DETERMINING POWER ELECTRONICS FEASIBILITY WITH SINGLE TURN MAGNETIC SIMULATION DATA

• US 20180080999A1
• Filed: 09/22/2016
• Published: 03/22/2018
• Est. Priority Date: 09/22/2016
• Status: Abandoned Application

• Current Assignee: WiTricity Corporation
• Original Assignee: Qualcomm, Inc.
• Inventors: Weidner, Felix, Chlebosz, Wojciech, Kuerschner, Daniel, Werner, Michael, Pavlovsky, Martin
• Application Number:
  US15/272,673
• Publication Number:
  US 20180080999A1
• Time in Patent Office: Days
• CPC Class Codes: G06F 2119/06 Power analysis or power optimisation
• CPC Class Codes: G06F 30/15 Vehicle, aircraft or watercraft design
• CPC Class Codes: G06F 30/23 using finite element methods [FEM] or finite difference methods [FDM]
• CPC Class Codes: H02J 50/12 of the resonant type

Abstract

Techniques for determining power electronics feasibility in a wireless power transfer system with a transmitting element and a receiving element are provided. An example apparatus includes a processor configured to receive FEM simulation results for offset positions between the transmitting element and the receiving element, calculate a total real input current variation for the offset positions based on the FEM simulation results, calculate an indication of a difference between an ideal transmitting element current value and a real transmitting element current value for each of the offset positions based on the FEM simulation results, determine a maximum difference value based on the indication of the difference for each of the offset positions, and determine the power electronics feasibility based on the total real input current variation as compared to a total real input current variation threshold value, and the maximum difference value as compared to a maximum difference threshold value.

Claims

1. An apparatus for determining a power electronics feasibility in a wireless power transfer system including a transmitting element and a receiving element, comprising:

at least one processor configured to;

receive Finite Element Method (FEM) simulation results for a plurality of offset positions between the transmitting element and the receiving element;

calculate a total real input current variation for the plurality of offset positions based on the FEM simulation results;

calculate an indication of a difference between an ideal transmitting element current value and a real transmitting element current value for each of the plurality of offset positions based on the FEM simulation results;

determine a maximum difference value based on the indication of the difference for each of the plurality of offset positions; and

determine the power electronics feasibility based on the total real input current variation as compared to a total real input current variation threshold value, and the maximum difference value as compared to a maximum difference threshold value.

2. The apparatus of claim 1 wherein the total real input current variation threshold value is between 2.0 and 2.5 and the maximum difference threshold value is a maximum percentage difference value between 10% and 20%.

3. The apparatus of claim 1 wherein the at least one processor is further configured to calculate ideal tuning capacitor values for a resonant frequency at each of the plurality of offset positions to calculate the indication of the difference between the ideal transmitting element current value and the real transmitting element current value for each of the plurality of offset positions.

4. The apparatus of claim 1 wherein the at least one processor is further configured to calculate real tuning capacitor values for a lowest coupling position to calculate the total real input current variation for the plurality of offset positions.

5. The apparatus of claim 1 wherein the FEM simulation results includes a coupling value, a transmitting element inductance value, a receiving element inductance value, and a receiving element current value for each of the plurality of offset positions.

6. The apparatus of claim 1 further comprising a data structure operably connected to the at least one processor.

7. The apparatus of claim 6 wherein the data structure comprises:

a first field containing data representing an offset position;

a second field containing data representing an ideal input current;

a third field containing data representing a real input current;

a fourth field containing data representing an ideal current through the transmitting element; and

a fifth field containing data representing a real current through the transmitting element.

8. A method for determining power electronics feasibility in a wireless power transfer system, comprising:

determining a plurality of offset positions between a transmitting element and a receiving element;

receiving Finite Element Method (FEM) simulation results for the plurality of offset positions between the transmitting element and the receiving element;

calculating a total real input current variation for the plurality of offset positions based on the FEM simulation results;

calculating a difference between an ideal transmitting element current value and a real transmitting element current value for each of the plurality of offset positions based on the FEM simulation results;

determining a maximum difference value based on the difference for each of the plurality of offset positions; and

determining power electronics feasibility based on the total real input current variation as compared to a total real input current variation threshold value, and the maximum difference value as compared to a maximum difference threshold value.

9. The method of claim 8 wherein the wireless power transfer system is configured to provide a power out of 6.6 kW.

10. The method of claim 9 wherein the total real input current variation threshold value is between 2.0 and 2.5 and the maximum difference threshold value is a maximum percentage difference value between 10% and 20%.

11. The method of claim 8 wherein calculating the difference between the ideal transmitting element current value and the real transmitting element current value for each of the plurality of offset positions includes calculating ideal tuning capacitor values for a resonant frequency at each of the plurality of offset positions.

12. The method of claim 8 wherein calculating the total real input current variation for the plurality of offset positions includes calculating real tuning capacitor values for a lowest coupling position, wherein the lowest coupling position is one of the plurality of offset positions with a lowest coupling value.

13. The method of claim 8 wherein the FEM simulation results includes a coupling value, a transmitting element inductance value, a receiving element inductance value, and a receiving element current value for each of the plurality of offset positions.

14. The method of claim 8 further comprising storing the total real input current variation and the maximum difference value in a data structure.

15. The method of claim 14 wherein storing the maximum difference value includes storing a maximum percentage difference value in the data structure.

16. An apparatus for determining a power electronics feasibility in a wireless power transfer system including a transmitting element and a receiving element, the apparatus comprising:

means for receiving Finite Element Method (FEM) simulation results for a plurality of offset positions between the transmitting element and the receiving element;

means for calculating a total real input current variation for the plurality of offset positions based on the FEM simulation results;

means for calculating an indication of a difference between an ideal transmitting element current value and a real transmitting element current value for each of the plurality of offset positions based on the FEM simulation results;

means for determining a maximum difference value based on the indication of the difference for each of the plurality of offset positions; and

means for determining the power electronics feasibility based on the total real input current variation as compared to a total real input current variation threshold value, and the maximum difference value as compared to a maximum difference threshold value.

17. The apparatus of claim 16 wherein the total real input current variation threshold value is between 2.0 and 2.5 and the maximum difference threshold value is a maximum percentage difference value between 10% and 20%.

18. The apparatus of claim 16 comprising means for calculating ideal tuning capacitor values for a resonant frequency at each of the plurality of offset positions to calculate the indication of the difference between the ideal transmitting element current value and the real transmitting element current value for each of the plurality of offset positions.

19. The apparatus of claim 16 comprising means for calculating real tuning capacitor values for a lowest coupling position to calculate the total real input current variation for the plurality of offset positions.

20. The apparatus of claim 16 wherein the FEM simulation results includes a coupling value, a transmitting element inductance value, a receiving element inductance value, and a receiving element current value for each of the plurality of offset positions.

21. The apparatus of claim 16 further comprising a data structure means for storing a power electronics feasibility data.

22. The apparatus of claim 21 wherein the data structure means comprises:

a first field containing data representing an offset position;

a second field containing data representing an ideal input current;

a third field containing data representing a real input current;

a fourth field containing data representing an ideal current through the transmitting element; and

a fifth field containing data representing a real current through the transmitting element.

23. A non-transitory processor-readable storage medium comprising processor-readable instructions configured to cause a processor to determine power electronics feasibility in a wireless power transfer system, comprising:

code for determining a plurality of offset positions between a transmitting element and a receiving element;

code for receiving Finite Element Method (FEM) simulation results for the plurality of offset positions between the transmitting element and the receiving element;

code for calculating a total real input current variation for the plurality of offset positions based on the FEM simulation results;

code for calculating a difference between an ideal transmitting element current value and a real transmitting element current value for each of the plurality of offset positions based on the FEM simulation results;

code for determining a maximum difference value based on the difference for each of the plurality of offset positions; and

code for determining the power electronics feasibility based on the total real input current variation as compared to a total real input current variation threshold value, and the maximum difference value as compared to a maximum difference threshold value.

24. The storage medium of claim 23 wherein the wireless power transfer system is configured to provide a power out of 6.6 kW.

25. The storage medium of claim 24 wherein the total real input current variation threshold value is between 2.0 and 2.5 and the maximum difference threshold value is a maximum percentage difference value between 10% and 20%.

26. The storage medium of claim 23 wherein the code for calculating the difference between the ideal transmitting element current value and the real transmitting element current value for each of the plurality of offset positions includes code for calculating ideal tuning capacitor values for a resonant frequency at each of the plurality of offset positions.

27. The storage medium of claim 23 wherein the code for calculating the total real input current variation for the plurality of offset positions includes code for calculating real tuning capacitor values for a lowest coupling position, wherein the lowest coupling position is one of the plurality of offset positions with a lowest coupling value.

28. The storage medium of claim 23 wherein the FEM simulation results includes a coupling value, a transmitting element inductance value, a receiving element inductance value, and a receiving element current value for each of the plurality of offset positions.

29. The storage medium of claim 23 further comprising code for storing the total real input current variation and the maximum difference value in a data structure.

30. The storage medium of claim 29 wherein the code for storing the maximum difference value includes code for storing a maximum percentage difference value in the data structure.