using devices of a thyratron or thyristor type requiring extinguishing means

Full Title

Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases > without intermediate conversion into DC > by static converters (controlling transformers, reactors or choke coils, e.g. by tap changing H02P13/00) > using discharge tubes with control electrode or semiconductor devices with control electrode > using devices of a thyratron or thyristor type requiring extinguishing means

Child Classifications

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• H02M 5/253 using discharge tubes only
• H02M 5/257 using semiconductor devices only
• H02M 5/27 for conversion of frequency