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Electrostatic discharge protection circuit

An electrostatic discharge protection and circuit technology, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc., can solve the problem of low voltage tolerance, high influence or low level , It is difficult to select protective components, etc.

Inactive Publication Date: 2020-03-13
SHENXUN COMP KUNSHAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low voltage tolerance of the protected object to electrostatic discharge and the large error between the above-mentioned protective components, it is difficult to select a suitable protective component in the existing technology, and it may affect the detection of the protected object. The ability of the input / output pin to be high or low

Method used

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Embodiment Construction

[0008] Hereinafter, the present invention will be described in detail by illustrating various embodiments of the invention in the drawings. However, inventive concepts may be embodied in many different forms and should not be construed as limited to the illustrative embodiments set forth herein. Furthermore, the same reference numbers may be used to denote similar elements in the drawings.

[0009] In detail, the electrostatic discharge protection circuit provided by the embodiment of the present invention can be connected in series between any protected object and any external circuit. In a word, the present invention does not limit the specific implementation of the protected object and the external circuit. Those with common knowledge should be able to carry out relevant designs based on actual needs or applications. For the convenience of the following description, this embodiment is only described by taking the protected object as an example of a microcontroller (MCU), b...

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Abstract

The invention discloses an electrostatic discharge protection circuit. The electrostatic discharge protection circuit is connected in series between a protected object and an external circuit, and comprises an N-type field effect transistor and a diode. The N-type field effect transistor has a drain coupled to an input pin of the protected object, a source coupled to a ground voltage, and a gate coupled to an external circuit, and the diode has an anode coupled to the ground voltage, and a cathode which is coupled to the external circuit together with the gate of the N-type field effect transistor. By utilizing the electrostatic discharge protection circuit provided by the invention, an N-type metal-oxide-semiconductor field effect transistor and a Schottky diode can be respectively addedto the input / output pins of the protected object connected with other external circuits to serve as a new solution for electrostatic discharge of the protected object.

Description

【Technical field】 [0001] The invention relates to an electrostatic discharge (ESD) protection circuit connected in series between a protected object and an external circuit, and in particular to an electrostatic discharge protection circuit capable of increasing the voltage tolerance of the protected object to electrostatic discharge. 【Background technique】 [0002] Usually in the protection object, as long as there is an input / output pin (I / O Pin) in the microcontroller (MCU) that needs to be connected with other external circuits, the prior art must test electrostatic discharge, and the protection object and the external Protective components such as Zener diodes or transient voltage suppression (TVS) diodes are added between circuits as a solution for protecting objects against electrostatic discharge. However, due to the low voltage tolerance of the protected object to electrostatic discharge and the large error between the above-mentioned protective components, it is di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04
CPCH02H9/04
Inventor 杨士弘
Owner SHENXUN COMP KUNSHAN
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