Design of a 1 kV bidirectional DC-DC converter with 650 v GaN transistors

Andrew Stillwell, Margaret E. Blackwell, Robert C.N. Pilawa-Podgurski

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper presents a bidirectional 4-level flying capacitor multi-level (FCML) converter for high voltage (> 1 kV) step-down/step-up conversion needed in hybrid rail and electric vehicle applications. Previous work achieved similar input voltage requirements through increasing the number of levels in the FCML, at the cost of additional transistors, flying capacitors and control complexity. In this work, we investigate the application of 650 V GaN transistors and apply a cascaded bootstrap method to supply the isolated gate drivers. We also analyze the performance benefits and limitations of zero-voltage switching (ZVS) in FCML converters. The design employs a single-sided PCB to improve the design flexibility for backside heat sinking. We demonstrate the design with an experimental prototype that achieves up to 1 kV operation at 2 kW with excellent flying capacitor balancing, a peak efficiency of 98.4% and a power density of 1500 W/in3.

Original languageEnglish (US)
Title of host publicationAPEC 2018 - 33rd Annual IEEE Applied Power Electronics Conference and Exposition
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1155-1162
Number of pages8
ISBN (Electronic)9781538611807
DOIs
StatePublished - Apr 18 2018
Event33rd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2018 - San Antonio, United States
Duration: Mar 4 2018Mar 8 2018

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
Volume2018-March

Other

Other33rd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2018
CountryUnited States
CitySan Antonio
Period3/4/183/8/18

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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