using devices of a triode or transistor type requiring continuous application of a control signal

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 triode or transistor type requiring continuous application of a control signal

Child Classifications

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• H02M 5/29 using discharge tubes only
• H02M 5/293 using semiconductor devices only
• H02M 5/297 for conversion of frequency