×

Non-contact electric power transmission apparatus

  • US 5,896,278 A
  • Filed: 02/24/1998
  • Issued: 04/20/1999
  • Est. Priority Date: 03/26/1997
  • Status: Expired due to Term
First Claim
Patent Images

1. A non-contact electric power transmission apparatus comprising:

  • a power supply unit, said power supply unit includinga first oscillation circuit adapted to be able to oscillate at a first oscillation frequency and having a power primary winding;

    a signal secondary winding;

    a filter circuit connected to said signal secondary winding and adapted to extract positioning signals from signals induced in said signal secondary winding; and

    a driving control circuit which controls said first oscillation circuit such that said first oscillation circuit intermittently oscillates when said driving control circuit does not receive said positioning signals from said filter circuit, and such that said first oscillation circuit successively oscillates when said driving control circuit receives said positioning signals from said filter circuit;

    a load unit, said load unit includinga power secondary winding;

    a signal primary winding, said power secondary winding and said signal primary winding being adapted to be electromagnetically connected to said power primary winding and said signal secondary winding respectively when said load unit is placed at a predetermined position with respect to said power supply unit; and

    a second oscillation circuit adapted to be able to oscillate at a second oscillation frequency different from said first oscillation frequency and adapted to output signals having said second oscillation frequency to said signal primary winding when signals are induced in said power secondary winding and input to said second oscillation circuit; and

    said filter circuit being adapted to extract signals having said second oscillation frequency as said positioning signals.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×