Noncontact Electric Power Transmission System

  • US 20100219696A1
  • Filed: 02/19/2010
  • Published: 09/02/2010
  • Est. Priority Date: 02/27/2009
  • Status: Active Grant
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First Claim
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1. A noncontact electric power transmission system having a power transmitter circuit section and a power receiver circuit section which are adapted to be coupled to transmit electric power from a transmitter coil provided in the power transmitter circuit section to a receiver coil provided in the power receiver circuit section, in a noncontact manner by means of electromagnetic induction, the noncontact electric power transmission system comprising:

  • a separately-excited or self-excited switching circuit provided in the power transmitter circuit section;

    a control IC operable to drive the switching circuit;

    an LC series resonant circuit including a capacitor connected in series to the transmitter coil or an LC parallel resonant circuit including a capacitor connected in parallel to the transmitter coil; and

    an LC parallel resonant circuit including a capacitor connected in parallel to the receiver coil, wherein an oscillating frequency (Fosc) of the control IC, a resonant frequency (Fpr) of the LC series resonant circuit or the LC parallel resonant circuit in the power transmitter circuit section, and a resonant frequency (Fsr) of the LC parallel resonant circuit in the power receiver circuit section, have the following relationship;

    Fpr<

    Fosc<

    Fsr.

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