CN102469655B - Light-emitting diode (LED) driving circuit - Google Patents
Light-emitting diode (LED) driving circuit Download PDFInfo
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- CN102469655B CN102469655B CN201010542415.3A CN201010542415A CN102469655B CN 102469655 B CN102469655 B CN 102469655B CN 201010542415 A CN201010542415 A CN 201010542415A CN 102469655 B CN102469655 B CN 102469655B
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Abstract
The invention relates to a light-emitting diode (LED) driving circuit. According to the LED driving circuit, current passes through a power supply positive electrode, an energy storage inductor, an LED anode, an LED cathode, a triode collector, a triode emitter, a sampling resistor, a metal oxide semiconductor (MOS) tube drain, an MOS tube source and a power supply negative electrode sequentially; the power supply positive electrode is connected to an MOS tube grid by a self-locking switch and a voltage division circuit; a pin 1 of a constant-current control chip is a power supply input pin and is connected with the power supply positive electrode; a pin 2 is a ground (GND) pin; a pin 3 is an effective operating enabling pin with a high level, is connected with the power supply positive electrode by a resistor R1 and is connected with the pin 2 by a resistor R2; a pin 4 is a current detection pin; a pin 5 is a voltage detection feedback pin, the pin 4 and the pin 5 are connected and are connected with the triode emitter and connecting end of the sampling resistor, and the other end of the sampling resistor is connected with the pin 2; and a pin 6 is a pulse-width modulation (PWM) driving pin and is connected with a triode base. The LED driving circuit also comprises a filter capacitor which is connected in parallel with an LED.
Description
[technical field]
The present invention relates to a kind of LED drive circuit, relate in particular to a kind of LED constant-current drive circuit.
[background technology]
Along with scientific and technical development, New Products & New Technology is constantly reformed, and LED is as new type light source, it has energy-saving and environmental protection, efficient feature, technology is ripe and be applied to every field, and LED is widely used as light source, has also occurred various LED drive circuits thereupon.
At present in the place of low-voltage, be all to adopt DC-DC wave chopping technology to carry out driving LED, it has the advantages such as power consumption is little, efficiency is high, reliable and stable, unit power volume is little, lightweight, but its cost is high, circuit is complicated, fragile, have the stronger shortcomings such as High-frequency Interference, to user, brought inconvenience.
Therefore, prior art needs to improve.
[summary of the invention]
In view of this, be necessary to propose a kind of efficient, reliable, cheap, simple, light LED drive circuit, the constant current of driving LED work can be safe and reliablely provided.
A technical scheme of the present invention is, a kind of LED drive circuit, and it comprises power supply, energy storage inductor L1, triode Q1, metal-oxide-semiconductor Q2, self-lock switch S1, resistance R 1, resistance R 2, sampling resistor R3, bleeder circuit and constant current control chip U1; The anode of positive source, energy storage inductor L1, driven LED, the negative electrode of driven LED, triode Q1 collector electrode, triode Q1 emitter, sampling resistor R3, metal-oxide-semiconductor Q2 drain electrode, metal-oxide-semiconductor Q2 source electrode are connected successively with power cathode; Positive source is also connected to metal-oxide-semiconductor Q2 grid by self-lock switch S1 and bleeder circuit successively; The 1 pin VCC of constant current control chip U1 is power supply input pin, is connected with the positive pole of power supply; 2 pin are GND pin; 3 pin STDN are that high level is effectively worked and enabled pin, by resistance R 1, are connected with positive source, by resistance R 2, are connected with its 2 pin GND; 4 pin Isense are current detecting pin; 5 pin Vfb are for detecting Voltage Feedback pin, and 4 pin Isense are connected with the link of sampling resistor R3 with the emitter of triode Q1 after being connected with 5 pin Vfb again, and the other end of sampling resistor R3 is connected with 2 pin GND; 6 pin DRIVE are that PWM drives pin, are connected with the base stage of triode Q1; Described LED drive circuit also comprises the filter capacitor C2 in parallel with described LED.
Be applied to such scheme, in described LED drive circuit, bleeder circuit comprises divider resistance R4, divider resistance R5; Positive source is also connected to metal-oxide-semiconductor Q2 grid by self-lock switch S1, divider resistance R4 successively; Metal-oxide-semiconductor Q2 source electrode is also connected with metal-oxide-semiconductor Q2 grid by divider resistance R5.
Be applied to above-mentioned each scheme, described LED drive circuit also comprises a sustained diode 1, in parallel with sustained diode 1 after energy storage inductor L1 connects with filter capacitor C2, wherein, sustained diode 1 negative electrode is connected with energy storage inductor L1, and anode is connected with filter capacitor C2.
Be applied to above-mentioned each scheme, described LED drive circuit also comprises a high frequency capacitance C1, and it is connected with 2 pin GND with positive source respectively.
Be applied to above-mentioned each scheme, in described LED drive circuit, described power supply is DC power supply.
Be applied to above-mentioned each scheme, in described LED drive circuit, the two joint 3.7V lithium batteries that described power supply is series connection.
Be applied to above-mentioned each scheme, in described LED drive circuit, resistance R 1 and the identical setting of resistance R 2 resistance.
Be applied to such scheme, in described LED drive circuit, resistance R 1 and the identical setting of divider resistance R5 resistance.
Be applied to such scheme, in described LED drive circuit, divider resistance R5 resistance is 10 times of settings of divider resistance R4 resistance.
Be applied to such scheme, in described LED drive circuit, divider resistance R4 resistance is 1k Ω.
Be applied to above-mentioned each scheme, in described LED drive circuit, also comprise a capacitor C 3, in parallel with capacitor C 3 after energy storage inductor L1 connects with filter capacitor C2.
Such scheme, adopts integrated integrated high-frequency model design, has the advantages such as efficient, reliable, cheap, simple, light, has planned as a whole the advantage of Switching Power Supply, has overcome the shortcoming of Switching Power Supply; And, by adopting constant current control chip to drive, control, guaranteed the reliable and stable constant current state that is operated in of LED, reduced cost simultaneously, economic benefit is high.
[accompanying drawing explanation]
Fig. 1 is a LED drive circuit schematic diagram in embodiment;
Fig. 2 is the LED drive circuit schematic diagram in another embodiment.
[embodiment]
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
One embodiment of the present of invention are, a LED drive circuit, it comprises power supply, energy storage inductor L1, triode Q1, sampling resistor R3, metal-oxide-semiconductor Q2, self-lock switch S1, resistance R 1, resistance R 2, divider resistance R4, divider resistance R5 and constant current control chip U1.Or this drive circuit can also comprise one or more LED.
From positive source, connect successively positive source, energy storage inductor L1, LED anode, LED negative electrode, triode Q1 collector electrode, triode Q1 emitter, sampling resistor R3, metal-oxide-semiconductor Q2 drain electrode, metal-oxide-semiconductor Q2 source electrode and power cathode.For example, R3 is 0.043R, i.e. 0.043 Ω.
And positive source is also connected to metal-oxide-semiconductor Q2 grid by the bleeder circuit of self-lock switch S1 and divider resistance R4 and R5 formation successively, with thinking that metal-oxide-semiconductor Q2 turn-on and turn-off provide control signal.For example, resistance R 4 can be 1k Ω, 2k Ω etc.; For example, metal-oxide-semiconductor Q2 can adopt IRF7413 etc.And metal-oxide-semiconductor Q2 source electrode is also connected with metal-oxide-semiconductor Q2 grid by resistance R 5; For example, resistance R 5 can be 10k Ω, 15k Ω, 20k Ω etc.
The 1 pin VCC of constant current control chip U1 is power supply input pin, is connected with the positive pole of power supply; 2 pin are GND pin, and it can ground connection, also can be earth-free; 3 pin STDN are that high level is effectively worked and enabled pin, and it is connected with positive source by resistance R 1, by resistance R 2, is connected with its 2 pin GND; 4 pin Isense are current detecting pin; 5 pin Vfb are for detecting Voltage Feedback pin, and 4 pin Isense are connected with the link of sampling resistor R3 with the emitter of triode Q1 after being connected with 5 pin Vfb again, and the other end of sampling resistor R3 is connected with 2 pin GND; 6 pin DRIVE are that PWM drives pin, are connected with the base stage of triode Q1.For example, constant current control chip U1 can be ZXSC400.
Described LED drive circuit also comprises the filter capacitor C2 in parallel with described LED.For example, filter capacitor C2 is 3.3 μ F/25V or 3.5 μ F/25V etc.
Combine with upper example, described LED drive circuit also comprises a sustained diode 1, and in parallel with sustained diode 1 after energy storage inductor L1 connects with filter capacitor C2, wherein, sustained diode 1 negative electrode is connected with energy storage inductor L1, and anode is connected with filter capacitor C2.
Combine with above-mentioned each example, described LED drive circuit also comprises a high frequency capacitance C1, and it is connected with 2 pin GND with positive source respectively.
Combine with above-mentioned each example, in described LED drive circuit, described power supply is DC power supply, for example, and the two joint 3.7V lithium batteries that described power supply is series connection.And for example, the four joint 3.7V lithium batteries that described power supply is series connection.And for example, described power supply is No. five, a joint or No. seven batteries.And for example, two No. five, the joints that described power supply is series connection or No. seven batteries etc.
Combine with above-mentioned each example, in described LED drive circuit, resistance R 1 and the identical setting of resistance R 2 resistance.For example, resistance R 1 is identical or identical with resistance R 2 resistances.Preferably, resistance R 1, resistance R 2 and the identical setting of resistance R 5 resistance.Preferably, resistance R 5 resistances are 10 times of settings of resistance R 4 resistance.For example, resistance R 4 resistances are 1k Ω, and resistance R 1, resistance R 2 are 10k Ω with resistance R 5 resistances.And for example, resistance R 4 resistances are 0.8k Ω, and resistance R 1, resistance R 2 are 8k Ω with resistance R 5 resistances.And for example, resistance R 4 resistances are 1.2k Ω, and resistance R 1, resistance R 2 are 12k Ω with resistance R 5 resistances.
Combine with above-mentioned each example, described LED drive circuit comprises a capacitor C 3, in parallel with capacitor C 3 after energy storage inductor L1 connects with filter capacitor C2.Be that energy storage inductor L1, filter capacitor C2 and capacitor C 3 form a π type filter circuit.
Provide a detailed example below, as shown in Figure 2, the present embodiment provides a kind of LED drive circuit of constant current again, and described control circuit is to adopt two joint 3.7V lithium battery series connection as working power.Stable in order to guarantee power supply, so place filter capacitor C1 at input side.Power supply detects resistance (being sampling resistor) R3 and metal-oxide-semiconductor Q2 by energy storage inductor L1, triode Q1, constant current and provides work loop for LED light source.Constant current control chip U1 is according to the sampled voltage signal output continually varying pulse signal of sampling resistor R3, pulse signal is directly connected with the base stage of triode Q1, thereby by controlling opening, turn-off and adjusting the operating current that flows through LED of triode Q1, guarantee that LED is operated in constant current state, and guarantee the reliable and stable work of LED light source.
In this example, in order to guarantee the stable of input power, between the positive pole of power supply and GND, increased high frequency capacitance C1.
1 pin of constant current control chip U1 is power supply input pin, is directly connected with the positive pole of power supply; 2 pin are GND pin; 3 pin are that work enables pin, and high level is effective, and 3 pin are connected with positive source by resistance R 1, by resistance R 2, are connected with its 2 pin GND; 4 pin are current detecting pin; 5 pin are for detecting Voltage Feedback pin, and 4 pin are connected with the link of sampling resistor R3 with the emitter of triode Q1 after being connected with 5 pin again, and the other end of sampling resistor R3 is connected with GND; 6 pin are that PWM drives pin, are directly connected with the base stage of triode Q1.
Energy storage inductor L1 one end is connected with sustained diode 1 negative electrode, and the other end is connected with LED anode, filter capacitor C2; The filter capacitor C2 other end and LED negative electrode, triode Q1 collector electrode, sustained diode 1 anodic bonding; Metal-oxide-semiconductor Q2 drain electrode is connected with GND, and source electrode is connected with power cathode, resistance R 5, and grid is connected with resistance R 4, R5; Self-lock switch S1 one end is connected with positive source, and the other end is connected with resistance R 4.
When self-lock switch S1 is closed, by divider resistance R4 and R5, to metal-oxide-semiconductor Q2 grid, provide operating voltage, metal-oxide-semiconductor Q2 is open-minded, constant current control chip U1 work, and drive triode Q1 open-minded, supply voltage forms path by energy storage inductor L1, triode Q1, sampling resistor R3, metal-oxide-semiconductor Q2, LED lamp D2, and LED starts constant current work.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention; And, each technical characterictic listed above, it mutually combines and can form each embodiment, should be regarded as belonging to the scope that specification of the present invention is recorded.For the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (9)
1. a LED drive circuit, is characterized in that, comprises power supply, energy storage inductor L1, triode Q1, metal-oxide-semiconductor Q2, self-lock switch S1, resistance R 1, resistance R 2, sampling resistor R3, bleeder circuit and constant current control chip U1;
The anode of positive source, energy storage inductor L1, driven LED, the negative electrode of driven LED, triode Q1 collector electrode, triode Q1 emitter, sampling resistor R3, metal-oxide-semiconductor Q2 drain electrode, metal-oxide-semiconductor Q2 source electrode are connected successively with power cathode;
Positive source is also connected to metal-oxide-semiconductor Q2 grid by self-lock switch S1 and bleeder circuit successively;
The 1 pin VCC of constant current control chip U1 is power supply input pin, is connected with the positive pole of power supply; 2 pin are GND pin; 3 pin STDN are that high level is effectively worked and enabled pin, by resistance R 1, are connected with positive source, by resistance R 2, are connected with its 2 pin GND; 4 pin Isense are current detecting pin; 5 pin Vfb are for detecting Voltage Feedback pin, and 4 pin Isense are connected with the link of sampling resistor R3 with the emitter of triode Q1 after being connected with 5 pin Vfb again, and the other end of sampling resistor R3 is connected with 2 pin GND; 6 pin DRIVE are that PWM drives pin, are connected with the base stage of triode Q1;
Described LED drive circuit also comprises the filter capacitor C2 in parallel with described LED;
Bleeder circuit comprises divider resistance R4, divider resistance R5; Positive source is also connected to metal-oxide-semiconductor Q2 grid by self-lock switch S1, divider resistance R4 successively; Metal-oxide-semiconductor Q2 source electrode is also connected with metal-oxide-semiconductor Q2 grid by divider resistance R5.
2. LED drive circuit according to claim 1, is characterized in that, also comprises a sustained diode 1, it is in parallel with sustained diode 1 after energy storage inductor L1 connects with filter capacitor C2, wherein, sustained diode 1 negative electrode is connected with energy storage inductor L1, and anode is connected with filter capacitor C2.
3. LED drive circuit according to claim 2, is characterized in that, also comprises a high frequency capacitance C1, and it is connected with 2 pin GND with positive source respectively.
4. LED drive circuit according to claim 3, is characterized in that, described power supply is DC power supply.
5. LED drive circuit according to claim 4, is characterized in that, the two joint 3.7V lithium batteries that described power supply is series connection.
6. LED drive circuit according to claim 5, is characterized in that, resistance R 1 and the identical setting of resistance R 2 resistance.
7. LED drive circuit according to claim 6, is characterized in that, resistance R 1 and the identical setting of divider resistance R5 resistance.
8. LED drive circuit according to claim 7, is characterized in that, divider resistance R5 resistance is 10 times of settings of divider resistance R4 resistance, and divider resistance R4 resistance is 1k Ω.
9. LED drive circuit according to claim 8, is characterized in that, also comprises a capacitor C 3, in parallel with capacitor C 3 after energy storage inductor L1 connects with filter capacitor C2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010542415.3A CN102469655B (en) | 2010-11-11 | 2010-11-11 | Light-emitting diode (LED) driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010542415.3A CN102469655B (en) | 2010-11-11 | 2010-11-11 | Light-emitting diode (LED) driving circuit |
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| Publication Number | Publication Date |
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| CN102469655A CN102469655A (en) | 2012-05-23 |
| CN102469655B true CN102469655B (en) | 2014-10-01 |
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| CN201010542415.3A Expired - Fee Related CN102469655B (en) | 2010-11-11 | 2010-11-11 | Light-emitting diode (LED) driving circuit |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103079311A (en) * | 2012-12-27 | 2013-05-01 | 木林森股份有限公司 | Double loop controlled LED (Light Emitting Diode) driving circuit |
| CN103096601B (en) * | 2013-01-25 | 2015-03-18 | 海林火地电气科技有限公司 | Light emitting diode (LED) power self-adaptive driver |
| CN104684128B (en) * | 2013-12-03 | 2018-11-06 | 深圳市海洋王照明工程有限公司 | A kind of LED drive circuit and lighting device |
| CN103929852A (en) * | 2014-03-31 | 2014-07-16 | 深圳市九洲光电科技有限公司 | LED lamp with light and color capable of being adjusted |
| CN104582208B (en) * | 2015-02-15 | 2017-03-22 | 北京经纬恒润科技有限公司 | Illuminating circuit and illuminating circuit control method |
| CN106332410A (en) * | 2016-08-16 | 2017-01-11 | 深圳天珑无线科技有限公司 | Flash lamp driving circuit |
| CN107222240A (en) * | 2017-06-01 | 2017-09-29 | 深圳源创智能照明有限公司 | A kind of simple protocol carriers control circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2525357Y (en) * | 2002-03-02 | 2002-12-11 | 李毅 | Integrated solar energy court yard lamp |
| CN1725927A (en) * | 2005-07-15 | 2006-01-25 | 赖益嵩 | LED chip drive circuit |
-
2010
- 2010-11-11 CN CN201010542415.3A patent/CN102469655B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2525357Y (en) * | 2002-03-02 | 2002-12-11 | 李毅 | Integrated solar energy court yard lamp |
| CN1725927A (en) * | 2005-07-15 | 2006-01-25 | 赖益嵩 | LED chip drive circuit |
Non-Patent Citations (1)
| Title |
|---|
| 毛兴武，张传敬.LED电源及其基本驱动电路（1）.《电子报》.2009, * |
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| CN102469655A (en) | 2012-05-23 |
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