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Inductively powered mobile sensor system

  • US 10,069,341 B2
  • Filed: 03/05/2015
  • Issued: 09/04/2018
  • Est. Priority Date: 08/21/2007
  • Status: Active Grant
First Claim
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1. An inductive power transfer system, the system comprising:

  • a primary conductive path capable of being energized to provide an electromagnetic field in a volume;

    an inductive power pick-up associated with a device, the pick-up being capable of receiving power available from the field to supply power to the device when located in the volume;

    a sensing circuit operable to sense instantaneous power requirements by the device; and

    a controller for varying the power available to the pick-up and operable to vary at least one of a magnetic flux density of the field and a frequency of oscillation of the field in response to the sensed instantaneous power requirements by the device to thereby enable the pick-up to not supply power in excess of that required by the device,wherein the primary conductive path comprises a plurality of primary coils, andwherein the controller is operable to further control a vector of the field within the volume by controlling a relative magnetic flux density in at least two of the primary coils.

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