Flyback light emitting diode (LED) switching voltage stabilization driving power supply based on power factor correction circuit

Abstract

The invention discloses a flyback light emitting diode (LED) switching voltage stabilization driving power supply based on a power factor correction circuit. The flyback LED switching voltage stabilization driving power supply is characterized by mainly comprising a control chip U2, a diode rectifier U1, an operational amplifier, a transformer T, a triode VT1, a diode D1, a primary flyback circuit, the power factor correction circuit and a constant current driving circuit, wherein the power factor correction circuit is connected in series between a negative electrode output end of the diode rectifier U1 and an emitter of the triode VT1, and the constant current driving circuit is connected with the transformer T and the primary flyback circuit separately. By the flyback LED switching voltage stabilization driving power supply, a current peak can be controlled to be constant, meanwhile, the switching duty ratio is controlled, the time proportion of the whole switching period is maintained and output constantly, so that constant output current is achieved; and moreover, the flyback LED switching voltage stabilization driving power supply only requires 0.5-microampere starting current, the starting power consumption is reduced, the efficiency of the flyback LED switching voltage stabilization driving power supply is greater than 80%, the no-load power consumption is smaller than 30mW, and thus, the efficiency of the flyback LED switching voltage stabilization driving power supply is improved.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a flyback LED switching stabilized voltage driving power supply based on a power factor correction circuit. Background technique [0002] Under the background of global energy shortage and increasing environmental protection requirements, countries all over the world are vigorously developing green energy-saving lighting. As a revolutionary energy-saving lighting technology, LED lighting is developing rapidly. At the same time, people's requirements for LED switching drive power are also increasing. However, the existing LED switch driving power circuit has defects of low efficiency, low power factor, low current control accuracy, and low reliability, so the existing LED light switch driving power circuit cannot meet people's requirements. [0003] Therefore, it is urgent to provide an LED switching regulated driving power supply that can improve efficiency and power factor and ensure...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of low efficiency, low power factor, and low current control accuracy in the LED switch drive power supply circuit in the prior art, and provide a flyback LED switch voltage regulator based on a power factor correction circuit drive power

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