Three-Phase Motor Inverter and Current Sensing GaN Power IC-Reference-Cited by-同舟云学术

Three-Phase Motor Inverter and Current Sensing GaN Power IC

Published:2023-07-19 Issue:14 Volume:23 Page:6512
ISSN:1424-8220
Container-title:Sensors
language:en
Short-container-title:Sensors

Author:

Mönch Stefan¹^ORCID,Reiner Richard¹^ORCID,Basler Michael¹^ORCID,Grieshaber Daniel¹,Benkhelifa Fouad¹^ORCID,Waltereit Patrick¹,Quay Rüdiger¹²^ORCID

Affiliation:

1. Fraunhofer Institute for Applied Solid State Physics IAF, Tullastr. 72, 79108 Freiburg, Germany

2. Department of Sustainable Systems Engineering (INATECH), University of Freiburg, 79110 Freiburg, Germany

Abstract

A three-phase GaN-based motor inverter IC with three integrated phase current mirror sensors (sense-FETs or sense-HEMTs, 1200:1 ratio), a temperature sensor, and an amplifier is presented and experimentally operated. The three low-side currents are read out by virtual grounding transimpedance amplifiers. A modified summed DC current readout circuit using only one amplifier is also discussed. During continuous 24 V motor operation with space-vector pulse width modulation (SVPWM), the sensor signal is measured and a bidirectional measurement capability is verified. The measured risetime of the sensor signal is 51 ns, indicating around 7 MHz bandwidth (without intentional optimization for high bandwidth). The IC is operated up to 32 V on DC-biased semi-floating substrate to limit negative static back-gating of the high-side transistors to around −7% of the DC-link voltage. Analysis of the capacitive coupling from the three switch-nodes to the substrate is calculated for SVPWM based on capacitance measurement, resulting in four discrete semi-floating substrate voltage levels, which is experimentally verified. Integrated advanced power converter topologies with sensors improve the power density of power electronics applications, such as for low-voltage motor drive.

Funder

Vector Stiftung

Publisher

MDPI AG

Subject

Electrical and Electronic Engineering,Biochemistry,Instrumentation,Atomic and Molecular Physics, and Optics,Analytical Chemistry

Link

https://www.mdpi.com/1424-8220/23/14/6512/pdf

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