Title: Two-stage isolated bidirectional on-board charger and control technology

Authors: Kai Zhou; Shaolong Zheng; Ningzhi Jin; Dongyang Sun

Addresses: Engineering Research Center of Automotive Electronics Drive Control and System Integration, Ministry of Education, Harbin University of Science and Technology, No. 52, Xuefu Road, Harbin, Heilongjiang, 150080, China ' Engineering Research Center of Automotive Electronics Drive Control and System Integration, Ministry of Education, Harbin University of Science and Technology, No. 52, Xuefu Road, Harbin, Heilongjiang, 150080, China ' Engineering Research Center of Automotive Electronics Drive Control and System Integration, Ministry of Education, Harbin University of Science and Technology, No. 52, Xuefu Road, Harbin, Heilongjiang, 150080, China ' Engineering Research Center of Automotive Electronics Drive Control and System Integration, Ministry of Education, Harbin University of Science and Technology, No. 52, Xuefu Road, Harbin, Heilongjiang, 150080, China

Abstract: A two-stage isolated bidirectional on-board charger that can realise bidirectional energy flow is proposed in this paper. The on-board power battery can both obtain energy from the grid and discharge it to external devices. The bidirectional on-board charger is composed of a front-stage bidirectional totem pole PFC converter and a rear-stage CLLC resonant converter. The equivalent model is established using the fundamental analysis method. Its voltage gain characteristics and resistive boundary are then analysed to ensure that the on-board charger can realise soft switching in the full load range. The front converter adopts double closed-loop control, and the rear converter adopts pulse frequency control so that constant current output or constant voltage output modes occur to charge the power battery. Simulation software is then used to build a 3.3 kW system model, and the simulation results verify the correctness of the theoretical analysis and structural design.

Keywords: electric vehicle; two-stage structure; bidirectional on-board charger; soft switching; CLLC resonant converter.

DOI: 10.1504/IJEHV.2021.123497

International Journal of Electric and Hybrid Vehicles, 2021 Vol.13 No.3/4, pp.362 - 386

Received: 11 Oct 2021
Accepted: 23 Dec 2021
Published online: 23 Jun 2022 *

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