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An electrical drive apparatus, in particular, a motor-driven motor vehicle window winder or motor vehicle belt roller, which can be operated via a full bridge circuit with at least four switching elements with a different load depending on the rotation direction, wherein the switching elements are i

An electrical drive apparatus, in particular, a motor-driven motor vehicle window winder or motor vehicle belt roller, which can be operated via a full bridge circuit with at least four switching elements with a different load depending on the rotation direction, wherein the switching elements are individually designed on the basis of their different maximum loads, in the sense of an asymmetric full bridge.

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What is claimed is: 1. An electrical drive apparatus operable via a full bridge circuit comprising a full bridge circuit having at least first, second, third, and fourth bridge switches arranged to drive a load in two different directions, having a higher load during a first rotation direction and

What is claimed is: 1. An electrical drive apparatus operable via a full bridge circuit comprising a full bridge circuit having at least first, second, third, and fourth bridge switches arranged to drive a load in two different directions, having a higher load during a first rotation direction and a lower load in a second rotation direction which is the opposite direction of the first direction, said motor driven in two rotation directions via the bridge switches, ratings of said first, second, third, and fourth bridge switches are designed on the basis of their respective maximum loads in the sense of an asymmetric full bridge, wherein the first switch has a power rating of 100% of an assumed load current, the second switch has a power rating less than the assumed load current of the first switch, the third switch has a power rating less than the assumed load current of the second switch, and the fourth switch has a power rating less than the assumed load current of the third switch. 2. A drive apparatus as claimed in claim 1, comprising mechanical relay switches as the bridge switches. 3. A drive apparatus as claimed in claim 1, comprising electronic thyristor switches as the bridge switches. 4. A drive apparatus as claimed in claim 3, comprising electronic thyristor bridge switches which are clocked in the sense of the drive apparatus having a controllable speed. 5. A drive apparatus as claimed in claim 4, comprising a clock frequency, which is above 20 kHz for the clocked electronic bridge switches. 6. A drive apparatus as claimed in claim 4, wherein the maximum load on the respective bridge switches is determined by taking into account the actual load current in the bridge path which contains this bridge switch, and of a freewheeling current in the freewheeling branch which contains these bridge switch with clocked load current drive being determined via the other bridge arm. 7. A drive apparatus as claimed in claim 1, wherein said drive is adapted for a motor-driven window winder drive or belt roller drive for a motor vehicle. 8. A drive apparatus as claimed in claim 7, wherein the power rating for the second bridge switch is 75% of an assumed load current, the power rating for the third bridge switch is 50% of an assumed load current, the power rating for the fourth bridge switch is 25% of an assumed load current. 9. A drive apparatus as claimed in claim 1, wherein the rotation speed of the window winder drive motor or belt roller winding motor being controlled via the switching duty ratio of the bridge switches. 10. Switches for an electrical two-direction drive apparatus adapted for a motor-driven window winder drive or a belt roller drive for a motor vehicle, said apparatus operable via a full bridge circuit having at least first, second, third and fourth switches having ratings, wherein the rotation speed of the motor is controlled via a switching duty ratio of the switches, said switches having different loads in each drive direction and having a higher load during use in a first rotation direction and a lower load during use in a second rotation direction opposite the first rotational direction, the rating of each switch is designed on the basis of their respective maximum loads relative to an asymmetric full bridge, wherein the rating of the first switch is 100% of an assumed load current, the rating of the second switch is 75% of an assumed load current, the rating of the third switch is 50% of an assumed load current, and the rating of the fourth switch is 25% of an assumed load current. 11. Switches as claimed in claim 10, wherein said switches are relay switches. 12. Switches as claimed in claim 10, wherein said switches are thyristor switches. 13. Switches as claimed in claim 12, wherein the switches are clocked in the sense of the drive apparatus having a controllable speed. 14. Switches as claimed in claim 13, wherein the switches have a clock frequency greater than 20 kHz. 15. Switches as claimed in claim 13, wherein the maximum load is determined by taking into account the actual load current in the bridge path which contains a bridge switch, and of a freewheeling current in a freewheeling branch which contains the bridge switch with clocked load current drive being determined via another bridge arm. 16. An electrical drive apparatus assembly comprising, an electrical two-direction rotational motor, a full bridge circuit in electrical communication with said motor, said circuit comprising at least four switches, wherein the first switch has a power rating of 100% of an assumed load current, the second switch has a power rating less than the assumed load current of the first switch, the third switch has a power rating less than the assumed load current of the second switch, and the fourth switch has a power rating less than the assumed load current of the third switch. 17. The apparatus assembly of claim 16, wherein the power rating for the second, third, and fourth switches is 75%, 50%, and 25% of the assumed load current, respectively. 18. The apparatus assembly of claim 16, wherein one of the at least four switches is a thyristor switch. 19. The apparatus assembly of claim 16, wherein at least one of the four switches is clocked in the sense of the drive apparatus having a controllable speed. 20. The apparatus assembly of claim 16, wherein a switch has a clock frequency greater than 20 kHz. 21. The apparatus assembly of claim 16, wherein a maximum load is determined by taking into account the actual load current in the bridge path containing a bridge switch, and a freewheeling current in a freewheeling branch containing the bridge switch with clock load current drive being determined via another bridge arm. 22. The apparatus assembly of claim 16, wherein the bridge switches comprise mechanical switches. 23. The apparatus assembly of claim 16, wherein the bridge switches comprise electronic switches. 24. The apparatus assembly of claim 16, wherein the rotation speed of the motor is controlled via the switching duty ratio of the bridge switches.