Foreign matter detection method and apparatus, and terminal device

Abstract

The embodiment of the invention discloses a foreign matter detection method and apparatus, and a terminal device, applied to the field of electronic technology. The method disclosed by the embodiment of the invention comprises the following steps: after a wireless charging function is started, acquiring an infrared thermal imaging image between a wireless power transmitting terminal and a wireless power receiving terminal; if an abnormal object exists in the infrared thermal imaging image, judging whether a temperature value of the abnormal object meets a preset rule; and if the temperature value of the abnormal object meets the preset rule, sending a wireless charging termination instruction to the wireless power transmitting terminal, wherein the wireless charging termination instruction is used for indicating the wireless power transmitting terminal to terminate the wireless charging. By implementation of the embodiment of the invention, the foreign matter detection accuracy in a wireless charging process can be improved, and thus the security in the wireless charging process is improved.

Description

technical field [0001] The present invention relates to the field of electronic technology, in particular to a foreign object detection method, device and terminal equipment. Background technique [0002] With the popularization of terminal devices such as smart phones, in order to realize the purpose of charging smart phones anytime and anywhere, a short-distance wireless charging technology has emerged as the times require. The wireless charging technology transmits electric energy through the coupling of the sending coil and the receiving coil. The wireless charger can be called the electric energy transmitting end, referred to as TX; the mobile phone with wireless charging function is called the electric energy receiving end, referred to as RX. When the TX end is charging the RX end, when metal objects such as coins and keys are also placed on the TX end sending coil, the metal objects will absorb electric energy and generate heat. For the sake of safety and energy savin...

AI Technical Summary

Problems solved by technology

However, in actual use, it is found that due to the high correlation between wireless charging efficiency and position, there will be a large magnetic resistance when the position is not aligned. When the charging position is slightly deviated, the system will misjudge the existence of metal foreign objects. As a result, the charging is unstable, and if there is a small metal object between the TX end and the RX end before charging, there is no magnetic resistance change at all during wireless charging, and when the foreign object detection threshold of the system is not reached, the system will also judge it as No metal foreign objects, which reduces the accuracy of foreign object detection, which in turn increases safety hazards

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