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Foreign matter detection method and device forwireless charging

A technology for wireless charging and foreign object detection, applied in circuit devices, battery circuit devices, charging stations, etc., can solve the problems of easy misjudgment, insufficient foreign object detection method and device accuracy, etc.

Pending Publication Date: 2021-09-10
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present application discloses a wireless charging foreign object detection method and device, which are used to solve the shortcomings of the foreign object detection method and device in the prior art that are not accurate enough and are prone to misjudgment

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  • Foreign matter detection method and device forwireless charging
  • Foreign matter detection method and device forwireless charging
  • Foreign matter detection method and device forwireless charging

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Embodiment Construction

[0086] This application is applied in a wireless charging scenario. Wireless charging, also known as Wireless Power Transfer (WPT), refers to the conversion of electrical energy into other forms of relay energy (such as electromagnetic field energy, light energy, and microwave energy, etc.) , and then through the receiving device to convert the relay energy into electric energy technology, the commercialization of wireless charging technology is progressing very rapidly. Among them, the wireless charging technology of consumer electronics products, for example, has been applied in smart terminals, electric toothbrushes and other products. Relatively mature, in addition to consumer electronics, the field of electric vehicles is also vigorously developing wireless charging technology. When the wireless charging technology is gradually transformed from the laboratory to the market application, one of the key problems that needs to be solved is the problem of foreign object detect...

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Abstract

The invention provides a foreign matter detection method for a wireless charging system, and the method comprises the steps: determining a first frequency and a second frequency according to the actual resonant frequency of a resonant network, and determining a difference voltage between a resonant network voltage and a preset voltage at the first frequency and the second frequency, comparing the absolute value of the difference value of the two difference value voltages at the two different frequencies with a preset threshold value, and determining whether there is foreign matter. The invention further provides a foreign matter detection device. By using the foreign matter detection method or device provided by the embodiment of the invention, the precision of foreign matter detection can be improved, and misjudgment is reduced.

Description

technical field [0001] The present application relates to the technical field of wireless charging, and in particular to a method and device for detecting foreign objects in wireless charging. Background technique [0002] In the current wireless charging technology, the two technical solutions of magnetic induction coupling and resonant coupling are the most widely used. These two technical solutions are based on the principle of electromagnetic induction. The high-frequency alternating current of the transmitting coil generates a high-frequency magnetic field, and the energy is transmitted from the transmitting coil to the receiving coil through the high-frequency magnetic field to realize wireless charging. A common wireless charging system consists of a power transmitting device connected to the mains and a power receiving device connected to the load. There is no electrical contact between the power transmitting device and the power receiving device, and wireless energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J50/12H02J50/60H02J7/02B60L53/124
CPCH02J50/12H02J50/60B60L53/124H02J7/02Y02T10/70Y02T10/7072Y02T90/14
Inventor 陈双全武志贤
Owner HUAWEI TECH CO LTD
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