Power transmission apparatus and wireless power transmission system
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United States of America Patent
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Nov 28, 2017
Grant Date -
Apr 30, 2015
app pub date -
Oct 23, 2014
filing date -
Oct 28, 2013
priority date (Note) -
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Abstract
A power transmission apparatus includes the following elements. A position detection coil detects a signal from a power reception coil of a power reception apparatus installed on an installation surface. A position detection circuit determines from the detected signal that the power reception apparatus is installed on the installation surface. A reception circuit receives a wireless signal transmitted from the power reception apparatus via the position detection coil. A switch circuit switches electrical connection of the position detection coil between the position detection circuit and the reception circuit. A power transmission control circuit switches electrical connection of the position detection coil from the position detection circuit to the reception circuit if it is determined that a voltage or a current of the detected signal has been smaller than a reference value for a predetermined period, and causes the reception circuit to receive the wireless signal via the position detection coil.
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