PROJECT TITLE :
Experimental characterisation and performance evaluation of a coaxial current transformer for measurement of insulated gate bipolar transistor switching current
Measurement of device current throughout switching characterisation of an insulated gate bipolar transistor (IGBT) needs 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 higher than purpose. A prototype CCT, which can be mounted directly on an influence terminal of a 1200 V/50 A [*fr1]-bridge IGBT module, is characterised experimentally. The measured characteristics embody insertion impedance, gain and section of the CCT at different frequencies. The bounds of linearity at intervals which the CCT can operate while not saturation are determined theoretically, and are also verified experimentally. The experimental study on linearity of the CCT requires a high-amplitude current supply. A proportional–resonant (PR) controller-primarily based current-controlled half-bridge inverter is developed for this purpose. A systematic procedure for selection of PR controller parameters is also reported during this study. This set-up is useful to determine the limit of linearity and also to measure the frequency response of the CCT at realistic amplitudes of current within the low-frequency vary.
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