This evaluation kit is a reference design for the CLLC bidirectional DC-DC converter stage of an EV’s onboard charger (OBC). The reference design consists of multiple boards which provide for separation between the control and power conversion functions.
The system uses the automotive-grade NVHL040N120SC1 and NVHL020N090SC1 silicon carbide (SiC) MOSFETs. Thanks to the advanced SiC material, these MOSFETs offer higher power density, higher switching frequency, and more efficient operation than silicon-based solutions.
NCV57000 galvanically isolated gate drivers drive the MOSFETs. They feature separate drive outputs and fault detection with reinforced safety insulation.
An NCV4390 power controller implements the CLLC topology, allowing bidirectional power transfer switched by a microcontroller’s control pin: this means that the system can swap between grid-to-battery or battery-to-grid modes while maintaining the correct output voltage and current.
The system also uses onsemi products for the power rails (NCV890100, NCV4274, NCV8715) and the analog signal chain (NCV210, NCV2901, NCV2003, NCV33204), as well as bipolar junction transistors (BJTs), diodes and ESD protection devices.
