Experimental characterisation and performance evaluation of a coaxial current transformer for measurement of insulated gate bipolar transistor switching current

Ghosh, Saikat Subhra and Narayanan, Gopalaratnam (2015) Experimental characterisation and performance evaluation of a coaxial current transformer for measurement of insulated gate bipolar transistor switching current. In: IET SCIENCE MEASUREMENT & TECHNOLOGY, 9 (8). pp. 962-972.

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Abstract

Measurement of device current during switching characterisation of an insulated gate bipolar transistor (IGBT) requires a current sensor with low insertion impedance and high bandwidth. This study presents an experimental procedure for evaluating the performance of a coaxial current transformer (CCT), designed for the above purpose. A prototype CCT, which can be mounted directly on a power terminal of a 1200 V/50 A half-bridge IGBT module, is characterised experimentally. The measured characteristics include insertion impedance, gain and phase of the CCT at different frequencies. The bounds of linearity within which the CCT can operate without saturation are determined theoretically, and are also verified experimentally. The experimental study on linearity of the CCT requires a high-amplitude current source. A proportional-resonant (PR) controller-based current-controlled half-bridge inverter is developed for this purpose. A systematic procedure for selection of PR controller parameters is also reported in this study. This set-up is helpful to determine the limit of linearity and also to measure the frequency response of the CCT at realistic amplitudes of current in the low-frequency range.

Item Type:	Journal Article
Publication:	IET SCIENCE MEASUREMENT & TECHNOLOGY
Publisher:	INST ENGINEERING TECHNOLOGY-IET
Additional Information:	Copy right for this article belongs to the INST ENGINEERING TECHNOLOGY-IET, MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD SG1 2AY, ENGLAND
Keywords:	performance evaluation; insulated gate bipolar transistors; switched current circuits; current transformers; electric impedance; invertors; performance evaluation; coaxial current transformer; insulated gate bipolar transistor switching current measurement; current sensor; low insertion impedance; high bandwidth; half-bridge IGBT module; gain; phase; linearity; proportional-resonant controller-based current-controlled half-bridge inverter; voltage 1200 V; current 50 A
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	10 Dec 2015 06:02
Last Modified:	10 Dec 2015 06:02
URI:	http://eprints.iisc.ac.in/id/eprint/52877

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