Fuel cell based interleaved current-fed boost converter with improved input current sharing

In this paper, a fuel cell based interleaved current-fed half bridge boost converter is presented with improved input current sharing even under a duty cycle mismatch. A separate control circuit for current sharing is thus avoided. This is achieved by using a separate clamp capacitor for each phase unlike other conventional circuits which have a common capacitor. The separate clamp capacitors acts like negative feedback and helps in keeping the input currents balanced. The converter preserves the advantages of conventional half-bridge converter such as smaller input current ripple, high gain with less transformer turns ratio etc. Simulation results based on PSpice, illustrating this idea on the proposed converter is provided.