A Closed-Loop Current Source Gate Driver with Active Voltage Balancing Control for Series-Connected GaN HEMTs

Zhengda Zhang, Chunhui Liu, Yunpeng Si, Yifu Liu, Mengzhi Wang, Qin Lei

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

Abstract

The voltage rating of the commercial Gallium Ni-tride (GaN) power devices are limited to 600/650 V due to the lateral structure. Stacking the low-voltage rating devices is a straightforward approach to block higher dc-link voltage. However, the unbalanced voltage sharing can occur due to the discrepancies in the gate driving loops, the device parameter tolerance and the device-to-ground displacement currents for the series-connected devices in the stack. In this paper, a novel closed-loop current source gate driver is proposed, which addresses the voltage imbalance issue of series-connected GaN HEMTs for both hard switching and soft switching scenarios. The proposed current source gate driver controls the device switching timing and the dv/dt with fine accuracy by directly regulating the device gate current. Without the employment of the lossy snubber circuit or the external Miller capacitor, the switching energy and the switching speed are almost not compromised for each individual device. Meanwhile, the closed-loop strategy improves the adaptivity to different operating conditions. A series-connected GaN-based multiple pulse tester is built to validate the proposed current source gate driver and the voltage balancing strategies in different switching scenarios.

Original languageEnglish (US)
Title of host publication2021 IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages5372-5379
Number of pages8
ISBN (Electronic)9781728151359
DOIs
StatePublished - 2021
Externally publishedYes
Event13th IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Virtual, Online, Canada
Duration: Oct 10 2021Oct 14 2021

Publication series

Name2021 IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Proceedings

Conference

Conference13th IEEE Energy Conversion Congress and Exposition, ECCE 2021
Country/TerritoryCanada
CityVirtual, Online
Period10/10/2110/14/21

Keywords

  • Gallium nitride
  • HEMTs
  • closed-loop
  • current control
  • driver circuits
  • parasitic capacitance
  • stacking
  • switching loss

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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