Quasi-fixed Frequency and Phase Modulation Synchronous Control Based LCC Resonant Converter

This paper presents a novel quasi-fixed frequency based synchronous control scheme for the LCC resonant converter to suit the high frequency, low voltage and high current operating condition. Utilizing ZVS technique, the proposed method can guarantee the reliable load control ability and ensure the stable zero voltage by adjusting the frequency and the phase in the limited range. To show the effectiveness of the control algorithm, a LCC resonant converter with quasi fixed frequency (QFC) and phase modulation synchronous control is addressed in this paper. The LCC converter works in a continuous conduction mode near 700 kHz and implementing zero-voltage switching (ZVS) with 200-425 V input and 48 V/42 A output simultaneously, and it can suit the wide input/output range with high efficiency using the designed control scheme through the PSIM simulation results.