CN103813567A - LED constant-current driving method - Google Patents
LED constant-current driving method Download PDFInfo
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- CN103813567A CN103813567A CN201210439310.4A CN201210439310A CN103813567A CN 103813567 A CN103813567 A CN 103813567A CN 201210439310 A CN201210439310 A CN 201210439310A CN 103813567 A CN103813567 A CN 103813567A
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Abstract
The invention provides an LED constant-current driving method. A first operational amplifier (A) and a second operational amplifier (B) form a closed-loop feedback circuit; the first operational amplifier (A) and a first capacitor (C1) form an integral circuit; and a first resistor (R1), a second resistor (R2), a third resistor (R3) and a second capacitor (C2) form a sampling circuit. Current flowing through the LED generates sampling voltage on the third resistor (R3); the sampling voltage is sent to the first operational amplifier (A) in the forward path to be compared with reference voltage (Vr), control voltage is generated to carry out regulation on gate source voltage of an MOS tube (Q), and thus constant current is realized. In the circuit, the formula of the constant current is that IO=R2*Vr/R3*(R1+R2), the Vr is the reference voltage, the R1 and the R2 are feedback resistors, the R3 is the sampling resistor, and a power supply (S) provides power for the whole circuit.
Description
technical field:
The present invention relates to a kind of method that LED constant current drives, belong to integrated circuit fields.
background technology:
Along with the development of semiconductor technology, white light LEDs is just progressing into normal lighting field, LED is a kind of semiconductor device that electric energy conversion can be become to luminous energy, it is to rely on the positive and negative charge in material compound next luminous, in reality, there is no directly to send the semi-conducting material of white light, the most frequently used in the implementation method of white light LEDs is exactly to utilize tri-kinds of LED of RGB to be mixed into white light, therefore, white light LEDs is applied in illumination, can be mixed with as required various different-colours, the LED lamp of colourity, to bring great free space to people, simultaneously, the driving voltage of LED reduces widely, energy saving nearly 90%, at present L E D being carried out to constant current driving is a very important problem, because can being similar to, LED thinks that forward current is directly proportional to the n power of forward voltage, LED operating voltage will cause the sharply variation of operating current compared with minor swing, controlling the improper PN junction that may make burns out, the brightness of LED, the characteristics such as life-span, all there is direct relation with electric current, so will carry out constant current driving to LED.
summary of the invention:
The present invention proposes a kind of method that LED constant current drives, this driving is to form a closed-loop feedback circuit by two amplifiers, through the comparison of sampled voltage and reference voltage, generation is controlled voltage the gate source voltage of metal-oxide-semiconductor is regulated, thereby can reach the effect of constant current.
For realizing above-mentioned object, the present invention adopts following technical scheme:
The method that LED constant current drives, comprises power supply (S), LED, amplifier 1 (A), amplifier 2 (B), resistance 1 (R1), resistance 2 (R2), resistance 3 (R3), electric capacity 1 (C1), electric capacity 2 (C2), metal-oxide-semiconductor (Q), reference voltage (Vr); As shown in Figure 1.
Below in conjunction with Fig. 1, the course of work of the present invention is described:
Amplifier 1 (A) and amplifier 2 (B) form a closed-loop feedback circuit, amplifier 1 (A) forms integrating circuit with electric capacity 1 (C1), resistance 1 (R1), resistance 2 (R2), resistance 3 (R3) forms sample circuit with electric capacity 2 (C2), electric current through LED above produces sampled voltage at resistance 3 (R3), this sampled voltage is delivered in forward path amplifier 1 (A) and is compared with reference voltage (Vr) through feedback amplifier 2 (B), producing control voltage regulates the gate source voltage of metal-oxide-semiconductor (Q), thereby realize constant current, in this circuit, constant electric current is: I
0=R2 × Vr/R3 (R1+R2), wherein Vr is reference voltage, resistance 1 (R1) and resistance 2 (R2) are feedback resistance, and resistance 3 (R3) is sampling resistor, and the power supply of integrated circuit is provided by power supply (S).
Beneficial effect of the present invention:
The present invention has rationally improved LED constant current and has driven, and makes LED more stable, has increased the useful life of LED.
accompanying drawing explanation:
Fig. 1 is constant-current circuit figure of the present invention.
embodiment:
In order to make technical method of the present invention clearer, below in conjunction with drawings and Examples, the present invention is described in more detail, and instantiation described herein only, in order to explain the present invention, is not limited to the present invention.
embodiment:
With reference to accompanying drawing 1, amplifier 1 (A) and amplifier 2 (B) form a closed-loop feedback circuit, amplifier 1 (A) forms integrating circuit with electric capacity 1 (C1), resistance 1 (R1), resistance 2 (R2), resistance 3 (R3) forms sample circuit with electric capacity 2 (C2), electric current through LED above produces sampled voltage at resistance 3 (R3), this sampled voltage is delivered in forward path amplifier 1 (A) and is compared with reference voltage (Vr) through feedback amplifier 2 (B), producing control voltage regulates the gate source voltage of metal-oxide-semiconductor (Q), thereby realize constant current, in this circuit, constant electric current is: I
0=R2 × Vr/R3 (R1+R2), wherein Vr is reference voltage, resistance 1 (R1) and resistance 2 (R2) are feedback resistance, and resistance 3 (R3) is sampling resistor, and the power supply of integrated circuit is provided by power supply (S).
Claims (1)
1. the method that LED constant current drives, comprises power supply (S), LED, amplifier 1 (A), amplifier 2 (B), resistance 1 (R1), resistance 2 (R2), resistance 3 (R3), electric capacity 1 (C1), electric capacity 2 (C2), metal-oxide-semiconductor (Q), reference voltage (Vr), it is characterized in that: amplifier 1 (A) and amplifier 2 (B) form a closed-loop feedback circuit, amplifier 1 (A) forms integrating circuit with electric capacity 1 (C1), resistance 1 (R1), resistance 2 (R2), resistance 3 (R3) forms sample circuit with electric capacity 2 (C2), electric current through LED above produces sampled voltage at resistance 3 (R3), this sampled voltage is delivered in forward path amplifier 1 (A) and is compared with reference voltage (Vr) through feedback amplifier 2 (B), producing control voltage regulates the gate source voltage of metal-oxide-semiconductor (Q), thereby realize constant current, in this circuit, constant electric current is: I
0=R2 × Vr/R3 (R1+R2), wherein Vr is reference voltage, resistance 1 (R1) and resistance 2 (R2) are feedback resistance, and resistance 3 (R3) is sampling resistor, and the power supply of integrated circuit is provided by power supply (S).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210439310.4A CN103813567A (en) | 2012-11-07 | 2012-11-07 | LED constant-current driving method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210439310.4A CN103813567A (en) | 2012-11-07 | 2012-11-07 | LED constant-current driving method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103813567A true CN103813567A (en) | 2014-05-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210439310.4A Pending CN103813567A (en) | 2012-11-07 | 2012-11-07 | LED constant-current driving method |
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| CN (1) | CN103813567A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107484297A (en) * | 2017-08-30 | 2017-12-15 | 合肥新文远信息技术有限公司 | A kind of solar LED (Light Emitting Diode) lamp Constant Current Control System based on MPPT technique |
| CN108376967A (en) * | 2018-02-23 | 2018-08-07 | 扬州海通电子科技有限公司 | A kind of multiple-channel output low voltage difference overcurrent protector |
| CN111044876A (en) * | 2020-01-19 | 2020-04-21 | 重庆大学 | IGBT module bonding wire state monitoring circuit and half-bridge structure monitoring circuit thereof |
-
2012
- 2012-11-07 CN CN201210439310.4A patent/CN103813567A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107484297A (en) * | 2017-08-30 | 2017-12-15 | 合肥新文远信息技术有限公司 | A kind of solar LED (Light Emitting Diode) lamp Constant Current Control System based on MPPT technique |
| CN108376967A (en) * | 2018-02-23 | 2018-08-07 | 扬州海通电子科技有限公司 | A kind of multiple-channel output low voltage difference overcurrent protector |
| CN111044876A (en) * | 2020-01-19 | 2020-04-21 | 重庆大学 | IGBT module bonding wire state monitoring circuit and half-bridge structure monitoring circuit thereof |
| CN111044876B (en) * | 2020-01-19 | 2021-03-23 | 重庆大学 | IGBT module bonding wire state monitoring circuit and half-bridge structure monitoring circuit thereof |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140521 |