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Electric over-stress prevention circuit and terminal

A protection circuit, overstress technology, applied in the field of electronics, can solve problems such as high cost and complex implementation

Active Publication Date: 2019-10-11
HUAQIN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this solution, although the number of TVS tubes used is reduced, TVS tubes must still be used, and resistors need to be connected in series on each signal line, and at least 6pcs of resistors need to be added, so there are also high cost and implementation problems. more complex defects

Method used

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  • Electric over-stress prevention circuit and terminal
  • Electric over-stress prevention circuit and terminal
  • Electric over-stress prevention circuit and terminal

Examples

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Embodiment Construction

[0029] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the following The described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0030] In the present invention, the terminal mentioned may refer to a wireless terminal or a wired terminal. Such as computers, mobile phones, tablets, etc.

[0031] Peripherals of the terminal are generally connected through interfaces in the terminal. For example, peripheral devices such as a mouse and a keyboard may be connected to ...

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PUM

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Abstract

The invention relates to the field of the electronic technology, and discloses an electric over-stress prevention circuit and a terminal. The electric over-stress prevention circuit comprises a switchunit and a discharging unit, wherein the switch unit is connected between a first pin and a second pin; an insertion detection pin is connected to the control end of the switch unit for controlling the connection or the disconnection of the switch unit; after the insertion detection pin detects the insertion of a peripheral, a high level is output, and the switch unit is connected; when the insertion detection pin detects that the peripheral is pulled out, a low level is output, and the switch unit is disconnected; and the discharging unit is connected between the second pin and the insertiondetection pin and is conducted when the second pin is under the high level and the insertion detection pin is under the low level, and therefore, the second pin discharges through the insertion detection pin. By use of the embodiment of the invention, at a moment when the peripheral is pulled out, quick discharging can be carried out through the insertion detection pin, and a system end can be protected from any EOS (Electrical Over Stress) damage.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to an electrical overstress protection circuit and a terminal. Background technique [0002] At present, many electronic devices need to be connected to other external devices, and thus are equipped with corresponding external interfaces. When other devices are plugged into the external interface, the external interface may be damaged due to electrical overstress (Electrical OverStress, EOS for short), such as surge and direct current. When the external surge or direct current exceeds the withstand voltage or current capacity of the external interface, it will burn the devices on the external interface circuit, making the interface function invalid, and there are potential safety hazards. [0003] Therefore, it is necessary to design a protection circuit to avoid the EOS state occurring at the input / output / power pin from damaging the internal circuit and causing permanent damag...

Claims

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Application Information

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IPC IPC(8): H02H9/00
CPCH02H9/005H02H9/004
Inventor 封梅泉
Owner HUAQIN TECH CO LTD
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