Patent ID: 8675330

Claim:
A three-phase power amplifier for driving at least one load with first, second, and third wires ( 210 , 211 , 212 ; 410 , 411 , 412 ; 510 , 511 , 512 ), which can be connected on the input side to a three-phase power supply device, characterized in that at least one controllable switch contact ( 231 , 232 , 242 ; 451 , 431 , 432 ; 520 , 531 , 532 ) is allocated to each wire for opening and closing each wire, wherein at least two of the switch contacts are driven independently of each other, wherein a reversing switch device 280 ; 460 is provided, which is connected between two wires and which contains two second switch elements ( 290 , 295 ,; 470 , 475 ), which can be controlled independently of each other and which each have a first and second switch contact, wherein the first switch contacts ( 291 , 296 ; 471 , 476 ) of the second switch elements ( 290 , 295 ; 470 , 475 ) are connected to one wire ( 210 ; 411 ) and the second switch contacts ( 292 , 297 ; 472 , 477 ) of the second switch elements ( 290 , 295 ; 470 , 475 ) are connected to the other wire ( 212 ; 412 ), and wherein the current flow through the two wires ( 210 , 212 ; 411 , 412 ) is blocked in a predetermined position of the first and second switch contacts, wherein the first switch contacts ( 471 , 476 ) of the second switch elements ( 470 , 475 ) are connected to the second wire ( 411 ) and the second switch contacts ( 472 , 477 ) of the second switch elements ( 470 , 475 ) are connected to the third wire ( 412 ), wherein a third switch element ( 450 ) with at least two switch contacts ( 451 , 452 ) is connected to the first wire ( 410 ) wherein the first switch contacts ( 291 , 296 ) of the two second switch elements ( 290 , 295 ) of the reversing switch device ( 280 ) are connected to the first wire ( 210 ) and the second switch contacts ( 292 , 297 ) of the two second switch elements ( 290 , 295 ) are connected to the third wire ( 212 ), wherein a third switch element ( 230 ) with a first and second switch contact ( 231 , 232 ) is provided, wherein the first switch contact ( 231 ) is connected to the first wire ( 210 ) and the second switch contact ( 232 ) is connected to the second wire ( 211 ).