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CONTACTLESS POWER-FEED EQUIPMENT

  • US 20120068552A1
  • Filed: 06/17/2010
  • Published: 03/22/2012
  • Est. Priority Date: 06/18/2009
  • Status: Active Grant
First Claim
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1. Contactless power-feed equipment comprising an induction line placed along a travel path of a movable body and fed with an AC current, or an induction coil that is disposed at a predetermined position for holding a device and fed with an AC current,the movable body including a power-receiving coil on which an electromotive force is induced by a magnetic flux generated on the induction line, or the device including a power-receiving coil on which an electromotive force is induced by a magnetic flux generated on the induction coil,the contactless power-feed equipment comprising:

  • a DC power-supply device that supplies a DC current;

    a DC choke having one end connected to a positive output terminal of the DC power-supply device;

    an insulating transformer including a center-tapped primary coil having a center tap connected to another end of the DC choke and a secondary coil connected to one of the induction line and the induction coil;

    a resonance capacitor that is connected in parallel with the secondary coil and forms a resonance circuit with one of the induction line and the induction coil at a predetermined frequency;

    a first diode having an anode connected to one end of the center-tapped primary coil;

    a second diode having an anode connected to another end of the center-tapped primary coil;

    a first switching element including a transistor connected between a cathode of the first diode and a negative output terminal of the DC power-supply device;

    a second switching element including a transistor connected between a cathode of the second diode and the negative output terminal of the DC power-supply device;

    a first Zener diode having a cathode connected to the one end of the center-tapped primary coil and a base of the transistor forming the second switching element and an anode connected to the negative output terminal of the DC power-supply device; and

    a second Zener diode having a cathode connected to the other end of the center-tapped primary coil and a base of the transistor forming the first switching element and an anode connected to the negative output terminal of the DC power-supply device,wherein a current passing through the first Zener diode from the one end of the center-tapped primary coil drives the transistor forming the second switching element, a current passing through the second Zener diode from the other end of the center-tapped primary coil drives the transistor forming the first switching element, and the transistor forming the first switching element and the transistor forming the second switching element are alternately driven so as to pass the AC current through the secondary coil at the predetermined frequency.

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