Power transmission device, and method for power transmission device

Abstract

A power transmission device, which wirelessly transmits power to a power reception device, detects an object by transmitting an analog ping. The power transmission device transmits a digital ping and the power reception device is activated to perform communication. The power transmission device determines the strength of electromagnetic coupling between a power transmission antenna and a power reception antenna using a plurality of analog pings or digital pings having different conditions. When it is recognized that the electromagnetic coupling between the two antennas is weak, the power transmission device performs control for suppressing noise leaking from the antenna to the surroundings, control for suppressing instability in communication between the power transmission device and the power reception device; and control for suppressing deterioration in accuracy of detection of an object located between the power transmission device and the power reception device.

Dependencies are inferred from the claim text.