H02M 5/14 for conversion between circuits of different phase number
Introduced: September 1968
Full Title
Full titles differ between systems:
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 > using transformers > for conversion between circuits of different phase number
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 transformers > for conversion between circuits of different phase number
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