CONTACTLESS POWER TRANSMISSION SYSTEM, FOREIGN MATTER DETECTION METHOD, POWER TRANSMISSION DEVICE, AND POWER RECEIVING DEVICE

摘要

A contactless power transmission system has a power transmission device provided with a primary-side coil, a power receiving device provided with a secondary-side coil, and a distance sensor for measuring the distance between the power transmission device and the power receiving device. The power receiving device receives power from the power transmission device and then transmits information about the received power to the power transmission device. The power transmission device calculates a theoretical value of the power received by the power receiving device corresponding to the distance between the power transmission device and the power receiving device measured by the distance sensor, and stops power transmission to the power receiving device when the power received by the power receiving device does not match the theoretical value corresponding to the distance.