Importance

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Abstract

A multi-phase inverter comprising a bridged array of thyristors periodically fired in sequence by a source of firing pulses has a circuit arrangement for controlling each extinction angle (.gamma.) of the thyristors individually. Said circuit arrangement comprises an adder for summing .gamma. signals and adder for differencing said sums to generate an error signal and, said error signal being applied to said source of firing pulses at appropriate phase angles to appropriate thyristors so as to tend to equalize said sums, the number of pairs of differenced sums being equal to the number of thyristors in the array. Preferably each error signal acts as a constant multiplier of a correction signal which is a harmonic of the A.C. output frequency of the inverter. The arrangement improves the efficiency by enabling each .gamma. to be minimized individually without risk of commutation failure.

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First Claim