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Open AccessArticle

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

by Cheng-Shan Wang 1, Wei Li 1,†, Zhun Meng 1,†, Yi-Feng Wang 1,* and Jie-Gui Zhou 2
1
School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China
2
The Third Railway Survey and Design Institute Group Corporation, Tianjin 300251, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Joeri Van Mierlo
Energies 2015, 8(7), 6672-6704; https://doi.org/10.3390/en8076672
Received: 4 May 2015 / Revised: 14 June 2015 / Accepted: 23 June 2015 / Published: 30 June 2015
(This article belongs to the Special Issue Advances in Plug-in Hybrid Vehicles and Hybrid Vehicles)
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. View Full-Text
Keywords: onboard charger; buck converter; zero-current-switching; electric vehicle onboard charger; buck converter; zero-current-switching; electric vehicle
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Wang, C.-S.; Li, W.; Meng, Z.; Wang, Y.-F.; Zhou, J.-G. Three-Phase High-Power and Zero-Current-Switching OBC for Plug-In Electric Vehicles. Energies 2015, 8, 6672-6704.

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