NON-CONTACT POWER TRANSMISSION DEVICE AND NEAR-FIELD ANTENNA FOR SAME
First Claim
1. A non-contact power transmission device using magnetic field coupling in a near field, comprising:
- a transmission-side apparatus including at least a high-frequency AC power source and a near-field antenna and transmitting high-frequency power; and
a reception-side apparatus including at least a load and a near-field antenna and receiving the high-frequency power transmitted from the transmission-side apparatus,wherein the near-field antenna included in the transmission-side apparatus or in the reception-side apparatus includes;
a first inductor for resonance;
a first capacitor connected with the first inductor to adjust an oscillating frequency; and
a coupling means formed in a manner faradically isolated from a resonant circuit including the first inductor and the first capacitor, the coupling means supplying AC power from the high-frequency AC power source of the transmission-side apparatus to the resonant circuit including the first inductor and the first capacitor, the coupling means further supplying alternatively the high-frequency power received by the resonant circuit including the first inductor and the first capacitor to the load of the reception-side apparatus.
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Accused Products
Abstract
Disclosed is a structure for raising the Q-value of a near-field antenna used by a non-contact power transmission device that utilizes magnetic field coupling in the near field in a manner improving the efficiency of power transmission. The near-field antenna used by the non-contact power transmission device galvanically isolates a resonant circuit including a resonant first inductor 31 and a first capacitor 32 from a transmission circuit or a reception circuit and, through electromagnetic coupling or inductive coupling established between the transmission or reception circuit and the near-field antenna using a second inductor 33 or a second capacitor 34, maintains a high Q even if the coupling between the antennas weakens due to an extended distance the antennas.
39 Citations
16 Claims
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1. A non-contact power transmission device using magnetic field coupling in a near field, comprising:
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a transmission-side apparatus including at least a high-frequency AC power source and a near-field antenna and transmitting high-frequency power; and a reception-side apparatus including at least a load and a near-field antenna and receiving the high-frequency power transmitted from the transmission-side apparatus, wherein the near-field antenna included in the transmission-side apparatus or in the reception-side apparatus includes; a first inductor for resonance; a first capacitor connected with the first inductor to adjust an oscillating frequency; and a coupling means formed in a manner faradically isolated from a resonant circuit including the first inductor and the first capacitor, the coupling means supplying AC power from the high-frequency AC power source of the transmission-side apparatus to the resonant circuit including the first inductor and the first capacitor, the coupling means further supplying alternatively the high-frequency power received by the resonant circuit including the first inductor and the first capacitor to the load of the reception-side apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A near-field antenna included in a transmission-side apparatus or a reception-side apparatus of a non-contact power transmission device using magnetic field coupling in a near field, the near-field antenna comprising:
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a first inductor for resonance; a first capacitor connected with the first inductor to adjust an oscillating frequency; and a coupling means isolated faradically from a resonant circuit including the first inductor and the first capacitor, the coupling means supplying AC power from the outside to the resonant circuit including the first inductor and the first capacitor, the coupling means further supplying alternatively received high-frequency power to the outside. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification