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A protection circuit, method and mobile terminal

A mobile terminal and protection circuit technology, which is applied in electric vehicles, circuit devices, battery circuit devices, etc., can solve the problems of mobile terminals not being able to charge, accelerating the corrosion rate of USB ports, etc.

Active Publication Date: 2019-01-29
VIVO MOBILE COMM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present invention provide a protective circuit, method and mobile terminal to solve the problem in the prior art that when corrosive substances enter the USB port of the mobile terminal, compared with charging with low voltage, high-voltage charging will accelerate the corrosion rate of the USB port. Thus triggering the protection mechanism of the charger, shutting down the charging process, and causing the mobile terminal to fail to charge

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  • A protection circuit, method and mobile terminal
  • A protection circuit, method and mobile terminal
  • A protection circuit, method and mobile terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] refer to figure 1 , shows a schematic structural diagram of a protection circuit of the present invention, the protection circuit 10 includes: a processing module 11, a protection module 12 and a data port 13; wherein, the processing module 11 includes an acquisition sub-module 110, a monitoring module 111 and a signal sending module 112 .

[0019] The acquisition sub-module 110 is configured to acquire the first voltage of the protection module 12 .

[0020] The monitoring sub-module 111 is configured to monitor whether the mobile terminal is in a non-charging state according to the first voltage; monitor whether the data port 13 of the mobile terminal is corroded according to the first voltage and a first preset voltage state.

[0021] The signal sending sub-module 112 is configured to send a first signal to the protection module 12 when it is detected that the mobile terminal 10 is in a non-charging state; when it is detected that the data port 13 is in a corrosion...

Embodiment 2

[0027] refer to figure 2 , shows a schematic structural diagram of another protection circuit according to an embodiment of the present invention, wherein the protection module may include a pull-up circuit 221, a voltage divider circuit 222, and a charging circuit 223; Voltage bias circuit 225 and overvoltage circuit 226; Wherein,

[0028] The output end of the pull-up circuit 221 is connected to the first pin 2A of the data port 23, and the input end of the pull-up circuit 221 is connected to the third pin 2C of the processing module 21, wherein the first A pin 2A, such as a data pin. The pull-up circuit 221 is configured to input the first preset voltage to the first pin of the data port according to the received first signal, so that the first pin of the data port is high level; according to the received third signal, inputting the second preset voltage to the first pin of the data port, so that the first pin of the data port is at a low level.

[0029] The input end o...

Embodiment 3

[0041] refer to Figure 5 , shows a schematic structural diagram of another protection circuit according to an embodiment of the present invention; wherein, the processing module 51 includes an acquisition submodule 510, a monitoring submodule 511, and a signal sending submodule 512, as described in the first embodiment above , and will not be repeated here.

[0042] In this embodiment, the monitoring sub-module 511 includes: a first computing unit 5111 , a first status monitoring unit 5112 , a second computing unit 5113 and a second status monitoring unit 5114 .

[0043] The first calculation unit 5111 is configured to calculate a second voltage of the data port according to the first voltage.

[0044] The first state monitoring unit 5112 is configured to monitor whether the mobile terminal is in a non-charging state according to the second voltage.

[0045] The second calculation unit 5113 is configured to calculate the equivalent impedance of the data port according to th...

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Abstract

The embodiment of the invention provides a protection circuit, a method and a mobile terminal. The protection circuit comprises a processing module and a protection module, wherein the processing module is used for obtaining first voltage of the protection module, monitoring whether the mobile terminal is in an uncharged state or not according to the first voltage, transmitting a first signal to the protection module when monitoring that the mobile terminal is in the uncharged state, monitoring whether a data port of the mobile terminal is in a corrosion state or not according to the first voltage and first preset voltage and transmitting a second signal to the protection module when monitoring that the data port is in the corrosion state; and the protection module is used for outputting the first preset voltage to the data port when receiving the first signal and switching into a low-voltage charging mode from a high-voltage charging mode when receiving the second signal. The charging mode is switched into the low-voltage charging mode from the high-voltage charging mode when the condition that the data port is corroded is monitored, so that the corrosion rate of the data port is reduced.

Description

technical field [0001] The invention relates to the field of protection technology, in particular to a protection circuit, method and mobile terminal. Background technique [0002] With the continuous development of fast charging technology for mobile terminals and the needs of users for fast charging, more and more mobile terminals on the market use high-voltage fast charging instead of traditional charging methods. Among them, the charger specifications of traditional charging methods, such as 5V / 2A, while the charger specifications of common high-voltage fast charging methods, such as 9V / 2A, 12V / 2A. [0003] In the prior art, the charger monitors the level of the data signal D+ / D- of the USB port of the mobile terminal. When the level of the data signal D+ / D- reaches a threshold, the charger actively shuts down the charging process. Because in the same humid environment, compared with the traditional charging method, the high-voltage fast charging method is used to char...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00
CPCH02J7/007
Inventor 魏华兵王小军
Owner VIVO MOBILE COMM CO LTD