METHOD OF AND ELECTRIC CIRCUIT FOR CONVERTING ELECTRIC ENERGY Russian patent published in 2002 - IPC

FIELD: rail transport. SUBSTANCE: invention relates to electrical equipment of rail transport systems in which vehicles are supplied by dc or ac networks with different mains voltage. Multisystem conception is proposed suitable for use at insignificant switching operation and without excess power losses both for preset ac voltage, for instance, 15 kV, and for dc voltages of 1.5 kV and 3 kV normal for traction drives. For this purpose three-phase windings of motors, each consisting of several parts are shunt-operated irrespective to type of power supply network. EFFECT: enlarged sphere of application of rail transport systems with electric drive with possibility of use in different contact systems of different countries. 3 cl, 2 dwg