Power feeding apparatus, power receiving apparatus, wireless power feeding system and method for wireless transfer of power
First Claim
1. A power feeding apparatus comprising:
- an impedance detector;
a controller configured to provide first control information and second control information based on an impedance detected by the impedance detector;
a power transmitter configured to wirelessly transmit power, the power transmitter including a power feeding coil with a variable diameter;
a variable matching circuit configured to change the variable diameter of the power feeding coil according to the first control information; and
a signal transmitter configured to wirelessly transmit the second control information;
wherein the second control information is based on an external current state of an external variable matching circuit, associated with an external device, and an external impedance of the external device; and
a storage device configured to store impedance characteristic information including a relationship between an impedance characteristic of the power feeding apparatus and an external impedance characteristic of the external device.
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Accused Products
Abstract
A power feeding apparatus, power receiving apparatus, wireless power feeding system, and method for wireless transfer of power are provided. The power feeding apparatus includes an impedance detector, a controller, a power transmitter, a variable matching circuit, and a signal transmitter. The controller is configured to provide first control information and second control information based on an impedance detected by the impedance detector. The power feeding apparatus'"'"' variable matching circuit is configured to change a variable diameter of a power feeding coil according to the first control information. The power receiving apparatus includes a power receiver, a signal receiver, and a variable matching circuit. The power receiving apparatus'"'"'variable matching circuit is configured to change a variable diameter of a power feeding coil according to the second control information provided by the power feeding apparatus.
253 Citations
13 Claims
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1. A power feeding apparatus comprising:
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an impedance detector; a controller configured to provide first control information and second control information based on an impedance detected by the impedance detector; a power transmitter configured to wirelessly transmit power, the power transmitter including a power feeding coil with a variable diameter; a variable matching circuit configured to change the variable diameter of the power feeding coil according to the first control information; and a signal transmitter configured to wirelessly transmit the second control information; wherein the second control information is based on an external current state of an external variable matching circuit, associated with an external device, and an external impedance of the external device; and a storage device configured to store impedance characteristic information including a relationship between an impedance characteristic of the power feeding apparatus and an external impedance characteristic of the external device. - View Dependent Claims (2, 3, 4)
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5. A power feeding apparatus comprising:
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an impedance detector; a controller configured to provide first control information and second control information based on an impedance detected by the impedance detector; a power transmitter configured to wirelessly transmit power, the power transmitter including a power feeding coil with a variable diameter; a variable matching circuit configured to change the variable diameter of the power feeding coil according to the first control information; and a signal transmitter configured to wirelessly transmit the second control information, wherein the second control information includes at least one of diameter change information, impedance detection result information, and setting information associated with an external variable matching circuit.
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6. A wireless power feeding system comprising:
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a power feeding apparatus and a power receiving apparatus, the power feeding apparatus including; (a) an impedance detector; (b) a controller configured to provide first control information and second control information based on an impedance detected by the impedance detector; (c) a power transmitter configured to wirelessly transmit power to the power receiving apparatus, the power transmitter including a first power feeding coil with a first variable diameter; (d) a first variable matching circuit configured to change the first variable diameter of the first power feeding coil according to the first control information; and (e) a signal transmitter configured to wirelessly transmit the second control information to the power receiving apparatus; and the power receiving apparatus including; (a) a power receiver configured to wirelessly receive power from the power feeding apparatus, the power receiver including a second power feeding coil with a second variable diameter; (b) a signal receiver configured to wirelessly receive the second control information from the power feeding apparatus; and (c) a second variable matching circuit configured to change the second variable diameter of the second power feeding coil according to the second control information, wherein the second control information is based on the impedance detected in the power feeding apparatus. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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Specification