Wireless power supply system and power transmission device
First Claim
1. A wireless power supply system comprising a power transmission device provided on a ground side and having a power transmission coil, and a power receiving device provided in a vehicle and having a power receiving coil, the power transmission coil transmitting electric power to the power receiving coil via a wireless connection, so as to supply the electric power to an electrical load installed in the power receiving device,the power transmission device including:
- an efficiency calculator configured to calculate a power transmission efficiency based on a transmission power command value and the electric power supplied to the electrical load; and
a switching controller configured to stop supplying the electric power received by the power receiving coil to the electrical load when the power transmission efficiency falls to a predetermined threshold efficiency or less,the power transmission device including;
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 power controller configured to control electric power supplied to the power transmission coil according to a transmission 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 since the electric power supplied to the electrical load is stopped.
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Accused Products
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. 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.
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Citations
2 Claims
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1. A wireless power supply system comprising a power transmission device provided on a ground side and having a power transmission coil, and a power receiving device provided in a vehicle and having a power receiving coil, the power transmission coil transmitting electric power to the power receiving coil via a wireless connection, so as to supply the electric power to an electrical load installed in the power receiving device,
the power transmission device including: -
an efficiency calculator configured to calculate a power transmission efficiency based on a transmission power command value and the electric power supplied to the electrical load; and a switching controller configured to stop supplying the electric power received by the power receiving coil to the electrical load when the power transmission efficiency falls to a predetermined threshold efficiency or less, the power transmission device including; 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 power controller configured to control electric power supplied to the power transmission coil according to a transmission 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 since the electric power supplied to the electrical load is stopped. - View Dependent Claims (2)
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Specification