POWER TRANSMISSION DEVICE AND WIRELESS POWER TRANSMISSION SYSTEM

A power transmitting and receiving system includes a power receiving device including a power receiving coil, and a power transmission device including power transmission coils arranged in a line, a power transmission circuit, and control circuitry. The control circuitry switches an electrical connection between the power transmission circuit and each power transmission coil, detects a relative position between the power receiving coil and each power transmission coil, selects adjacent power transmission coils based on the relative position, and causes the power transmission circuit to supply AC power to the selected power transmission coils. In an array direction of the power transmission coils, width Dwt of each power transmission coil is shorter than width Dwr of the power receiving coil. In a direction perpendicular to the array direction, width Dlt of each power transmission coil is equal to or longer than width Dlr of the power receiving coil.