Boost no-DC-magnetic-bias and no-electrolytic-capacitor APFC circuit

Abstract

The invention provides a Boost no-DC-magnetic-bias and no-electrolytic-capacitor APFC circuit which is characterized by comprising a first set of high-frequency self-excitation push-pull oscillation circuits, a second set of high-frequency self-excitation push-pull oscillation circuits, an MCU, a magnetic integrated transformer TR with a magnetic core shaped like a Chinese character "ri", and an MCU power supply sampling circuit. The winding N11 and the winding N12 of the first set of high-frequency self-excitation push-pull oscillation circuits are respectively wound on one edge column of the magnetic integrated transformer TR. The winding N14 and the winding N13 of the second set of high-frequency self-excitation push-pull oscillation circuits are respectively wound on the other edge column of the magnetic integrated transformer TR. The winding NV of the MCU power supply sampling circuit is wound on the center column of the magnetic integrated transformer TR. The MCU power supply sampling circuit provides electric energy and a sampling signal to the MCU according to an inductive electrical signal generated by the winding NV. The MCU processes the received sampling signal and controls a switching tube T1 and a switching tube T2 to work according to the processed information. The Boost no-DC-magnetic-bias and no-electrolytic-capacitor APFC circuit has advantages of reduction of heating, low ripple of output current, high power factor, high electric power efficiency and low cost.

Description

technical field [0001] The present invention belongs to the field of switching power supply technology, and specifically relates to Boost APFC circuits without DC bias and without 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 ...

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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