Detection device, detection method and judgment device for metal foreign matter and wireless charging system

Abstract

The invention discloses a detection device for metal foreign matter. The detection device for metal foreign matter comprises m detection coils uniformly arranged in parallel in the first direction, and n detection coils uniformly arranged in parallel in the second direction, wherein the detection coils in the first direction overlap the detection coils in the second direction. Each detection coil is composed of k coil units, wherein every two coil units form one set from one end of the detection coil, the detection units included in each set are different, the two coil units in each set are equal in area and opposite in winding direction, and when the coil units of the detection coil are placed in a magnetic field, the voltage or current of the detection coil is within a preset value range. The invention further discloses a detection method and a judgment device for metal foreign matter and a wireless charging system. The metal foreign matter detection sensitivity of the wireless charging system is improved.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to a metal foreign object detection device, a detection method, a judging device and a wireless charging system. Background technique [0002] With the gradual depletion of fossil energy and the increasing environmental pollution, human beings are looking for greener and cleaner alternative energy sources and energy-saving and environmentally friendly lifestyles. In order to alleviate the dependence of traditional vehicles on fossil energy and reduce exhaust emissions, electric vehicles are a better solution. Electric vehicles convert electric energy into driving force, and have the characteristics of zero emission and zero pollution, which can greatly reduce the dependence on fossil energy and reduce exhaust emissions. Electric vehicles have gradually become an important direction for the future development of motor vehicles. At present, many governments are vigorously supporting ...

AI Technical Summary

Problems solved by technology

Due to the strong alternating magnetic field between the primary coil and the secondary coil during wireless charging, if there is a metal foreign object on the surface of the primary coil on the ground side or between the primary coil and the secondary coil, the metal foreign object will induce The electromotive force will cause a large power loss, and the induced electromotive force will increase the temperature of the foreign object, which will cause a fire if it is serious. However, the detection sensitivity of the metal foreign object in the existing wireless charging system is not high enough.

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