Detecting device, power receiving device, contactless power transmission system, and detecting method

摘要

Disclosed herein is a detecting device including a coil (21) electromagnetically coupled to the external coil (10A), a resonant circuit that includes at least the coil, and a detecting section (26) that superimposes a measurement signal for measuring the Q-factor of the resonant circuit on a power transmission signal transmitted to the coil in a contactless manner and removes the power transmission signal from an alternating-current signal obtained by superimposing the measurement signal on the power transmission signal. The detecting section measures the Q-factor by using the alternating-current signal from which the power transmission signal is removed.