A Delta-Sigma Modulated Multi-MHz GaN Half-Bridge featuring Zero-Voltage Switching and Blanking Time Compensation

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Abstract

This paper proposes a method to control a soft-switching gallium-nitride (GaN) based half-bridge with a delta-sigma (ΔΣ) modulator at multi-megahertz switching frequencies. A GaN-based High Electron Mobility Transistor (HEMT) can be operated at very high switching frequencies. However operating at these switching frequencies can be challenging as pulse-width modulators have several drawbacks when requiring zero-voltage switching with a variable switching frequency. Therefore a ΔΣ-modulator is extended to support zero-voltage switching operation for the entire output range. Also a compensation scheme is implemented that reduces the output voltage distortion due to blanking time. As a result of the proposed ΔΣ modulation scheme, the switching frequency automatically varies to minimize the inductor current ripple. The proposed method is validated in simulation including system non-idealities. Additionally the converter switching frequency range and zero-voltage switching behavior of the half-bridge is analyzed. Results show an improvement up to 14dB in output voltage distortion compared to the same PWM modulated converter with a constant switching frequency. Besides, the PWM modulated converter is not continuously soft-switching and has unnecessarily large inductor current ripple especially at small modulation indices.

Original languageEnglish
Title of host publication2021 IEEE 12th Energy Conversion Congress & Exposition - Asia (ECCE-Asia)
PublisherInstitute of Electrical and Electronics Engineers
Pages1638-1643
Number of pages6
ISBN (Electronic)9781728163444
DOIs
Publication statusPublished - 13 Jul 2021
Event12th Annual Energy Conversion Congress and Exposition (ECCE-Asia 2021) - Singapore, Singapore
Duration: 24 May 202127 May 2021
Conference number: 12
https://ecceasia2021.com/

Conference

Conference12th Annual Energy Conversion Congress and Exposition (ECCE-Asia 2021)
Abbreviated titleECCE 2021
Country/TerritorySingapore
CitySingapore
Period24/05/2127/05/21
Internet address

Keywords

  • Blanking Time Distortion
  • Delta-Sigma Modulation
  • Gallium Nitride (GaN)
  • High Frequency Power Converter
  • Zero-Voltage Switching

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