Title: Research on two-stage isolated on-board charger and control technology

Authors: Kai Zhou; Hanfeng Wang; 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

Abstract: A two-stage isolated on-board charger (OBC) is proposed for electric vehicles. The OBC adopts two-stage topology including three-phase power factor correction (PFC) converter and full-bridge LLC resonant converter. The OBC can charge the high voltage battery and achieve power factor correction function. Compared with the conventional control circuit, the pre-stage PFC circuit adopts current inner loop composite controller, the composite controller is composed of a repetitive controller and a proportional and integral (PI) controller connected in parallel, which can reduce the total harmonic distortion (THD) of the input AC current. The rear-stage adopts full-bridge LLC resonant converter operates with zero-voltage switching in the full output voltage range. The main parameters of the pre-stage PFC circuit and the rear-stage circuit were designed, the OBC has an input AC voltage range between 187-253 V, and the output DC voltage range between 280-420 V. Simulation and experimental results confirm the correctness of the theoretical analysis.

Keywords: two-stage structure; on-board charger; three-phase PFC circuit; composite controller; LLC resonant converter; high-frequency operation.

DOI: 10.1504/IJEHV.2022.125262

International Journal of Electric and Hybrid Vehicles, 2022 Vol.14 No.1/2, pp.65 - 86

Received: 15 Jan 2021
Accepted: 05 Mar 2021
Published online: 05 Sep 2022 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article