Surge protection device suitable for outdoor communication line

Abstract

The invention discloses a surge protection device suitable for outdoor communication lines, which includes a first-level lightning protection circuit, a second-level lightning protection circuit and a third-level lightning protection circuit. The first-level lightning protection circuit is realized by a gas discharge tube. The connection method of the secondary lightning protection circuit is as follows: the first inductor and the first thermistor are connected in series to the A connection of the communication line, and the second inductor and the second thermistor are connected in series to the B connection of the communication line. Wiring; the connection mode of the three-stage lightning protection circuit is: four rectifier diodes are connected to form a bridge rectifier circuit, and the two input terminals of the bridge rectifier circuit are bridged between the A terminal and the B terminal of the communication line, TVS diodes are connected between the two output terminals of the bridge rectifier circuit. In the process of suppressing lightning attack, the present invention has fast enough response time, strong anti-electromagnetic interference ability, ensures that the components themselves are intact, and ensures the safe and stable operation of the communication terminal in the thunderstorm season.

Description

technical field [0001] The invention belongs to the technical field of lightning protection, and in particular relates to a surge protection device suitable for outdoor communication lines. Background technique [0002] Systems such as smart meters have been widely used in the fields of industry and life. The automatic meter reading technology is used in the electric meter to read data through the communication port, and in most cases, the remote reading method is used. The remote reading method is safe and saves time and money for the electric meter application. The key to realizing this technology is to ensure the safety of the communication line reliable. However, communication lines are usually exposed outdoors, so it is very easy to introduce overvoltage due to lightning strikes and other reasons. [0003] The State Intellectual Property Office of the People's Republic of China has disclosed a lightning protection device for communication lines, the publication number...

AI Technical Summary

Problems solved by technology

[0003] The State Intellectual Property Office of the People's Republic of China has disclosed a lightning protection device for communication lines, the publication number is: CN203707770U, and the publication date is: 2014.07.09. The first-level lightning protection circuit is realized by TED485 lightning protection tube, and the second-level lightning protection circuit is realized by TVS lightning protection tube. Among them, FL is TED485 lightning protection tube, and TS is TVS lightning protection tube. The connection relationship is: TED485 lightning protection tube FL1, The positive poles of TED485 anti-detonator FL2, TVS anti-detonator TS1 and TVS anti-detonator TS3 are connected and grounded, and the negative poles of TED485 anti-detonator FL1, TVS anti-detonator TS1 and the positive pole of TVS anti-detonator TS2 are connected to the 485A terminal , TVS detonator TS2, TVS detonator TS3 and TED485 detonator FL2’s negative poles are connected to 485B terminal; this patent adopts parallel connection to RS-485 bus, only need to connect the lightning protection module to RS-485 It only needs to be connected to the terminal, which does not affect the ability of the centralized meter reading terminal to communicate and carry loads, so as to ensure the safe and stable operation of the terminal during the thunderstorm season. improve

Images