关键词: 直流开关电源模块, 功率因数校正, 交错并联, LLC谐振变换器, 效率和功率密度

Abstract: In order to improve the system efficiency and power density of railway signal power supply system, the DC switching power modules used in the power system are analyzed, and optimization scheme is proposed for the typical topology circuit. The wide bandgap semiconductor device is used in the circuit. The first stage uses the PFC bridgeless circuit to realize the power factor correction function, and the second stage uses the interleaving LLC resonant soft-switching topology circuit to realize the isolation transformation of different DC voltages. The optimization scheme can effectively improve the efficiency and power density of the DC switching power module, and improve the reliability of power module.

Key words: DC switching power modules, power factor correction, interleaving, LLC resonant converter, efficiency and power density