Three-Phase High-Power and Zero-Current-Switching OBC for Plug-In Electric Vehicles

Energies

Cheng-Shan Wang²  Wei Li²  Zhun Meng²  Yi-Feng Wang²  Jie-Gui Zhou¹ 

[1] The Third Railway Survey and Design Institute Group Corporation, Tianjin 300251, China; E-Mail:;School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China; E-Mails:

关键词: onboard charger;    buck converter;    zero-current-switching;    electric vehicle;   

DOI  :  10.3390/en8076672

来源: mdpi

【 摘 要 】

In this paper, an interleaved high-power zero-current-switching (ZCS) onboard charger (OBC) based on the three-phase single-switch buck rectifier is proposed for application to plug-in electric vehicles (EVs). The multi-resonant structure is used to achieve high efficiency and high power density, which are necessary to reduce the volume and weight of the OBC. This study focuses on the border conditions of ZCS converting with a battery load, which means the variation ranges of the output voltage and current are very large. Furthermore, a novel hybrid control method combining pulse frequency modulation (PFM) and pulse width modulation (PWM) together is presented to ensure a driving frequency higher than 10 kHz, and this will reduce the unexpected inner resonant power flow and decrease the total harmonic distortion (THD) of the input current under a light load at the end of the charging process. Finally, a prototype is established, and experiments are carried out. According to the experimental results, the conversion efficiency is higher than 93.5%, the THD about 4.3% and power factor (PF) 0.98 under the maximum power output condition. Besides, a three-stage charging process is also carried out the experimental platform.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.