A Single-Stage Modular DCX with High Voltage Conversion Ratio Based on High Frequency LLC Resonant Converter

Data centers are increasingly requiring high-efficiency power supplies with large current output capability. And the high frequency resonant converter is more attractive in industrial application for its high power density and high efficiency. This paper presents a modular and linear extendable single-stage DCX with high voltage conversion ratio which based on high frequency LLC resonant converter. The converter using a planar matrix transformer has successfully achieved ZVS for half bridge switches as well as ZCS for the secondary rectifier circuit. Meanwhile, GaN devices are implemented since compared to conventional high voltage Si MOS, they show much lower parasitic capacitance. A 500 kHz, 400–6 V, 600 W isolated prototype with high conversion ratio has been built and tested as well, which achieved 94.1% peak efficiency.