High-efficiency and high-power phase-shifted full-bridge zero-voltage soft switching circuit

Abstract

The invention provides a high-efficiency and high-power phase-shifted full-bridge zero-voltage soft switching circuit. The high-efficiency and high-power phase-shifted full-bridge zero-voltage soft switching circuit comprises a leading bridge arm, a lagging bridge arm, a first clamping diode, a second clamping diode, a main power transformer, a DC isolation capacitor, a full-wave rectification circuit and a resonant network, wherein the leading bridge arm comprises a first main power tube, a third main power tube, a fifth main power tube and a seventh main power tube, the lagging bridge arm comprises a second main power tube, a fourth main power tube, a sixth main power tube and an eighth main power tube, the first main power tube is connected in parallel with the fifth main power tube, the third main power tube is connected in parallel with the seventh main power tube, the second main power tube is connected in parallel with the sixth main power tube, and the fourth main power tube is connected in parallel with the eighth main power tube. By the high-efficiency and high-power phase-shifted full-bridge zero-voltage soft switching circuit, the loss of the main power tubes can be effectively reduced, the degree of achieving a zero-voltage soft switch by the lagging bridge arm is improved, the volume of the main power transformer is reduced, the problem of serious heat generation of a rectification filter circuit of a secondary side is solved, and the overall efficiency can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of phase-shifting full-bridge zero-voltage soft switching conversion, in particular to a high-efficiency high-power phase-shifting full-bridge zero-voltage soft switching circuit. Background technique [0002] With the development of power supply products in the direction of high power density, high reliability, and high efficiency, phase-shifted full-bridge circuits have been widely used and researched. Compared with the traditional hard-switching circuit, the phase-shifted full-bridge circuit works in the zero-voltage switching mode, and the switching loss is greatly reduced, which helps to increase the switching frequency and reduce the size and weight of power supply products. With the introduction of the phase-shift control chip, through the phase-shift control method, a resonant network and a clamp circuit are added to the original hard switching circuit, and the zero-voltage soft switching of the ma...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a high-efficiency high-power phase-shifting full-bridge zero-voltage soft-switching circuit to solve the serious heating of the main power tube and the lagging bridge arm of the traditional phase-shifting full-bridge zero-voltage soft-switching circuit in high-power applications. It is difficult to realize soft switching, the main power transformer is large in size, the rectification and filtering circuit on the secondary side is seriously heated, and the efficiency of the whole machine is low.

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