Lightning protection circuit and lightning protection method for direct-current power supply port of communication equipment

Abstract

The invention discloses a lightning protection circuit and a lightning protection method for direct-current power port of communication equipment, which relate to the application field of communication equipment products. The circuit comprises a differential-mode first-stage lightning protection circuit, an uncoupling network, a differential-mode second-stage lightning protection circuit and a common-mode lightning protection circuit, wherein the differential-mode first-stage lightning protection circuit roughly limits the abruptly changing voltage of the direct-current power supply of the communication equipment, the uncoupling network forms a time-lag effect on the abruptly changing voltage and current of the direct-current power supply of the communication equipment, and carries out the function of uncoupling between the differential-mode first-stage lightning protection circuit and the differential-mode second-stage lightning protection circuit, the differential-mode second-stage lightning protection circuit accurately limits the residue of differential-mode first-stage lightning voltage, so that the direct-current power supply of the communication equipment can be protected from the surge of over-voltage and over-current energy, and the common-mode lightning protection circuit connects the abruptly changing current of the direct-current power supply of the communication equipment with protective earth (PE). The efficiency of lightning protection is high, the lasting time of residual voltage is short, the risk that the direct-current power port of the communication equipment is damaged by lightning can be decreased, and the lightning protection circuit not only is safe, but also has a wide application range, and is convenient to use by people.

Description

technical field [0001] The invention relates to the application field of communication equipment products, in particular to a lightning protection circuit and method for a DC power port of communication equipment. Background technique [0002] With the rapid development of information technology, communication operators have higher and higher requirements for the use environment of communication equipment. Many office (station) communication equipment (hereinafter referred to as communication equipment) are connected to unmanned stations, outdoor cabinets, poles, etc. Used in outdoor scenes. [0003] The functional circuit of the DC power port of the existing communication equipment includes a main-standby power combination control circuit, an electromechanical management circuit, a DC / DC (direct current chopper) isolated power circuit, an EMI (Electromagnetic Interference, electromagnetic interference) circuit, and the like. When the functional circuit of communication equ...

AI Technical Summary

Problems solved by technology

Due to the space limitation of the components of the communication equipment, the DC power port of the communication equipment used in the outdoor scene cannot use a single protective device to complete the lightning protection function. Therefore, it is difficult to use the communication equipment with a single protective device in the outdoor scene. Its scope of application is relatively single, and it is difficult to meet the needs of communication operators

[0006] (2) Although the multi-level voltage limiting and decoupling circuit can protect the communication equipment in the outdoor scene, the lightning protection efficiency is low, the high residual voltage and the maintenance time of the residual voltage are long, and the multi-level voltage limiting and Decoupling circuit Huge circuits and components are difficult to be compatible in miniaturized communication equipment

Therefore, when multi-level voltage limiting and decoupling circuits are used for lightning protection of communication equipment, not only the efficiency of lightning protection is low, but also it can only be applied to communication equipment with a large size. Its scope of application is relatively single, and it is difficult to meet the needs of communication operators.

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