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

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...

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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

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