Deploying SiC BJTs in an 800-V switched-mode power supply for hybrid & electric vehicles

Hopkins, Andrew and McNeill, Neville and Drury, William D. and Atkins, Andrew (2017) Deploying SiC BJTs in an 800-V switched-mode power supply for hybrid & electric vehicles. In: IEEE 26th International Symposium on Industrial Electronics, 2017-06-19 - 2017-06-21.

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    Abstract

    An SMPS for hybrid electric vehicle and electric vehicle applications is presented. The use of SiC BJTs in the primary-side switching circuitry is investigated. Practical deployment aspects are addressed. Particular attention is given to the design of the BJT base driver stage and a bespoke turn-on switching-aid circuit. Mathematical design calculations are not presented, but the proposed circuitry is demonstrated in a 1-kW isolated-output DC-DC converter operating from 800 V and supplying 48 V at a switching frequency of 60 kHz. Full-load efficiency was evaluated at 93.3% using a calorimeter.