Line Commutation of Thyristor
Line commutation is also called Class-F commutation or natural commutation of thyristor. Line commutation of thyristor is used in ac voltage controllers, phase-controlled rectifiers, and step-down cyclo converters. Line commutation occurs only when converter circuits are fed from 1-phase or 3-phase supply. A circuit diagram of the line commutation of the thyristor is given in Fig. 1. Waveform showing input voltage, output voltage, output current, and thyristor voltage for line commutation of the thyristor is given in Fig. 2.
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| Fig. 1 Circuit diagram of line commutation of thyristor |
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| Fig. 2 Waveform of line commutation of thyristor |
When line voltage complete positive cycle and start negative cycle, thyristor becomes reverse biased and switch off naturally.
Reference
Dr. P. S. Bimbhra, "Power Electronics", Khanna Publishers, Fifth Edition, 2013.
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authored 77+ Technical Articles for INFO4EEE Website since 2012.
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