Parasitic Mismatch Mitigation for Fast Switching Modular Power Semiconductor Devices

Nitish Jolly, Ayan Mallik

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

This paper centers around analyzing the impacts of device and circuit mismatches on paralleling the silicon carbide (SiC) MOSFETs in a high-frequency power converter. A multi-variable time dependent analytical model for the gate to source voltages (VGS) of paralleled devices is developed for a comprehensive theoretical analysis. Consequently, this paper reveals the design method for the gate resistors for mitigating the influences of device and circuit parasitic components that are inherently present in a group of paralleled MOSFETs. Furthermore, a real-time dead-time tracking, based on the parameters extracted from the derived gate-charge analytical model to prevent false triggering due to the coupling effect between two devices having ultra-high voltage slew rate (dv/dt) in the mismatched half-bridge module, is carried out in the digital signal processor (DSP) environment. Case-by-case study incorporating a single parasitic component at a time is simulated and presented to validate the design process derived from the multi-variable analytical model. Experimental results captured from a modular Non-Inverting Buck-Boost (NIBB) prototype validate the theoretical analysis corresponding to the gate driver design process of paralleled devices and the dead-time optimization to suppress false triggering in the mismatched half-bridge. Finally, the proposed mechanism is employed to guide the gate driver peripheral circuitry design for a 200W all-SiC based modular PWM converter proof-of-concept.

Original languageEnglish (US)
Pages (from-to)485-498
Number of pages14
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Volume71
Issue number1
DOIs
StatePublished - Jan 1 2024

Keywords

  • Non-inverting buck-boost
  • circuit parasitics
  • device paralleling
  • gate drive circuitry
  • silicon carbide

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Hardware and Architecture

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