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Lightning proof protection module for telephone set

A protection module, lightning protection technology, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, electrical components, etc. and other problems, to achieve the effect of fast response speed and high withstand voltage

Inactive Publication Date: 2005-03-16
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current method is to use a varistor in the traditional telephone, but this cannot really play the role of lightning protection
Because the general lightning protection devices using varistors can only prevent overvoltage, they cannot prevent many inductive lightning strikes accompanied by large surge currents, and the resistance value of varistors will change after a large impact, preventing mine power down

Method used

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  • Lightning proof protection module for telephone set

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Embodiment Construction

[0009] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0010] The schematic diagram of the lightning protection module circuit for the telephone set of the present invention is as follows: figure 1 As shown, the protection module is composed of a gas discharge tube, a piezoresistor and two inductance elements. A ceramic gas discharge tube (R230) is connected in parallel at the input end to play the role of primary overvoltage protection. The small varistor (φ7, 221K) is used to absorb the residual wave that the gas discharge tube has not yet absorbed, and its response time is also faster, so that it can achieve double protection in terms of overvoltage. At the same time, two 2.2mH inductances are connected in series in the internal circuit, which are respectively connected between the ceramic gas discharge tube and the two ends of the piezoresistor, so that the damage to the telephone set by the s...

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Abstract

The invention is a telephone lightning stroke shielding protective module, composed of a gas discharge tube, a pressure sensitive resistance and two inductance components, where the gas discharge tube is connected in parallel with the input end to play the role in first-stage protection, the pressure sensitive resistance is connected with the output end to absorb the residual waves without being absorbed by the gas discharge tube, and thus it plays a double role in protecting and simultaneously connects in series two inductors in a circuit to inhibit the damage of surge current to the telephone. The circuit is placed in a small fire retardant plastic box and sealed and integrated as a telephone lightning stroke shielding module. It adopts double protection and prevents both surge voltage and current, therefore safer and more reliable and able to meet national test requirements on lightning stroke shielding property.

Description

technical field [0001] The invention relates to a lightning protection protection module for a telephone set, which is composed of gas discharge tubes, inductors and other components, and can effectively protect the telephone set from the impact of surge voltage and surge current. Background technique [0002] Thunderstorm weather poses a certain degree of threat to the use of telephones. In recent years, it has often been reported that people were injured or telephones were damaged by lightning during thunderstorms. Therefore, the Ministry of Information Industry has added lightning protection requirements to the national standard for telephones, that is, telephones must have Lightning function. The current method is to use a piezoresistor in the traditional telephone, but this cannot really play the role of lightning protection. Because the general lightning protection devices using varistors can only prevent overvoltage, they cannot prevent many inductive lightning stri...

Claims

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Application Information

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IPC IPC(8): H02H9/04H02H9/06
Inventor 李荣玉
Owner SHANGHAI JIAO TONG UNIV
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