High-frequency soft-switching resonant DC converter and voltage gain calculation method

Abstract

The invention discloses a high-frequency soft-switching resonant DC converter. The high-frequency soft-switching resonant DC converter absorbs leakage inductance of a transformer to serve as a part ofresonant inductance, and absorbs junction capacitance of a switching tube and junction capacitance of a diode to serve as a part of resonant capacitance. According to the high-frequency soft-switching resonant DC converter, zero-voltage switching of the switching tube and the diode and zero-current switching-off of the diode can be simultaneously achieved, the switching loss of the converter is nearly zero, the efficiency of the converter is improved, voltage stress of the diode is ensured to be clamped to twice the output voltage, and the voltage stress is reduced.

Description

technical field [0001] The invention relates to a technique of a resonant converter, in particular to a high-frequency soft-switching resonant DC converter and a voltage gain calculation method. Background technique [0002] Increasing the switching frequency of the converter is an effective means to increase its power density. But for hard switching circuits, increasing the switching frequency means increasing the switching loss, which will greatly reduce the overall efficiency of the converter. Therefore, it is very important to study the soft switching technology, that is, to increase the switching frequency of the converter without increasing the switching loss. [0003] Resonant technology is an important means to realize soft switching. Since most of the commonly used switching tubes currently use MOSFETs, it is a common method to use their body diodes to realize zero-voltage switching, such as LLC resonant converters, phase-shifted full-bridge converters, and so on....

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-frequency soft-switching resonant DC converter and a voltage gain calculation method. The present invention realizes the zero-voltage switching of the switch tube and the diode and the zero-current shutdown of the diode, and the switching loss of the converter is almost zero. , improve the efficiency of the converter, and solve the technical problem that the zero-voltage switching quasi-resonant converter can only improve the switching conditions of one device in the switching tube and diode, and the voltage stress of the zero-voltage switching multi-resonant converter is too large

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