A multi-mode high frequency resonant charging circuit

Abstract

The invention belongs to the field of power electronic resonant converter, and provides a multi-mode high-frequency resonant charging circuit. The charging circuit comprises a DC source, an inverter bridge with multiple bridge arms in parallel, a multi-channel resonant tank, a multi-winding transformer, a high-frequency rectifier bridge and a filter capacitor, wherein the DC source, the inverter bridge, the multi-channel resonant tank, the multi-winding transformer, the high-frequency rectifier bridge and the filter capacitor are connected sequentially. The inverter bridge with multiple bridgearms in parallel is formed by the parallel connection of N pairs of bridge arms. The multi-channel resonant tank at least comprises N equivalent resonant elements. The multi-winding transformer is ofa multi-magnetic-circuit parallel structure, and is at least provided with N branch magnetic circuits. The multi-winding transformer has at least (N-1) primary windings, and the primary windings areelectrically connected with the neutral points of the bridge arms. The multi-winding transformer has at least one secondary winding, and the secondary winding is electrically connected with the high-frequency rectifier bridge. According to the invention, the size of a converter circuit is greatly reduced, the power density increases and the utilization rate of a switch is increased because of thereuse of a switch bridge arm, the reduction of resonant elements and the integration of a transformer.

Description

technical field [0001] The invention belongs to the field of power electronic resonant converters, and more specifically relates to a multi-mode high-frequency resonant charging circuit. Background technique [0002] In the process of high-voltage pulse capacitive load charging and energy storage, the capacitive load is almost short-circuited at the beginning stage, which belongs to heavy load; at the end of charging, the capacitive load is close to open circuit, which belongs to light load or no load. The load varies greatly in the charging process, which requires the charging power supply to be able to adapt to a wide range of capacitive loads. In order to improve the charging efficiency and cycle life of the battery pack, various charging strategies such as constant current-constant voltage charging method, pulse charging method, sine wave charging method, and multi-stage constant current charging method have been studied. [0003] The resonant converter has the advantag...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defects of the prior art, the purpose of the present invention is to provide a multi-mode high-frequency resonant charging circuit, which aims to solve the problem that the existing multi-channel resonant circuit requires multiple sets of inverter bridges and multiple sets of transformers, resulting in large volume and high cost. , the problem of many devices and low switch utilization

Images