A Novel Integrated Transformer Structure for High Efficiency LLC Converter

The high-efficiency, high-current and low-cost power solutions are required for data centers application, in order to reduce the transmission loss on cables, the high input-voltage dc distribution power architecture has been adopted, the 380-12 V high output current isolated converter is widely used in this application. This paper presents a 300-kHz 1-kW LLC resonant converter using novel integrated transformer and Gallium nitride device that are designed and optimized for the LLC resonant converter. The novel integrated transformer structure is proposed and designed for reducing core-loss, secondary conduction-loss and achieving no gap-loss. In the end, a laboratory prototype is designed and tested. The experimental results have verified the performance of the proposed LLC resonant converter with novel integrated transformer.