A Wide-ZVS Range LCC Resonant Converter and Controller Design

In order to solve the problem that the lag arm ZVS is difficult to achieve when the phase-shifted full-bridge LCC resonant con-verter has a light load, the resonant current at heavy load is large, resulting in only a narrow ZVS range and a large conduc-tion loss and so on. An improved circuit topology of a full-bridge fixed-frequency phase-shifted LCC resonant converter is pro-posed and a double-closed-loop controller is designed. Firstly, the converter is analyzed and designed. Secondly, the control structure and design process of the system are given. Finally, simulation experiments are carried out. The theoretical analysis and simulation results show that the improved topology struc-ture and control system proposed in this paper are reasonable, realize a wide range of ZVS, effectively reduce the conduction loss, and thus verify the feasibility of the design.