High gain isolating active clamping boost transducer

Abstract

An active clamping-boosting inverter of high-gain isolation type is prepared as realizing high gain output of said inverter by series-connecting the third winding to output capacity of two coupled inductances, absorbing and transferring leakage energy of two coupled inductances nondestructively by series circuit prepared by the first clamping capacity and the first auxiliary switching tube, utilizing series circuit and parallel capacity to realize zero voltage turn on and turn off of said auxiliary switch.

Description

technical field [0001] The invention relates to a DC-DC converter, in particular to a high-gain isolated active clamp boost converter. Background technique [0002] A conventional flyback (Flyback) interleaved parallel DC-DC converter includes two coupled inductors, two freewheeling diodes, two power switches, an output capacitor, and the drain of the first power switch is connected to the first coupling One end of the first winding of the inductor is connected, the drain of the second power switch is connected to one end of the first winding of the second coupled inductor, and the other end of the first winding of the first coupled inductor is connected to the first winding of the second coupled inductor One end of the second winding of the first coupled inductor is connected to the anode of the first diode, one end of the second winding of the second coupled inductor is connected to the anode of the second diode, and the first diode The cathode of the second diode is conn...

AI Technical Summary

Problems solved by technology

This kind of flyback interleaved parallel DC-DC converter is a hard switching operation, the switching loss is large, and the input voltage can be adjusted in a wide range, but the output voltage gain is not large enough, and the leakage inductance energy causes the first power switch tube, the second power switch The voltage spike of the switching tube, the efficiency is low

In recent years, some isolated high-gain boost topologies have been studied successively, one of which is based on the current-mode bridge circuit, adding a series circuit composed of an auxiliary power switch tube and a capacitor to realize the soft switching of the power switch tube. However, this topology requires a large number of power switch tubes, and the current stress of the power switch tubes is relatively large. The other is the resonant conversion topology, which can realize soft switching, but the current flowing through the resonant capacitor is very large.

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