Design of Five-Level Full-Bridge LLC Converter Based on Switching Capacitance

In order to meet the needs of electric vehicle chargers and High-voltage direct current (HVDC) transmission for LLC converter, a new five-level LLC resonant converter is proposed in this paper. The performance of the LLC converter is significantly enhanced by achieving double gain and reducing the voltage stress on the switching tube. The double gain is achieved, the voltage stress of the switching tube is reduced, and the capacitor voltage is self-balanced, and the efficiency is up to 98.33% under the modulation strategy. In order to verify the accuracy of the proposed converter, a 100kHZ, 200V converter was built in PSIM simulation for verification.