| 摘要 |
A wireless power transfer system includes a power receiving device that receives transmission by wireless power transfer, a transmission device that has a transmission element that transmits transmission power to the power receiving device, the transmission device having a control mechanism that controls an oriented direction of the transmission element, and a positioning device that is connected communicably with the transmission device, the positioning device receiving with a plurality of antennas arranged adjacent to each other a positioning signal that is a wireless signal transmitted from the power receiving device, the positioning device having a positioning function that calculates a direction α in which the power receiving device exists when seen from the positioning device itself and a position of the power receiving device, based on a phase difference between the received positioning signals. |
| 主权项 |
1. A wireless power transfer system comprising:
a power receiving device that receives transmission by wireless power transfer; a transmission device that has a transmission element that transmits transmission power to the power receiving device, the transmission device having a control mechanism that controls an oriented direction of the transmission element; a positioning device that is connected communicably with the transmission device, the positioning device receiving with a plurality of antennas arranged adjacent to each other a positioning signal that is a wireless signal transmitted from the power receiving device, the positioning device having a positioning function that calculates a direction α in which the power receiving device exists when seen from the positioning device itself and a position of the power receiving device, based on a phase difference between the received positioning signals, wherein the transmission device
acquires from the positioning device a direction α in which the power receiving device exists, controls the control mechanism so that the oriented direction of the transmission element faces the direction of the power receiving device based on the acquired direction α, and starts transmission, andacquires a distance between the transmission device itself and the power receiving device based on the position of the power receiving device acquired from the positioning device, and obtains a permissible range of transmission efficiency at the time of transmitting the transmission power to the power receiving device, which corresponds to the acquired distance, the power receiving device transmits to the transmission device a power value that is currently being supplied from the transmission device, the transmission device
receives the power value sent from the power receiving device,obtains a current transmission efficiency, based on the received power value and a power value of the transmission power currently being transmitted from the transmission element, andin the case that the current transmission efficiency deviates from the permissible range, acquires again from the positioning device a direction α in which the power receiving device exists, and based on the acquired direction α, controls the oriented direction of the transmission element so that the oriented direction of the transmission element faces the direction of the power receiving device. |
