Study and Implementation of a High-Efficiency 2-kW LiFePO4 Battery Charger for Electric Vehicle Applications

• Main Authors: Hsin-Yu Chen, 陳信佑
• Other Authors: Yu-Kang Lo
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/38993146537545782809

碩士 === 國立臺灣科技大學 === 電子工程系 === 100 === This thesis presents the study and design of a LiFePO4 battery charger for electrical vehicle applications. The front stage is a bridgeless power factor correction (PFC) circuit to achieve high power factor and low input current harmonics. Due to the bridgeless topology, the conversion efficiency is improved. The post stage is full-bridge series resonant converter (FB-SRC) with zero-voltage switching (ZVS). It can reduce the voltage stresses on the power switches, raise the efficiency and achieve electrical isolation between input and output. An interleaved buck converter is used to achieve low output ripple and accomplish constant current/constant voltage battery charging scheme. Finally a 2-kW battery charger is implementd and tested. The experimental results are shown to verify the feasibility of the proposed charger system. A 92% effcieny is achieved by the studied three-stage circuit under 220V input voltage condition.