ADJUSTABLE M-PHASE AC/AC VOLTAGE CHANGER Russian patent published in 1996 - IPC

FIELD: a c voltage and current regulation. SUBSTANCE: changer has booster power transformer and n additional booster power transformer sets, where n=1+4. Transformation ratio of each next booster power transformer of set is three times higher than that of preceding one. Each booster power transformer set has m primary and m secondary windings. Each primary lead is connected through bidirectional thyristor switch to input lead of same phase of device. Like-polarity leads of all primary phases in each booster power transformer set are interconnected through m-1 bidirectional thyristor switches introduced for the purpose. Secondary windings of respective phases of booster power transformer sets are interconnected in series and connected to power circuit between input and output leads of device. EFFECT: improved design. 1 dwg, 1 tbl