Dual active-clamped step-up DC-DC converter with reduced voltage stress for low-DC renewable energy sources

This paper proposes a dual active-clamped step-up DC-DC converter. The proposed converter has the dual active-clamping circuit with parallel-connected two transformers. Compared to the previous active-clamped step-up DC-DC converters, the voltage stresses of the semiconductor devices can be reduced in the proposed converter. The proposed converter has low switching power losses and high power efficiency. The use of parallel-connected two transformers gives a low-profile design for the step-up DC-DC converter for low-DC renewable energy sources like photovoltaic module and fuel cell. The performance of the proposed converter is verified from 350 W (350 V / 1 A) experimental prototype circuit for 50 V photovoltaic module voltage.