Wireless power transmission apparatus and supply power control method of wireless power transmission apparatus
First Claim
1. A wireless power transmission apparatus configured to supply power by resonance phenomenon from a power-supplying module connected with a power source to a power-receiving module connected with a power-supplied device including a secondary battery which is chargeable by a constant current-constant voltage charging system, the wireless power transmission apparatus comprising:
- an input impedance measuring apparatus configured to measure an input impedance of the wireless power transmission apparatus including the power-supplied device; and
a control device configured to determine whether a constant current charging period is finished based on a change in the input impedance measured by the input impedance measuring apparatus, and terminate charging when it is determined that the constant current charging period is finished, whereinthe power-supplying module includes at least a power-supplying coil and a power-supplying resonator, and the power-receiving module includes at least a power-receiving resonator and a power-receiving coil, anda load variation characteristic is adjustable by adjusting at least one of a coupling coefficient between the power-supplying coil and the power-supplying resonator, a coupling coefficient between the power-supplying resonator and the power-receiving resonator, and a coupling coefficient between the power-receiving resonator and the power-receiving coil.
1 Assignment
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Accused Products
Abstract
A wireless power transmission apparatus which is charged in a short charging time and prevents the shortening of the life of a secondary battery is provided. A wireless power transmission apparatus includes a current-voltage detector configured to measure an input impedance Zin of the wireless power transmission apparatus including the power-supplied device and a control device configured to determine whether a constant current charging period (CC) is finished by utilizing a change in the input impedance Zin measured by the current-voltage detector and terminate the charging of the lithium ion secondary battery when it is determined that the constant current charging period (CC) is finished.
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Citations
7 Claims
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1. A wireless power transmission apparatus configured to supply power by resonance phenomenon from a power-supplying module connected with a power source to a power-receiving module connected with a power-supplied device including a secondary battery which is chargeable by a constant current-constant voltage charging system, the wireless power transmission apparatus comprising:
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an input impedance measuring apparatus configured to measure an input impedance of the wireless power transmission apparatus including the power-supplied device; and a control device configured to determine whether a constant current charging period is finished based on a change in the input impedance measured by the input impedance measuring apparatus, and terminate charging when it is determined that the constant current charging period is finished, wherein the power-supplying module includes at least a power-supplying coil and a power-supplying resonator, and the power-receiving module includes at least a power-receiving resonator and a power-receiving coil, and a load variation characteristic is adjustable by adjusting at least one of a coupling coefficient between the power-supplying coil and the power-supplying resonator, a coupling coefficient between the power-supplying resonator and the power-receiving resonator, and a coupling coefficient between the power-receiving resonator and the power-receiving coil. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A supply power control method of a wireless power transmission apparatus for supplying, by changing a magnetic field, power from a power-supplying module connected with a power source to a power-receiving module connected with a power-supplied device including a secondary battery which is chargeable by a constant current-constant voltage charging system, the power-supplying module includes at least a power-supplying coil and a power-supplying resonator, and the power-receiving module includes at least a power-receiving resonator and a power-receiving coil, the wireless power transmission apparatus including:
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an input impedance measuring apparatus configured to measure an input impedance of the power transmission apparatus; and a control device, and the control device being configured to execute the steps of; determining whether a constant current charging period is finished, by utilizing a change in the input impedance measured by the input impedance measuring apparatus; terminating charging when it is determined that the constant current charging period is finished; and adjusting a load variation characteristic by adjusting at least one of a coupling coefficient between the power-supplying coil and the power-supplying resonator, a coupling coefficient between the power-supplying resonator and the power-receiving resonator, and a coupling coefficient between the power-receiving resonator and the power-receiving coil.
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Specification