POWER TRANSMISSION DEVICE AND WIRELESS POWER TRANSMISSION SYSTEM

摘要

A power transmission device includes power transmission coils arranged in a line in a plane, a power transmission circuit connected to the power transmission coils and supplying AC power, and a control circuit controlling a connection state between the power transmission circuit and each power transmission coil. The length of each power transmission coil in the array direction is shorter than that of the power receiving coil in that direction, the length thereof in a direction perpendicular to the array direction in the plane is longer than that of the power receiving coil in that direction, and the control circuit selects adjacent power transmission coils whose number is fixed based on the relative position of the power receiving coil with respect to the power transmission coils and switches the above connection state such that the AC power is supplied to the selected power transmission coils.

主权项

1. A power transmission device comprising:
power transmission coils arranged in a line such that each principal surface of the power transmission coils is in parallel to a surface of the power transmission device, the power transmission coils transmitting AC power wirelessly to a power receiving coil of a power receiving device; a power transmission circuit that is connected to the power transmission coils and supplies the AC power to the power transmission coils; and control circuitry operative to: switch an electrical connection state between the power transmission circuit and each of the power transmission coils, detect a relative position between the power receiving coil and each of the power transmission coils, select the power transmission coils adjacent to each other from the transmission coils based on the detected relative position, thereby fixing a number of the selected power transmission coils, and cause the power transmission circuit to supply the AC power to the selected power transmission coils, wherein in an array direction of the power transmission coils, a length Dwt of each of the power transmission coils is shorter than a maximum diameter Dwr of the power receiving coil.