CN201518550U - LED light circuit and constant current circuit thereof - Google Patents
LED light circuit and constant current circuit thereof Download PDFInfo
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- CN201518550U CN201518550U CN2009202049854U CN200920204985U CN201518550U CN 201518550 U CN201518550 U CN 201518550U CN 2009202049854 U CN2009202049854 U CN 2009202049854U CN 200920204985 U CN200920204985 U CN 200920204985U CN 201518550 U CN201518550 U CN 201518550U
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Abstract
The utility model is suitable for the technical field of LED lighting, and provides an LED lighting circuit and a constant current circuit thereof, wherein the constant current circuit comprises a constant current control module and a constant current module. The constant current circuit comprises a constant current control module and a constant current module, the stability and the precision of the output current of the constant current circuit are high, and meanwhile, output efficiency is further improved.
Description
Technical field
The utility model belongs to the technical field of LED illumination, relates in particular to a kind of LED lighting circuit and constant-current circuit thereof.
Background technology
In recent years, LED has entered lighting field, uses more and more widely as architectural lighting, street lighting, Landscape Lighting, Sign Board, signal lamp etc.Constant-current circuit can provide constant current to LED, affects life-span and the reliability of LED.In technology was used now, the structure of constant-current circuit was to LED crosstalk resistance and adopts the three-terminal voltage-stabilizing device to form constant-current circuit, but the stability of existing constant-current circuit output current and low precision, efficient is low.
The utility model content
The purpose of this utility model is to provide a kind of constant-current circuit, is intended to solve stability and the low precision that there is output current in existing constant-current circuit, inefficient problem.
The utility model is achieved in that a kind of constant-current circuit, and described constant-current circuit comprises:
Be connected the constant current control module of output constant current control signal with LED;
The constant flow module that is connected with LED with described constant current control module, dc voltage input end respectively is according to the constant current control signal of described constant current control module output, to described LED output constant current.
In the said structure, described constant-current circuit also comprises the light-adjusting module that is connected with described constant current control module.
In the said structure, described constant-current circuit also comprises respectively the short-circuit protection module that is connected with LED with described light-adjusting module, constant current control module.
In the said structure; described constant current control module comprises constant current control chip U1; resistance R 1; resistance R 2; resistance R 3; resistance R 4; resistance R 6; resistance R 8; resistance R 9; resistance R 10; resistance R 13; resistance R 14; resistance R 16; resistance R 17; resistance R 18; capacitor C 1; capacitor C 2; capacitor C 3; capacitor C 4; capacitor C 5; capacitor C 6; voltage-stabiliser tube D2; field effect transistor Q2 and triode Q3; first end of the error amplifier inverting input connecting resistance R1 of constant current control chip U1; second termination power of resistance R 1; first end of the error amplifier output termination capacitor C 2 of constant current control chip U1; first end of second end, one road connecting resistance R1 of capacitor C 2; another road of second end of capacitor C 2 is by resistance R 2 ground connection; the multiplier input first via of constant current control chip U1 is by capacitor C 3 ground connection; the multiplier input the second tunnel of constant current control chip U1 connects power supply by resistance R 3; the multiplier input Third Road of constant current control chip U1 connects the drain electrode of field effect transistor Q2; first end of the current sampling terminating resistor R6 of constant current control chip U1; first end of the second terminating resistor R9 of resistance R 6; second end of resistance R 9 is by parallel resistor R14 and capacitor C 6 ground connection; the base stage of the second termination triode Q3 of resistance R 9; the collector electrode of triode Q3 is leaded up to resistance R 13 ground connection; another road of the collector electrode of triode Q3 connects the drain electrode of field effect transistor Q2; the emitter of triode Q3 is by resistance R 18 ground connection; the source electrode of field effect transistor Q2 is by resistance R 16 ground connection; the grid first via of field effect transistor Q2 is by resistance R 17 ground connection; the grid the second tunnel of field effect transistor Q2 is by capacitor C 5 ground connection; the grid Third Road of field effect transistor Q2 is by the resistance R 10 and the voltage-stabiliser tube D2 negative electrode and the short-circuit protection module that meet described LED of serial connection; the zero current sense terminal first via of described constant current control chip U1 connects described light-adjusting module; the zero current sense terminal the second tunnel of described constant current control chip U1 connects described constant flow module by the resistance R 8 and the capacitor C 4 of serial connection; the earth terminal ground connection of described constant current control chip U1; the output of described constant current control chip U1 connects described constant flow module by resistance R 4, the power supply termination power of described constant current control chip U1.
In the said structure, described constant flow module comprises field effect transistor Q1, resistance R 5, resistance R 7, diode D1 and inductance L 1, the grid of described field effect transistor Q1 connects described resistance R 4, the grid of described field effect transistor Q1 connects the source electrode of field effect transistor Q1 by described resistance R 5, the source electrode of described field effect transistor Q1 is leaded up to described resistance R 7 ground connection, another road of the source electrode of described field effect transistor Q1 connects second end of described resistance R 6, the drain electrode first via of described field effect transistor Q1 connects the anode of dc voltage input end and LED by described diode D1, the drain electrode the second tunnel of field effect transistor Q1 connects the negative electrode of LED by inductance L 1, and the drain electrode Third Road of field effect transistor Q1 meets inductance C4.
In the said structure; described light-adjusting module comprises triode Q4; triode Q5; resistance R 11; resistance R 12; resistance R 15 and capacitor C 7; the collector electrode of triode Q4 connects the zero current sense terminal of described constant current control chip U1; the grounded emitter of triode Q4; the base stage first via of triode Q4 connects the collector electrode of triode Q5; the base stage the second tunnel of triode Q4 connects power supply by resistance R 11; the grounded emitter of triode Q5; the base stage first via of triode Q5 connects power supply by resistance R 15; first end of base stage the second road connecting resistance R12 of triode Q5; second end of resistance R 12 is the dim signal input of described light-adjusting module; the base stage Third Road of triode Q5 connects the short-circuit protection module; the base stage the four tunnel of triode Q5 connects first end of capacitor C 7, the second end ground connection of capacitor C 7.
In the said structure; described short-circuit protection module comprises triode Q6, resistance R 19 and voltage-stabiliser tube D3; the collector and emitter of described triode Q6 connects first end and second end of described capacitor C 7 respectively; the base stage of described triode Q6 connects the anode of described voltage-stabiliser tube D3 by resistance R 19, and the negative electrode of described voltage-stabiliser tube D3 connects the negative electrode of LED and the negative electrode of voltage-stabiliser tube D2 simultaneously.
Another purpose of the present utility model is to provide a kind of LED lighting circuit, and described LED lighting circuit comprises LED, and described LED lighting circuit also comprises above-mentioned constant-current circuit.
In the utility model, this constant-current circuit is made of constant current control module and constant flow module, and the stability of this constant-current circuit output current and precision height have also improved delivery efficiency simultaneously.
Description of drawings
Fig. 1 is the structure chart of the constant-current circuit of the LED lighting circuit that provides of the utility model embodiment;
Fig. 2 is the exemplary circuit figure of the constant-current circuit of the LED lighting circuit that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Fig. 1 shows the structure of the constant-current circuit of the LED lighting circuit that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant with the utility model.
The LED lighting circuit comprises LED, and it also comprises constant-current circuit, and constant-current circuit comprises constant current control module 100 and constant flow module 200.
Constant current control module 100 is connected with LED, output constant current control signal; Constant flow module 200 is connected with constant current control module 100, dc voltage input end and LED respectively, and it is according to the constant current control signal of constant current control module 100 outputs, to LED output constant current.
As the utility model one embodiment, constant-current circuit also comprises the light-adjusting module 300 that is connected with constant current control module 100.
As the utility model one embodiment, constant-current circuit also comprises respectively the short-circuit protection module 400 that is connected with LED with light-adjusting module 300, constant current control module 100.
Fig. 2 shows the exemplary circuit structure of the constant-current circuit of the LED lighting circuit that the utility model embodiment provides.
As the utility model one embodiment; constant current control module 100 comprises constant current control chip U1; resistance R 1; resistance R 2; resistance R 3; resistance R 4; resistance R 6; resistance R 8; resistance R 9; resistance R 10; resistance R 13; resistance R 14; resistance R 16; resistance R 17; resistance R 18; capacitor C 1; capacitor C 2; capacitor C 3; capacitor C 4; capacitor C 5; capacitor C 6; voltage-stabiliser tube D2; field effect transistor Q2 and triode Q3; wherein; constant current control chip U1 adopts the L6562D control chip; first end of the error amplifier inverting input INV connecting resistance R1 of constant current control chip U1; the second termination power VCC of resistance R 1; the error amplifier output EA_out of constant current control chip U1 connects first end of capacitor C 2; first end of second end, one road connecting resistance R1 of capacitor C 2; another road of second end of capacitor C 2 is by resistance R 2 ground connection; the multiplier input MULT first via of constant current control chip U1 is by capacitor C 3 ground connection; the multiplier input MULT the second tunnel of constant current control chip U1 meets power supply VCC by resistance R 3; the multiplier input MULT Third Road of constant current control chip U1 connects the drain electrode of field effect transistor Q2; first end of the current sampling end CS connecting resistance R6 of constant current control chip U1; first end of the second terminating resistor R9 of resistance R 6; second end of resistance R 9 is by parallel resistor R14 and capacitor C 6 ground connection; the base stage of the second termination triode Q3 of resistance R 9; the collector electrode of triode Q3 is leaded up to resistance R 13 ground connection; another road of the collector electrode of triode Q3 connects the drain electrode of field effect transistor Q2; the emitter of triode Q3 is by resistance R 18 ground connection; the source electrode of field effect transistor Q2 is by resistance R 16 ground connection; the grid first via of field effect transistor Q2 is by resistance R 17 ground connection; the grid the second tunnel of field effect transistor Q2 is by capacitor C 5 ground connection; the grid Third Road of field effect transistor Q2 is by the resistance R 10 and the voltage-stabiliser tube D2 negative electrode and the short-circuit protection module 400 that meet LED of serial connection; the zero current sense terminal IDET first via of constant current control chip U1 connects light-adjusting module 300; the zero current sense terminal IDET the second tunnel of constant current control chip U1 connects constant flow module 200 by the resistance R 8 and the capacitor C 4 of serial connection; the earth terminal GND ground connection of constant current control chip U1; the output OUT of constant current control chip U1 connects constant flow module 200 by resistance R 4, and the power end VCC of constant current control chip U1 meets power supply VCC.
Constant flow module 200 comprises field effect transistor Q1, resistance R 5, resistance R 7, diode D1 and inductance L 1, the grid connecting resistance R4 of field effect transistor Q1, the grid of field effect transistor Q1 connects the source electrode of field effect transistor Q1 by resistance R 5, the source electrode of field effect transistor Q1 is leaded up to resistance R 7 ground connection, second end of another road of the source electrode of field effect transistor Q1 connecting resistance R6, the drain electrode first via of field effect transistor Q1 connects the anode of dc voltage input end Vin and LED by diode D1, the drain electrode the second tunnel of field effect transistor Q1 connects the negative electrode of LED by inductance L 1, and the drain electrode Third Road of field effect transistor Q1 meets inductance C4.
Light-adjusting module 300 comprises triode Q4; triode Q5; resistance R 11; resistance R 12; resistance R 15 and capacitor C 7; the collector electrode of triode Q4 meets the zero current sense terminal IDET of constant current control chip U1; the grounded emitter of triode Q4; the base stage first via of triode Q4 connects the collector electrode of triode Q5; the base stage the second tunnel of triode Q4 meets power supply VCC by resistance R 11; the grounded emitter of triode Q5; the base stage first via of triode Q5 meets power supply VCC by resistance R 15; first end of base stage the second road connecting resistance R12 of triode Q5; second end of resistance R 12 is the dim signal input of light-adjusting module 300; the base stage Third Road of triode Q5 connects short-circuit protection module 400; the base stage the four tunnel of triode Q5 connects first end of capacitor C 7, the second end ground connection of capacitor C 7.
Short-circuit protection module 400 comprises triode Q6, resistance R 19 and voltage-stabiliser tube D3; the collector and emitter of triode Q6 connects first end and second end of capacitor C 7 respectively; the base stage of triode Q6 connects the anode of voltage-stabiliser tube D3 by resistance R 19, and the negative electrode of voltage-stabiliser tube D3 connects the negative electrode of LED and the negative electrode of voltage-stabiliser tube D2 simultaneously.
The operation principle of this constant-current circuit is:
1, the principle during the power supply operate as normal: when power supply VCC operate as normal, constant current control chip U1 starts work, the output OUT output control signal of constant current control chip U1 drives field effect transistor Q1 by resistance R 4, on resistance R 7, produce pressure drop during field effect transistor Q1 conducting, current signal is provided for the current sampling end CS of constant current control chip U1.Resistance R 14; resistance R 9; triode Q3 forms current foldback circuit, and resistance R 3, resistance R 13 are formed bleeder circuit and voltage signal be provided for the multiplier input MULT of constant current control chip U1; field effect transistor Q2; resistance R 16, resistance R 17, capacitor C 5; resistance R 10; voltage-stabiliser tube D2 forms current precision compensating circuit, triode Q6, resistance R 19; voltage-stabiliser tube D3 forms output short circuit protection module 400; triode Q4, resistance R 11, resistance R 15; triode Q5; capacitor C 7, resistance R 12 is formed light-adjusting module 300, resistance R 1; resistance R 2 is formed bleeder circuit and voltage signal is provided for the error amplifier inverting input INV of constant current control chip U1; when the error amplifier inverting input INV of constant current control chip U1 and multiplier input MULT voltage signal immobilize, when current sampling end CS input signal is high level by with chip internal comparison operation, the output OUT output PWM of constant current control chip U1; duty ratio diminishes the voltage drop of resistance R 7 generations is diminished, and constant current value is constant.When current sampling end CS input signal is low level, by with the chip internal comparison operation, output OUT output duty cycle becomes the voltage drop that ambassador's resistance R 7 produces and becomes big, constant current value is constant.Simultaneously, PWMA signal of dim signal input input of light-adjusting module 300 is given triode Q5, because the level of PWMA signal is the variation that does not stop from high to low, when the PWMA signal is high level, triode Q5 conducting, field effect transistor Q1 conducting is when the PWMA signal is low level, triode Q5 ends, and field effect transistor Q1 ends.
The realization of 2, constant current function: when the error amplifier inverting input INV of constant current control chip U1 and multiplier input MULT voltage signal immobilize, when current sampling end CS input signal is high level by with the chip internal comparison operation, the output OUT output duty cycle of constant current control chip U1 diminishes the voltage drop of resistance R 7 generations is diminished, and constant current value is constant.When current sampling end CS input signal is low level by with the chip internal comparison operation, the output OUT output duty cycle of constant current control chip U1 becomes the voltage drop that ambassador's resistance R 7 produces and becomes big, constant current value is constant.When the error amplifier inverting input INV of constant current control chip U1 voltage signal immobilizes, when resistance R 7 voltage signals attempt to become big, attempt to become big by inductance L 1 both end voltage, at this moment voltage-stabiliser tube D2 work makes the multiplier input MULT voltage signal step-down of constant current control chip U1, multiplier input MULT and current sampling end CS voltage signal are through the chip internal comparison operation, the output OUT output duty cycle of constant current control chip U1 diminishes the voltage drop of resistance R 7 generations is diminished, and constant current value is constant.
3, the realization of current-limiting function: when output current increases or during overcurrent, triode Q3 base potential is enhanced, triode Q3 conducting, very fast being dragged down of multiplier input MULT point current potential of constant current control chip U1, electric current moment is zero.When constant current control chip U1 recovery operate as normal, the output pulse width signal is given field effect transistor Q1, but the overcurrent of output does not also have disappearance at this moment, and triode Q3 base potential is enhanced again immediately, causes triode Q3 conducting once more.When having served as current vanishes, triode Q3 ends, and constant current control chip U1 recovers operate as normal, and the output pulse width signal is given triode Q3, power up operate as normal.Thereby guaranteed that circuit can also operate as normal when overcurrent.
4, short-circuit protection function: when the output short circuit; voltage-stabiliser tube D3 work makes triode Q6 conducting; triode Q5 base potential is dragged down; triode Q5 quits work; triode Q4 base potential is enhanced, triode Q4 conducting, and the zero current sense terminal IDET current potential of constant current control chip U1 is dragged down; zero current sense terminal IDET output low level, field effect transistor Q1 quits work.
5, the realization of dimming function: when PWMA signal of dim signal input input of light-adjusting module 300 is high level, triode Q5 conducting, the output OUT of constant current control chip U1 is a high level, field effect transistor Q1 conducting; When the PWMA signal was low level, triode Q5 ended, and the output OUT current potential of constant current control chip U1 is a low level, and field effect transistor Q1 ends.
In the utility model embodiment, this constant-current circuit is made of constant current control module and constant flow module, and the stability of this constant-current circuit output current and precision height have also improved delivery efficiency simultaneously.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (8)
1. a constant-current circuit is characterized in that, described constant-current circuit comprises:
Be connected the constant current control module of output constant current control signal with LED;
The constant flow module that is connected with LED with described constant current control module, dc voltage input end respectively is according to the constant current control signal of described constant current control module output, to described LED output constant current.
2. constant-current circuit as claimed in claim 1 is characterized in that, described constant-current circuit also comprises the light-adjusting module that is connected with described constant current control module.
3. constant-current circuit as claimed in claim 2 is characterized in that, described constant-current circuit also comprises respectively the short-circuit protection module that is connected with LED with described light-adjusting module, constant current control module.
4. constant-current circuit as claimed in claim 3; it is characterized in that; described constant current control module comprises constant current control chip U1; resistance R 1; resistance R 2; resistance R 3; resistance R 4; resistance R 6; resistance R 8; resistance R 9; resistance R 10; resistance R 13; resistance R 14; resistance R 16; resistance R 17; resistance R 18; capacitor C 1; capacitor C 2; capacitor C 3; capacitor C 4; capacitor C 5; capacitor C 6; voltage-stabiliser tube D2; field effect transistor Q2 and triode Q3; first end of the error amplifier inverting input connecting resistance R1 of constant current control chip U1; second termination power of resistance R 1; first end of the error amplifier output termination capacitor C 2 of constant current control chip U1; first end of second end, one road connecting resistance R1 of capacitor C 2; another road of second end of capacitor C 2 is by resistance R 2 ground connection; the multiplier input first via of constant current control chip U1 is by capacitor C 3 ground connection; the multiplier input the second tunnel of constant current control chip U1 connects power supply by resistance R 3; the multiplier input Third Road of constant current control chip U1 connects the drain electrode of field effect transistor Q2; first end of the current sampling terminating resistor R6 of constant current control chip U1; first end of the second terminating resistor R9 of resistance R 6; second end of resistance R 9 is by parallel resistor R14 and capacitor C 6 ground connection; the base stage of the second termination triode Q3 of resistance R 9; the collector electrode of triode Q3 is leaded up to resistance R 13 ground connection; another road of the collector electrode of triode Q3 connects the drain electrode of field effect transistor Q2; the emitter of triode Q3 is by resistance R 18 ground connection; the source electrode of field effect transistor Q2 is by resistance R 16 ground connection; the grid first via of field effect transistor Q2 is by resistance R 17 ground connection; the grid the second tunnel of field effect transistor Q2 is by capacitor C 5 ground connection; the grid Third Road of field effect transistor Q2 is by the resistance R 10 and the voltage-stabiliser tube D2 negative electrode and the short-circuit protection module that meet described LED of serial connection; the zero current sense terminal first via of described constant current control chip U1 connects described light-adjusting module; the zero current sense terminal the second tunnel of described constant current control chip U1 connects described constant flow module by the resistance R 8 and the capacitor C 4 of serial connection; the earth terminal ground connection of described constant current control chip U1; the output of described constant current control chip U1 connects described constant flow module by resistance R 4, the power supply termination power of described constant current control chip U1.
5. constant-current circuit as claimed in claim 4, it is characterized in that, described constant flow module comprises field effect transistor Q1, resistance R 5, resistance R 7, diode D1 and inductance L 1, the grid of described field effect transistor Q1 connects described resistance R 4, the grid of described field effect transistor Q1 connects the source electrode of field effect transistor Q1 by described resistance R 5, the source electrode of described field effect transistor Q1 is leaded up to described resistance R 7 ground connection, another road of the source electrode of described field effect transistor Q1 connects second end of described resistance R 6, the drain electrode first via of described field effect transistor Q1 connects the anode of dc voltage input end and LED by described diode D1, the drain electrode the second tunnel of field effect transistor Q1 connects the negative electrode of LED by inductance L 1, and the drain electrode Third Road of field effect transistor Q1 meets inductance C4.
6. constant-current circuit as claimed in claim 5; it is characterized in that; described light-adjusting module comprises triode Q4; triode Q5; resistance R 11; resistance R 12; resistance R 15 and capacitor C 7; the collector electrode of triode Q4 connects the zero current sense terminal of described constant current control chip U1; the grounded emitter of triode Q4; the base stage first via of triode Q4 connects the collector electrode of triode Q5; the base stage the second tunnel of triode Q4 connects power supply by resistance R 11; the grounded emitter of triode Q5; the base stage first via of triode Q5 connects power supply by resistance R 15; first end of base stage the second road connecting resistance R12 of triode Q5; second end of resistance R 12 is the dim signal input of described light-adjusting module; the base stage Third Road of triode Q5 connects the short-circuit protection module, and the base stage the four tunnel of triode Q5 connects first end of capacitor C 7, the second end ground connection of capacitor C 7.
7. constant-current circuit as claimed in claim 6; it is characterized in that; described short-circuit protection module comprises triode Q6, resistance R 19 and voltage-stabiliser tube D3; the collector and emitter of described triode Q6 connects first end and second end of described capacitor C 7 respectively; the base stage of described triode Q6 connects the anode of described voltage-stabiliser tube D3 by resistance R 19, and the negative electrode of described voltage-stabiliser tube D3 connects the negative electrode of LED and the negative electrode of voltage-stabiliser tube D2 simultaneously.
8. LED lighting circuit, described LED lighting circuit comprises LED, it is characterized in that, described LED lighting circuit also comprises each described constant-current circuit as claim 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202049854U CN201518550U (en) | 2009-09-23 | 2009-09-23 | LED light circuit and constant current circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202049854U CN201518550U (en) | 2009-09-23 | 2009-09-23 | LED light circuit and constant current circuit thereof |
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| CN201518550U true CN201518550U (en) | 2010-06-30 |
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| CN2009202049854U Expired - Fee Related CN201518550U (en) | 2009-09-23 | 2009-09-23 | LED light circuit and constant current circuit thereof |
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Cited By (7)
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| CN102026451A (en) * | 2010-11-26 | 2011-04-20 | 深圳市聚作实业有限公司 | Dimmable light-emitting diode (LED) driving power supply |
| CN102592548A (en) * | 2012-02-28 | 2012-07-18 | 青岛海信电器股份有限公司 | Multi-path lamp strip driving method of liquid crystal display, apparatus thereof and liquid crystal television |
| CN102651941A (en) * | 2011-02-25 | 2012-08-29 | 海洋王照明科技股份有限公司 | Protective circuit of fluorescent lamp ballast and circuit of fluorescent lamp ballast |
| CN102833917A (en) * | 2012-08-29 | 2012-12-19 | 深圳创维－Rgb电子有限公司 | LED constant-current control circuit and LED liquid crystal television |
| CN103076532A (en) * | 2012-12-28 | 2013-05-01 | 上海澳星照明电器制造有限公司 | Failure detection circuit and detection method for light emitting diode (LED) |
| CN103269541A (en) * | 2013-05-08 | 2013-08-28 | 珠海雷特电子科技有限公司 | LED constant-current controller integrating three types of output current specifications |
| CN104994658A (en) * | 2015-07-20 | 2015-10-21 | 苏州新里程电控系统有限公司 | An elevator LED lamp panel constant current control circuit |
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2009
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102026451A (en) * | 2010-11-26 | 2011-04-20 | 深圳市聚作实业有限公司 | Dimmable light-emitting diode (LED) driving power supply |
| CN102026451B (en) * | 2010-11-26 | 2014-02-19 | 深圳市聚作照明股份有限公司 | Dimmable light-emitting diode (LED) driving power supply |
| CN102651941A (en) * | 2011-02-25 | 2012-08-29 | 海洋王照明科技股份有限公司 | Protective circuit of fluorescent lamp ballast and circuit of fluorescent lamp ballast |
| CN102651941B (en) * | 2011-02-25 | 2014-05-07 | 海洋王照明科技股份有限公司 | Protective circuit of fluorescent lamp ballast and circuit of fluorescent lamp ballast |
| CN102592548A (en) * | 2012-02-28 | 2012-07-18 | 青岛海信电器股份有限公司 | Multi-path lamp strip driving method of liquid crystal display, apparatus thereof and liquid crystal television |
| CN102833917A (en) * | 2012-08-29 | 2012-12-19 | 深圳创维－Rgb电子有限公司 | LED constant-current control circuit and LED liquid crystal television |
| CN102833917B (en) * | 2012-08-29 | 2015-04-29 | 深圳创维－Rgb电子有限公司 | LED constant-current control circuit and LED liquid crystal television |
| CN103076532A (en) * | 2012-12-28 | 2013-05-01 | 上海澳星照明电器制造有限公司 | Failure detection circuit and detection method for light emitting diode (LED) |
| CN103076532B (en) * | 2012-12-28 | 2016-12-07 | 上海澳星照明电器制造有限公司 | A kind of LED failure testing circuit and detection method |
| CN103269541A (en) * | 2013-05-08 | 2013-08-28 | 珠海雷特电子科技有限公司 | LED constant-current controller integrating three types of output current specifications |
| CN103269541B (en) * | 2013-05-08 | 2015-10-28 | 珠海雷特电子科技有限公司 | A kind of LED constant current controller of integrated three kinds of output current specifications |
| CN104994658A (en) * | 2015-07-20 | 2015-10-21 | 苏州新里程电控系统有限公司 | An elevator LED lamp panel constant current control circuit |
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