Interleaved parallel connection without electrolytic capacitor LED drive power supply and switching method based on boost-buck converter

Abstract

The invention discloses a BOOST-BUCK converter-based interleaved parallel non-electrolytic capacitor LED drive power supply and a switching method. The circuit topology includes AC input, rectifier bridge, filter inductor L f , filter capacitor C f , a BOOST and BUCK interleaved parallel circuit, output filter capacitor and LED load. By the switching tube Q 1 , freewheeling diode D 2 , inductance L 1 , storage capacitor C b Form BOOST circuit. By the switching tube Q 1 , inductance L 1 , L 2 , storage capacitor C b , the output filter capacitor C O And LED load to form a BUCK circuit. Inductance L 1 , L 2 Both work in discontinuous current mode. The present invention has the following advantages and characteristics: the output current ripple is reduced, the power factor is high; the energy storage capacitor C b Designed for large voltage ripple working state; the circuit is controlled by a switch tube, which reduces switching loss.

Description

technical field The invention relates to the technical field of power electronics applications, in particular to an interleaved parallel circuit based on BOOST-BUCK converters, which is suitable for switching power supplies, especially LED drive power supplies, and belongs to AC / DC (AC / DC), DC / DC (DC / DC) ) transformer field. Background technique Light Emitting Diode (LED) has the advantages of energy saving, environmental protection, safety, and long life, and is the fourth-generation light source after incandescent lamps, fluorescent lamps and high-pressure gas discharge lamps. Factors such as high reliability, high power factor, long life, and low cost of the driving power supply restrict the promotion of LED lighting. The LED driver power supply for living lighting often adopts AC power supply, but due to the imbalance between the pulsating instantaneous input power and the constant output power, the output voltage and output current have a large double power frequency ...

AI Technical Summary

Problems solved by technology

Aiming at the problems of short service life, large volume and low efficiency of the isolated driving power in the traditional LED driving power, the present invention optimizes the traditional BOOST-BUCK driving power, and proposes an electrolytic staggered parallel connection based on BOOST-BUCK converters. Capacitive LED driving power supply and its working method

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