POWER TRANSMISSION APPARATUS AND WIRELESS POWER TRANSMISSION SYSTEM
First Claim
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.
1 Assignment
0 Petitions
Accused Products
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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Citations
13 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A power transmission apparatus for transmitting power to one or more power reception apparatuses each including a power reception coil in a non-contact manner, comprising:
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a power transmission coil that is disposed within the power transmission apparatus opposite an installation surface of the power transmission apparatus, the one or more power reception apparatuses are installed on the installation surface, the power transmission apparatus being capable of being electromagnetically coupled with the power reception coil; a plurality of position detection coils that are disposed side by side between the installation surface and the power transmission coil, and that detect each signal from each the power reception coil included in the one or more power reception apparatuses installed on the installation surface; a position detection circuit that receives, from each of the plurality of position detection coils, voltages or currents of the signals detected by each of the plurality of position detection coils; a power transmission control circuit that determines a position of the one or more power reception apparatuses installed on the installation surface by comparing the voltages or the currents of the signals; a reception circuit that demodulates into a data signal a wireless signal transmitted from the one or more power reception apparatuses to the power transmission apparatus and that outputs the data signal to the power transmission control circuit; and a switch circuit that switches between electrical connection of each of the plurality of position detection coils to the position detection circuit, and electrical connection of each of the plurality of position detection coils to the reception circuit, wherein, if the power transmission control circuit determines that the one or more power reception apparatuses are installed at the determined position of the one or more power reception apparatuses installed on the installation surface for a predetermined time, the power transmission control circuit switches the electrical connection of a position detection coil corresponding to the determined position of the one or more power reception apparatuses from the position detection circuit to the reception circuit, and causes the reception circuit to receive the wireless signal via the position detection coil. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification