WIRELESS ELECTRIC POWER TRANSMISSION DEVICE
First Claim
1. A wireless electric power transmission device for supplying electric power, transmitted wirelessly from a first device, to a load circuit, the wireless electric power transmission device comprising:
- a power receiving resonance unit including a power receiving coil and a capacitor;
an impedance converting unit configured to change an impedance of the wireless electric power transmission device as seen by the first device, and supply the electric power from the power receiving resonance unit to the load circuit;
a detecting unit configured to detect electric power information corresponding to the electric power supplied to the load circuit; and
a control unit configured to control the impedance converting unit, and determine whether to adjust at least one of a resonant frequency of the power receiving resonance unit, an output frequency of an alternating current power supply of the first device, and a resonant frequency of a power transmitting resonance unit of the first device, on the basis of a relationship in terms of magnitude between first electric power information detected by the detecting unit when an impedance of the wireless electric power transmission device is set to a first impedance and second electric power information detected by the detecting unit when an impedance of the wireless electric power transmission device is set to a second impedance which is different from the first impedance.
1 Assignment
0 Petitions
Accused Products
Abstract
According to one embodiment, a wireless electric power transmission device supplies electric power, transmitted wirelessly from a first device, to a load circuit. The device includes a power receiving resonance unit, a detecting unit which detects electric power information corresponding to the electric power supplied to the load circuit, and a control unit. The control unit determines whether to adjust at least one of a resonant frequency of the power receiving resonance unit, an output frequency of an alternating current power supply of the first device, and a resonant frequency of a power transmitting resonance unit of the first device, on the basis of a relationship in terms of magnitude between first electric power information when the impedance is a first impedance and second electric power information when the impedance is a second impedance.
13 Citations
17 Claims
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1. A wireless electric power transmission device for supplying electric power, transmitted wirelessly from a first device, to a load circuit, the wireless electric power transmission device comprising:
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a power receiving resonance unit including a power receiving coil and a capacitor; an impedance converting unit configured to change an impedance of the wireless electric power transmission device as seen by the first device, and supply the electric power from the power receiving resonance unit to the load circuit; a detecting unit configured to detect electric power information corresponding to the electric power supplied to the load circuit; and a control unit configured to control the impedance converting unit, and determine whether to adjust at least one of a resonant frequency of the power receiving resonance unit, an output frequency of an alternating current power supply of the first device, and a resonant frequency of a power transmitting resonance unit of the first device, on the basis of a relationship in terms of magnitude between first electric power information detected by the detecting unit when an impedance of the wireless electric power transmission device is set to a first impedance and second electric power information detected by the detecting unit when an impedance of the wireless electric power transmission device is set to a second impedance which is different from the first impedance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A wireless electric power transmission device for wirelessly transmitting electric power to a power receiving device having a power receiving resonance unit and a load circuit, the wireless electric power transmission device comprising:
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an alternating current power supply; a power transmitting resonance unit including a power receiving coil and a capacitor, and transmitting the electric power, supplied from the alternating current power supply, to the power receiving device; a wireless communication unit configured to receive, from the power receiving device, first electric power information corresponding to the electric power supplied to the load circuit when an impedance of the power receiving device is set to a first impedance, and second electric power information corresponding to the electric power supplied to the load circuit when the impedance of the power receiving device is set to a second impedance which is different from the first impedance; and a control unit configured to determine whether to adjust at least one of a resonant frequency of the power receiving resonance unit, an output frequency of the alternating current power supply, and a resonant frequency of the power transmitting resonance unit, on the basis of a relationship in terms of magnitude between the first electric power information and the second electric power information. - View Dependent Claims (14, 15, 16, 17)
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Specification