CN204578843U - A kind of LED drive circuit - Google Patents
A kind of LED drive circuit Download PDFInfo
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- CN204578843U CN204578843U CN201520257603.XU CN201520257603U CN204578843U CN 204578843 U CN204578843 U CN 204578843U CN 201520257603 U CN201520257603 U CN 201520257603U CN 204578843 U CN204578843 U CN 204578843U
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Abstract
The utility model discloses a kind of LED drive circuit, comprise rectifier bridge Q, chip U1, transformer T, triode VT1 and one-way SCR VS, rectifier bridge Q pin 1 is connected 220V alternating current two ends respectively with rectifier bridge Q pin 2, rectifier bridge Q pin 3 connects the G pole of the K pole of electric capacity C5, resistance R2, one-way SCR VS, electric capacity C2, chip U1 pin 5, electric capacity C4 and resistance R9, resistance R2 other end contact resistance R1 and one-way SCR VS respectively respectively.The voltage that the utility model LED drive circuit utilizes the intrinsic reference voltage source of chip U1 to provide and TL431 form structure input LED drive circuit simple, with low cost, withstand voltage relatively low switching tube can be selected, both guaranteed safely, reduce costs, turn reduce loss, stability is high.
Description
Technical field
The utility model relates to a kind of drive circuit, specifically a kind of LED drive circuit.
Background technology
In energy crisis and climate warming problem more and more serious today, energy-conservationly become social focus subject under discussion with environmental protection.LED gets more and more people's extensive concerning because of features such as plurality of advantages such as it is efficient, energy-saving and environmental protection, life-span length, rich color, little, the resistance to flicker of volume, reliability are high, regulation and control are convenient, is considered to 21 century the most promising lighting source.Traditional incandescent lamp efficiency is low, power consumption is high; Fluorescent lamp power saving, but useful life is short, frangible, and there is mercury pollution in discarded object; There is the shortcomings such as efficiency is low, power consumption is high, the life-span is short, hazards of electromagnetic radiation in high-intensity gas discharge lamp; If current poor efficiency, the traditional lighting of highly energy-consuming can be replaced with LED illumination, current more and more urgent energy shortage and ecological deterioration problem can be alleviated undoubtedly.Due to voltage-current characteristic and the temperature characterisitic of LED self, make the susceptibility of LED to electric current be higher than susceptibility to voltage, therefore can not be powered directly to LED by traditional power supply.Therefore, make with LED the problem that first lighting source will solve power drives, how to provide stability is high, cost is low, fail safe is high LED drive circuit to become the research direction of Ge great LED producer.
Utility model content
The purpose of this utility model is the LED drive circuit providing a kind of stability high, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of LED drive circuit, comprise rectifier bridge Q, chip U1, transformer T, triode VT1 and one-way SCR VS, described rectifier bridge Q pin 1 is connected 220V alternating current two ends respectively with rectifier bridge Q pin 2, rectifier bridge Q pin 3 connects electric capacity C5 respectively, resistance R2, the K pole of one-way SCR VS, electric capacity C2, chip U1 pin 5, electric capacity C4 and resistance R9, the G pole of resistance R2 other end difference contact resistance R1 and one-way SCR VS, the resistance R1 other end connects rectifier bridge Q pin 4 respectively, the electric capacity C5 other end, resistance R10, electric capacity C7 and transformer T coil L1, the resistance R10 other end connects ground capacity C1 respectively, diode D1 negative pole and chip U1 pin 7, diode D2 positive pole connects grounded inductor L3, chip U1 pin 1 connects chip U1 pin 2 by electric capacity C3, chip U1 pin 8 is connecting triode VT1 emitter and resistance R3 respectively, the resistance R3 other end is contact resistance R4 and triode VT1 base stage respectively, the resistance R4 other end connects the A pole of one-way SCR VS, triode VT1 collector electrode contact resistance R5, the resistance R5 other end connects chip U1 pin 3 respectively, resistance R8 and the electric capacity C4 other end, the S pole of the resistance R8 other end difference contact resistance R9 other end and metal-oxide-semiconductor VR, the G pole of metal-oxide-semiconductor VR connects chip U1 pin 6 by resistance R7, D pole contact resistance R11 and the transformer T coil L1 other end respectively of metal-oxide-semiconductor VR, transformer T coil L2 one end contact resistance R6, the resistance R6 other end connects electric capacity C6 and resistance R12 respectively, the resistance R12 other end connects LED, the LED other end connects the electric capacity C6 other end and the transformer T coil L2 other end respectively.
Chip U1 model is UC3844.
The model of one-way SCR VS is TL431.
Compared with prior art, the beneficial effects of the utility model are: the voltage that the utility model LED drive circuit utilizes the intrinsic reference voltage source of chip U1 to provide and TL431 form structure input LED drive circuit simple, with low cost, withstand voltage relatively low switching tube can be selected, both guaranteed safely, reduce costs, turn reduce loss, stability is high.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of LED drive circuit.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, in the utility model embodiment, a kind of LED drive circuit, comprise rectifier bridge Q, chip U1, transformer T, triode VT1 and one-way SCR VS, rectifier bridge Q pin 1 is connected 220V alternating current two ends respectively with rectifier bridge Q pin 2, rectifier bridge Q pin 3 connects electric capacity C5 respectively, resistance R2, the K pole of one-way SCR VS, electric capacity C2, chip U1 pin 5, electric capacity C4 and resistance R9, the G pole of resistance R2 other end difference contact resistance R1 and one-way SCR VS, the resistance R1 other end connects rectifier bridge Q pin 4 respectively, the electric capacity C5 other end, resistance R10, electric capacity C7 and transformer T coil L1, the resistance R10 other end connects ground capacity C1 respectively, diode D1 negative pole and chip U1 pin 7, diode D2 positive pole connects grounded inductor L3, chip U1 pin 1 connects chip U1 pin 2 by electric capacity C3, chip U1 pin 8 is connecting triode VT1 emitter and resistance R3 respectively, the resistance R3 other end is contact resistance R4 and triode VT1 base stage respectively, the resistance R4 other end connects the A pole of one-way SCR VS, triode VT1 collector electrode contact resistance R5, the resistance R5 other end connects chip U1 pin 3 respectively, resistance R8 and the electric capacity C4 other end, the S pole of the resistance R8 other end difference contact resistance R9 other end and metal-oxide-semiconductor VR, the G pole of metal-oxide-semiconductor VR connects chip U1 pin 6 by resistance R7, D pole contact resistance R11 and the transformer T coil L1 other end respectively of metal-oxide-semiconductor VR, transformer T coil L2 one end contact resistance R6, the resistance R6 other end connects electric capacity C6 and resistance R12 respectively, the resistance R12 other end connects LED, the LED other end connects the electric capacity C6 other end and the transformer T coil L2 other end respectively.
Chip U1 model is UC3844.
The model of one-way SCR VS is TL431.
Operation principle of the present utility model is: refer to Fig. 1, the element composition LED drive power overvoltage crowbars such as chip U1 and triode VT1, when input voltage exceedes set point, triode VT1 conducting will make the voltage of chip U1 pin 3 more than 1V, output driving pulse is blocked, metal-oxide-semiconductor VR is turned off, the voltage that metal-oxide-semiconductor VR is born is only input voltage, metal-oxide-semiconductor VR is protected, the direct voltage that the electric current flowing through metal-oxide-semiconductor VR is set up on sample resistance R9 is input to chip U1 pin 3, can limit metal-oxide-semiconductor VR peak current, thus realize output overcurrent or short-circuit protection, chip U1 is well protected, improve the stability of LED drive circuit.
Claims (3)
1. a LED drive circuit, comprise rectifier bridge Q, chip U1, transformer T, triode VT1 and one-way SCR VS, it is characterized in that, described rectifier bridge Q pin 1 is connected 220V alternating current two ends respectively with rectifier bridge Q pin 2, rectifier bridge Q pin 3 connects electric capacity C5 respectively, resistance R2, the K pole of one-way SCR VS, electric capacity C2, chip U1 pin 5, electric capacity C4 and resistance R9, the G pole of resistance R2 other end difference contact resistance R1 and one-way SCR VS, the resistance R1 other end connects rectifier bridge Q pin 4 respectively, the electric capacity C5 other end, resistance R10, electric capacity C7 and transformer T coil L1, the resistance R10 other end connects ground capacity C1 respectively, diode D1 negative pole and chip U1 pin 7, diode D2 positive pole connects grounded inductor L3, chip U1 pin 1 connects chip U1 pin 2 by electric capacity C3, chip U1 pin 8 is connecting triode VT1 emitter and resistance R3 respectively, the resistance R3 other end is contact resistance R4 and triode VT1 base stage respectively, the resistance R4 other end connects the A pole of one-way SCR VS, triode VT1 collector electrode contact resistance R5, the resistance R5 other end connects chip U1 pin 3 respectively, resistance R8 and the electric capacity C4 other end, the S pole of the resistance R8 other end difference contact resistance R9 other end and metal-oxide-semiconductor VR, the G pole of metal-oxide-semiconductor VR connects chip U1 pin 6 by resistance R7, D pole contact resistance R11 and the transformer T coil L1 other end respectively of metal-oxide-semiconductor VR, transformer T coil L2 one end contact resistance R6, the resistance R6 other end connects electric capacity C6 and resistance R12 respectively, the resistance R12 other end connects LED, the LED other end connects the electric capacity C6 other end and the transformer T coil L2 other end respectively.
2. LED drive circuit according to claim 1, is characterized in that, described chip U1 model is UC3844.
3. LED drive circuit according to claim 1, is characterized in that, the model of described one-way SCR VS is TL431.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520257603.XU CN204578843U (en) | 2015-04-27 | 2015-04-27 | A kind of LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520257603.XU CN204578843U (en) | 2015-04-27 | 2015-04-27 | A kind of LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204578843U true CN204578843U (en) | 2015-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520257603.XU Expired - Fee Related CN204578843U (en) | 2015-04-27 | 2015-04-27 | A kind of LED drive circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN204578843U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106369349A (en) * | 2016-10-28 | 2017-02-01 | 桂林大创科技有限公司 | LED lamp capable of dissipating heat automatically and driving circuit of LED lamp |
| CN113709930A (en) * | 2021-07-27 | 2021-11-26 | 江苏威尔曼科技有限公司 | Novel large-size arrival lamp control system |
-
2015
- 2015-04-27 CN CN201520257603.XU patent/CN204578843U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106369349A (en) * | 2016-10-28 | 2017-02-01 | 桂林大创科技有限公司 | LED lamp capable of dissipating heat automatically and driving circuit of LED lamp |
| CN113709930A (en) * | 2021-07-27 | 2021-11-26 | 江苏威尔曼科技有限公司 | Novel large-size arrival lamp control system |
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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: 20150819 Termination date: 20180427 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |