Detection apparatus, power receiving apparatus, non-contact power transmission system and detection method

Abstract

The invention relates to a detection apparatus, a power receiving apparatus, a non-contact power transmission system and a detection method. The detection apparatus includes: a resonant circuit provided with a Q-factor measurement coil and one or more capacitors to serve as a circuit for receiving pulses; a response-waveform detecting section configured to detect the waveform of a response output by the resonant circuit in response to the pulses; and a Q-factor measuring section configured to measure a Q factor of the resonant circuit from the response waveform detected by the response-waveform detecting section. It is possible to increase the precision of detection of a metallic foreign substance existing between a power transmitting side and a power receiving side.

Description

[0001] Cross References to Related Applications [0002] The present application contains subject matter related to the disclosure of Japanese Priority Patent Application JP 2011-280059 filed in the Japan Patent Office on Dec. 21, 2011, the entire content of which is hereby incorporated by reference. technical field [0003] The present application relates to a detection device for detecting the presence of a conductor such as metal between a power transmission device and a power reception device. In addition, the present application also relates to a power receiving device, a non-contact power transmission system, and a detection method. Background technique [0004] In recent years, non-contact power transmission systems that provide power by using wireless technology have been rapidly developed. Methods of supplying power using wireless technology include the following two methods. [0005] One of these two methods is the widely known electromagnetic induction method. ...

AI Technical Summary

Problems solved by technology

In this case, it is difficult to determine whether the change in parameters is caused by the influence of metal shells, etc., or by the presence of metal foreign objects

For example, in the case of the technique disclosed in Patent Document 2, it is difficult to determine whether the eddy current loss is caused by the metal case of the mobile device or by a metal foreign object existing between the power transmitting side and the power receiving side

Thus, as is clear from the above description, the technologies disclosed in Patent Documents 1 and 2 are hardly said to be technologies capable of detecting metal foreign matter with high accuracy.

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