A 300-Watt Half-Bridge LLC Resonant Converter Design With Synchronous Rectification

The design of 300 watts LLC half-bridge resonant converter operating within an input range of 350 Vdc to 460 Vdc and output of 48-50 Vdc with the implementation of synchronous rectifier on the secondary side is presented. The design procedure and mathematical computation are likewise incorporated. Simulation result shows that the converter achieves the desired output with the ripple and noise voltage contained below 500mV pk-pk.The simulation for the frequency response also yielded an output of a gain margin of -18dB and a phase margin of 48 degrees which complies with the stability requirements. Likewise, the design achieves zero-volt switching and can fulfill the 20ms holdup time requirement. Meanwhile, the selection of components helps the design to achieve an efficiency of 97.30% at full load and further evaluated to meet the requirements of 80 Plus Gold Efficiency Standard.