Title: Topology design and control strategy of bidirectional DC/DC converter for electric vehicles

Authors: Kai Zhou; Yue Sun; Chengyu Jia

Addresses: Engineering Research Center of Automotive Electronics Drive Control and System Integration (Ministry of Education), Harbin University of Science and Technology, Harbin, Heilongjiang, China ' Engineering Research Center of Automotive Electronics Drive Control and System Integration (Ministry of Education), Harbin University of Science and Technology, Harbin, Heilongjiang, China ' Sany Heavy Industry Co., Ltd., Changsha, Hunan, China

Abstract: A two-stage bidirectional DC/DC converter for electric vehicles is proposed in this paper. The converter has the features of bidirectional power flow and a wide input voltage range, which can realise output voltage stability. The front stage adopts a bidirectional CLLLC resonant converter with good characteristics of soft switching in both forward and reverse directions and adopts open-loop fixed frequency control to realise efficient power transmission. The rear stage adopts an interleaved parallel bidirectional buck/boost converter to reduce the current ripple and increase the transmission power and adopts the duty cycle secondary distribution method to achieve current equalisation and regulate the output voltage based on the voltage and current double closed-loop control. Bidirectional DC/DC converter's principle analysis and parameter calculation are completed, and the correctness and feasibility of the theoretical analysis are verified by simulation results.

Keywords: electric vehicle; bidirectional DC/DC converter; bidirectional CLLLC resonant converter; interleaved parallel buck/boost converter.

DOI: 10.1504/IJEHV.2024.138982

International Journal of Electric and Hybrid Vehicles, 2024 Vol.16 No.2, pp.158 - 183

Received: 01 Jul 2023
Accepted: 13 Nov 2023
Published online: 06 Jun 2024 *

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