Constant-voltage drive power supply for white LED on basis of photocoupling feedback circuit

A feedback circuit and photoelectric coupling technology, applied in the field of electronics, can solve the problem of low stability of LED driving power, and achieve the effect of simple LED power supply and stable LED operation.

Inactive Publication Date: 2016-07-20
CHENGDU BAIMIAO NETWORK TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defect of low stability of the traditional LED driving power supply, and provide a constant voltage driving power supply for white LED based on a photoelectric coupling feedback circuit

Method used

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  • Constant-voltage drive power supply for white LED on basis of photocoupling feedback circuit
  • Constant-voltage drive power supply for white LED on basis of photocoupling feedback circuit

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Embodiment

[0018] Such as figure 1 As shown, the constant voltage driving power supply for white light LED of the present invention is mainly composed of a diode rectifier U, a transformer T, a control chip U1, an amplifier P1, a resistor R4, a resistor R3, a resistor R5, a Zener diode D4, an input anti-interference circuit, and a gate Pole drive circuit, photoelectric coupling feedback circuit and constant voltage output circuit.

[0019] When connected, the input anti-interference circuit is connected in series between the positive output terminal of the diode rectifier U and the primary inductance coil L1 of the transformer T. The resistor R3 is connected in series between the negative output terminal of the diode rectifier U and the VCC pin of the control chip U1. The gate drive circuit is connected in series between the primary inductance coil L2 of the transformer T and the control chip U1. The N pole of the Zener diode D2 is connected to the negative pole of the amplifier P1 thr...

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PUM

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Abstract

The invention discloses a constant-voltage drive power supply for a white LED on the basis of a photocoupling feedback circuit.The power supply is characterized by mainly comprising a diode rectifier U, a transformer T, a control chip U1, an amplifier P1, an input anti-interference circuit connected between the positive pole output end of the diode rectifier U and a primary inductance coil L1 of the transformer T in series, a resistor R3 connected between the negative pole output end of the diode rectifier U and a VCC pin of the control chip U1 in series, a grid electrode drive circuit connected between a primary inductance coil L2 of the transformer T and the control chip U1 in series, a voltage-stabilizing diode D2, a resistor R5 and a constant-voltage output circuit, wherein the N pole of the voltage-stabilizing diode D2 is connected with the negative pole of the amplifier P1 through a resistor R4, the P pole of the voltage-stabilizing diode D2 is grounded, one end of the resistor R5 is connected with a GND pin of the control chip U1, the other end of the resistor R5 is grounded, and the constant-voltage output circuit is connected with a secondary inductance coil L3 of the transformer T.The drive power supply can detect output voltage in real time, adjust output voltage in real time and make work of the LED more stable.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a constant-voltage driving power supply for white LEDs based on a photoelectric coupling feedback circuit. Background technique [0002] At present, due to the characteristics of low energy consumption, long service life, safety and environmental protection, LED lamps have become one of the mainstream products for people's living lighting. With the popularity of LEDs and the continuous improvement of people's requirements for lighting effects, new challenges have been brought to LED drive power supplies. At present, the stability of the traditional LED driving power is not high, and it is easily affected by the fluctuation of the mains power, which greatly reduces the lighting effect of the LED and cannot meet people's lighting requirements. Contents of the invention [0003] The purpose of the present invention is to overcome the defect of low stability of the traditional LED drivi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37
Inventor 刘磊
Owner CHENGDU BAIMIAO NETWORK TECH CO LTD
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