CN204859653U - LED drive circuit - Google Patents
LED drive circuit Download PDFInfo
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- CN204859653U CN204859653U CN201520550549.8U CN201520550549U CN204859653U CN 204859653 U CN204859653 U CN 204859653U CN 201520550549 U CN201520550549 U CN 201520550549U CN 204859653 U CN204859653 U CN 204859653U
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Abstract
The utility model discloses a LED drive circuit, including diode D1, diode D2, triode Q1, controllable accurate steady voltage source VS1, controllable accurate steady voltage source VS2 and electric capacity C1, the anodal 220V alternating current one end of connecting of diode D2, diode D3 negative pole is connected respectively to diode D2 negative pole, electric capacity C1 and triode Q1 projecting pole, triode Q1 base is connecting resistance R1 and resistance R2 respectively, controllable accurate steady voltage source VS1's the K utmost point is connected respectively to the resistance R2 other end, controllable accurate steady voltage source VS1's A extremely connects diode D1 positive pole, controllable accurate steady voltage source VS1's R extremely distinguishes connecting resistance R4 and electric capacity C3. The utility model provides a be a high accuracy, output voltage is adjustable, output easily adjusts LED drive circuit, input output voltage adjustable range is wide, circuit output precision is good, conversion efficiency is high, adopts electronic component few, gives out heat for a short time, has very big price advantage, circuit structure is simple, and is small, with low costs, especially adapted using widely.
Description
Technical field
The utility model relates to a kind of LED, specifically a kind of LED drive circuit.
Background technology
More existing Dimmable LED drive circuits, dimming scope is little, and circuit structure is simple, and mostly uses special light modulation chip, and antijamming capability is low, and cost is higher, and volume is large.
Utility model content
The purpose of this utility model is to provide a kind of LED drive circuit, 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, comprises diode D1, diode D2, triode Q1, controllable accurate source of stable pressure VS1, controllable accurate source of stable pressure VS2 and electric capacity C1, described diode D2 positive pole connects 220V alternating current one end, and diode D2 negative pole connects diode D3 negative pole respectively, electric capacity C1 and triode Q1 emitter, triode Q1 base stage is contact resistance R1 and resistance R2 respectively, the resistance R2 other end connects the K pole of controllable accurate source of stable pressure VS1 respectively, the A pole of controllable accurate source of stable pressure VS1 connects diode D1 positive pole, the R pole contact resistance R4 and electric capacity C3 respectively of controllable accurate source of stable pressure VS1, the K pole of resistance R4 other end difference contact resistance R3 and controllable accurate source of stable pressure VS2, the resistance R3 other end contact resistance R1 other end, the R pole contact resistance R5 respectively of controllable accurate source of stable pressure VS2, electric capacity C4 and resistance R6, the resistance R5 other end is connecting triode Q1 collector electrode respectively, electric capacity C2 and LED+, the electric capacity C2 other end is connecting luminous diode LED-respectively, the resistance R6 other end, the electric capacity C4 other end, the A pole of controllable accurate source of stable pressure VS2, the electric capacity C3 other end, diode D1 negative pole, the electric capacity C1 other end, diode D3 positive pole and the 220V alternating current other end.
As further program of the utility model: described diode D3 is voltage stabilizing didoe.
As the utility model further scheme: described controllable accurate source of stable pressure VS1 and VS2 all adopts TL431.
Compared with prior art, the beneficial effects of the utility model are: the LED drive circuit that provided by the utility model is a kind of high accuracy, output voltage is adjustable, power output easily regulates, and input and output voltage adjustable range is wide, and circuit output accuracy is good, conversion efficiency is high, employing electronic component is few, and caloric value is little, has very large price advantage, circuit structure is simple, volume is little, and cost is low, is applicable to very much promoting the use of.
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, comprises diode D1, diode D2, triode Q1, controllable accurate source of stable pressure VS1, controllable accurate source of stable pressure VS2 and electric capacity C1, diode D2 positive pole connects 220V alternating current one end, and diode D2 negative pole connects diode D3 negative pole respectively, electric capacity C1 and triode Q1 emitter, triode Q1 base stage is contact resistance R1 and resistance R2 respectively, the resistance R2 other end connects the K pole of controllable accurate source of stable pressure VS1 respectively, the A pole of controllable accurate source of stable pressure VS1 connects diode D1 positive pole, the R pole contact resistance R4 and electric capacity C3 respectively of controllable accurate source of stable pressure VS1, the K pole of resistance R4 other end difference contact resistance R3 and controllable accurate source of stable pressure VS2, the resistance R3 other end contact resistance R1 other end, the R pole contact resistance R5 respectively of controllable accurate source of stable pressure VS2, electric capacity C4 and resistance R6, the resistance R5 other end is connecting triode Q1 collector electrode respectively, electric capacity C2 and LED+, the electric capacity C2 other end is connecting luminous diode LED-respectively, the resistance R6 other end, the electric capacity C4 other end, the A pole of controllable accurate source of stable pressure VS2, the electric capacity C3 other end, diode D1 negative pole, the electric capacity C1 other end, diode D3 positive pole and the 220V alternating current other end.
Diode D3 is voltage stabilizing didoe.
Controllable accurate source of stable pressure VS1 and VS2 all adopts TL431.
Operation principle of the present utility model is: refer to Fig. 1, 220V alternating current is after diode D2 halfwave rectifier, the effect of electric capacity C1 is used to carry out energy storage and filtering to input voltage, diode D3 is used for device pressure stabilization function, the effect of electric capacity C2 carries out energy storage and filtering to output voltage, the effect of electric capacity C3 is to the input reference voltage filtering of VS1, the effect of electric capacity C4 is to the input reference voltage filtering of VS2, the effect of diode D1 is the reference voltage raising VS1, to strengthen when the negative electrode of VS2 is for voltage difference during low level, make performance more reliable and more stable, VS2 and R5 in circuit, R6 together constitutes an equivalent voltage stabilizing didoe, change resistance R5, the value of R6 gets final product the value of regulation output end Vo voltage.
When output end vo voltage increases, when making the sampling voltage at resistance R5, R6 connected node place be greater than reference voltage, the negative electrode of VS2 is low level, now, the reference voltage terminal of VS1 is also low level, be less than the absolute reference voltage of VS1 inside, now, the negative electrode of VS1 is off state, and the base stage of triode Q1 can not have electric current due to the disconnection of VS1, now, the collector and emitter cut-off of triode Q1, input voltage and output end vo voltage disconnect, and the voltage of output end vo only maintains by the energy storage in electric capacity C2, therefore will decline.
When sampling voltage is less than reference voltage, the negative electrode of VS2 is off state, and now, the reference voltage terminal of VS1 is connected with input voltage by resistance R3, R4, and when input voltage is greater than the absolute reference voltage of VS1, the negative electrode of VS1 is low level.Now, the base current of Q1 can be produced by input voltage and R2, triode Q1 conducting, and is tending towards saturation condition, and when saturation condition, the collector and emitter pressure drop of triode Q1 is less, and power consumption is less.Now, input voltage is conducting to output end vo by triode Q1.
So constantly repeatedly, output voltage is made to keep stable.
To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any Reference numeral in claim should be considered as the claim involved by limiting.
In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.
Claims (3)
1. a LED drive circuit, comprises diode D1, diode D2, triode Q1, controllable accurate source of stable pressure VS1, controllable accurate source of stable pressure VS2 and electric capacity C1, is characterized in that, described diode D2 positive pole connects 220V alternating current one end, and diode D2 negative pole connects diode D3 negative pole respectively, electric capacity C1 and triode Q1 emitter, triode Q1 base stage is contact resistance R1 and resistance R2 respectively, the resistance R2 other end connects the K pole of controllable accurate source of stable pressure VS1 respectively, the A pole of controllable accurate source of stable pressure VS1 connects diode D1 positive pole, the R pole contact resistance R4 and electric capacity C3 respectively of controllable accurate source of stable pressure VS1, the K pole of resistance R4 other end difference contact resistance R3 and controllable accurate source of stable pressure VS2, the resistance R3 other end contact resistance R1 other end, the R pole contact resistance R5 respectively of controllable accurate source of stable pressure VS2, electric capacity C4 and resistance R6, the resistance R5 other end is connecting triode Q1 collector electrode respectively, electric capacity C2 and LED+, the electric capacity C2 other end is connecting luminous diode LED-respectively, the resistance R6 other end, the electric capacity C4 other end, the A pole of controllable accurate source of stable pressure VS2, the electric capacity C3 other end, diode D1 negative pole, the electric capacity C1 other end, diode D3 positive pole and the 220V alternating current other end.
2. LED drive circuit according to claim 1, is characterized in that, described diode D3 is voltage stabilizing didoe.
3. LED drive circuit according to claim 1, is characterized in that, described controllable accurate source of stable pressure VS1 and VS2 all adopts TL431.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520550549.8U CN204859653U (en) | 2015-07-24 | 2015-07-24 | LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520550549.8U CN204859653U (en) | 2015-07-24 | 2015-07-24 | LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204859653U true CN204859653U (en) | 2015-12-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520550549.8U Expired - Fee Related CN204859653U (en) | 2015-07-24 | 2015-07-24 | LED drive circuit |
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| Country | Link |
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| CN (1) | CN204859653U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160524A (en) * | 2016-07-14 | 2016-11-23 | 成都市思卡利科技有限公司 | Bridge rectifier mu balanced circuit based on the design of controllable accurate source of stable pressure |
| CN107587970A (en) * | 2017-08-16 | 2018-01-16 | 海南大学 | A kind of wave energy generating set and its circuit |
| CN117460123A (en) * | 2023-12-26 | 2024-01-26 | 深圳莱福德科技股份有限公司 | Method for preventing no-load runaway of LED driving power supply |
-
2015
- 2015-07-24 CN CN201520550549.8U patent/CN204859653U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160524A (en) * | 2016-07-14 | 2016-11-23 | 成都市思卡利科技有限公司 | Bridge rectifier mu balanced circuit based on the design of controllable accurate source of stable pressure |
| CN107587970A (en) * | 2017-08-16 | 2018-01-16 | 海南大学 | A kind of wave energy generating set and its circuit |
| CN117460123A (en) * | 2023-12-26 | 2024-01-26 | 深圳莱福德科技股份有限公司 | Method for preventing no-load runaway of LED driving power supply |
| CN117460123B (en) * | 2023-12-26 | 2024-03-15 | 深圳莱福德科技股份有限公司 | Method for preventing no-load runaway of LED driving power supply |
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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: 20151209 Termination date: 20160724 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |