Switched Mode Power Supply with High Isolation for High Voltage Applications

This paper introduces a switched mode power supply (SMPS) for power systems that requiring high voltage isolation. The SMPS in this paper consists of a diode full wave rectifier and a full-bridge LLC resonant converter. Isolation of input and output is achieved in the LLC resonant converter's transformer. Dielectric strength is generally determined by the length of creepage path and clearance like insertion the air gap and the insulator. In this paper, the proposed converter operates about 140-kHz switching frequency, maximum power rating of 500-W, maximum output current of 21-A, and output voltage of 24-V. The proposed converter was verified by simulation.