A Wide Input Range Isolated Stacked Resonant Switched-Capacitor dc-dc Converter for High Conversion Ratios

Abstract

This paper presents an isolated dc-dc converter architecture for high conversion ratios using the stacked resonant switched-capacitor topology. Capacitive isolation is adopted in place of transformer isolation for saving cost and platform size. With phase shift operation, the topology can support a wide input range with a simple regulation scheme while enabling zero-voltage switching. The topology can be adapted to high conversion ratios via addition of stacking levels while keeping the same magnetics. The experimental results demonstrate a 2-Stack example achieving a peak efficiency of 92.8% and a peak power density of 283 W/inch 3 with 92% efficiency. The converter can also maintain within 3% efficiency drop over 25%-100% load range, and 50%-100% input range.