What is an OBC and how would it be different in V2X OBC?
An onboard charger (OBC) is a power conversion device in a vehicle that converts AC power to DC power to charge the onboard high voltage battery to from an AC outlet via SAE J1772 connector. In the V2G AC system, it will act as a DER with power control mode and execute functions required by IEEE 1547. In V2H/V2L, it will generate a clean sinusoidal voltage to provide power to various types of loads. The required behavior (i.e. functional specification) and the hardware are significantly different. To name a few, the converter's operation mode (CV/CC for charging vs. power control vs. AC CV control), bidirectional isolated power converter's topology (LLC vs. DAB), precise phase and frequency detection for IEEE 1547 functions. This presentation will cover the differences and challenges of designing an OBC as a DER from an OBC system and hardware perspectives with some introductions of a conventional unidirectional OBC.
Key Takeaways:
- Conventional unidirectional OBC's role
- Differences of unidirectional OBC, bidirectional OBC, and V2X OBC (OBC as a DER)
- Key design changes and challenges from conventional OBC to V2X OBC, with some key waveforms
Yukihiro Hatagishi
EV Electronics Lead
Diamond and Zebra Electric
Yukihiro Hatagishi works as EV Electronics Lead in Diamond and Zebra Electric (formally known as Diamond Electric) and has been the team leader to develop V2X (i.e. V2G, V2H, and V2L) capable onboard charger. This development includes a V2X OBC for a V2G AC EPIC project led by Southern California Edison with Stellantis. As head of the project, Mr. Hatagishi had led the V2X OBC design from standard analysis to creating testing plans. In addition, he has hands-on experiences of designing the system specification to specify the functions needed for IEEE 1547-2018 and SAE J3072 conformances, and designing the bidirectional converter hardware.
EV Electronics Lead
Diamond and Zebra Electric
Yukihiro Hatagishi works as EV Electronics Lead in Diamond and Zebra Electric (formally known as Diamond Electric) and has been the team leader to develop V2X (i.e. V2G, V2H, and V2L) capable onboard charger. This development includes a V2X OBC for a V2G AC EPIC project led by Southern California Edison with Stellantis. As head of the project, Mr. Hatagishi had led the V2X OBC design from standard analysis to creating testing plans. In addition, he has hands-on experiences of designing the system specification to specify the functions needed for IEEE 1547-2018 and SAE J3072 conformances, and designing the bidirectional converter hardware.