A novel integrated multi-elements resonant converter

This paper proposes a novel passive integration method for multi-element resonant converters. Based on this method, the passive integration for 3-element, or higher order elements resonant converters are achievable. Most of passive components (capacitors, inductors and transformer) are integrated into one module to achieve high power density. The proposed multi-winding transformer structure with integrated inductor and capacitor are analyzed with a detailed cantilever model. Design guidelines are summarized for the control of the component values. One prototype of 1.2kW, 800 kHz 400V/48V 5-element resonant converter is built and tested to verify the proposed structure. The power density can be achieved as high as 171W/inch³.