Design and implementation of LLC resonant half bridge converter

LLC resonant converter is proposed for Front End DC/DC conversion application. Three advantages are achieved with this resonant converter. First, ZVS turn on and low current turn off of MOSFETs is achieved. The switching loss is reduced so we can operate the converter at higher switching frequency. Second advantage is that with this topology, we can optimize the converter at high input voltage. And last advantage is that with this topology, we can eliminate the secondary filter inductor, so the voltage stress on secondary rectifier will be limited to two times the output voltage, better rectifier diode can be used and secondary conduction loss can be reduced. The converter utilizes leakage and magnetizing inductance of a transformer. The converter is designed and controlled using self sustained oscillation controller (SSOC).Results are obtained for LLC resonant converter using PSIM simulation software.