Lightning protection circuit of telecommunication terminal equipment

Abstract

The invention relates to a lightning protection circuit of telecommunication terminal equipment, and belongs to the technical field of lightning protection circuits. The lightning protection circuit of the telecommunication terminal equipment comprises an input end and an output end; the input end is connected with a piezoresistor in parallel; ceramic gas discharge tubes are also connected between the piezoresistor and the input end in parallel; discharge pins of the ceramic gas discharge tubes are grounded; inductance elements are respectively connected on two circuits connected with the piezoresistor and the output end in series, and the inductance elements and the output end are connected with a semiconductor discharge tube in parallel. Therefore, the lightning protection circuit adopts triple protection, can prevent surge voltage and surge current, is safer and more reliable, and can meet the lightning protection demand of the telecommunication terminal equipment.

Description

technical field [0001] The invention relates to an anti-lightning protection circuit, in particular to an anti-lightning protection circuit for telecommunication terminal equipment. Background technique [0002] Thunderstorm weather has caused a certain degree of threat to the use of telecommunications terminal equipment, especially in areas where thunderstorms are frequent, lightning damage to telecommunications terminal equipment often occurs, and even personnel are injured. There are lightning protection requirements, that is, telecommunication terminal equipment must have lightning protection functions. [0003] The traditional lightning protection circuit for telecommunication terminal equipment is to connect a varistor in parallel at the input end. This can't really play a role in lightning protection, because the varistor is generally only used to prevent overvoltage, and it cannot protect against many inductive lightning strikes accompanied by large surge currents, ...

AI Technical Summary

Problems solved by technology

In this lightning protection protection module, the gas discharge tube is not grounded, so it can only be used for protection of Class II equipment such as telephones, and cannot be used for the protection of outdoor telecommunication terminal equipment; the varistor is located at the back end of the inductor and has parasitic capacitance. Inductors together form a delay circuit. After multiple impacts by high-voltage waves, the high-voltage waves will not be released in time, which will cause equipment damage; according to the characteristics of varistors, after multiple surges, the leakage current will increase. increase, the response time will be longer, and the parasitic capacitance will also increase. The delay effect of the LC circuit will further lengthen the response speed of the varistor, and the clamping voltage of the varistor is higher. In practical applications, if there are more lightning strikes or If the lightning strike lasts for a long time, the performance of the varistor will be reduced or even damaged, and the residual wave of the lightning strike cannot be completely absorbed, which will cause damage to the internal components of the equipment and cause equipment failure.

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