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Non-contact power transmitting device having simplified self-oscillation feedback loop which interrupts power transmission when no load is present

  • US 6,040,986 A
  • Filed: 11/27/1998
  • Issued: 03/21/2000
  • Est. Priority Date: 12/09/1997
  • Status: Expired due to Term
First Claim
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1. A non-contact power transmitting device comprising:

  • (A) a power supplying section comprising;

    a voltage source;

    a start resistor connected to said voltage source;

    a first capacitor connected to said voltage source;

    a power transmitting primary coil;

    a signal transmitting secondary coil which is not inductively coupled to said power transmitting primary coil; and

    a switching element having a control terminal, wherein, said start resistor and said first capacitor apply a bias voltage to said control terminal of said switching element, and when the bias voltage applied to said control terminal becomes higher than a threshold voltage, said switching element switches a current from said voltage source to said power transmitting primary coil; and

    (B) a load section comprising;

    a power transmitting secondary coil; and

    a signal transmitting primary coil being electrically and magnetically coupled to said power transmitting secondary coil,wherein, when said load section is attached to said power supplying section, said power transmitting primary coil and said power transmitting secondary coil are magnetically coupled to each other, so that power is transmitted from said power supplying section to said load section by electromagnetic induction,said signal transmitting secondary coil is magnetically coupled to said signal transmitting primary coil and electrically coupled to said control terminal as a feedback coil, andsaid power transmitting primary coil, said power transmitting secondary coil, said signal transmitting primary coil, and said signal transmitting secondary coil form a feedback loop.

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