APFC method of boost with no DC bias and no electrolytic capacitor

Abstract

The invention discloses an APFC method of boost with no DC bias and no electrolytic capacitor. Two sets of high-frequency and self-excitation push-pull oscillation circuits are connected to a Boost circuit, so that the APFC process includes two low-frequency switch tubes controlled by a single-chip microcomputer MCU respectively regulate and control the high induction of the two sets of high-frequency and self-excitation push-pull oscillation circuits. The method improves the reliability when no electrolytic capacitor is used, and realizes control of accurate pulse duty ratio one by one. Real bottom switch QR is realized, heating is lowered, and output current with low ripples is realized. High power factor and power efficiency are realized, cost is low, and DC bias and electrolytic capacitor pollution problems can be prevented.

Description

technical field [0001] The invention belongs to the technical field of switching power supplies, and in particular relates to a Boost APFC method without DC bias and electrolytic capacitors. Background technique [0002] The traditional Boost topology is one of the basic methods of DC / DC conversion, especially suitable for boosting low-voltage DC to high-voltage DC output. Boost is the most common topology of APFC, and its energy storage inductor has DC bias, which will accelerate the aging of the magnetic core; the APFC energy storage inductor generates serious heat, which restricts the overall optimization of the APFC module in the direction of lightness, thinness, shortness, and smallness. However, it uses common bridge rectifiers and high-voltage electrolytic capacitors. Due to the large volume and short life of electrolytic capacitors, the reliability of switching power supplies is reduced, and it is not conducive to realizing light, thin, short and small high-power swi...

AI Technical Summary

Problems solved by technology

Boost is the most common topology of APFC, and its energy storage inductor has DC bias, which will accelerate the aging of the magnetic core; the APFC energy storage inductor generates serious heat, which restricts the overall optimization of the APFC module in the direction of lightness, thinness, shortness, and smallness

However, it uses common bridge rectifiers and high-voltage electrolytic capacitors. Due to the large volume and short life of electrolytic capacitors, the reliability of switching power supplies is reduced, and it is not conducive to the realization of light, thin, short and small high-power switching power supply modules.

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