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POWER TRANSMISSION APPARATUS AND WIRELESS POWER TRANSMISSION SYSTEM

  • US 20150115728A1
  • Filed: 10/23/2014
  • Published: 04/30/2015
  • Est. Priority Date: 10/28/2013
  • Status: Active Grant
First Claim
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1. A power transmission apparatus for transmitting power to a power reception apparatus including a power reception coil in a non-contact manner, comprising:

  • a power transmission coil that is disposed within the power transmission apparatus opposite an installation surface of the power transmission apparatus, the power reception apparatus being installed on the installation surface, the power transmission apparatus being capable of being electromagnetically coupled with the power reception coil;

    at least one position detection coil that is disposed between the installation surface and the power transmission coil and that detects a signal from the power reception coil of the power reception apparatus installed on the installation surface;

    a position detection circuit that determines that the power reception apparatus is installed on the installation surface if a voltage or a current of the signal detected via the at least one position detection coil is smaller than a reference value;

    a reception circuit that demodulates into a data signal a wireless signal transmitted from the power reception apparatus to the power transmission apparatus via the at least one position detection coil;

    a switch circuit that switches between first electrical connection of the at least one position detection coil to the position detection circuit, and second electrical connection of the at least one position detection coil to the reception circuit; and

    a power transmission control circuit that switches from the first electrical connection to the second electrical connection if the position detection circuit has determined that the voltage or the current of the signal detected via the at least one position detection coil has been smaller than the reference value for a predetermined period, and that causes the reception circuit to receive the wireless signal via the at least one position detection coil.

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