CN201556937U - Network lightning protection device - Google Patents

Abstract

The utility model discloses a network lightning protection device, comprising a circuit installed in a shell. The shell is formed by sequentially connecting a network input slot, a transient over-voltage protection circuit, an isolation protection circuit, a spike voltage protection circuit and a network output slot in serial. The network input slot V1 is a socket; the transient over-voltage protection circuit comprises four gas discharge tubes and four network cables; one end of the gas discharge tube is connected with the network cable, and the other end is grounded; the spike voltage protection circuit comprises four diode pairs and the four network cables, the cathodes of each diode pair are connected with each other, one anode of the diode is connected with the network cable, and the anode of the other diode is grounded; the isolation protection circuit is formed by connecting four resistors R with large power and small resistance and four network cables in serial; the network output slot is a plug. The network lightning protection device can protect the network from the lightning damage when being used in network.

Description

Network ' s thunder hits protector

Affiliated technical field

The utility model relates to a kind of network protector, is specifically related to network ' s thunder and hits protector.

Background technology

Along with the continuous development of science and technology and the increase of information requirement; the network user is more and more; and at present a lot of network facilitiess are distributed in some modern high buildings and large mansions; facility in each building connects by netting twine; and the relatively weak place of lightning protection often, high-altitude; the built on stilts netting twine that lays the turnover building exposes for a long time; be distributed in outside the scope of the lightning protection device of high building protection own, so the high induction voltage that causes on internetwork line at thunderstorm season Chang Fashengyin thunder and lightning enters the situation of the network facilities.If do not take good lightning protection measures, in case meet with thunderbolt, the network facilities just is easy to burn.The induced voltage that is caused is not enough to the disposable network equipment that smashes even if be struck by lightning sometimes, but if often impacted by overvoltage, is easy to cause the aging of equipment part, causes sharply descend useful life.

Summary of the invention

The purpose of this utility model is to provide a kind of safe and reliable network ' s thunder to hit protector, make expose the built on stilts netting twine that lays the turnover building also can operate as normal when thunderbolt, can not broken by thunderbolt.

For realizing that the technical scheme that the purpose of this utility model adopted is: the anti-lightning strike protector of present networks is made up of a circuit that is installed in the housing, described circuit by 1, network input port slot V1,2, instantaneous overvoltage protective circuit, 3, isolation protective circuit, 4, peak voltage protective circuit, 5, network delivery outlet slot V2 successively connect in series form; Network input port slot V1 and network delivery outlet slot V2 are installed on the housing; Described network input port slot V1 is a socket, is used for that input port is reticle plug provided to be connected with it; Described network delivery outlet slot V2 is a plug, is used for output port netting twine socket and is connected with it; Described instantaneous overvoltage protective circuit is made up of four gas discharge tube A1, A2, A3, A4 and four netting twine L1, L2, L3, L4, one end of each gas discharge tube is connected with a netting twine respectively, other end ground connection, be used for the instantaneous induction overvoltage that thunderbolt the time is produced on netting twine is carried out voltage-limiting protection, the voltage limit that the netting twine indirect lightning strike is produced is below 3.5v; Described peak voltage protective circuit is made up of four couples of paired diode VD1～VD8 and netting twine L1, L2, L3, L4, the negative pole of the diode that each is paired connects mutually, the positive pole of one of them diode with connect with netting twine L1, L2, L3, L4 respectively, the plus earth of another diode is used for amplitude limitation with spike at 0.8v～1.2v; Described isolation protective circuit is composed in series with netting twine L1, L2, L3, L4 respectively by four resistance R of high-power little impedance; four netting twine L1, L2 of its input, L3, L4 each with the output coupled of the corresponding netting twine of instantaneous overvoltage protective circuit; each connects four netting twine L1, L2 of output, L3, L4 with the input of the corresponding netting twine of peak voltage protective circuit; be used to isolate instantaneous overvoltage protective circuit and peak voltage protective circuit, the resistance R of described high-power little impedance is that the order of magnitude of power is W and the order of magnitude of impedance is the resistance of Ω.

This circuit to the principle that network ' s thunder hits effect is: gas discharge tube is used for the instantaneous overvoltage protection; discharge tube is to utilize microgap to carry out the element of electric field discharge; be between the wide microgap electrode of tens of microns, to discharge; under normal circumstances; discharge tube is because of its distinctive high impedance (1000M Ω) and low electric capacity (2pF) characteristic; it as the protection component line attachment in the time, to the operate as normal of circuit almost without any adverse effect.When harmful indirect lightning strike voltage is scurried into; the at first breakdown discharge of discharge tube; its impedance descends rapidly; almost become short-circuit condition; at this moment; discharge tube is released harmful current by ground wire; simultaneously with voltage limit lower time (being generally about 0.2 μ s); thereby there is a higher spike meeting of amplitude to leak; in the circuit of back, can produce a peak voltage; this voltage magnitude is selected with circuit and device and different; lie prostrate between hundreds of volts about tens of; voltage width is exactly the needed time of gas discharge tube gas ionization, so also need a peak voltage protective circuit after the instantaneous overvoltage protective circuit, its effect is limited in the amplitude of above-described spike in the safe range exactly.Method among paired 2 diodes such as Fig. 2 is serially connected and has just constituted a two-way transient voltage and suppress circuit, and the amplitude with spike is limited in the 12.3V reliably.Resistance R in the isolation protective circuit is selected the resistance of high-power little impedance for use, and (2.2 Ω/2W), it can bear very big transient power, can provide isolation for instantaneous overvoltage protective circuit and peak voltage protective circuit.

The beneficial effects of the utility model are: owing to inserted this lightning proof in network system; its instantaneous overvoltage protective circuit can be limited in when thunderbolt below the 3.5v at the instantaneous induction overvoltage that is produced on the netting twine; its peak voltage protective circuit can be with the amplitude limitation of spike at 0.8v～1.2v; so can make expose built on stilts lay the netting twine that debouches building also can operate as normal when thunderbolt, can not broken by thunderbolt.

Description of drawings

Fig. 1 is a circuit block diagram of the present utility model;

Fig. 2 is the circuit diagram of the utility model device embodiment.

Respectively be labeled as among the figure: 1, network input port slot V1,2, the instantaneous overvoltage protective circuit, 3, isolation protective circuit, 4, the peak voltage protective circuit, 5, network delivery outlet slot V2.

Embodiment

The utility model is described in further detail below in conjunction with Fig. 2 and embodiment, but embodiment is not to restriction of the present utility model.

Embodiment: see Fig. 2, network input port slot V1 interface of this device and network delivery outlet slot V2 interface adopt RJ45, and the RJ45 interface is 8 pins, but have only 1 in actual the use; 2,3,6 four pins are useful, so this circuit is only to 1; 2,3,6 four pins have been done protection, and other four pins are unsettled.The instantaneous overvoltage protective circuit is made up of gas discharge tube A1, A2, A3, A4 and four netting twines; A1, A2, A3, A4 one end are connected with netting twine L1, L2, L3, L4 respectively; the other end is ground connection all; A1～A4 selects gas discharge tube 2R75 for use; its distinctive high impedance (1000M Ω) and low electric capacity (2pF) characteristic; it as the protection component line attachment in the time, to the operate as normal of circuit almost without any adverse effect.Isolation protective circuit is composed in series by resistance R 1, R2, R3, R4 and netting twine L1, L2, L3, L4, and resistance R 1～R4 adopts the resistance of high-power little impedance, and (2.2 Ω/2W), it can bear very big transient power.What the peak voltage protective circuit was selected for use is the voltage stabilizing didoe (IN4742) of 12V/1W, is made up of VD1～VD8, wherein the positive pole of diode VD1, VD3, VD5, VD7 and netting twine L1, L2, the corresponding connection of L3, L4; The negative pole of diode VD1, VD3, VD5, VD7 links to each other with the negative pole of VD2, VD4, VD6, VD8; The positive pole of VD2, VD4, VD6, VD8 is ground connection all, constitutes a two-way transient voltage and suppress circuit, and the amplitude with spike is limited in the 12.3V reliably.

Claims (1)

1. network ' s thunder hits protector, be made up of a circuit that is installed in the housing, it is characterized in that: described circuit is made up of network input port slot V1 (1), instantaneous overvoltage protective circuit (2), isolation protective circuit (3), peak voltage protective circuit (4), network delivery outlet slot V2 (5) connect in series successively; Network input port slot V1 and network delivery outlet slot V2 are installed on the housing; Described network input port slot V1 is a socket, is used for that input port is reticle plug provided to be connected with it; Described network delivery outlet slot V2 is a plug, is used for output port netting twine socket and is connected with it; Described instantaneous overvoltage protective circuit is made up of four gas discharge tube A1, A2, A3, A4 and four netting twine L1, L2, L3, L4, one end of each gas discharge tube is connected with a netting twine respectively, other end ground connection, be used for the instantaneous induction overvoltage that thunderbolt the time is produced on netting twine is carried out voltage-limiting protection, the voltage limit that the netting twine indirect lightning strike is produced is below 3.5v; Described peak voltage protective circuit is made up of four couples of paired diode VD1～VD8 and netting twine L1, L2, L3, L4, the negative pole of the diode that each is paired connects mutually, the positive pole of one of them diode with connect with netting twine L1, L2, L3, L4 respectively, the plus earth of another diode is used for amplitude limitation with spike at 0.8v～1.2v; Described isolation protective circuit is composed in series with netting twine L1, L2, L3, L4 respectively by four resistance R of high-power little impedance; four netting twine L1, L2 of its input, L3, L4 each with the output coupled of the corresponding netting twine of instantaneous overvoltage protective circuit; each connects four netting twine L1, L2 of output, L3, L4 with the input of the corresponding netting twine of peak voltage protective circuit; be used to isolate instantaneous overvoltage protective circuit and peak voltage protective circuit, the resistance R of described high-power little impedance is that the order of magnitude of power is W and the order of magnitude of impedance is the resistance of Ω.

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