Integrated All-GaN Driver for High-voltage DC-DC Power Converters

Chin Hsia*, Chung Yi Li, Deng Fong Lu, Tzu Yu Chen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

This article presents a high-voltage power converter based on an all-GaN half-bridge architecture, incorporating a novel pulse-charging bootstrap circuit. The proposed half-bridge using only E-mode and D-mode GaN transistors integrates the power switches and drivers on the same substrate to suppress parasitic effects and output ringing, thereby improving the overall performance of the converter. The high-side gate driver adopts the E-stacked/D/E-mode (EDE) architecture to directly drive the power transistor's gate with a low-voltage signal, without additional level shifters, simplifying design and reducing propagation delay. Moreover, the architecture exploits GaN's reverse-conducting property as an active diode to charge the bootstrap capacitor, mitigating excessive DC losses and improving overall efficiency. The low-side power transistor is driven by a stack of two D/E-mode devices, with a minimum gate drive voltage of -5 V, preventing false triggering when the low-side driver is turned off. The proposed fully integrated half-bridge is implemented in a 0.5 μm GaN process and simulated in Cadence Spectre in a buck power converter. For an input voltage above 400V, the half-bridge outputs a driving voltage with an operating frequency greater than 1 MHz and generates pulse waves with a rise time and fall time of 50.4 nsec and 52.6 nsec, respectively.

Original languageEnglish
Title of host publicationProceedings - International SoC Design Conference 2023, ISOCC 2023
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages175-176
Number of pages2
ISBN (Electronic)9798350327038
DOIs
StatePublished - 2023
Event20th International SoC Design Conference, ISOCC 2023 - Jeju, Korea, Republic of
Duration: 25 10 202328 10 2023

Publication series

NameProceedings - International SoC Design Conference 2023, ISOCC 2023

Conference

Conference20th International SoC Design Conference, ISOCC 2023
Country/TerritoryKorea, Republic of
CityJeju
Period25/10/2328/10/23

Bibliographical note

Publisher Copyright:
© 2023 IEEE.

Keywords

  • Bootstrap
  • DC-DC
  • Drivers
  • GaN
  • Power converter

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