Circuit arrangement for supplying variable loads from three phases

1. A circuit arrangement for supplying variable loads (I 1 , I 2 , M 1 , M 2 , O 1 , O 2 , O 3 ) from three phases (L 1 , L 2 , L 3 ), comprising

a circuit arrangement including four groups of terminals (A 11 , A 12 , A 13 , A 14 ; A 21 , A 22 , A 23 , A 24 ; A 31 , A 32 ; A 41 , A 42 , A 43 ) for loads (I 1 , I 2 , M 1 , M 2 , O 1 , O 2 , O 3 ), the loads are subsequently designated as terminal groups;

the circuit arrangement is capable of supplying the terminals (A 21 , A 22 , A 23 , A 24 ) of the second terminal group from the first phase (L 1 );

the circuit arrangement is capable of supplying the terminals (A 41 , A 42 , A 43 ) of the fourth terminal group from a second phase (L 2 );

the circuit arrangement is capable of supplying the terminals (A 11 , A 12 , A 13 ) of the first terminal group and the third terminal group (A 31 , A 32 ) from a third phase (L 3 );

the circuit arrangement capable of controlling the voltage of the four terminal groups,

wherein

a first control loop is allocated to the first terminal group and the first control loop comprises a first controller and a first group of controllable switches (S 111 to S 132 ) for setting the voltage as actuators, which is subsequently designated as first group of switches,

a second control loop is allocated to the second terminal group and the second control loop comprises a second controller and a second group of controllable switches (S 211 to S 231 ) for setting the voltage as actuators which is subsequently designated as second group of switches,

a common third control loop is allocated to the third terminal group and the fourth terminal group and the third control loop comprises a third controller and a third group of controllable switches (S 311 to S 345 ) for setting the voltage as actuators, which is subsequently designated as third group of switches.

2. The circuit arrangement according to claim 1 , wherein the controllable switches (S 111 to S 345 ) are thyristors.

3. The circuit arrangement according to claim 2 , wherein the first group of switches (S 111 to 132 ) is capable of alternating between a parallel supply and a series supply of the loads (I 1 , I 2 ) which can be connected to the first terminal group.

4. The circuit arrangement according to claim 2 , wherein the second group of switches (S 211 to S 232 ) is suitable and set up for alternating between a parallel supply and a series supply of the loads (M 1 , M 2 ) which can be connected to the second terminal group.

5. The circuit arrangement according to claim 2 wherein the third group of switches (S 311 to S 345 ) is suitable and set up for alternating between a parallel supply and a series supply of the loads (O 1 , O 2 , O 3 ) which can be connected to the third and the fourth terminal group.

6. The circuit arrangement according to claim 2 , wherein the switches of the first group of switches are suitable and set up for switching currents from the third phase (L 3 ).

7. The circuit arrangement according to claim 2 , wherein the switches of the second group of switches are suitable and set up for switching currents from the first phase (L 1 ).

8. The circuit arrangement according to claim 2 , wherein a first subgroup of switches (S 311 to S 331 ) of the third group of switches is suitable and set up for switching currents from the second phase (L 2 ).

9. The circuit arrangement according to claim 2 , wherein a second subgroup of switches (S 341 to S 345 ) of the third group of switches is suitable and set up for switching currents from the third phase (L 3 ).

10. The circuit arrangement according to claim 9 , wherein the lowest voltage, which can be set by the switches of the first group of switches (S 111 to S 132 ) or the second subgroup (S 341 to S 345 ) of the third group of switches is half as large as the voltage which can be set by the switches of the second group (S 211 to S 232 ) and the first subgroup (S 311 to S 331 ) of the third group of switches.

11. An arrangement of a circuit arrangement according to claim 1 and variable loads (I 1 , I 2 , M 1 , M 2 , O 1 , O 2 , O 3 ), wherein

a first group (I 1 , I 2 ) of the loads (I 1 , I 2 , M 1 , M 2 , O 1 , O 2 , O 3 ) is connected to the terminals (A 11 , Al 2 , A 13 , A 14 ) of the first terminal group,

a second group (M 1 , M 2 ) of the loads (I 1 , I 2 , M 1 , M 2 , O 1 , O 2 , O 3 ) is connected to the terminals (A 21 , A 22 , A 23 , A 24 ) of the second terminal group, and

a third group (O 1 , O 2 , O 3 ) of the loads (I 1 , I 2 , M 1 , M 2 , O 1 , O 2 , O 3 ) is connected to the terminals (A 31 , A 32 ) of the third terminal group and the terminals (A 41 , A 42 , A 43 ) of the fourth terminal group.

12. The arrangement according to claim 11 , wherein the resistance of the loads (M 1 , M 2 ; O 1 , O 2 ) connected to the second and the fourth terminal group is equally large.

13. The arrangement according to claim 12 , wherein the resistance of the loads (I 1 , I 2 ; O 3 ) connected to the first and the third terminal group is equally large.

14. The arrangement according to claim 12 , wherein the total resistance of the loads (I 1 , I 2 ; O 3 ) connected to the first and the third terminal group is equal to the resistance of the loads (M 1 , M 2 ; O 1 , O 2 ) connected to the second or the fourth terminal group.

15. The arrangement according to claim 13 , wherein the total resistance of the loads (I 1 , I 2 ; O 3 ) connected to the first and the third terminal group is equal to the resistance of the loads (M 1 , M 2 ; O 1 , O 2 ) connected to the second or the fourth terminal group.