Complex forward DC converter

Abstract

The invention discloses a complex forward DC converter which belongs to the field of DC converters. The converter comprises an original edge circuit, a first high frequency transformer, a second high frequency transformer and an auxiliary edge circuit, wherein the original edge circuit comprises a DC power supply, two voltage-dividing capacitors, four power switch pipes and three magnetic reset diodes; both the first high frequency transformer and the second high frequency transformer comprise original edge windings and auxiliary edge windings; and the auxiliary edge circuit comprises two rectifying diodes, a following current diode, a filter inductor, a filter capacitor and a load. The two-path interlaced parallel connection output structure of the original edge of the converter is beneficial to reducing the voltage stress of the rectifying diodes and the size and the volume of an output wave filter and improving equivalent duty ratio and equivalent switching frequency. The invention has high reliability and conversion efficiency and is suitable for a middle and high voltage power conversion occasion.

Description

technical field [0001] The invention relates to a DC converter, in particular to a composite forward DC converter, which belongs to the field of DC converters. Background technique [0002] Switching power supplies are widely used in national production fields such as industrial production, transportation, and new energy power generation due to their significant advantages such as high efficiency, small size, and light weight. With the continuous widening of the application range and the increase of application equipment, higher requirements are put forward for the stability of the power supply system. [0003] The dual-transistor forward converter has been widely used in the industrial field due to its low voltage stress on the primary switching tube, its inherent ability to resist bridge arm shoot-through, and its high reliability. Through the parallel and series combination of the dual-transistor forward converter, the dual-transistor forward converter has been widely us...

AI Technical Summary

Problems solved by technology

[0005] Chinese patent CN1545200A proposes a dual-circuit dual-transistor forward converter topology, which is derived from an input parallel dual-transistor forward converter, which retains the advantages of high reliability of the dual-transistor forward converter, but the converter only It is suitable for use as a DC transformer, that is, it can only work in an open loop to realize the isolation and conversion of DC power, but cannot realize the closed-loop adjustment of the output voltage, and cannot guarantee the stability of the output voltage when the input voltage changes.

Chinese patent CN1725617A proposes a zero-voltage switching composite interleaved parallel dual-transistor forward three-level DC converter, which can realize zero-voltage turn-on of some switch tubes and has the advantages of low voltage stress of the switch tubes, but The number of switching tubes used in the switch is large and the structure is complex, so it is rarely used in practical applications.

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