Design of integrated passive component for a 1 MHz 1 kW half-bridge LLC resonant converter

The LLC resonant converter has some special characteristics to make it an excellent candidate for front-end DC/DC conversion in a distributed power system. Even with advanced topology, to achieve high power density, the passive component design is still the key issue. Passive integration is used to integrate all the passive components within the resonant tank of the LLC resonant converter into one single component - an integrated L-L-C-T. The design approach and loss estimation of the integrated L-L-C-T component for a 1 MHz 1 kW LLC resonant converter is given in this paper. A prototype is constructed and tested under small signal and in-circuit working conditions.