POWER DEMAND MANAGEMENT IN INDUCTIVE POWER TRANSFER SYSTEMS
First Claim
1. A method of controlling power delivered to one or more loads in an inductive power transfer (IPT) system having a primary conductive path and one or more pick-up devices adapted to receive power inductively from the primary conductive path, the method comprising:
- varying a frequency of a current in the primary conductive path;
detecting a frequency or an indication of the frequency in a pick-up inductively coupled with the primary conductive path; and
controlling power supplied to a load associated with said pickup dependent on the detected frequency or the indication of the frequency of the current in the primary conductive path.
4 Assignments
0 Petitions
Accused Products
Abstract
A method of controlling power delivered to one or more loads in an inductive power transfer (IPT) system includes varying a frequency of a current in a primary conductive path (109), detecting the frequency in a pick-up inductively coupled with the primary conductive path (109), and controlling the power supplied to a load (207) associated with the pickup dependent on the detected frequency of the current in the primary conductive path (109). The frequency of the current is determined by is determined by either or both the load on a power supply (104) of the IPT system or the load on an electricity supply network supplying the power supply (104).
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Citations
40 Claims
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1. A method of controlling power delivered to one or more loads in an inductive power transfer (IPT) system having a primary conductive path and one or more pick-up devices adapted to receive power inductively from the primary conductive path, the method comprising:
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varying a frequency of a current in the primary conductive path; detecting a frequency or an indication of the frequency in a pick-up inductively coupled with the primary conductive path; and controlling power supplied to a load associated with said pickup dependent on the detected frequency or the indication of the frequency of the current in the primary conductive path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 33)
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11. An inductive power transfer (IPT) system having a primary conductive path and one or more pick-up devices adapted to receive power inductively from the primary conductive path, the system comprising:
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frequency varying means to vary a frequency of a current in the primary conductive path; detection means to detect the frequency or an indication of the frequency in a pick-up inductively coupled with the primary conductive path; and control means to control power supplied to a load associated with said pickup dependent on the detected frequency or the indication of the frequency of the current in the primary conductive path. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 34)
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21. An IPT pick-up circuit, comprising:
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detection means to detect a frequency of a current in a primary conductive path with which a pick-up may, in use, be inductively coupled; and control means to control output power of the pick-up dependent on the detected frequency. - View Dependent Claims (22, 23, 24, 25)
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26. An IPT pick-up circuit, comprising:
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a pick-up coil for inductive coupling with a primary conductive path of an IPT system; a frequency detector adapted to indirectly measure a frequency of an alternating current in the primary conductive path; and a power controller coupled with the pick-up coil and the frequency detector, wherein the power controller is adapted to vary a power output of the pick-up circuit in response to variations in the frequency measured by the frequency detector.
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27. (canceled)
- 28. An IPT system power supply for supplying current to a primary conductive path of an IPT system, the power supply comprising frequency varying means to vary a frequency of a current in the primary conductive path whereby the frequency of the current is determined by power available.
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30. An IPT system power supply comprising:
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a three-phase input for receiving power from an utility supply network at a utility supply frequency; a frequency detector for measuring the utility supply frequency; and an inverter to provide an alternating current to a primary conductive path of the IPT system at an operating frequency greater than the utility supply frequency, the inverter being further adapted to adjust the operating frequency in response to variations in the utility supply network. - View Dependent Claims (31, 32)
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35. A method of controlling power delivered to one or more loads in an inductive power transfer (IPT) system comprising:
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providing an indication of a utility supply frequency or power supply frequency to a pick-up circuit; and using the indication to control power output of the pick-up circuit. - View Dependent Claims (36)
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37. (canceled)
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38. (canceled)
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39. (canceled)
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40. (canceled)
Specification