Journal of South China University of Technology (Natural Science Edition) ›› 2017, Vol. 45 ›› Issue (4): 51-58.doi: 10.3969/j.issn.1000-565X.2017.04.008

• Power & Electrical Engineering • Previous Articles     Next Articles

Power Supply System for LLC Resonant Charging of Electric Vehicles

WU Kai-yuan WANG Jia-jia YIN Tong ZHANG Tao   

  1. School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2016-07-14 Revised:2016-10-13 Online:2017-04-25 Published:2017-03-01
  • Contact: 吴开源( 1978-) ，男，博士，副研究员，主要从事逆变电源及其数字化智能控制研究． E-mail:wuky@scut.edu.cn
  • About author:吴开源( 1978-) ，男，博士，副研究员，主要从事逆变电源及其数字化智能控制研究．
  • Supported by:
    Supported by the Science and Technology Planning Project of Guangdong Province( 2013B010402002)

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Abstract:

Proposed in this paper is a STM32-based LLC resonant charging power supply system for electric vehicles,which employs digital PFM ( Pulse Frequency Modulation) for the system control and adopts an LLC resonant topology as well as a four stages + positive and negative pulse charging scheme that meets the charging requirements of lead-acid battery.Test results demonstrate that ( 1) the proposed power supply system helps to implement the whole-course soft switching state of the main circuit of LLC resonant converters; ( 2) the main circuit of LLC resonant converters always operates in the primary-side MOSFET ZVS and the secondary-side rectifier diode ZCS softswitching state,which improves the power conversion efficiency; and ( 3) the combination of battery charging curves and four stages + positive and negative pulse charging scheme can reduce the overcharging as well as gassing polarization,protect the battery and increase the charging speed.

Key words: electric vehicle, charging power supply, lead-acid battery, positive and negative pulse charging, LLC resonance, STM32 chip

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