The single-stage OBC is an isolated charger topology that rectifies a single AC input to a battery-voltage output for EV charging, leveraging 4-quadrant GaN switches to replace standard two-stage architectures.

Bi-directional HV GaN devices replace the back-to-back structure, enhancing system performance while reducing BoM size and cost, enabling single-stage AC-DC bidirectional power conversion without a PFC inductor or a DC bus capacitor.

In this session, Gabriele Clapier and Marco Ruggeri of Renesas explore how matrix converters and GaN bidirectional switches are enabling more efficient, compact, and cost-effective next-generation on-board chargers.

What you’ll learn:

• How OBC converters will evolve to a single-stage architecture
• Overview of the ideal 4-quadrant switch
• System diagram review