Series Resonant DC-DC Converter with an AC-Switch-Based Full-Bridge Boost Rectifier

Abstract

This paper proposes using an ac-switch at the output side of the series resonant converter (SRC) to boost the voltage with the full-bridge diodes rectifier. The proposed converter operates at a fixed switching frequency close to the resonant frequency. The output voltage of the converter could be regulated by adjusting the duty-cycle of the ac-switch instead of the frequency modulation. The proposed circuit features the soft-switching characteristics for the primary side semiconductors and the full-bridge diode rectifier. The mathematical model of the proposed converter is developed based on the described operating modes. The experimental results are obtained using a 300 W prototype to show the feasibility of the proposed converter at different input voltage and input power range. The peak efficiency of the proposed converter equals 97% at the nominal input voltage.