Totem Pole PFC Reference Design for Automotive Applications

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VisIC Technologies Ltd. has announced its new reference design for Totem Pole PFC aimed at OBC for electric vehicles. This reference design is another step in the ongoing effort to support their customers and improve the power conversion systems to fit the demanding size, cost, and efficiency targets for the automotive market.

Today onboard-chargers embrace the bidirectional requirements of the V2G and G2V by using new topologies such as the Totem Pole PFC. The new reference design from VisIC is aimed at the higher power segment of 7.2kW with increased efficiency, size, and cost structure.

Based on the VisIC V22TC65S1A 22 mohm, 650 V, 100 A GaN device that is optimized for the PFC stage. The design requires a single device per leg and achieves a power density above 130 W/inch3 or 8 kW/L, operating at 140kHz without paralleling GaN devices and giving an efficiency above 98%.

The reference design kit includes everything needed to operate the unit in both PFC and inverter modes, from the onboard firmware on MCU to the cold plate for high power operation, as well as all the design files.