Protective circuit, communication equipment and method for protecting device in communication equipment

Abstract

The embodiment of the invention discloses a protective circuit. The protective circuit comprises a transformer, wherein a secondary winding of the transformer is connected with a device 10; primary windings of the transformer are connected with an external connection line a and an external connection line b; a high-pass filtering device 30 is connected between the external connection line a and the primary winding c of the transformer; a high-pass filtering device 50 is connected between the external connection line b and the primary winding d; a protective device v1 and a protective device v2 are connected between the external connection line a and the external connection line b; an earth wire is arranged between the protective device v1 and the protective device v2; and the protective device v1 and the protective device v2 are positioned among the high-pass filtering device 30, the high-pass filtering device 50, the external connection line a and the external connection line b. The embodiment of the invention also discloses communication equipment with the protective circuit and a method for protecting the communication equipment. The protective circuit realizes low voltage protection through the high-pass filtering devices, realizes high voltage protection through the protective device v1 and the protective device v2, and can well protect the device on the secondary side of the transformer without labor maintenance.

Description

technical field [0001] The present invention relates to antistatic and lightning protection technologies in the communication field, and in particular, the present invention relates to a protection circuit, a communication device and a protection method for components in the communication device. Background technique [0002] Commonly used balanced twisted pair signal interfaces on communication equipment, such as analog subscriber ports, ADSL (Asymmetric Digital Subscriber Line), VDSL (Very High Bit Rate DSL), etc., when the outdoor transmission distance is more than 1000 meters, the lightning electromagnetic pulse can These signal lines and their loops induce relatively large transient overvoltages. In addition, the collision between high-voltage power line induction and 220V mains will also cause relatively high power frequency voltages on these signal interfaces. The transient overvoltage and power frequency point voltage can easily damage the devices on the secondary si...

AI Technical Summary

Problems solved by technology

[0005] In actual use, the balanced signal line is often affected by power line induction, power line touch or lightning, and fuses F1 and F2 are used for overcurrent protection. When fuses F1 and F2 are blown, it is usually necessary to manually replace the fuses. Increased labor maintenance costs in actual use

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