A novel LLC resonant converter topology: Voltage stresses of all components in secondary side being half of output voltage

Paper presents a novel LLC resonant converter topology, where voltage stresses of all components in secondary side are half of output voltage. The advantages, which are featured in conventional LLC converter, i.e. being easy to obtain full range ZVS for primary side switches, being easy to obtain ZCS for secondary side diodes, resonant inductors and transformer being easy to be integrated and wide range application, are taken on in the presented topology as well, furthermore the prominent advantages that voltage stresses of secondary side diodes and secondary side capacitors are half of output voltages are taken on. Therefore this converter is fit for application with the characteristic of high output voltage. Evolvement of this topology, detailed operation principle and design considerations of key parameters are detailed analyzed. Finally, an experimental prototype of 1100W is built to verify the reliability and practicability of the proposed topology. Efficiency of the prototype with full load is above 96%.