2 Bias Power in Common-Source Configuration of Back-to-Back FETs

Figure 2-1 shows the back-to-back FETs in a common-source configuration. The common-source configuration requires a total of eleven isolated bias power supply outputs, which includes eight in the AC side and three in the HV battery side. The back-to-back switches in the AC side with a common-source configuration can share the same isolated bias power supply output. In a common-source single-stage OBC configuration, the isolated bias power supply is similar to the dual-stage OBCs with some differences. For example, there is no primary DC side in single-stage OBCs and no low-side switches sharing the same bias power supply output. Refer to the Isolated Bias Power Supply Architecture for HEV and EV Onboard Chargers technical white paper for a detailed description of an isolated bias power supply architecture for dual-stage OBCs with PFC and DC-DC stages.

Figure 2-1 Block Diagram of the 3-Phase Single-Stage OBC With Common-Source Configuration