Power feeding device, power receiving device, and wireless power feed system
First Claim
1. A wireless power feeding method comprising the steps of:
- performing power feeding to a power receiving device by a power feeding device; and
obtaining a parameter corresponding to a distance between the power feeding device and the power receiving device by the power feeding device,wherein the power feeding device comprises a first resonant coil and a first electromagnetic coupling coil,wherein the power receiving device comprises a second resonant coil and a second electromagnetic coupling coil,wherein during the power feeding, power feeding conducted by a resonant method or power feeding conducted by an electromagnetic coupling method are selected in accordance with the parameter,wherein in the case where the power feeding conducted by the resonant method is selected, the first resonant coil electromagnetically resonates with the second resonant coil,wherein in the case where the power feeding conducted by the electromagnetic coupling method is selected, the first resonant coil is short-circuited and the first electromagnetic coupling coil is electromagnetically coupled with the second resonant coil, andwherein the first electromagnetic coupling coil is between the first resonant coil and the second resonant coil during the power feeding.
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Abstract
A wireless power feed system with high transfer efficiency of electric power is disclosed. The wireless power feed system includes a power feeding device and a power receiving device, wherein the power feeding device includes a first electromagnetic coupling coil that is connected to an AC power source via a directional coupler; a first resonant coil; a switch connected to the opposite ends of the first resonant coil; a control circuit which conducts switching on/off of the switch based on a parameter of an amplitude of a reflective wave detected by the directional coupler; and an analog-digital converter provided between the first electromagnetic coupling coil and the control circuit; and the power receiving device includes a second resonant coil; and a second electromagnetic coupling coil, and wherein the first electromagnetic coupling coil is provided between the first resonant coil and the second resonant coil.
44 Citations
11 Claims
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1. A wireless power feeding method comprising the steps of:
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performing power feeding to a power receiving device by a power feeding device; and obtaining a parameter corresponding to a distance between the power feeding device and the power receiving device by the power feeding device, wherein the power feeding device comprises a first resonant coil and a first electromagnetic coupling coil, wherein the power receiving device comprises a second resonant coil and a second electromagnetic coupling coil, wherein during the power feeding, power feeding conducted by a resonant method or power feeding conducted by an electromagnetic coupling method are selected in accordance with the parameter, wherein in the case where the power feeding conducted by the resonant method is selected, the first resonant coil electromagnetically resonates with the second resonant coil, wherein in the case where the power feeding conducted by the electromagnetic coupling method is selected, the first resonant coil is short-circuited and the first electromagnetic coupling coil is electromagnetically coupled with the second resonant coil, and wherein the first electromagnetic coupling coil is between the first resonant coil and the second resonant coil during the power feeding. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A wireless power feeding method comprising the steps of:
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performing power feeding to a power receiving device by a power feeding device; and obtaining a parameter corresponding to a distance between the power feeding device and the power receiving device by the power receiving device, wherein the power feeding device comprises a first resonant coil and a first electromagnetic coupling coil, wherein the power receiving device comprises a second resonant coil and a second electromagnetic coupling coil, wherein during the power feeding, power feeding conducted by a resonant method or power feeding conducted by an electromagnetic coupling method are selected in accordance with the parameter, wherein in the case where the power feeding conducted by the resonant method is selected, the first resonant coil electromagnetically resonates with the second resonant coil, wherein in the case where the power feeding conducted by the electromagnetic coupling method is selected, the second resonant coil is short-circuited and the second electromagnetic coupling coil is electromagnetically coupled with the first resonant coil, and wherein the second electromagnetic coupling coil is between the first resonant coil and the second resonant coil during the power feeding. - View Dependent Claims (8, 9, 10, 11)
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Specification