CN103687137A - Constant-current driving device for LED circuit - Google Patents
Constant-current driving device for LED circuit Download PDFInfo
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- CN103687137A CN103687137A CN201210327886.1A CN201210327886A CN103687137A CN 103687137 A CN103687137 A CN 103687137A CN 201210327886 A CN201210327886 A CN 201210327886A CN 103687137 A CN103687137 A CN 103687137A
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- voltage
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- electric capacity
- stabiliser tube
- operational amplifier
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Abstract
The invention discloses a constant-current driving device for an LED circuit. The constant-current driving device comprises a step-down regulator, an operational amplifier, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, an LED, a first stabilovolt, a second stabilovolt, a third stabilovolt and an inductor. The sampling resistor (the third resistor) in the circuit determines the design of a constant-current driving circuit and can protect the operation of the whole system, so that the circuit is kept fully stable when the voltage is unstable. According to the invention, the LM2734 step-down regulator and the LM321 operational amplifier are used together to acquire the voltage of the sampling resistor, and together with other resistors and capacitors, an integral and efficient high-power LED constant-current driving circuit is formed. When the voltage is unstable, the LED lamp is protected against damage.
Description
Technical field
The present invention relates to a kind of attachment device of LED circuit, relate in particular to a kind of constant current driving device for LED circuit.
Background technology
In existing LED circuit, subsidiary constant current driving device, when voltage instability timing, will cause the flicker of LED lamp, especially, in high-power LED circuit, while there is the situation of spread of voltage, will cause the damage of LED lamp.
Summary of the invention
Object of the present invention provides a kind of constant current driving device for LED circuit with regard to being in order to address the above problem.
The present invention is achieved through the following technical solutions above-mentioned purpose:
The present invention includes voltage-releasing voltage stabilizer, operational amplifier, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, light-emitting diode, the first voltage-stabiliser tube, the second voltage-stabiliser tube, the 3rd voltage-stabiliser tube and inductance, the electrode input end while of described voltage-releasing voltage stabilizer and the positive pole of power supply, the first end of described the 5th electric capacity, the cathode power supply input of described operational amplifier, the first end of described the second electric capacity is connected with the reset terminal of described voltage-releasing voltage stabilizer, the boost terminal of described voltage-releasing voltage stabilizer is connected with the negative pole of described the 3rd voltage-stabiliser tube with the first end of described the 4th electric capacity simultaneously, the extreme while of power-of described voltage-releasing voltage stabilizer and the second end of described the 5th electric capacity, the first end of described the first electric capacity, the positive pole of described the second voltage-stabiliser tube, the first end of described the first resistance, the negative power supply input of the first end of described the 3rd resistance and described operational amplifier is connected, the feedback end of described voltage-releasing voltage stabilizer is connected with the negative pole of described the first voltage-stabiliser tube with the first end of described the second resistance simultaneously, the control end while of described voltage-releasing voltage stabilizer and the second end of described the 4th electric capacity, the negative pole of described the second voltage-stabiliser tube is connected with the first end of described inductance, the anodal while of described the 3rd voltage-stabiliser tube and the second end of described inductance, the second end of described the first electric capacity and the positive pole of described light-emitting diode are connected, the negative pole of described light-emitting diode is connected with the second end of described the 3rd resistance and the negative signal end of described operational amplifier simultaneously, the positive signal end while of described operational amplifier and the first end of described the 3rd electric capacity, the second end of described the first resistance is connected with the second end of described the second resistance, the signal output part of described operational amplifier is connected with the first end of described the 4th resistance with the second end of described the 3rd electric capacity simultaneously, and the second end of described the 4th resistance is connected with the positive pole of described the first voltage-stabiliser tube.
Beneficial effect of the present invention is:
It is the voltage-releasing voltage stabilizer of LM2734 that the present invention adopts model, coordinates the operational amplifier that model is LM321 to obtain the voltage on sampling resistor, in conjunction with other resistance and electric capacity, just can form complete, an efficient high power LED constant-current driving circuit.Voltage instability occurring regularly, LED lamp is protected, avoid causing the damage of LED lamp.
Accompanying drawing explanation
Accompanying drawing is circuit structure schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in drawings: the present invention includes voltage-releasing voltage stabilizer IC1, operational amplifier IC2, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, LED, the first voltage-stabiliser tube DW1, the second voltage-stabiliser tube DW2, the 3rd voltage-stabiliser tube DW3 and inductance L, the electrode input end VIN while of voltage-releasing voltage stabilizer IC1 and the positive pole of power supply, the first end of the 5th capacitor C 5, the cathode power supply input of operational amplifier IC2, the reset terminal EN of the first end of the second capacitor C 2 and voltage-releasing voltage stabilizer IC1 is connected, the boost terminal BOOST of voltage-releasing voltage stabilizer IC1 is connected with the negative pole of the 3rd voltage-stabiliser tube DW3 with the first end of the 4th capacitor C 4 simultaneously, the extreme GND while of power-of voltage-releasing voltage stabilizer IC1 and the second end of the 5th capacitor C 5, the first end of the first capacitor C 1, the positive pole of the second voltage-stabiliser tube DW2, the first end of the first resistance R 1, the negative power supply input of the first end of the 3rd resistance R 3 and operational amplifier IC2 is connected, the feedback end FB of voltage-releasing voltage stabilizer IC1 is connected with the negative pole of the first voltage-stabiliser tube DW1 with the first end of the second resistance R 2 simultaneously, the control end SW while of voltage-releasing voltage stabilizer IC1 and the second end of the 4th capacitor C 4, the second negative pole of voltage-stabiliser tube DW2 and the first end of inductance L are connected, the anodal while of the 3rd voltage-stabiliser tube DW3 and the second end of inductance L, the second end of the first capacitor C 1 and the positive pole of LED are connected, the negative pole of LED is connected with the second end of the 3rd resistance R 3 and the negative signal end of operational amplifier IC2 simultaneously, the positive signal end while of operational amplifier IC2 and the first end of the 3rd capacitor C 3, the second end of the first resistance R 1 is connected with the second end of the second resistance R 2, the signal output part of operational amplifier IC2 is connected with the first end of the 4th resistance R 4 with the second end of the 3rd capacitor C 3 simultaneously, and the second end of the 4th resistance R 4 is connected with the positive pole of the first voltage-stabiliser tube DW1.
As shown in drawings: the 3rd resistance R 3 of the sampling resistor in circuit has determined the design of constant-current drive circuit; and the operation of whole system is played to protective effect; make circuit in spread of voltage, keep stable fully, therefore the design parameter of the 3rd resistance R 3 is most important to saving the energy.In general, if require the variation of the drive current in LED circuit to be no more than 5%～10% of nominal value, adopting so precision is that 2% resistance is just enough.The typical fluctuation range of the drive current in LED circuit is ± 10%.The power consuming due to sampling resistor is larger, should avoid using lower-powered Chip-R.In addition, the present invention is applicable to the constant current driving of a plurality of high-powered LED lamps.
Claims (1)
1. for a constant current driving device for LED circuit, it is characterized in that: comprise voltage-releasing voltage stabilizer, operational amplifier, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, light-emitting diode, the first voltage-stabiliser tube, the second voltage-stabiliser tube, the 3rd voltage-stabiliser tube and inductance, the electrode input end while of described voltage-releasing voltage stabilizer and the positive pole of power supply, the first end of described the 5th electric capacity, the cathode power supply input of described operational amplifier, the first end of described the second electric capacity is connected with the reset terminal of described voltage-releasing voltage stabilizer, the boost terminal of described voltage-releasing voltage stabilizer is connected with the negative pole of described the 3rd voltage-stabiliser tube with the first end of described the 4th electric capacity simultaneously, the extreme while of power-of described voltage-releasing voltage stabilizer and the second end of described the 5th electric capacity, the first end of described the first electric capacity, the positive pole of described the second voltage-stabiliser tube, the first end of described the first resistance, the negative power supply input of the first end of described the 3rd resistance and described operational amplifier is connected, the feedback end of described voltage-releasing voltage stabilizer is connected with the negative pole of described the first voltage-stabiliser tube with the first end of described the second resistance simultaneously, the control end while of described voltage-releasing voltage stabilizer and the second end of described the 4th electric capacity, the negative pole of described the second voltage-stabiliser tube is connected with the first end of described inductance, the anodal while of described the 3rd voltage-stabiliser tube and the second end of described inductance, the second end of described the first electric capacity and the positive pole of described light-emitting diode are connected, the negative pole of described light-emitting diode is connected with the second end of described the 3rd resistance and the negative signal end of described operational amplifier simultaneously, the positive signal end while of described operational amplifier and the first end of described the 3rd electric capacity, the second end of described the first resistance is connected with the second end of described the second resistance, the signal output part of described operational amplifier is connected with the first end of described the 4th resistance with the second end of described the 3rd electric capacity simultaneously, and the second end of described the 4th resistance is connected with the positive pole of described the first voltage-stabiliser tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210327886.1A CN103687137A (en) | 2012-09-07 | 2012-09-07 | Constant-current driving device for LED circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210327886.1A CN103687137A (en) | 2012-09-07 | 2012-09-07 | Constant-current driving device for LED circuit |
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| Publication Number | Publication Date |
|---|---|
| CN103687137A true CN103687137A (en) | 2014-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210327886.1A Pending CN103687137A (en) | 2012-09-07 | 2012-09-07 | Constant-current driving device for LED circuit |
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| CN (1) | CN103687137A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104994620A (en) * | 2014-11-29 | 2015-10-21 | 成都颉盛科技有限公司 | LED bootstrap control system based on step-down constant current |
| CN106655818A (en) * | 2016-12-26 | 2017-05-10 | 许昌职业技术学院 | Generator voltage stabilizer |
| CN112271924A (en) * | 2020-11-11 | 2021-01-26 | 湖北华中光电科技有限公司 | Constant-current output circuit and method based on voltage feedback of buck converter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201593708U (en) * | 2010-01-28 | 2010-09-29 | 陈清尧 | Led illuminating lamp |
| CN201657408U (en) * | 2010-01-05 | 2010-11-24 | 艾迪光电（杭州）有限公司 | Starting overshoot current suppression circuit |
| CN202818688U (en) * | 2012-07-06 | 2013-03-20 | 成都市思博睿科技有限公司 | Constant-current drive apparatus used for LED circuit |
| CN202857054U (en) * | 2012-09-07 | 2013-04-03 | 成都默一科技有限公司 | Constant-current drive device for LED circuit |
-
2012
- 2012-09-07 CN CN201210327886.1A patent/CN103687137A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201657408U (en) * | 2010-01-05 | 2010-11-24 | 艾迪光电（杭州）有限公司 | Starting overshoot current suppression circuit |
| CN201593708U (en) * | 2010-01-28 | 2010-09-29 | 陈清尧 | Led illuminating lamp |
| CN202818688U (en) * | 2012-07-06 | 2013-03-20 | 成都市思博睿科技有限公司 | Constant-current drive apparatus used for LED circuit |
| CN202857054U (en) * | 2012-09-07 | 2013-04-03 | 成都默一科技有限公司 | Constant-current drive device for LED circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104994620A (en) * | 2014-11-29 | 2015-10-21 | 成都颉盛科技有限公司 | LED bootstrap control system based on step-down constant current |
| CN106655818A (en) * | 2016-12-26 | 2017-05-10 | 许昌职业技术学院 | Generator voltage stabilizer |
| CN112271924A (en) * | 2020-11-11 | 2021-01-26 | 湖北华中光电科技有限公司 | Constant-current output circuit and method based on voltage feedback of buck converter |
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Application publication date: 20140326 |