Winding structure of metal foreign matter detection coil for electromagnetic induction, method and system

Abstract

The invention discloses an winding structure of a metal foreign matter detection coil for electromagnetic induction, a method and a system. The winding structure comprises a first-stage coil matrix, wherein the first-stage coil matrix comprises a first detection coil group, the first detection coil group comprises four first detection coils, the four first detection coils are distributed in a shape like a Chinese character tian and are sequentially connected end to end to form a coil, and the winding directions of every two adjacent first detection coils are opposite. The detection method comprises the following steps: detecting an induced voltage U1 of the first-stage detection coil matrix, and if U1 exceeds a preset threshold U01, judging that there is a metal foreign matter; if the U1 does not exceed the preset threshold U01, further detecting the induced voltage U2 of a second-stage detection coil matrix, and if the U2 exceeds a preset threshold U02, judging that a metal foreign matter exists; and if the U2 does not exceed the preset threshold U02, continuing to detect until the N-level detection coil matrix is detected. According to the invention, the applicability of power wireless charging equipment to different types of metal foreign matters can be improved.

Description

technical field [0001] The invention relates to the technical field of wireless power transmission, in particular to an electromagnetic induction metal foreign object detection coil winding structure, method and system. Background technique [0002] With the continuous advancement of foreign object detection technology, three types of detection methods have been developed, which are detecting metal foreign objects through detection system parameters, detecting metal foreign objects through detection coils, and detecting metal foreign objects through sensors such as ultrasonic and infrared sensors. Among them, the detection coil has the advantages of being able to distinguish metal foreign objects and has high detection accuracy, but there is still a wireless charging system that has a great influence on the detection coil during operation. As well as the disadvantages of low detection accuracy and slow detection time for metal foreign objects such as paper clips. Therefore,...

AI Technical Summary

Problems solved by technology

Among them, the detection coil has the advantages of being able to distinguish metal foreign objects and has high detection accuracy, but there is still a large impact on the detection coil when the wireless charging system is working. As well as the disadvantages of low detection accuracy and slow detection time for metal foreign objects such as paper clips

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