Foreign object detection device, wireless power supply device, and wireless power transmission system

Abstract

The technical problem of the present invention is to provide a foreign matter detection device capable of suppressing a decrease in foreign matter detection accuracy even if the state of a foreign matter detection region may change. This foreign matter detection device is provided with: an imaging device that includes a foreign matter detection region within an imaging range; and a foreign matter presence / absence determination unit that determines the presence / absence of a foreign matter on the basis of a result of comparison between a captured image captured by the imaging device and a reference image in which no foreign matter is present within the imaging range, the foreign matter presence / absence determination unit determines that no foreign matter is present on the basis of the comparison result and that a predetermined first condition is satisfied, and the foreign matter presence / absence determination unit determines that no foreign matter is present on the basis of the comparison result. And an update processing for updating the reference image to an updated reference image in which the foreign matter presence / absence determination unit determines that there is no foreign matter.

Description

technical field [0001] The present disclosure relates to a foreign object detection device, a wireless power supply device, and a wireless power transmission system. Background technique [0002] At present, a wireless power transmission system that wirelessly transmits power is known. In the wireless power transmission system, in the case where foreign matter exists on the surface of the power feeding coil, there is a possibility that the reception level of the power delivered from the power feeding coil is lowered. Therefore, a foreign matter detection device that detects the presence or absence of such foreign matter is used. [0003] In the wireless power transmission system described in Patent Document 1, based on an image captured by an imaging device that captures a detection region (foreign object detection region) including at least a part of the coil unit, a first determination of the presence or absence of a foreign object is performed. deal with. In this case,...

AI Technical Summary

Problems solved by technology

In the wireless power transmission system, in the case where there is a foreign object on the surface of the feeding coil, there is a possibility that the reception level of the power fed from the feeding coil decreases

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