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Metal foreign body detection method and mobile terminal

A metal foreign body and detection method technology, which is applied in the field of metal foreign body detection methods and mobile terminals, can solve the problems of high operational difficulty and complexity and low detection accuracy, and achieve the goal of reducing operational difficulty and complexity and improving detection accuracy Effect

Inactive Publication Date: 2018-05-18
VIVO MOBILE COMM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Embodiments of the present invention provide a metal foreign object detection method and a mobile terminal to solve the problems of low detection accuracy, difficult operation and high complexity when detecting metal foreign objects on the surface of the transmitting end of the wireless charging device in the prior art. The problem

Method used

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  • Metal foreign body detection method and mobile terminal
  • Metal foreign body detection method and mobile terminal
  • Metal foreign body detection method and mobile terminal

Examples

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no. 3 example

[0128] refer to Figure 5 , shows a block diagram of a mobile terminal according to an embodiment of the present invention, the mobile terminal includes a wireless charging device transmitting end 500, and the wireless charging device transmitting end 500 can implement the details of the metal foreign object detection method in Embodiment 1 to Embodiment 2, and achieve the same effect. Figure 5 The wireless charging device transmitter 500 shown includes:

[0129] The first calculation module 501 is used to calculate the calibrated resonance frequency of the resonant cavity of the transmitting end of the wireless charging device;

[0130] The second calculation module 502 is used to calculate the frequency difference between the half power point frequency of the calibrated upper side frequency and the half power point frequency of the calibrated lower side frequency when calculating the half power point of the resonator;

[0131] The third calculation module 503 is used to c...

no. 4 example

[0136] refer to Figure 6 , shows a block diagram of a mobile terminal according to an embodiment of the present invention, the mobile terminal includes a wireless charging device transmitting end 500, and the wireless charging device transmitting end 500 can implement the details of the metal foreign object detection method in Embodiment 1 to Embodiment 2, and achieve the same effect. Figure 6 The wireless charging device transmitter 500 shown includes:

[0137] The first calculation module 501 is used to calculate the calibrated resonance frequency of the resonant cavity of the transmitting end of the wireless charging device;

[0138] The second calculation module 502 is used to calculate the frequency difference between the half power point frequency of the calibrated upper side frequency and the half power point frequency of the calibrated lower side frequency when calculating the half power point of the resonator;

[0139] The third calculation module 503 is used to c...

no. 5 example

[0167] Figure 7 It is a schematic diagram of a hardware structure of a mobile terminal for implementing various embodiments of the present invention.

[0168] The mobile terminal 700 includes but not limited to: a radio frequency unit 701, a network module 702, an audio output unit 703, an input unit 704, a sensor 705, a display unit 706, a user input unit 707, an interface unit 708, a memory 709, a processor 710, and Power supply 711 and other components. Those skilled in the art can understand that, Figure 7 The structure of the mobile terminal shown in the above does not constitute a limitation to the mobile terminal, and the mobile terminal may include more or less components than those shown in the figure, or combine certain components, or arrange different components. In the embodiment of the present invention, the mobile terminal includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palmtop computer, a vehicle-mounted terminal, a...

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Abstract

The invention provides a metal foreign body detection method and a mobile terminal. The method includes the following steps that: the calibration resonant frequency of the resonant cavity of the transmitting end of a wireless charging device is calculated; the frequency difference of the half-power point frequency of the calibrated upper side frequency of the resonant cavity and the half-power point frequency of the calibrated lower side frequency of the resonant cavity under a half-power point is calculated; the ratio of the calibration resonant frequency to the frequency difference is calculated, so that the quality factor of the resonant cavity can be obtained; whether the quality factor is smaller than a preset quality factor threshold value is judged; and if the quality factor is smaller than the preset quality factor threshold value, it is determined that a metal foreign body exists on the surface of the interface of the transmitting end of the wireless charging device. Accordingto the metal foreign body detection method and the mobile terminal of the invention, the calibration resonant frequency of the resonant cavity of the transmitting end of the wireless charging deviceand the frequency difference of the half-power point frequency of the calibrated upper side frequency of the resonant cavity and the half-power point frequency of the calibrated lower side frequency of the resonant cavity under the half-power point are calculated, and therefore, the quality factor Q value can be obtained, it does not need to measure the power loss of the transmitting end and receiving end of the wireless charging device, the detection accuracy of the metal foreign body is improved, and the difficulty and complexity of operation can be reduced.

Description

technical field [0001] The invention relates to the technical field of wireless charging, in particular to a metal foreign object detection method and a mobile terminal. Background technique [0002] The current wireless charging technology mainly applies the wireless charging technology of the Qi standard of the Wireless Power Consortium (WPC) based on the principle of magnetic induction. In the process of wireless charging, if a metal object is placed between the primary coil of the transmitting end of the wireless charging device and the secondary coil of the receiving end, the alternating magnetic field will generate eddy currents in the metal, resulting in energy loss, causing heat and even safety accidents . [0003] At present, the method of detecting whether there is a metal foreign object between the transmitting end and the receiving end of the wireless charging device is mainly realized by detecting the power loss of the transmitting end: if the detected power lo...

Claims

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Application Information

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IPC IPC(8): G01V3/11
CPCG01V3/101
Inventor 巫志文
Owner VIVO MOBILE COMM CO LTD
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