A New Series Hybrid DC-DC Converter for Wide Input Range with SiC

摘要

A new series hybrid DC-DC converter targeting for communication power supply with wide input range is designed in this paper implemented with Silicon Carbic (SiC) power transistor. The proposed hybrid converter is a combination of forward and flyback converter with full usage of transformer energy and optimized efficiency. Forward converter is the main energy delivery part and resonant network is utilized for full energy transferring and soft switching. Forward converter resets the magnetizing energy and delivers it to the output. The forward and flyback part are connected in such a novel way where flyback output is in series with the primary side. A highly compact architecture is realized with shared power switch and single core, multi-winding transformer. Due to its low gate charge and parasitic capacitance, SiC devices are premium power transistors for high frequency and high power applications. With a proper transformer design, an efficient series hybrid SiC converter is demonstrated for lOOV-to-400V input at 480W output power.