Method and apparatus for supplying contactless power

  • US 6,515,878 B1
  • Filed: 08/07/1998
  • Issued: 02/04/2003
  • Est. Priority Date: 08/08/1997
  • Status: Expired due to Term
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First Claim
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1. A contactless system to magnetically transfer electric power from an input power source to a first secondary load, comprising:

  • a primary energy converter connected to the input power source and including an output inverter;

    a primary inductive loop connected in series to the output inverter through at least one primary capacitor, the loop including at least one turn;

    a secondary power pickup unit magnetically coupled to the primary inductive loop, the secondary power pickup unit including a ferromagnetic core and at least two windings which are each distributed on the ferromagnetic core such that they are partly magnetically coupled and partly magnetically not coupled, the two windings each being partly compensated with a parallel capacitor;

    compensation circuitry that automatically and passively compensates the two windings to unity power factor and passively supplies in-phase power at a constant voltage to the first secondary load regardless of the magnitude of the first secondary load; and

    a secondary energy converter connected to the secondary power pickup unit through at least one secondary capacitor in parallel to the secondary power pickup unit, the secondary energy converter including an input converter and being connected to the first secondary load, the at least one primary capacitor and the at least one secondary capacitor being chosen so that the primary inductive loop and the secondary power pickup unit are tuned to resonance at a desired operating frequency, whereby the primary inductive loop and the secondary power pickup unit are magnetically coupled at a unity power factor.

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