A New High Frequency Cycloconverter

A new ac to ac frequency converter which uses three pairs of back-to-back thyristors, anid converts three-phase power frequency to a single-phase higher frequency, is introduced. 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 the load tank circuit through two thyristor switches in series. But in the system presented here, each pulse flows through either one switch or two parallel 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.