Analysis of Strategy for Achieving Zero-Current Switching in Full-Bridge Converters

作者：Shu, Liangcai; Chen, Wu^*; Ma, Dajun; Ning, Guangfu

来源：IEEE Transactions on Industrial Electronics, 2018, 65(7): 5509-5517.

DOI：10.1109/TIE.2017.2779443

• Full-bridge converter
• pulsewidth modulation (PWM)
• zero-current switching (ZCS)
• zero-voltage and zero-current switching (ZVZCS)

Conventional zero-voltage and zero-current-switching (ZVZCS) full-bridge converters are widely used because they can realize zero-voltage switching (ZVS) for the leading leg and zero-current switching (ZCS) for the lagging leg. However, the large turn-off loss of the leading leg is still unacceptable in high-voltage high-power applications where insulated-gate bipolar transistors (IGBTs) with current tailing are employed. Hence, it is preferable to achieve ZCS for all IGBTs of full-bridge converters. This paper analyzes the ZCS conditions for pulsewidth modulated (PWM) full-bridge converters and proposes a general strategy for achieving ZCS for main switches, including the control strategy and design method of the topology. Based on this theory, a novel ZCS PWM full-bridge converter with simple auxiliary circuit is derived and tested. It can achieve ZCS not only for the main switches of full-bridge converter, but for the auxiliary switch as well, and obtain high efficiency. The operation principle of the proposed ZCS PWM full-bridge converter and the design procedure are presented. The experimental results of a 600 V/2.5 kW prototype are also included to verify the theoretical analysis.

• 出版日期2018-7
• 单位东南大学