CONTACTLESS ELECTRICITY SUPPLY DEVICE
1 Assignment
0 Petitions
Accused Products
Abstract
A contactless electric power supply device 100 to charge a battery 28 of a vehicle includes a power transmitting circuit 101 having a power transmitting coil 12 and a charging circuit 201 having a power receiving coil 22. An electric power is transmitted from power transmitting coil 12 to power receiving coil 22 in a contactless manner. When the vehicle approaches power supply device 100, a trial power supply in which a electric power transmission through a minute electric power is carried out is executed and a power transmission efficiency from power transmitting coil 12 to power receiving coil 22 is estimated on a basis of a current flowing through power transmitting circuit 101. From this power transmission efficiency, a determination of whether power receiving coil 22 falls in a range in which battery 28 is chargeable with respect to power transmitting coil 12 is made.
39 Citations
15 Claims
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1-9. -9. (canceled)
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10. A contactless power supply device for transmitting an electric power from a first coil to a second coil in a contactless manner by means of at least a magnetic coupling, comprising:
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a power transmitting circuit including the first coil; a sensor configured to measure a current flowing through the power transmitting circuit or to measure a voltage applied to the power transmitting circuit; power transmission efficiency estimating means for estimating a power transmission efficiency from the first coil to the second coil on a basis of a detected value of the sensor; a battery providing a power source of a vehicle; a charging circuit including the second coil and charging the battery; and determining means for determining that a positional deviation between the first coil and the second coil falls in a range in which the battery is chargeable, in a case where the power transmission efficiency estimated by the power transmission efficiency estimating means is higher than a predetermined value. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification