Wolfspeed's Gen 5 SiC MOSFETs are engineered for real-world performance — not just ideal conditions. Built on optimized planar MOSFET design, Gen 5 achieves better RDS(ON) through tightened epitaxy, increased active area, and enhanced soft body diode technology. The result: lower losses, higher reliability, and greater design confidence for automotive and industrial applications.
22 kW Bi-Directional CLLC Utilizing IMS Board
CRD-22DD12N-J2
This reference design demonstrates the application of Wolfspeed’s automotive qualified E3M 1200V SiC MOSFETs in a TO-263-7 (J2) surface mount package to create a 22 kW Bi-Directional High Efficiency DC/DC Converter based on insulated metal substrate (IMS) board for electric vehicle (EV) on-board charger (OBC) and similar applications. The AEC-Q101 compliant E3M™ series MOSFETs are ideally suited for the most challenging on-board applications. This design is intended to work with an active-front-end (AFE) converter that adjusts the input voltage to the DC/DC converter to optimize the system efficiency based on the output (battery) voltage. The range of the DC input is designed to be compatible with both single and three-phase AFE systems while supporting a wide DC output voltage range of 480 V-800 V. 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 32mΩ automotive qualified SiC MOSFETs enhance thermal performance and facilitates assembly automation. The use of IMS PCB in this reference design exhibits superior thermal performance.
The design accomplishes
- Peak efficiency of 98.6% in both charging and discharging mode
- Power density of 9.4 kW/L
- Bi-directional operation
This reference design is offered as a comprehensive design package which can be used as a starting point for new designs with SiC power devices.
Specifications
Charging Mode
- Input Voltage: 380 V – 900 V DC
- Output Voltage: 480 V – 800 V DC Nominal. System capable of 200 V – 800 V DC
- At Vin = 650 V – 900 V DC, Output Power: 22 kW; Output current: 36 A
- At Vin = 380 V – 900 V DC, Output Power: 6.6 kW; Output current: 26.4 A
Discharging Mode
- Input Voltage: 300 V – 800 V DC
- Output Voltage: 360 V – 750 V DC Nominal
- Output Power: 6.6 kW; Output current: 19 A
Full bridge CLLC resonant converter operating at 135 – 250 kHz
Tooled heatsink to simulate cooling plate
CAN interface
Knowledge Center
As AI scales, a greater lens is on the upstream power sources that are expected to keep up with rapidly expanding data center deployments. Amperesand is helping build the cornerstone of tomorrow’s grid by developing highly reliable, medium voltage (MV) SiC-based solid state transformers. Read more to learn how Amperesand and Wolfspeed partnered to make it happen.
