A new high frequency cycloconverter

A new AC to AC frequency converter which uses three pairs of back-to-back thyristors, and converts three-phase power frequency to a single-phase higher frequency, is introduced in this paper. In the same type of converters made public recently, which use two six-pulse fully-controlled bridge rectifiers, high frequency current pulses must be fed to load tank circuit through two thyristor switches in series. But in the system presented here, each pulse flows through either one switch or parallel two switches, so that it is expected to provide good efficiency with the advantage of a small parts count. Features inherent in this type of converter such as stable operation, high power factor and low harmonics are also maintained. The operation of the circuit along with circuit parameter requirements are described using a simplified model of the converter.