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

Andrew Hopkins, Neville McNeill, William D. Drury, Andrew Atkins

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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.
Original languageEnglish
Number of pages8
Publication statusPublished - 30 Jun 2017
EventIEEE 26th International Symposium on Industrial Electronics -
Duration: 19 Jun 201721 Jun 2017


ConferenceIEEE 26th International Symposium on Industrial Electronics


  • automotive engineering
  • electric vehicles
  • hybrid vehicles
  • DC-DC
  • SiC BJT
  • SMPS
  • electrical

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