiconductor, said switching device is that the controlled end of the source electrode of said metal-oxide-semiconductor, said switching device is the grid of said metal-oxide-semiconductor, and the reference potential of PWM controller is identical with the current potential of first end of resistor.
7. according to claim 2 or 3 described Drive and Control Circuit, it is characterized in that,
Said switching device is that triode, said detecting device are resistor, and second end that first end of said resistor is connected in load positive pole, said resistor is connected in the negative pole of said fly-wheel diode; Wherein, the detection signal output of said detecting device is first end of said resistor; The power connector end of said switching device is that the load link of the collector electrode of said triode, said switching device is that the controlled end of the emitter of said triode, said switching device is the base stage of said triode, and the reference potential of PWM controller is identical with the current potential of second end of resistor; Perhaps
Said switching device is that triode, said detecting device are resistor, and second end that first end of said resistor is connected in load positive pole, said resistor is connected in the negative pole of said fly-wheel diode; Wherein, the detection signal output of said detecting device is second end of said resistor; The power connector end of said switching device is that the load link of the collector electrode of said triode, said switching device is that the controlled end of the emitter of said triode, said switching device is the base stage of said triode, and the reference potential of PWM controller is identical with the current potential of first end of resistor.
8. according to claim 2 or 3 described Drive and Control Circuit; It is characterized in that; Also comprise the resistor voltage divider circuit that is used to detect the load real-time voltage, said resistor voltage divider circuit is parallel to said load, or is parallel to the series circuit of said detecting device and load; The detection signal output of said resistor voltage divider circuit is connected in the second detection signal input of said PWM controller.
9. a LED drive unit is characterized in that, comprises that wherein said load is a led module like each described Drive and Control Circuit in the claim 1 to 8.
10. a battery charger is characterized in that, comprises that wherein said load is for being recharged battery like each described Drive and Control Circuit in the claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203995371U CN202396030U (en) | 2011-10-19 | 2011-10-19 | LED driving device, battery charger and driving control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203995371U CN202396030U (en) | 2011-10-19 | 2011-10-19 | LED driving device, battery charger and driving control circuit |
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| CN202396030U true CN202396030U (en) | 2012-08-22 |
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| CN2011203995371U Expired - Fee Related CN202396030U (en) | 2011-10-19 | 2011-10-19 | LED driving device, battery charger and driving control circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103687143A (en) * | 2012-09-12 | 2014-03-26 | 硕颉科技股份有限公司 | Light-emitting diode driving device |
| WO2014187004A1 (en) * | 2013-05-20 | 2014-11-27 | 深圳市华星光电技术有限公司 | Led backlight driving circuit, backlight module, and liquid crystal display apparatus |
| CN104507220A (en) * | 2014-12-16 | 2015-04-08 | 苏州东微半导体有限公司 | High-efficiency LED (Light Emitting Diode) drive control circuit |
| US9237609B2 (en) | 2013-05-20 | 2016-01-12 | Shenzhen China Star Optoelectronics Technology Co., Ltd | LED backlight driving circuit, backlight module, and LCD device |
| CN108337780A (en) * | 2018-03-30 | 2018-07-27 | 厦门通士达照明有限公司 | A kind of intelligent drive circuit and LED lamp |
-
2011
- 2011-10-19 CN CN2011203995371U patent/CN202396030U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103687143A (en) * | 2012-09-12 | 2014-03-26 | 硕颉科技股份有限公司 | Light-emitting diode driving device |
| CN103687143B (en) * | 2012-09-12 | 2015-08-05 | 硕颉科技股份有限公司 | Light emitting diode drive device |
| WO2014187004A1 (en) * | 2013-05-20 | 2014-11-27 | 深圳市华星光电技术有限公司 | Led backlight driving circuit, backlight module, and liquid crystal display apparatus |
| US9237609B2 (en) | 2013-05-20 | 2016-01-12 | Shenzhen China Star Optoelectronics Technology Co., Ltd | LED backlight driving circuit, backlight module, and LCD device |
| CN104507220A (en) * | 2014-12-16 | 2015-04-08 | 苏州东微半导体有限公司 | High-efficiency LED (Light Emitting Diode) drive control circuit |
| CN108337780A (en) * | 2018-03-30 | 2018-07-27 | 厦门通士达照明有限公司 | A kind of intelligent drive circuit and LED lamp |
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Granted publication date: 20120822 Termination date: 20131019 |