Research on bidirectional isolated on-board charger based on CLLC resonant converter
by Kai Zhou; Zan Liu; Dongyang Sun; Ningzhi Jin
International Journal of Power Electronics (IJPELEC), Vol. 18, No. 3, 2023

Abstract: This paper presents a bidirectional isolated on-board charging system for electric vehicles. The charging system is composed of a front-end circuit and a back-end circuit. The front-end circuit is a bidirectional totem-pole power factor correction converter, and the back-end circuit is a bidirectional CLLC resonant converter. According to the design requirements of the charging power supply system, the key parameters of the CLLC resonant converter are selected and calculated. Through sampling, the output voltage and input current of the front-end circuit are obtained, and compared with the reference value and compensated, and the on-off time of the switch in the front-end circuit is finally controlled. The latter circuit uses the loop control mode to control the switch frequency of the switch to achieve constant voltage and current charging. A 3.3-kW vehicle charging system prototype was constructed. The simulation and experimental results verify the correctness of the design.

Online publication date: Tue, 29-Aug-2023

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