SINGLE-PHASE-TO-THREE-PHASE VOLTAGE CHANGER Russian patent published in 1996 - IPC

FIELD: electrical engineering. SUBSTANCE: first lead of single-phase line is connected to third output lead (third phase of load). Common-core leg carries inductance coils wound one over other; wending height of all coils is equal. Capacitor and resistor form RC circuit. Other capacitor is inserted between second lead of single-phase line and starting lead of third inductance coil. Finishing lead of third inductance coil is connected to first phase of load. First lead of single-phase line is connected either through respective switch or directly across RC circuit and through the latter it is connected to starting lead of first inductance coil via other switch. Finishing lead of first inductance coil is connected to starting lead of second inductance coil and also through respective switch or directly across second phase of load. Finishing lead of second inductance coil is connected with second lead of single-phase line either through respective switch or across it, and also with capacitor; third capacitor may be connected in parallel to the latter either through respective switch or across it. Coil may have intermediate tap connected through switch to second lead of single-phase line. proposed joint arrangement of three inductance coils in space on common core leg reduces magnetic leakage between them and voltage unbalance in three-phase system. EFFECT: improved reliability and conversion efficiency; improved characteristics of three-phase system voltage across three-phase terminals of loads within narrow and broad working range. 3 cl, 4 dwg