CN202634790U - LED-lamp isolation driving power supply - Google Patents
LED-lamp isolation driving power supply Download PDFInfo
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- CN202634790U CN202634790U CN 201220195584 CN201220195584U CN202634790U CN 202634790 U CN202634790 U CN 202634790U CN 201220195584 CN201220195584 CN 201220195584 CN 201220195584 U CN201220195584 U CN 201220195584U CN 202634790 U CN202634790 U CN 202634790U
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Abstract
The utility model provides an LED-lamp isolation driving power supply. The power supply comprises a rectification circuit, an isolation transformer T1, an MOS tube, a control chip U1, an output rectification and filtration circuit and an output feedback circuit, wherein an input side of the rectification circuit is connected to an ac power supply Vin via a surge absorption circuit and an EMC filter circuit, an output side of the rectification circuit is connected to a primary winding of the isolation transformer T1 and the MOS tube via a PFC lifting circuit, the primary winding of the isolation transformer T1 is in parallel connection with the MOS tube, and is connected to a load LED and a sampling circuit via the output rectification and filtration circuit, the sampling circuit is connected to input of a feedback circuit, output of the feedback circuit is connected with input of the control chip U1, and output of the control chip U1 is connected with a gate electrode of the MOS tube. According to the LED-lamp isolation driving power supply provided in the utility model, an output voltage stabilizing circuit and a current control circuit are arranged in the feedback circuit, so that the stability of the output voltage is controllable, the current precision is adjustable, and the constant current is highly precise.
Description
Technical field
The utility model relates to a kind of driving power, especially a kind of LED fluorescent lamp isolation drive power supply.
Background technology
At present the LED driving power is to adopt non-isolation scheme usually, but be the high pressure resistant test of non-isolation LED driving power be difficult to through, thereby can't pass through relevant authentication, and output voltage is stable uncontrollable, current precision is difficult to adjusting.
The utility model content
The technical problem that the utility model will solve is, a kind of LED lamp isolation drive power supply is provided, and its output voltage stability is controlled, the current precision scalable, and constant current accuracy is high.
The utility model is that the technical scheme that its technical problem of solution is adopted is: a kind of LED lamp isolation drive power supply is provided; Comprise rectification circuit, isolating transformer T1, metal-oxide-semiconductor, control chip U1, current rectifying and wave filtering circuit and feedback circuit; The input side of said rectification circuit is successively through being connected to AC power Vin behind pop wave absorbing circuit, the EMC filter circuit; The outlet side of said rectification circuit promotes elementary winding of isolating transformer T1 and the metal-oxide-semiconductor that circuit is connected to mutual series connection through PFC; Said isolating transformer T1 secondary winding connects load LED and sample circuit behind output rectifier and filter; Said sample circuit is connected to the input of feedback circuit, and the output of this feedback circuit is connected to the input of control chip U1, and the output of said control chip U1 is connected to the gate pole of metal-oxide-semiconductor.
Above-mentioned LED lamp isolation drive power supply, wherein, said PFC promotes circuit and is made up of diode D5, diode D6, diode D7 and resistance R 1 and capacitor C 3, capacitor C 4.
Above-mentioned LED lamp isolation drive power supply; Wherein, One end of the negative electrode of said diode D5, capacitor C 4 connects the output head anode of rectification circuit 3, and the anode of this diode D5 connects an end of capacitor C 3, an end of resistance R 1, and the other end of resistance R 1 connects the negative electrode of diode D6; The anode of diode D6 connects the other end of capacitor C 4, the negative electrode of diode D7, and the anode of the other end of capacitor C 3, diode D7 connects the negative pole of output end of rectification circuit 3.
Above-mentioned LED lamp isolation drive power supply, wherein, said feedback circuit comprises output voltage stabilizing circuit and current control circuit.
Above-mentioned LED lamp isolation drive power supply, wherein, said output voltage stabilizing circuit is made up of optocoupler PC817 and voltage-stabiliser tube ZD1, and the model of said optocoupler PC817 is EL817C.
Above-mentioned LED lamp isolation drive power supply, wherein, said Current Control is made up of resistance R 16 and triode Q2, resistance R 17 and resistance R 14, and the model of said triode is 2SC8050.
Above-mentioned LED lamp isolation drive power supply wherein, also comprises auxiliary power circuit, and the output of said auxiliary power circuit connects the power end of control chip U1.
Above-mentioned LED lamp isolation drive power supply, wherein, said auxiliary power circuit comprises winding power supply circuits and high-voltage power supply circuit.
Above-mentioned LED lamp isolation drive power supply, wherein, the model of described control chip U1 is OB2203.
Above-mentioned LED lamp isolation drive power supply, wherein, the elementary winding of said isolating transformer T1 connects the peak absorbance circuit.
Compared with prior art; Have following beneficial effect: the LED lamp isolation drive power supply that the utility model provides through output voltage stabilizing circuit and current control circuit are set in feedback circuit, makes output voltage stability controlled; The current precision scalable, constant current accuracy is high.
Description of drawings
To combine accompanying drawing and embodiment that the utility model is described further below, in the accompanying drawing:
Fig. 1 is the electrical block diagram of a kind of LED lamp of the utility model isolation drive power supply.
Among the last figure:
1 pop wave absorbing circuit 2EMC filter circuit, 3 rectification circuits
4PFC promotes circuit 5 peak absorbance circuit 6 current rectifying and wave filtering circuits
7 sample circuits, 8 feedback circuits, 9 auxiliary power circuits
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer, below in conjunction with embodiment and accompanying drawing, to the utility model further explain:
Referring to Fig. 1; The utility model provides a kind of LED lamp isolation drive power supply; Comprise rectification circuit 3, isolating transformer T1, metal-oxide-semiconductor Q1, control chip U1, current rectifying and wave filtering circuit 6 and feedback circuit 8; The input side of said rectification circuit 3 is successively through being connected to AC power Vin behind pop wave absorbing circuit 1, the EMC filter circuit 2; 3 couples of AC power Vin of this rectification circuit carry out full-wave rectification; The resistance TVR1 of said pop wave absorbing circuit 1 and resistance VAR1 form electric current and absorb circuit with abrupt voltage wave, and said EMC filter circuit 2 is made up of capacitor C 1, capacitor C 2 and inductance T2, behind the PFC lifting circuit 4 of the outlet side of said rectification circuit 3 via diode D5, diode D6, diode D7 and resistance R 1 and capacitor C 3, capacitor C 4 compositions; Be connected to the elementary winding of isolating transformer T1 that is in series with metal-oxide-semiconductor Q1; And said PFC promotes the negative electrode of diode D5 in the circuit 4, an end of capacitor C 4 connects the output head anode of rectification circuit 3, and the anode of this diode D5 connects an end of capacitor C 3, an end of resistance R 1, and the other end of resistance R 1 connects the negative electrode of diode D6; The anode of diode D6 connects the other end of capacitor C 4, the negative electrode of diode D7, and the anode of the other end of capacitor C 3, diode D7 connects the negative pole of output end of rectification circuit 3.Said isolating transformer T1 with energy from elementary winding coupled to secondary winding; Behind the current rectifying and wave filtering circuit 6 of said isolating transformer T1 secondary winding via high speed rectifier diode D10, capacitor C 8 compositions, connect load LED and the sample circuit 7 that comprises resistance R 13, said sample circuit 7 is connected to the input of feedback circuit 8; Said feedback circuit comprises output voltage stabilizing circuit and current control circuit; Said output voltage stabilizing circuit is made up of optocoupler PC817 and voltage-stabiliser tube ZD1, the size that can regulate output voltage through the voltage stabilizing value that changes voltage-stabiliser tube ZD1, and the model of said optocoupler PC817 is EL817C; Said Current Control is made up of resistance R 16 and triode Q2, resistance R 17 and resistance R 14; Resistance value size through changing R14 is come constant maximum output current, and the model of said triode is 2SC8050, and the output of said feedback circuit 8 is connected to the input of control chip U1; The output of said control chip U1 is connected to the gate pole of metal-oxide-semiconductor 5; The power end of said control chip U1 connects the output of auxiliary power circuit 9, and said auxiliary power circuit 9 comprises by winding power supply circuits of assisting winding, diode D9 and capacitor C 6 to form and the high-voltage power supply circuit of being made up of resistance R 5 and capacitor C 6, when driving power opens machine; Is control chip U1 power supply by high-voltage power supply circuit, opens behind the machine through the power supply of winding power supply circuits.Preferably, the model of said control chip U1 is OB2203.In addition, the elementary winding of said isolating transformer T1 connects the peak absorbance circuit of being made up of supper-fast diode D8, capacitor C 5 and resistance R 3, R4, R5, and protection metal-oxide-semiconductor Q1 is not punctured by crest voltage.
In sum, the LED lamp isolation drive power supply that the utility model provides through output voltage stabilizing circuit and current control circuit are set in feedback circuit 8, makes output voltage stability controlled, the current precision scalable, and constant current accuracy is high.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the utility model.
Claims (10)
1. LED lamp isolation drive power supply; Comprise rectification circuit, isolating transformer T1, metal-oxide-semiconductor, control chip U1, current rectifying and wave filtering circuit and feedback circuit; It is characterized in that: the input side of said rectification circuit is successively through being connected to AC power Vin behind pop wave absorbing circuit, the EMC filter circuit; The outlet side of said rectification circuit promotes elementary winding of isolating transformer T1 and the metal-oxide-semiconductor that circuit is connected to mutual series connection through PFC; Said isolating transformer T1 secondary winding connects load LED and sample circuit behind output rectifier and filter; Said sample circuit is connected to the input of feedback circuit, and the output of this feedback circuit is connected to the input of control chip U1, and the output of said control chip U1 is connected to the gate pole of metal-oxide-semiconductor.
2. LED lamp isolation drive power supply according to claim 1 is characterized in that: said PFC promotes circuit and is made up of diode D5, diode D6, diode D7 and resistance R 1 and capacitor C 3, capacitor C 4.
3. LED lamp isolation drive power supply according to claim 2; It is characterized in that: an end of the negative electrode of said diode D5, capacitor C 4 connects the output head anode of rectification circuit 3; The anode of this diode D5 connects an end of capacitor C 3, an end of resistance R 1; The other end of resistance R 1 connects the negative electrode of diode D6, and the anode of diode D6 connects the other end of capacitor C 4, the negative electrode of diode D7, and the anode of the other end of capacitor C 3, diode D7 connects the negative pole of output end of rectification circuit 3.
4. LED lamp isolation drive power supply according to claim 3, it is characterized in that: said feedback circuit comprises output voltage stabilizing circuit and current control circuit.
5. LED lamp isolation drive power supply according to claim 4, it is characterized in that: said output voltage stabilizing circuit is made up of optocoupler PC817 and voltage-stabiliser tube ZD1, and the model of said optocoupler PC817 is EL817C.
6. LED lamp isolation drive power supply according to claim 4 is characterized in that: said Current Control is made up of resistance R 16 and triode Q2, resistance R 17 and resistance R 14, and the model of said triode is 2SC8050.
7. according to claim 5 or 6 described LED lamp isolation drive power supplys, it is characterized in that: also comprise auxiliary power circuit, and the output of said auxiliary power circuit connects the power end of control chip U1.
8. LED lamp isolation drive power supply according to claim 7, it is characterized in that: said auxiliary power circuit comprises winding power supply circuits and high-voltage power supply circuit.
9. LED lamp isolation drive power supply according to claim 8, it is characterized in that: the model of described control chip U1 is OB2203.
10. LED lamp isolation drive power supply according to claim 9 is characterized in that: the elementary winding of said isolating transformer T1 connects the peak absorbance circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220195584 CN202634790U (en) | 2012-05-03 | 2012-05-03 | LED-lamp isolation driving power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220195584 CN202634790U (en) | 2012-05-03 | 2012-05-03 | LED-lamp isolation driving power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202634790U true CN202634790U (en) | 2012-12-26 |
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ID=47387923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220195584 Expired - Fee Related CN202634790U (en) | 2012-05-03 | 2012-05-03 | LED-lamp isolation driving power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202634790U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104994654A (en) * | 2015-07-14 | 2015-10-21 | 盐城工学院 | LED drive circuit |
| CN106793342A (en) * | 2017-02-15 | 2017-05-31 | 江南大学 | A kind of long-life LED drive power based on ripple compensation |
| CN113543409A (en) * | 2021-08-05 | 2021-10-22 | 深圳深川智能有限公司 | Driving power supply of LED lamp |
-
2012
- 2012-05-03 CN CN 201220195584 patent/CN202634790U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104994654A (en) * | 2015-07-14 | 2015-10-21 | 盐城工学院 | LED drive circuit |
| CN106793342A (en) * | 2017-02-15 | 2017-05-31 | 江南大学 | A kind of long-life LED drive power based on ripple compensation |
| CN113543409A (en) * | 2021-08-05 | 2021-10-22 | 深圳深川智能有限公司 | Driving power supply of LED lamp |
| CN113543409B (en) * | 2021-08-05 | 2024-01-12 | 深圳深川智能有限公司 | Driving power supply of LED lamp |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: JIANGSU JINGZHENG ELECTRONIC CO., LTD. Free format text: FORMER OWNER: CHANGZHOU RUN-ZE LIGHT ENERGY SCIENCE AND TECHNOLOGY CO., LTD. Effective date: 20121228 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 213000 CHANGZHOU, JIANGSU PROVINCE TO: 214200 WUXI, JIANGSU PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20121228 Address after: Jin Zhang Houzhu Industrial Park in Jiangsu city of Yixing Province Zhang Zhu Zhen 214200 Patentee after: Jiangsu Jingzheng Electronic Co., Ltd. Address before: 213000 Jiangsu city of Changzhou province Wujin high tech Industrial Development Zone (the administrative center of Wujin Branch Center District No. 5 Building 102, room 104) Patentee before: Changzhou Runze Luminous Energy Technology Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121226 Termination date: 20150503 |
|
| EXPY | Termination of patent right or utility model |