SEMICONDUCTOR DEVICE OF CAPACITOR-FREE START-UP OF THREE-PHASE ELECTRIC MOTOR FROM SINGLE-PHASE GRID Russian patent published in 2010 - IPC H02P1/26 H02M5/257 

FIELD: electric engineering.

SUBSTANCE: as semiconducting switch intended for short-circuiting of one of stator windings of motor when stator windings are connected as delta, two reversible semiconducting switchboards are used, every of which comprises two opposite connected transistors. In the first reversible semiconducting switchboard, collector of the first transistor is connected to emitter of the second transistor and connected to phase of supply grid, and emitter of the first transistor is connected to collector of the second transistor and to outputs of the first and second stator windings, and their common output is intended for connection to phase of supply grid. In the second reversible semiconducting switchboard, collector of the third transistor is connected to emitter of the fourth transistor, and their common output is intended for connection to phase of supply grid, and emitter of the third transistor is connected to collector of the fourth transistor, and their common output is intended for connection of outputs of the second and third stators windings. Common output of the first and third windings is connected to zero of single-phase grid.

EFFECT: increasing reliability and efficiency of device, reduction of its dimensions.

3 dwg