Patent ID: 8723440

Claim:
AC voltage conversion and switching device comprising a main circuit and a switching circuit, the device has a first input and a second input both connected to the power supply, a first output and second output connected to the consumer, in the main circuit a transformer (T) operated by controlled switches is inserted, the secondary coil ( 6 , 26 , 36 ) of the transformer (T) being the main circuit is connected in series between the input ( 8 , 28 , 38 , 6 , 78 ) and the output ( 10 , 210 , 310 , 610 , 710 ) for decreasing the voltage at the consumer (F) during operation, and the secondary coil ( 6 ) of the transformer (T) is bridged by a first controlled switch ( 12 , 212 , 312 , 612 , 712 ) being the main switch, whereas the primary coil ( 7 , 27 , 37 , 67 , 77 ) of the transformer (T) forming the switching coil is connected in series with a second controlled switch ( 18 , 218 , 318 , 618 , 718 ), and the serial circuit formed by the primary coil ( 7 , 27 , 37 , 67 , 77 ) and the second controlled switch ( 18 , 218 , 318 , 618 , 718 ) is connected parallel with the consumer (F), the switches ( 12 , 212 , 312 , 612 , 712 ; 18 , 218 , 318 , 618 , 718 ) are in an operational connection with a central control unit (K) characterized in that the primary coil ( 7 , 27 , 37 ) is provided with at least one tap ( 25 , 225 , 325 ) and the tap(s) is (are) connected to the common point of the input ( 9 , 29 , 39 ) and the output ( 11 , 21 , 32 ) via voltage adjusting switches ( 15 , 215 , 315 ) connected in series further on the transformer used is a toroidal transformer, and the thickness of the turns in the secondary coil, are larger preferably by 20%.