CRD-22DD12N

This reference design demonstrates the application of Wolfspeeds 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.

The design accomplishes

• Peak efficiencies of 98.5% in both charging and discharging mode
• Power densities of 8kW/L

This reference design is offered as a comprehensive design package which can be used as a starting point for new SiC designs.

Specifications

Charging Mode

• Input Voltage : 380V-900V DC
• Output Voltage : 480V-800V DC Nominal. System capable of 200V-800V DC
• At Vin=650V-900V DC ; Output Power : 22kW ; Output current : 36A
• At Vin=380V-900V DC ; Output Power : 6.6kW ; Output current : 26.4A

Discharging Mode

• Input Voltage : 300V-800V DC
• Output Voltage : 360V-750V DC Nominal
• Output Power : 6.6kW ; Output current : 19A

• Full bridge CLLC resonant converter operating at 135-250kHz
• Tooled heatsink to simulate cooling plate
• CAN interface