Bi-directional phase-shifted full-bridge soft switch circuit

Abstract

The invention provides a bi-directional phase-shifted full-bridge soft switch circuit which comprises a transformer T, a first bi-directional phase-shifted full-bridge circuit, a second bi-directional phase-shifted full-bridge circuit and a resonance circuit. The transformer T is respectively connected with the first bi-directional phase-shifted full-bridge circuit and the second bi-directional phase-shifted full-bridge circuit through the resonance circuit. Power consumption is reduced, and the safety coefficient is increased.

Description

technical field [0001] The invention relates to a bidirectional phase-shifting full-bridge soft switch circuit. Background technique [0002] An indispensable process in the lithium battery production process is formation, which is to charge and discharge the battery twice. The charging and discharging technology of the formation power supply equipment directly affects the performance and use of the battery. [0003] On the one hand, based on technical and cost considerations, most of the existing battery formation charging and discharging equipment adopts a unidirectional phase-shifting power conversion structure, and the energy released during the battery discharge process is consumed through resistance discharge, resulting in extreme Large energy waste; for large-scale battery manufacturers, the electricity cost of battery formation can account for 20% to 30% of the production cost, and the annual electricity fee for formation testing is a considerable expense; in view of...

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Problems solved by technology

[0003] On the one hand, based on technical and cost considerations, most of the existing battery formation charging and discharging equipment adopts a unidirectional phase-shifting power conversion structure, and the energy released during the battery discharge process is consumed through resistance discharge, resulting in extreme Large energy waste; for large-scale battery manufacturers, the electricity cost of battery formation can account for 20% to 30% of the production cost, and the annual electricity fee for formation testing is a considerable expense; in view of this problem, we are now How to reduce the consumption of discharge energy and reuse it has become an urgent problem for battery manufacturers

[0004] On the other hand, in the formation charging and discharging equipment, the phase-shifting full-bridge module adopts the traditional hard switching mode, and the switching element is turned on or off the circuit under the condition of bearing voltage or current, so when it is turned on and off In the process, a large switching loss will be generated, and the higher the switching frequency, the greater the switching loss; at the same time, the oscillation of the distributed inductance and parasitic capacitance of the circuit will be aroused during the switching process, which will bring additional loss and generate electromagnetic interference. Therefore, the frequency of the hard-switching power supply cannot be too high, and measures to prevent electromagnetic interference must be taken. The EMI characteristics are poor and the efficiency is low, and its power switching elements work in the hard-switching mode, and the switching loss is large. It is difficult to increase the power density through high frequency

During the operation of the power switch circuit, the upper and lower tubes are prone to accidents, and the safety factor is not high.

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