Full-bridge and half-bridge hybrid converter with auxiliary LC resonant circuit

Abstract

The invention discloses a full-bridge and half-bridge hybrid converter with an auxiliary LC resonant circuit. The converter comprises an inverter circuit, a resonant network, a transformer, a rectification filtering network and the auxiliary LC resonant network. The auxiliary resonant network consists of a series resonant capacitor, a series resonant inductor and a parallel resonant inductor. The main rectification filtering network is a synchronous rectification circuit, with high efficiency and good stability. The auxiliary resonant network is a diode circuit with a simple structure. The auxiliary LC network consists of a series resonant inductor, a series resonant capacitor, and a coupled inductor; the coupled inductor and the TR2 transformer share a common magnetic core. The converter of the invention can realize the zero-voltage turn-on across the full-bridge (FB) arm without increasing the complexity of the control circuit; and in the application environment where the power requirement is high and the oscillation of inputted voltage is not allowed, the converter can ensure that the output works normally when inputted voltage drastically decreases or drops in an effective time (hold-up time) so as not to affect the working state of an overall system.

Description

【Technical field】 [0001] The invention belongs to the technical field of low-voltage and high-current devices, and relates to a switching power supply, in particular to a full-bridge and half-bridge hybrid converter with an auxiliary LC resonant circuit. 【Background technique】 [0002] Energy conversion efficiency has always been a hot spot that people pay attention to. As a representative of power industry efficiency conversion, power conversion devices are widely used in various aspects such as switching power supplies, distributed power supplies, uninterruptible power supplies, etc. Most of the traditional power conversion devices work in The hard switching state has many problems such as large switching loss, large voltage stress, low power density, large EMI, and low conversion efficiency, and the phase-shifted full-bridge and LLC resonant converter can well weaken or solve these problems. [0003] The phase-shifted full-bridge and LLC resonant converters work in the so...

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Problems solved by technology

[0002] Energy conversion efficiency has always been a hot spot that people pay attention to. As a representative of power industry efficiency conversion, power conversion devices are widely used in various aspects such as switching power supplies, distributed power supplies, uninterruptible power supplies, etc. Most of the traditional power conversion devices work in The hard switching state has many problems such as large switching loss, large voltage stress, low power density, large EMI, and low conversion efficiency, and the phase-shifted full-bridge and LLC resonant converter can well weaken or solve these problems

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