Wireless power supply system and power transmission device
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United States of America Patent
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Oct 24, 2017
Grant Date -
Jul 20, 2017
app pub date -
Feb 25, 2014
filing date -
Feb 25, 2014
priority date (Note) -
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Abstract
A wireless power supply system includes a power transmission device having a power transmission coil and a power receiving device having a power receiving coil. The power transmission coil transmits electric power to the power receiving coil via a wireless connection, so as to supply the electric power to a battery installed in the power receiving device. The power transmission device controls electric power supplied to the power transmission coil according to a transmission power command value. The power receiving device calculates a power transmission efficiency based on the electric power supplied to the electrical load and the transmission power command value and stops supplying the electric power when the power transmission efficiency falls to a threshold efficiency or less. The power transmission device regulates the output power when a current flowing through the power transmission coil exceeds a threshold current.
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