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An Improved Current-Fed ZVS Isolated Boost Converter for Fuel Cell Applications

2010; Institute of Electrical and Electronics Engineers; Volume: 25; Issue: 9 Linguagem: Inglês

10.1109/tpel.2010.2048044

1941-0107

Hyungjoon Kim, Changwoo Yoon, Sewan Choi,

Multilevel Inverters and Converters

This paper proposes an improved current-fed zero-voltage switching isolated boost converter suitable for fuel cell applications. Preserving the inherent advantages of the current-fed converter which include smaller input current ripple, lower diode voltage rating, and lower transformer turns ratio, the proposed converter does not require any clamping and start-up circuits unlike the conventional current-fed converters. The voltage ratings of the primary switches and secondary diodes of the proposed converter are significantly reduced. Some alternative schemes of the proposed converter without the voltage-second unbalance are presented. These characteristics of the proposed converter lead to a high overall efficiency over wider load range. Experimental results on a 1 kW prototype are provided to validate the proposed concept.