Metal foreign matter detecting device and method for wireless charging system

Abstract

The invention discloses a metal foreign matter detecting device and method for a wireless charging system, and belongs to the field of wireless charging. The device includes a magnetorheological fluiddetector, a motion executing mechanism and a signal collecting device; the magnetorheological fluid detector contains a magnetorheological fluid material; the output end of the magnetorheological fluid detector is connected to the input end of the signal collecting device; and the motion executing mechanism controls the magnetorheological fluid detector to move horizontally along a primary coil.The motion executing mechanism can control the magnetorheological fluid detector to scan the primary coil before the primary coil charges a secondary coil, the signal collecting device can observe whether metal foreign matters exist in the primary coil, so that the technical effects of metal foreign matters detection can be achieved; and the device and method are simple in structure, high in detection sensitivity and low in cost.

Description

technical field [0001] The invention relates to the field of wireless charging, in particular to a metal foreign object detection device and method for a wireless charging system. Background technique [0002] The inductive wireless charging system for electric vehicles has the following problems during the charging process: first, it is difficult to be noticed when foreign objects enter the magnetic field coupling area between the primary and secondary coils; second, when there are metal foreign objects (such as metal fragments) , coins, cans, etc.) or biological foreign matter exists in the coupling area between the primary and secondary coils, which will affect the distribution of the original charging magnetic field, thereby affecting the charging efficiency; third, the entry of a certain volume or quantity of metal foreign matter may even cause significant power loss. The temperature of the foreign matter will rise, which will lead to serious consequences such as fire a...

AI Technical Summary

Problems solved by technology

[0002] The electric vehicle inductive wireless charging system has the following problems during the charging process: first, it is difficult to be noticed when foreign objects enter the magnetic field coupling area between the primary and secondary coils; second, when there are metal foreign objects (such as metal fragments) , coins, cans, etc.) or biological foreign matter exists in the coupling area between the primary and secondary coils, which will affect the distribution of the original charging magnetic field, thereby affecting the charging efficiency; third, the entry of a certain volume or quantity of metal foreign matter may even cause significant power loss. The temperature of the foreign matter will rise, which will lead to serious consequences such as fire and device damage.

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