A Four-Phase High Voltage Conversion Ratio Bidirectional DC-DC Converter for Battery Applications

Energies

Li-Kun Xue²  Ping Wang²  Yi-Feng Wang¹  Tai-Zhou Bei²  Hai-Yun Yan² 

[1] School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China;

关键词: battery;    bidirectional DC-DC converter;    high conversion ratio;    interleaved;    switched capacitor;    coupled inductor;   

DOI  :  10.3390/en8076399

来源: mdpi

【 摘 要 】

This study presents a four-phase interleaved high voltage conversion ratio bidirectional DC-DC converter circuit based on coupled inductors and switched capacitors, which can eliminate the defects of conventional high voltage conversion ratio bidirectional DC-DC converters in terms of high-voltage/current stress, less efficiency and low-power limitation. Parallel channels are used to reduce current stress at the low-voltage side and series connected switched capacitors are used to enlarge voltage conversion ratio, reduce voltage stress and achieve auto current sharing. This paper proposes the operation principle, feature analysis and optimization design considerations. On this basis the objectives of high voltage conversion ratio, low voltage/current stress, high power density, high efficiency and high-power applications can be achieved. Some experimental results based on a 500 W prototype converter (24 V to 48 V at low-voltage side, 400 V at high-voltage side) are given to verify the theoretical analysis and the effectiveness of the proposed converter.

【 授权许可】

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