CN203884032U - A primary side feedback LED drive circuit - Google Patents
A primary side feedback LED drive circuit Download PDFInfo
- Publication number
- CN203884032U CN203884032U CN201420139435.XU CN201420139435U CN203884032U CN 203884032 U CN203884032 U CN 203884032U CN 201420139435 U CN201420139435 U CN 201420139435U CN 203884032 U CN203884032 U CN 203884032U
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- 238000004804 winding Methods 0.000 claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims abstract description 14
- 238000001914 filtration Methods 0.000 claims description 15
- 238000005070 sampling Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model relates to a switching power supply technical field especially relates to a former limit feedback LED drive circuit, and it includes rectifier and filter circuit, switching transformer, switch tube Q1, auxiliary winding, rectifier diode VD5, filter capacitor C3 and chip BP3309, and it is simpler to have a circuit structure, effective reduce cost's advantage.
Description
Technical field
The utility model relates to switch power technology field, relates in particular to a kind of former limit feedback LED drive circuit.
Background technology
LED, as novel energy-conserving light source, has the features such as light efficiency is high, environmental protection, life-span length.LED needs the driving power of constant current output while using, LED driving power is that power supply supply is converted to specific electric current and voltage with the luminous power supply changeover device of driving LED, generally, the input of LED driving power comprises high pressure industrial frequency AC (being civil power), low-voltage direct, high voltage direct current, low pressure high-frequency ac etc.LED driving power belongs to Switching Power Supply, and the quality and reliability of Switching Power Supply depends on its circuit design, production technology, and the quality of device, and meanwhile, LED driving power directly affects the useful life of LED.Mostly adopt at present output constant current feedback system, sort circuit carries out current sample from output, by amplifier, carries out signal amplification, and utilizes light-coupled isolation feedback.This circuit has feedback circuit complexity, the shortcoming that cost is relatively high.
Summary of the invention
The purpose of this utility model is to provide for the deficiencies in the prior art a kind of former limit feedback LED drive circuit, and its circuit structure is simpler, can effectively reduce costs.
For achieving the above object, the utility model adopts following technical scheme: a kind of former limit feedback LED drive circuit, and it comprises current rectifying and wave filtering circuit, switch transformer, switching tube Q1, auxiliary winding, rectifier diode VD5, filter capacitor C3 and chip BP3309; The input of described current rectifying and wave filtering circuit connects alternating voltage AC, the armature winding N1 of the output connecting valve transformer of current rectifying and wave filtering circuit, and the secondary winding N2 of switch transformer is connected with rectifier diode VD1 and capacitor C 2; Described armature winding N1 connecting valve pipe Q1 leaks level, and the grid of switching tube Q1 connects the OUT pin of chip BP3309, and the source electrode of switching tube Q1 connects the ST pin of chip BP3309 and one end of sampling resistor R5, the other end ground connection of sampling resistor R5; The output of current rectifying and wave filtering circuit connects the VCC pin of chip BP3309 successively after contact resistance R1, R2; Auxiliary winding connects the positive pole of rectifier diode VD5, and the negative pole of rectifier diode VD5 connects the positive pole of filter capacitor C3 and the VCC pin of chip BP3309, the minus earth of filter capacitor C3; The negative pole of rectifier diode VD5 is also connected with resistance R 4 and R6 in turn, and the LN pin of chip BP3309 is connected between resistance R 4 and R6, resistance R 6 ground connection; The input of described current rectifying and wave filtering circuit is connected with fuse; The input of described current rectifying and wave filtering circuit is connected with thermistor.
The utility model beneficial effect is: a kind of former limit of the utility model feedback LED drive circuit, it comprises current rectifying and wave filtering circuit, switch transformer, switching tube Q1, auxiliary winding, rectifier diode VD5, filter capacitor C3 and chip BP3309, there is circuit structure simpler, the advantage effectively reducing costs.
Accompanying drawing explanation
Accompanying drawing 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described: as shown in Figure 1, a kind of former limit described in the utility model feedback LED drive circuit, it comprises current rectifying and wave filtering circuit, switch transformer, switching tube Q1, auxiliary winding, rectifier diode VD5, filter capacitor C3 and chip BP3309; The input of described current rectifying and wave filtering circuit connects alternating voltage AC, the armature winding N1 of the output connecting valve transformer of current rectifying and wave filtering circuit, and the secondary winding N2 of switch transformer is connected with rectifier diode VD1 and capacitor C 2; Described armature winding N1 connecting valve pipe Q1 leaks level, and the grid of switching tube Q1 connects the OUT pin of chip BP3309, and the source electrode of switching tube Q1 connects the ST pin of chip BP3309 and one end of sampling resistor R5, the other end ground connection of sampling resistor R5; The output of current rectifying and wave filtering circuit connects the VCC pin of chip BP3309 successively after contact resistance R1, R2; Auxiliary winding connects the positive pole of rectifier diode VD5, and the negative pole of rectifier diode VD5 connects the positive pole of filter capacitor C3 and the VCC pin of chip BP3309, the minus earth of filter capacitor C3; The negative pole of rectifier diode VD5 is also connected with resistance R 4 and R6 in turn, and the LN pin of chip BP3309 is connected between resistance R 4 and R6, resistance R 6 ground connection; The input of described current rectifying and wave filtering circuit is connected with fuse; The input of described current rectifying and wave filtering circuit is connected with thermistor, thermistor can prevent that surge current from causing damage to device below, when power supply is not also switched on, the resistance of thermistor is very large, thus can play the effect of limit inrush currents, after the normal work of circuit, thermistor is owing to there being electric current to pass through to generate heat, cause resistance can become very little, so after normal work, the power loss of thermistor is very little.The advantage of this circuit is former limit FEEDBACK CONTROL, need not add optocoupler and source of stable pressure, has reduced cost, has circuit structure simpler, the advantage effectively reducing costs.
The above is only better embodiment of the present utility model, and the equivalence of doing according to structure, feature and principle described in the utility model patent claim therefore all changes or modifies, and is included in the utility model patent claim.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420139435.XU CN203884032U (en) | 2014-03-26 | 2014-03-26 | A primary side feedback LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420139435.XU CN203884032U (en) | 2014-03-26 | 2014-03-26 | A primary side feedback LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203884032U true CN203884032U (en) | 2014-10-15 |
Family
ID=51684489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420139435.XU Expired - Fee Related CN203884032U (en) | 2014-03-26 | 2014-03-26 | A primary side feedback LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203884032U (en) |
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2014
- 2014-03-26 CN CN201420139435.XU patent/CN203884032U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141015 Termination date: 20150326 |
|
| EXPY | Termination of patent right or utility model |