CN204145857U - A kind of LED drive circuit - Google Patents
A kind of LED drive circuit Download PDFInfo
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- CN204145857U CN204145857U CN201420671149.8U CN201420671149U CN204145857U CN 204145857 U CN204145857 U CN 204145857U CN 201420671149 U CN201420671149 U CN 201420671149U CN 204145857 U CN204145857 U CN 204145857U
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Abstract
The utility model discloses a kind of LED drive circuit, comprise chip U1, chip U2, photoelectrical coupler U3, transformer T and fuse FU.The utility model LED drive circuit adopts photoelectrical coupler that high-tension electricity district and low voltage control district are carried out Phototube Coupling, be different from the constant-current driving power supply that HF switch IC controls, the current fluctuation of fixable back clamping voltage to LED detects automatically, feedback or correction, by the efficient constant current of chip U2 stable output, whole power driving circuit working stability is reliable, do not produce HF switch concussion, do not produce electromagnetic radiation and High-frequency Interference, there is no vibrating noise, anti-ripple, interference resistance is strong, electric energy efficiency reaches more than 90% and also has antioverloading, the advantages such as anti-overshoot protection.
Description
Technical field
The utility model relates to a kind of drive circuit, specifically a kind of LED drive circuit.
Background technology
LED is the semiconductor device that a kind of constant current drives, and compares, have the plurality of advantages such as efficiency is high, volume is little, brightness is high relative to traditional light sources such as incandescent lamps.So LED illumination progressively replaces traditional lighting system, but due to the diode characteristic of LED, when forward conduction, flow through electric current and its positive pressure drop exponentially relation of LED, compared to traditional lighting system, LED illumination needs extra drive circuit.
Existing LED power drive circuit controls constant-current drive circuit with HF switch IC usually, this power driving circuit job stability is not high, produce HF switch concussion, electromagnetic radiation and High-frequency Interference etc., also have vibrating noise, interference resistance strong, utilization rate of electrical is not high below 80%, and waste electric energy does not utilize environmental protection.Also anti-lightning strike not, there is no the shortcoming such as antioverloading, overshoot protection, with the constant-current supply driving LED lamp of this circuit production, working stability, there is no noise, not flicker or the vibrations of other light, without high frequency radiation and special power saving.
Utility model content
The purpose of this utility model is to provide a kind of good operating stability, reduces the LED drive circuit of electromagnetic radiation, low noise, increase utilization rate of electrical, 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 chip U1, chip U2, photoelectrical coupler U3, transformer T and fuse FU, described fuse FU one end connects 220V alternating current, fuse FU other end contact resistance R1, the resistance R1 other end connects electric capacity C1 and transformer T coil L1 respectively, the electric capacity C1 other end connects the 220V alternating current other end and transformer T coil L2 respectively, transformer coil L1 and the transformer coil L2 other end are connected respectively rectifier bridge Q pin 1 and rectifier bridge Q pin 3, rectifier bridge Q pin 2 connects electric capacity C2 and resistance R9 respectively, the resistance R9 other end is contact resistance R10 respectively, electric capacity C3, resistance R11 and transformer T1 coil L3, the transformer T2 coil L3 other end connects diode D1 positive pole and chip U1 pin DRAIN respectively, diode D1 negative pole connects the electric capacity C3 other end and the resistance R11 other end respectively, the described resistance R10 other end connects ground capacity C5 respectively, diode D2 negative pole, chip U1 pin VDD and photoelectrical coupler U3 pin 3, photoelectrical coupler U3 pin 1 connects power supply VCC, photoelectrical coupler U3 pin 2 contact resistance R2, photoelectrical coupler U3 pin 4 connects ground capacity C4 and chip U1 pin FB respectively, chip U1 pin SOUROE connects rectifier bridge Q pin 4 and transformer T3 coil L5 and ground connection respectively, the transformer T3 coil L5 other end connects diode D2 positive pole, described transformer T2 coil L4 connects diode D3 positive pole, diode D3 negative pole connects electric capacity C6 respectively, resistance R12, electric capacity C7 and LED group G, LED group G is contact resistance R8 respectively, the electric capacity C7 other end and resistance R14, the resistance R14 other end is the connection transformer T2 coil L4 other end respectively, the electric capacity C6 other end and resistance R13 ground connection, the resistance R13 other end is the contact resistance R12 other end respectively, resistance R4 and chip U2 pin 4, the resistance R4 other end connects electric capacity C9, the electric capacity C9 other end is the contact resistance R2 other end and resistance R3 respectively, the resistance R3 other end connects electric capacity C10 and chip U2 pin 7 respectively, electric capacity C10 other end contact resistance R5, the resistance R5 other end is the contact resistance R8 other end and chip U2 pin 2 respectively, chip U2 pin 8 connects power supply VCC respectively, diode D4 negative pole and electric capacity C8, electric capacity C8 other end connection transformer T3 coil L6, the transformer T3 coil L6 other end connects diode D4 positive pole, described chip U2 pin 1 connects chip U2 pin 5 and resistance R7 respectively, the resistance R7 other end connects chip U2 pin 3 and resistance R6 respectively, the resistance R6 other end connects chip U2 pin 6 and ground connection.
As further program of the utility model: described chip U1 is smart power switch adjuster VIPER22A.
As further program of the utility model: described chip U2 is dual comparator TSMLL011.
As the utility model further scheme: described photoelectrical coupler U3 model is PC817A.
Compared with prior art, the beneficial effects of the utility model are: the utility model LED drive circuit adopts photoelectrical coupler that high-tension electricity district and low voltage control district are carried out Phototube Coupling, be different from the constant-current driving power supply that HF switch IC controls, the current fluctuation of fixable back clamping voltage to LED detects automatically, feedback or correction, by the efficient constant current of chip U2 stable output, whole power driving circuit working stability is reliable, do not produce HF switch concussion, do not produce electromagnetic radiation and High-frequency Interference, there is no vibrating noise, anti-ripple, interference resistance is strong, electric energy efficiency reaches more than 90% and also has antioverloading, the advantages such as anti-overshoot protection.
Accompanying drawing explanation
Fig. 1 is a kind of 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 chip U1, chip U2, photoelectrical coupler U3, transformer T and fuse FU, fuse FU one end connects 220V alternating current, fuse FU other end contact resistance R1, the resistance R1 other end connects electric capacity C1 and transformer T coil L1 respectively, the electric capacity C1 other end connects the 220V alternating current other end and transformer T coil L2 respectively, transformer coil L1 and the transformer coil L2 other end are connected respectively rectifier bridge Q pin 1 and rectifier bridge Q pin 3, rectifier bridge Q pin 2 connects electric capacity C2 and resistance R9 respectively, the resistance R9 other end is contact resistance R10 respectively, electric capacity C3, resistance R11 and transformer T1 coil L3, the transformer T2 coil L3 other end connects diode D1 positive pole and chip U1 pin DRAIN respectively, diode D1 negative pole connects the electric capacity C3 other end and the resistance R11 other end respectively, the resistance R10 other end connects ground capacity C5 respectively, diode D2 negative pole, chip U1 pin VDD and photoelectrical coupler U3 pin 3, photoelectrical coupler U3 pin 1 connects power supply VCC, photoelectrical coupler U3 pin 2 contact resistance R2, photoelectrical coupler U3 pin 4 connects ground capacity C4 and chip U1 pin FB respectively, chip U1 pin SOUROE connects rectifier bridge Q pin 4 and transformer T3 coil L5 and ground connection respectively, the transformer T3 coil L5 other end connects diode D2 positive pole, transformer T2 coil L4 connects diode D3 positive pole, diode D3 negative pole connects electric capacity C6 respectively, resistance R12, electric capacity C7 and LED group G, LED group G is contact resistance R8 respectively, the electric capacity C7 other end and resistance R14, the resistance R14 other end is the connection transformer T2 coil L4 other end respectively, the electric capacity C6 other end and resistance R13 ground connection, the resistance R13 other end is the contact resistance R12 other end respectively, resistance R4 and chip U2 pin 4, the resistance R4 other end connects electric capacity C9, the electric capacity C9 other end is the contact resistance R2 other end and resistance R3 respectively, the resistance R3 other end connects electric capacity C10 and chip U2 pin 7 respectively, electric capacity C10 other end contact resistance R5, the resistance R5 other end is the contact resistance R8 other end and chip U2 pin 2 respectively, chip U2 pin 8 connects power supply VCC respectively, diode D4 negative pole and electric capacity C8, electric capacity C8 other end connection transformer T3 coil L6, the transformer T3 coil L6 other end connects diode D4 positive pole, chip U2 pin 1 connects chip U2 pin 5 and resistance R7 respectively, the resistance R7 other end connects chip U2 pin 3 and resistance R6 respectively, the resistance R6 other end connects chip U2 pin 6 and ground connection.
Chip U1 is smart power switch adjuster VIPER22A.
Chip U2 is dual comparator TSMLL011.
Photoelectrical coupler U3 model is PC817A.
Chip U1 is the smart power switch adjuster integrating pwm control circuit and power MOSFET, chip U2 is the TSMLL011 of built-in 2.5V reference voltage and dual comparator, resistance R6 is sample resistance, current comparator etc. in it and chip U2 forms current control loop, resitstance voltage divider R4, voltage comparator etc. in R5 and chip U2, composition voltage control loop, feedback is realized by photoelectrical coupler U1, high-tension electricity district and low voltage control district are carried out Phototube Coupling, the current fluctuation of fixable back clamping voltage to LED detects automatically, feedback or correction, by the efficient constant current of chip U2 stable output, whole power driving circuit working stability is reliable, do not produce HF switch concussion, do not produce electromagnetic radiation and High-frequency Interference, there is no vibrating noise, anti-ripple, interference resistance is strong, electric energy efficiency reaches more than 90% and also has antioverloading, the advantages such as anti-overshoot protection.
Claims (4)
1. a LED drive circuit, comprise chip U1, chip U2, photoelectrical coupler U3, transformer T and fuse FU, it is characterized in that, described fuse FU one end connects 220V alternating current, fuse FU other end contact resistance R1, the resistance R1 other end connects electric capacity C1 and transformer T coil L1 respectively, the electric capacity C1 other end connects the 220V alternating current other end and transformer T coil L2 respectively, transformer coil L1 and the transformer coil L2 other end are connected respectively rectifier bridge Q pin 1 and rectifier bridge Q pin 3, rectifier bridge Q pin 2 connects electric capacity C2 and resistance R9 respectively, the resistance R9 other end is contact resistance R10 respectively, electric capacity C3, resistance R11 and transformer T1 coil L3, the transformer T2 coil L3 other end connects diode D1 positive pole and chip U1 pin DRAIN respectively, diode D1 negative pole connects the electric capacity C3 other end and the resistance R11 other end respectively, the described resistance R10 other end connects ground capacity C5 respectively, diode D2 negative pole, chip U1 pin VDD and photoelectrical coupler U3 pin 3, photoelectrical coupler U3 pin 1 connects power supply VCC, photoelectrical coupler U3 pin 2 contact resistance R2, photoelectrical coupler U3 pin 4 connects ground capacity C4 and chip U1 pin FB respectively, chip U1 pin SOUROE connects rectifier bridge Q pin 4 and transformer T3 coil L5 and ground connection respectively, the transformer T3 coil L5 other end connects diode D2 positive pole, described transformer T2 coil L4 connects diode D3 positive pole, diode D3 negative pole connects electric capacity C6 respectively, resistance R12, electric capacity C7 and LED group G, LED group G is contact resistance R8 respectively, the electric capacity C7 other end and resistance R14, the resistance R14 other end is the connection transformer T2 coil L4 other end respectively, the electric capacity C6 other end and resistance R13 ground connection, the resistance R13 other end is the contact resistance R12 other end respectively, resistance R4 and chip U2 pin 4, the resistance R4 other end connects electric capacity C9, the electric capacity C9 other end is the contact resistance R2 other end and resistance R3 respectively, the resistance R3 other end connects electric capacity C10 and chip U2 pin 7 respectively, electric capacity C10 other end contact resistance R5, the resistance R5 other end is the contact resistance R8 other end and chip U2 pin 2 respectively, chip U2 pin 8 connects power supply VCC respectively, diode D4 negative pole and electric capacity C8, electric capacity C8 other end connection transformer T3 coil L6, the transformer T3 coil L6 other end connects diode D4 positive pole, described chip U2 pin 1 connects chip U2 pin 5 and resistance R7 respectively, the resistance R7 other end connects chip U2 pin 3 and resistance R6 respectively, the resistance R6 other end connects chip U2 pin 6 and ground connection.
2. LED drive circuit according to claim 1, is characterized in that, described chip U1 is smart power switch adjuster VIPER22A.
3. LED drive circuit according to claim 1, is characterized in that, described chip U2 is dual comparator TSMLL011.
4. LED drive circuit according to claim 1, is characterized in that, described photoelectrical coupler U3 model is PC817A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420671149.8U CN204145857U (en) | 2014-11-12 | 2014-11-12 | A kind of LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420671149.8U CN204145857U (en) | 2014-11-12 | 2014-11-12 | A kind of LED drive circuit |
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| Publication Number | Publication Date |
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| CN204145857U true CN204145857U (en) | 2015-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420671149.8U Active CN204145857U (en) | 2014-11-12 | 2014-11-12 | A kind of LED drive circuit |
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| CN (1) | CN204145857U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110971849A (en) * | 2018-09-28 | 2020-04-07 | 强弦科技股份有限公司 | Power supply for liquid crystal television |
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2014
- 2014-11-12 CN CN201420671149.8U patent/CN204145857U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110971849A (en) * | 2018-09-28 | 2020-04-07 | 强弦科技股份有限公司 | Power supply for liquid crystal television |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20151123 Address after: 518000 Shenzhen City, Nanshan District province science and Technology Park, North Road, CLOU Road, building A, block, room 1, room 2, room 10, No. 4 Patentee after: SHENZHEN HAIPAITE PHOTOVOLTAIC TECHNOLOGY CO., LTD. Address before: 518000, Shenzhen, Guangming District, Guangdong, Gongming street, Chang Zhen community, Changxin science and Technology Industrial Park, 10, third floor, East Patentee before: SHENZHEN NUODE OPTOELECTRONIC TECHNOLOGY CO., LTD. |