Control of inductive power transfer pickups

  • US 6,483,202 B1
  • Filed: 07/24/2000
  • Issued: 11/19/2002
  • Est. Priority Date: 11/17/1997
  • Status: Expired due to Fees
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First Claim
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1. An apparatus for controlling an inductive power transfer pickup for use in a loosely coupled inductive power transfer system, the pickup collecting power in the form of a current source from a magnetic flux surrounding a primary conductor upon energizing the primary conductor with alternating current at a system frequency, wherein the pickup comprises means for controlling an output voltage or output current at a value above a working range of said output voltage or output current, for safety purposes, and wherein the pickup is a resonant circuit which is resonant at the system frequency, wherein the pickup comprises passive means for limiting the amount of a resonating current circulating in said pickup at less than a predetermined maximum amount, said passive means comprising at least one saturable inductor having a core, wherein at least a portion of the at least one saturable inductor exhibits an onset of saturation within the core at or above a selected current so that the onset of saturation within the core changes the resonant frequency of the pickup and so causes the tuning of the pickup to deviate from the system frequency, thereby reducing the effectiveness of the collection of power and so causing the amount of the current entering the resonant circuit to be reduced.

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