Interleaved Boost-Integrated LC Series Resonant Converter with Pulse Frequency Modulation for Wide Voltage Range Applications

This paper presents a novel interleaved boost integrated LC series resonant converter with two output rectification modes, which are voltage-doubler rectifier (VDR) mode and voltage-quadrupler rectifier (VQR) mode with constant output voltage for wide input voltage range applications. With the proposed pulse frequency modulation, the maximum magnetic flux density of high frequency transformer is only related with the resonant frequency rather than the switching frequency. Hence, the transformer can be frequency-free designed. Finally, a 470 W prototype with a switching frequency range from 50 kHz to 140 kHz is built to verify the operation principles of the proposed converter and modulation.