Metal foreign matter detection method and device, wireless charging system and electric vehicle

Abstract

The invention provides a metal foreign matter detection method and device, a wireless charging system and an electric vehicle, and relates to the field of wireless charging. An excitation source in the metal foreign matter detection device can drive transmitting coils in coil groups to generate a detection magnetic field, so that the detection coils in the coil groups can generate an induction signal in the detection magnetic field. Since a power transmitting coil is not needed to provide a detection magnetic field, the detection efficiency and the detection flexibility of metal foreign matters are effectively improved. Moreover, each coil group comprises a plurality of detection coils, and one or more parameters of the structures of the plurality of detection coils and the arrangement positions of the plurality of detection coils on the arrangement plane of the coil group are different, so that a foreign matter detection circuit can detect the metal foreign matters according to induction signals generated by the plurality of detection coils, the detection accuracy of the metal foreign matters is improved, and a good detection effect is achieved.

Description

technical field [0001] The present application relates to the field of wireless charging, in particular to a metal foreign object detection method and device, a wireless charging system, and an electric vehicle. Background technique [0002] Wireless charging (wireless power transmission, WPT) is a technology that uses coupled electromagnetic fields as the medium to transfer electric energy to charge the on-board power supply of electric vehicles. A wireless charging system generally includes: power transmitting equipment installed on the ground or underground, and power receiving equipment installed at the bottom of the electric vehicle. The power transmitting coil in the power transmitting device and the power receiving coil in the power receiving device can transfer energy to each other through electromagnetic mutual induction. [0003] When there is a metal foreign object in the area where the ground power transmitting coil is located, the metal foreign object will be h...

AI Technical Summary

Problems solved by technology

[0005] This application provides a method and device for detecting metal foreign objects, a wireless charging system, and an electric vehicle, which can solve the problems of low detection efficiency and poor detection flexibility of metal foreign objects in related technologies. The technical solution is as follows:

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