Force commutation static frequency changer apparatus using direct capacitor commutation

摘要

An improved force commutated cycloconverter is provided by alternatively switching a capacitor to different groups of main thyristors including a thyristor to be commutated in the controlled sequence of thyristor conductions. The capacitor swing back to an opposite polarity before each successive commutation. Commutation is made possible at low load current by the adjunction of a resonant reset circuit. The force commutating circuit is applied to various configurations of cycloconverters.