GaN High Density 300W AC-DC Converter

A 300W AC-to-DC high-density and low-profile converter has been designed and demonstrated. The circuit topology includes a 2-phase interleaved PFC input stage, an LLC dc-dc stage, and a synchronous rectification output stage. The design includes GaN power ICs and off-the-shelf controllers running at 500kHz. This new design has resulted in a power density of 29W/in3. The waveforms demonstrate zero-voltage switching in all stages and the performance results show high efficiency and acceptable component temperatures.