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. The power transmission device includes a power factor calculator configured to calculate a power factor based on a phase difference between a voltage and a current supplied to the power transmission coil, and a control amount calculator configured to control electric power supplied to the power transmission coil according to a power command value, and regulate the electric power supplied to the power transmission coil when the power factor falls to a predetermined threshold power factor or less. The power transmission can therefore be regulated immediately when the power receiving coil is shifted from the power transmission coil.
Wireless power supply system and power transmission device
22.08.2017
Patent
Elektronische Ressource
Englisch
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