Voltage regulation and efficiency optimization in a 100 MHz series resonant DC-DC converter

This paper describes a closed-loop regulated dual half-bridge series resonant dc-dc converter operated at up to 100 MHz switching frequency using GaN half-bridge stages with integrated gate drivers. A digital online efficiency optimization technique together with burst-mode control are developed and applied, to achieve output voltage regulation and efficiency improvements. An experimental prototype is designed and constructed to convert an input de voltage of 20 V to a 12 V output at 100 MHz switching frequency and up to 1.75 W of output power, with up to 82 % efficiency.