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Non-contact electrical power transmission system having function of making load voltage constant

  • US 20010017781A1
  • Filed: 02/26/2001
  • Published: 08/30/2001
  • Est. Priority Date: 02/24/2000
  • Status: Active Grant
First Claim
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1. A non-contact electrical power transmission system comprising:

  • a transformer separable/detachable between a primary winding and a secondary winding;

    a capacitor connected in parallel with said secondary winding of said transformer;

    an output terminal on said secondary winding side;

    said output terminal being connectable to a load;

    a high-frequency AC voltage supplied to said primary winding induces an induction voltage to be generated on the secondary winding by the electromagnetic induction action, whereby an electrical power is supplied to a load connected to said output terminal;

    said voltage supplied to said load is substantially constant either while said load current varies, or said load varies;

    in a first condition, at a time of a maximum load (load current Imax), the time of the reversal of the voltage polarity of said primary winding substantially coincides with a time when an oscillating voltage of said capacitor reaches at least one of a maximum or minimum value;

    in a second condition, at a time of a minimum load (load current Imin), the time of the reversal of the voltage polarity of said primary winding substantially coincides with the time when the oscillating voltage of said capacitor completes one cycle; and

    a capacitance of said capacitor is set to satisfy simultaneously said first and second conditions, thereby making substantially constant the load voltage in a load current range from Imin to Imax.

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