Title: A ZCS buck excitation converter for electric vehicle with wound rotor synchronous motors

Authors: Yi-Feng Wang; Liang Yang; Cheng-Shan Wang; Yi-Qiang Zhang

Addresses: School of Electrical Engineering and Automation, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China ' School of Electrical Engineering and Automation, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China ' School of Electrical Engineering and Automation, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China ' LG Electronics (Shanghai) R&D Center, LG Electronics, 27 Xin Jinqiao Rd, Pudong, Shanghai 201206, China

Abstract: In this paper, a high power density zero-current switching (ZCS) Buck excitation converter for electric vehicle (EV) with wound rotor synchronous motors is proposed. To eliminate the pulse noises in excitation current when considering the parasitic parameters for the rotor coil, a small coupled inductor and a small resonant capacitor are combined with basic Buck circuit. Owing to the existence of resonance, zero-current soft-switching for both turn-on and turn-off transitions is achieved, and more importantly, a constant output current without any spikes is guaranteed, which contributes to efficiency promotion and electromagnetic interference (EMI) reduction. Since no large-sized output filters or resonant components are adopted, the volume of the converter is minimised. In the end, PSIM simulation results are presented to verify the feasibility of theoretical analysis.

Keywords: vehicle design; electric vehicles; wound rotor synchronous motors; converter excitation; ZCS; zero-current switching; Buck converter; power density; impulse current; current noise; coupled inductor; resonant capacitor; electromagnetic interference; EMI reduction; simulation.

DOI: 10.1504/IJVD.2015.073113

International Journal of Vehicle Design, 2015 Vol.69 No.1/2/3/4, pp.50 - 70

Received: 11 Oct 2014
Accepted: 03 Feb 2015
Published online: 20 Nov 2015 *

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