An LLC resonant full-bridge inverter-link DC-DC converter with an anti-resonant circuit for practical voltage step-up/down regulation

A novel LLC resonant dc-dc converter with an anti-resonant circuit (ARC) is presented in this paper. The LLC dc-dc converter with ARC can improve the sensitivity of voltage conversion ratio in the dc voltage step-down area, then achieve the excellent performance on the output voltage and power regulations by pulse frequency modulation (PFM) under soft switching conditions. The theoretical analysis and the experiment results on the essential switching and steady-state performances including the power loss analysis of the proposed LLC dc-dc converter are demonstrated, and its practical effectiveness is described. Furthermore, the modified LLC dc-dc converter with ARC is newly introduced and its essential performances are demonstrated by a simulation analysis.