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This reference design demonstrates the application of Wolfspeed’s 1200V C3M™ SiC MOSFETs to create a 22kW Bi-directional High Efficiency DC/DC Converter for electric vehicle (EV) on-board (OBC) and off-board fast charging applications. This design is compatible with a wide DC bus input voltage range of 380V-900V and a wide DC output voltage range of 480V-800V allowing it to be integrated with both single phase and 3-phase AC-DC stages. A full bridge CLLC resonant converter with a flexible control scheme; implements frequency modulation; phase shift control; adaptive synchronous rectification and a bridge reconfiguration technique. The use of 1200V C3M™ 32mOhm SiC MOSFET’s in a TO- 247-4 package provides the best figure of merit (FOM); reduces switching loss and cross talk.

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