Hyungjoon Kim, Changwoo Yoon, Sewan Choi,“An Improved Current-fed ZVS Isolated Boost Converter for Fuel Cell Applications”
Abstract : This paper proposes a novel current-fed ZVS
isolated boost converter suitable for fuel cell applications.
Preserving the 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. The proposed converter can achieve
ZVS at a lighter load condition with less leakage inductance.
These characteristics of the proposed converter lead to a high
overall efficiency over wider load range. Experimental results on
a 1kW prototype are provided to validate the proposed concept.