CN202818688U - Constant-current drive apparatus used for LED circuit - Google Patents
Constant-current drive apparatus used for LED circuit Download PDFInfo
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- CN202818688U CN202818688U CN 201220325389 CN201220325389U CN202818688U CN 202818688 U CN202818688 U CN 202818688U CN 201220325389 CN201220325389 CN 201220325389 CN 201220325389 U CN201220325389 U CN 201220325389U CN 202818688 U CN202818688 U CN 202818688U
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- stabiliser tube
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Abstract
The utility model discloses a constant-current drive apparatus used for an LED circuit, comprising a voltage step-down voltage stabilizer, an operation 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, a light emitting diode, a first voltage stabilizing tube, a second voltage stabilizing tube, a third voltage stabilizing tube and an inductor. The sampling resistor, i.e., the third resistor, in the circuit determines the design of a constant-current drive circuit, plays a protection effect on the operation of a whole system, and keeps the circuit to be stable enough when the voltage is unstable. The constant-current drive apparatus used for an LED circuit employs an LM2734 voltage step-down voltage stabilizer, and obtains the voltage across the sampling resistor in cooperation with an LM321 operation amplifier, and the LM2734 voltage step-down voltage stabilizer and the LM321 operation amplifier are combined with other resistors and capacitors to form a complete high-efficient high-power LED constant-current circuit, thereby protecting LED lamps when the voltage is unstable, and preventing the LED lamps from being damaged.
Description
Technical field
The utility model relates to a kind of attachment device of led circuit, relates 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 the voltage instability timing, will cause the flicker of LED lamp, especially in the high-power LED circuit, when the situation of spread of voltage occurring, will cause the damage of LED lamp.
Summary of the invention
The purpose of this utility model provides a kind of constant current driving device for led circuit with regard to being in order to address the above problem.
The utility model is achieved through the following technical solutions above-mentioned purpose:
The utility model comprises 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 be connected the reset terminal of voltage-releasing voltage stabilizer and connect, the boost terminal of described voltage-releasing voltage stabilizer simultaneously with the first end of described the 4th electric capacity be connected the negative pole of the 3rd voltage-stabiliser tube and be connected, the power-of described voltage-releasing voltage stabilizer extreme simultaneously with 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 first end of described the 3rd resistance be connected the negative power supply input of operational amplifier and connect, the feedback end of described voltage-releasing voltage stabilizer simultaneously with the first end of described the second resistance be connected the negative pole of the first voltage-stabiliser tube and be connected, 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 be connected the first end of inductance and connect, 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 be connected the positive pole of light-emitting diode and connect, the negative pole of described light-emitting diode simultaneously with the second end of described the 3rd resistance be connected the negative signal end of operational amplifier and be connected, 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 be connected the second end of the second resistance and connect, the signal output part of described operational amplifier simultaneously with the second end of described the 3rd electric capacity be connected the first end of the 4th resistance and be connected, the second end of described the 4th resistance is connected with the positive pole of described the first voltage-stabiliser tube.
The beneficial effects of the utility model are:
It is the voltage-releasing voltage stabilizer of LM2734 that the utility model adopts model, and the cooperation model is that the operational amplifier of LM321 obtains the voltage on the sampling resistor, just can consist of complete, an efficient high power LED constant-current driving circuit in conjunction with other resistance and electric capacity.Voltage instability occuring regularly, the LED lamp is protected, avoid causing the damage of LED lamp.
Description of drawings
Accompanying drawing is circuit structure schematic diagram of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
As shown in drawings: the utility model comprises 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 first end of the second capacitor C 2 is connected reset terminal EN and is connected with voltage-releasing voltage stabilizer IC1, the boost terminal BOOST of voltage-releasing voltage stabilizer IC1 is connected with the first end of the 4th capacitor C 4 and the negative pole of the 3rd voltage-stabiliser tube DW3 simultaneously, the extreme GND of the power-of voltage-releasing voltage stabilizer IC1 simultaneously with 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 first end of the 3rd resistance R 3 is connected the negative power supply input and is connected with operational amplifier IC2, the feedback end FB of voltage-releasing voltage stabilizer IC1 simultaneously with the first end of the second resistance R 2 be connected the negative pole of voltage-stabiliser tube DW1 and be connected, the control end SW while of voltage-releasing voltage stabilizer IC1 and the second end of the 4th capacitor C 4, the negative pole of the second voltage-stabiliser tube DW2 is connected first end and is connected with inductance L, 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 is connected positive pole and is connected with LED, the negative pole of LED simultaneously and the second end of the 3rd resistance R 3 be connected the negative signal end with operational amplifier IC2 and be connected, 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 be connected the second end of resistance R 2 and connect, the signal output part of operational amplifier IC2 is connected with the second end of the 3rd capacitor C 3 and the first end of the 4th resistance R 4 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: sampling resistor the 3rd resistance R 3 in the circuit has determined the design of constant-current drive circuit; and the operation of whole system played protective effect; so that circuit keeps stable fully in spread of voltage, 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 the 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 the led circuit is ± 10%.Because the power that sampling resistor consumes is larger, should avoid using lower-powered Chip-R.In addition, the utility model is applicable to the constant current driving of a plurality of high-powered LED lamps.
Claims (1)
1. constant current driving device that is used 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 be connected the reset terminal of voltage-releasing voltage stabilizer and connect, the boost terminal of described voltage-releasing voltage stabilizer simultaneously with the first end of described the 4th electric capacity be connected the negative pole of the 3rd voltage-stabiliser tube and be connected, the power-of described voltage-releasing voltage stabilizer extreme simultaneously with 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 first end of described the 3rd resistance be connected the negative power supply input of operational amplifier and connect, the feedback end of described voltage-releasing voltage stabilizer simultaneously with the first end of described the second resistance be connected the negative pole of the first voltage-stabiliser tube and be connected, 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 be connected the first end of inductance and connect, 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 be connected the positive pole of light-emitting diode and connect, the negative pole of described light-emitting diode simultaneously with the second end of described the 3rd resistance be connected the negative signal end of operational amplifier and be connected, 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 be connected the second end of the second resistance and connect, the signal output part of described operational amplifier simultaneously with the second end of described the 3rd electric capacity be connected the first end of the 4th resistance and be connected, 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 |
|---|---|---|---|
| CN 201220325389 CN202818688U (en) | 2012-07-06 | 2012-07-06 | Constant-current drive apparatus used for LED circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220325389 CN202818688U (en) | 2012-07-06 | 2012-07-06 | Constant-current drive apparatus used for LED circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202818688U true CN202818688U (en) | 2013-03-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220325389 Expired - Fee Related CN202818688U (en) | 2012-07-06 | 2012-07-06 | Constant-current drive apparatus used for LED circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202818688U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103687137A (en) * | 2012-09-07 | 2014-03-26 | 成都默一科技有限公司 | Constant-current driving device for LED circuit |
| CN104219812A (en) * | 2013-05-30 | 2014-12-17 | 深圳市海洋王照明工程有限公司 | Constant current sampling circuit and lamp thereof |
| 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 |
-
2012
- 2012-07-06 CN CN 201220325389 patent/CN202818688U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103687137A (en) * | 2012-09-07 | 2014-03-26 | 成都默一科技有限公司 | Constant-current driving device for LED circuit |
| CN104219812A (en) * | 2013-05-30 | 2014-12-17 | 深圳市海洋王照明工程有限公司 | Constant current sampling circuit and lamp thereof |
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130320 Termination date: 20130706 |