CN204168566U - A kind of LED drive circuit - Google Patents
A kind of LED drive circuit Download PDFInfo
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- CN204168566U CN204168566U CN201420692149.6U CN201420692149U CN204168566U CN 204168566 U CN204168566 U CN 204168566U CN 201420692149 U CN201420692149 U CN 201420692149U CN 204168566 U CN204168566 U CN 204168566U
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Abstract
The utility model discloses a kind of LED drive circuit, comprise rectifier bridge Q, inductance L 1, photoelectrical coupler U1, chip U2 and transformer T.The utility model carries out PWM control by using chip U2 to whole circuit, coordinates external circuit, can carry out accurate adjustment, and power factor is high to the operating voltage of LED and electric current, has played LED power saving, efficiently performance as much as possible, has decreased failure rate.
Description
Technical field
The utility model relates to a kind of drive circuit, specifically a kind of LED drive circuit.
Background technology
LED has the advantages such as environmental protection, energy-conservation, the life-span is long and is regarded as 21 century lighting source, has now started to replace conventional light source and has widely applied on various lighting.But, because LED self character determines that its driving power can not adopt same power supply with ordinary incandescent lamp, in order to avoid voltage fluctuation causes electric current increase thus damaged by LED, thus LED work is required drives requirement fully to meet must to design new power supply, thus play the performance of LED to greatest extent, reduce failure rate, existing LED Driving technique is of a great variety, each has something to recommend him.
Utility model content
The purpose of this utility model is to provide that a kind of circuit structure is simple, the off-line type LED drive circuit of function-stable, 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, inductance L 1, photoelectrical coupler U1, chip U2 and transformer T, described inductance L 1 one end connects 220V alternating current, inductance L 1 other end is contact resistance R1 and rectifier bridge Q pin 1 respectively, the resistance R1 other end connects the 220V alternating current other end and rectifier bridge Q pin 4 respectively, rectifier bridge Q pin 3 ground connection, rectifier bridge Q pin 2 connects inductance L 2 respectively, resistance R2 and ground capacity C1, inductance L 2 other end is the contact resistance R2 other end respectively, ground capacity C2, resistance R3, electric capacity C3, resistance R4 and transformer T coil L3, the transformer T coil L3 other end is connection transformer T coil L5 respectively, diode D2 positive pole and resistance R14, the transformer T coil L5 other end connects electric capacity C6 and ground connection, the electric capacity C6 other end connects diode D2 negative pole respectively, the resistance R3 other end and chip U2 pin 5, the described resistance R14 other end connects the D pole of diode D1 positive pole and metal-oxide-semiconductor VT1 respectively, diode D1 negative pole connects the electric capacity C3 other end and the resistance R4 other end respectively, the S pole contact resistance R10 respectively of described metal-oxide-semiconductor VT1, resistance R11 and chip U2 pin 4, the resistance R10 other end contact resistance R11 other end ground connection, the G pole of described metal-oxide-semiconductor VT1 connects chip U2 pin 6 by resistance R12, chip U2 pin 3 connects earth resistance R13, chip U2 pin 1 ground connection, chip U2 pin 2 connects photoelectrical coupler U1 pin 1, photoelectrical coupler U1 pin 4 ground connection, photoelectrical coupler U1 pin 3 is contact resistance R7 respectively, resistance R8 and earth resistance R9, the resistance R8 other end is contact resistance R6 respectively, the resistance R7 other end and LED-, described photoelectrical coupler U1 pin 2 is the contact resistance R6 other end and resistance R5 respectively, the resistance R5 other end connects diode D4 positive pole, diode D4 negative pole connects diode D3 negative pole respectively, ground capacity C5 and LED+, diode D3 positive pole connection transformer T coil L4, the transformer T coil L4 other end connects ground capacity C4.
As further program of the utility model: described photoelectrical coupler U1 model is TLP521, described chip U2 model is PT4204.
As further program of the utility model: described diode D1, resistance R4 and electric capacity C3 form RCD peak absorbing circuit.
As the utility model further scheme: described resistance R6, resistance R7 and resistance R8 are LED current-limiting resistance.
Compared with prior art, the beneficial effects of the utility model are: the utility model carries out PWM control by using chip U2 to whole circuit, coordinate external circuit, accurate adjustment can be carried out to the operating voltage of LED and electric current, and power factor is high, play LED power saving, efficiently performance as much as possible, decrease failure rate.
Accompanying drawing explanation
Fig. 1 is the structural representation 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, inductance L 1, photoelectrical coupler U1, chip U2 and transformer T, inductance L 1 one end connects 220V alternating current, inductance L 1 other end is contact resistance R1 and rectifier bridge Q pin 1 respectively, the resistance R1 other end connects the 220V alternating current other end and rectifier bridge Q pin 4 respectively, rectifier bridge Q pin 3 ground connection, rectifier bridge Q pin 2 connects inductance L 2 respectively, resistance R2 and ground capacity C1, inductance L 2 other end is the contact resistance R2 other end respectively, ground capacity C2, resistance R3, electric capacity C3, resistance R4 and transformer T coil L3, the transformer T coil L3 other end is connection transformer T coil L5 respectively, diode D2 positive pole and resistance R14, the transformer T coil L5 other end connects electric capacity C6 and ground connection, the electric capacity C6 other end connects diode D2 negative pole respectively, the resistance R3 other end and chip U2 pin 5, the resistance R14 other end connects the D pole of diode D1 positive pole and metal-oxide-semiconductor VT1 respectively, diode D1 negative pole connects the electric capacity C3 other end and the resistance R4 other end respectively, the S pole contact resistance R10 respectively of metal-oxide-semiconductor VT1, resistance R11 and chip U2 pin 4, the resistance R10 other end contact resistance R11 other end ground connection, the G pole of metal-oxide-semiconductor VT1 connects chip U2 pin 6 by resistance R12, chip U2 pin 3 connects earth resistance R13, chip U2 pin 1 ground connection, chip U2 pin 2 connects photoelectrical coupler U1 pin 1, photoelectrical coupler U1 pin 4 ground connection, photoelectrical coupler U1 pin 3 is contact resistance R7 respectively, resistance R8 and earth resistance R9, the resistance R8 other end is contact resistance R6 respectively, the resistance R7 other end and LED-, photoelectrical coupler U1 pin 2 is the contact resistance R6 other end and resistance R5 respectively, the resistance R5 other end connects diode D4 positive pole, diode D4 negative pole connects diode D3 negative pole respectively, ground capacity C5 and LED+, diode D3 positive pole connection transformer T coil L4, the transformer T coil L4 other end connects ground capacity C4.
Photoelectrical coupler U1 model is TLP521, and chip U2 model is PT4204.
Diode D1, resistance R4 and electric capacity C3 form RCD peak absorbing circuit.
Resistance R6, resistance R7 and resistance R8 are LED current-limiting resistance.
Operation principle of the present utility model is: in the utility model circuit, inductance L 1 plays jamproof effect, resistance R1 is anti-lightning strike, 220V AC signal is through rectifier bridge Q rectification, after inductance L 2 and electric capacity C1 filtering, a part provides starting resistor for chip U2, another part is via diode D1, the RCD peak absorbing circuit that resistance R4 and electric capacity C3 forms is chip U2 auxiliary power supply, resistance R13 resistance size can regulate the PWM output frequency of chip U1, resistance R10 and resistance R11 is current sample module, diode D2 and electric capacity C6 also plays the effect of rectification, transformer T adopts inverse-excitation type, signal is through diode D3 rectification, after diode D4 voltage stabilizing, again through resistance R6, resistance R7 and resistance R8 exports to LED after LED current limliting.
Described LED most preferably is 7W, and now the utility model can ensure to carry out accurate adjustment to the operating voltage of LED and electric current, and power factor is high, has played LED power saving, efficiently performance as much as possible, has decreased failure rate.
Claims (4)
1. a LED drive circuit, comprise rectifier bridge Q, inductance L 1, photoelectrical coupler U1, chip U2 and transformer T, it is characterized in that, described inductance L 1 one end connects 220V alternating current, inductance L 1 other end is contact resistance R1 and rectifier bridge Q pin 1 respectively, the resistance R1 other end connects the 220V alternating current other end and rectifier bridge Q pin 4 respectively, rectifier bridge Q pin 3 ground connection, rectifier bridge Q pin 2 connects inductance L 2 respectively, resistance R2 and ground capacity C1, inductance L 2 other end is the contact resistance R2 other end respectively, ground capacity C2, resistance R3, electric capacity C3, resistance R4 and transformer T coil L3, the transformer T coil L3 other end is connection transformer T coil L5 respectively, diode D2 positive pole and resistance R14, the transformer T coil L5 other end connects electric capacity C6 and ground connection, the electric capacity C6 other end connects diode D2 negative pole respectively, the resistance R3 other end and chip U2 pin 5, the described resistance R14 other end connects the D pole of diode D1 positive pole and metal-oxide-semiconductor VT1 respectively, diode D1 negative pole connects the electric capacity C3 other end and the resistance R4 other end respectively, the S pole contact resistance R10 respectively of described metal-oxide-semiconductor VT1, resistance R11 and chip U2 pin 4, the resistance R10 other end contact resistance R11 other end ground connection, the G pole of described metal-oxide-semiconductor VT1 connects chip U2 pin 6 by resistance R12, chip U2 pin 3 connects earth resistance R13, chip U2 pin 1 ground connection, chip U2 pin 2 connects photoelectrical coupler U1 pin 1, photoelectrical coupler U1 pin 4 ground connection, photoelectrical coupler U1 pin 3 is contact resistance R7 respectively, resistance R8 and earth resistance R9, the resistance R8 other end is contact resistance R6 respectively, the resistance R7 other end and LED-, described photoelectrical coupler U1 pin 2 is the contact resistance R6 other end and resistance R5 respectively, the resistance R5 other end connects diode D4 positive pole, diode D4 negative pole connects diode D3 negative pole respectively, ground capacity C5 and LED+, diode D3 positive pole connection transformer T coil L4, the transformer T coil L4 other end connects ground capacity C4.
2. LED drive circuit according to claim 1, is characterized in that, described photoelectrical coupler U1 model is TLP521, and described chip U2 model is PT4204.
3. LED drive circuit according to claim 1, is characterized in that, described diode D1, resistance R4 and electric capacity C3 form RCD peak absorbing circuit.
4. LED drive circuit according to claim 1, is characterized in that, described resistance R6, resistance R7 and resistance R8 are LED current-limiting resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420692149.6U CN204168566U (en) | 2014-11-17 | 2014-11-17 | A kind of LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420692149.6U CN204168566U (en) | 2014-11-17 | 2014-11-17 | A kind of LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204168566U true CN204168566U (en) | 2015-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420692149.6U Expired - Fee Related CN204168566U (en) | 2014-11-17 | 2014-11-17 | A kind of LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204168566U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108032668A (en) * | 2017-12-28 | 2018-05-15 | 合肥学院 | A kind of draw tool car |
-
2014
- 2014-11-17 CN CN201420692149.6U patent/CN204168566U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108032668A (en) * | 2017-12-28 | 2018-05-15 | 合肥学院 | A kind of draw tool car |
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Legal Events
| Date | Code | Title | Description |
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| 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: 20150218 Termination date: 20171117 |
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| CF01 | Termination of patent right due to non-payment of annual fee |