CN203774782U - Lightening protection device for communication port - Google Patents

Lightening protection device for communication port Download PDF

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Publication number
CN203774782U
CN203774782U CN201320889780.0U CN201320889780U CN203774782U CN 203774782 U CN203774782 U CN 203774782U CN 201320889780 U CN201320889780 U CN 201320889780U CN 203774782 U CN203774782 U CN 203774782U
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CN
China
Prior art keywords
communication
interface
communication port
power source
circuit
Prior art date
Application number
CN201320889780.0U
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Chinese (zh)
Inventor
刘林
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上海旋思科技有限公司
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Priority to CN201320889780.0U priority Critical patent/CN203774782U/en
Application granted granted Critical
Publication of CN203774782U publication Critical patent/CN203774782U/en

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Abstract

The utility model relates to a lightening protection device for a communication port. The lightening protection device is arranged in an interface circuit of the communication port. The interface circuit comprises a processor CPU and a communication interface which is communicated with the CPU. The lightening protection device comprises a gas discharge unit and an electrostatic protection unit which are connected in parallel between the two poles of the communication interface, and a self-recovery fuse which is respectively connected in series with the two poles of the communication interface. The self-recovery fuse is connected in series between the gas discharge unit and the electrostatic protection unit. Compared with devices in the prior art, the electrostatic protection unit, the gas discharge unit and the self-recovery fuse are additionally arranged in the communication interface so that surge energy can be effectively prevented from being outputted to the internal part of communication equipment, and impact and damage to the equipment can be avoided when lightning surge occurs or a lightning surge test is performed on the equipment, and thus various lightning surge tests can be completely met.

Description

The lightning proof of communication port
Technical field
The utility model relates to a kind of communication port, particularly a kind of lightning proof of communication port.
Background technology
Fault in simulating grid, thunderbolt (directly or indirectly) is to the switching manipulation in the interference of equipment, electrical network.Discharge waveform is the pulse of open circuit voltage 1.2us/50us, short circuit current 8us/20us.Feature is that rise time slow (EFT/B relatively), duration are large compared with length, energy.
And, because at present conventional communication apparatus is all very weak for the tolerance of overvoltage overcurrent, and because many communication apparatus are all arranged on open air.When lightning surge arrives, surge energy is easy to be transferred to communication apparatus the inside, thereby causes the damage of equipment, even brings larger harm.So generally install some lightning-protection surge devices additional at power supply and signal wire interface place in order to overcome the generation of above-mentioned phenomenon.
And that total class of the device of current lightning-protection surge has is several as follows: piezo-resistance, TVS pipe (transient voltage suppressor diode), gas discharge tube and solid discharging tube etc.If as these components and parts are attached to power supply and signal wire interface place, although can reduce certain surge phenomenon, its effect is also not obvious.
Utility model content
The utility model, in order to overcome the deficiencies in the prior art, has designed a kind of lightning proof of communication port, to meet the test of various lightning surges, while effectively preventing that lightning surge from arriving, causes damage to the inside of communication apparatus.
To achieve these goals, the utility model provides a kind of lightning proof of communication port, and described lightning proof is arranged in the interface circuit of described communication port;
Described interface circuit comprises: processor CPU, the communication interface that carries out communication with described CPU;
Described lightning proof comprises: be connected in parallel on gas discharge unit between described communication interface the two poles of the earth, be connected in parallel on the electrostatic protection unit between described communication interface the two poles of the earth, the resettable fuse of connecting with the two poles of the earth of described communication interface respectively;
Wherein, described resettable fuse is connected between described gas discharge unit and described electrostatic protection unit.
Execution mode of the present utility model in terms of existing technologies, owing to installing electrostatic protection unit, gas discharge unit and resettable fuse additional in communication interface.When lightning surge arrives, or it is carried out to lightning surge when test, can effectively prevent that surge energy from outputing to communication apparatus inside, avoid equipment itself to impact, it is caused to breaking-up, can meet various lightning surge tests completely.
Further, the lightning proof of described communication port also comprises: a power circuit that drives described interface circuit; Wherein, described power circuit comprises the first modular power source being connected with the CPU of described interface circuit; The second modular power source being connected with the communication interface of described interface circuit; Described the first modular power source and described the second modular power source are isolated mutually.Because interface circuit is by two modular power sources, it to be driven, wherein a road power supply, for powering to CPU, can carry out data processing; And another road power supply is for powering to communication interface, can transmit and receive data, two pack module power supplys work alone completely.So when disturb surpassing to a certain degree, and while causing it to burn in communication apparatus photoelectric isolated chip or modular power source, can not affect other communication interface of whole equipment and normally move.
Wherein, in order to meet the demand in market, described the first modular power source and described the second modular power source are AC/DC modular power source or DC/DC modular power source.
Further, described gas discharge unit is ceramic gas discharge tube GDT.Thereby when communication apparatus runs into lightning surge; ceramic gas discharge tube can increase the voltage between communication interface the two poles of the earth; pole clearance is by discharge breakdown; by original state of insulation, be converted into conduction state; similar short circuit; thereby make the voltage that under conduction state, two interpolars maintain very low, play the effect of protection late-class circuit.
Further, in order to meet the demand in market, described electrostatic protection unit is transient voltage suppressor diode TVS or electrostatic defending diode ESD.When running into lightning surge; transient voltage suppressor diode TVS in communication interface or electrostatic defending diode ESD can be not breakdown; can when voltage is high, reduce resistance, the inner member of protection communication interface is not burnt in the situation that transient voltage is too high.Even if the voltage-stabiliser tube in interface circuit is breakdown, but after puncturing, the voltage at its two ends can remain unchanged, thereby makes circuit stable, and voltage stabilization, open circuit or short-circuit conditions can not occur, and have protected other inner member in interface circuit.
And in order to meet the need of market, described resettable fuse is polymer macromolecule PPTC resettable fuse or ceramic CPTC resettable fuse.Under normal circumstances, resettable fuse is low resistive state, and assurance circuit is normally worked.When circuit is short-circuited or scurries into abnormal large electric current, the self-heating of resettable fuse increases its impedance, and current limit, to enough little, is played to overcurrent protection.When ambient temperature rises suddenly, ambient temperature arrives after product switch temperature, can play overheat protector effect simultaneously.
In addition, described interface circuit also comprises: rapid light coupling; Described communication interface carries out communication by described rapid light coupling and described CPU.By rapid light coupling, can realize the mutual conversion of light signal and the signal of telecommunication between communication interface and CPU.
In addition, in order to meet the need of market, lightning proof of the present utility model can be applicable to polytype communication interface and comprises the communication interfaces such as 100 m ethernet interface RJ45, serial ports RS485 and serial ports RS232.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of power circuit in the communication port lightning proof of the utility model the first execution mode;
Fig. 2 is that in the utility model the first execution mode, communication port is the circuit theory diagrams of employing 100 m ethernet interface;
Fig. 3 is that in the utility model the second execution mode, communication port is the circuit theory diagrams of employing RS485 interface;
Fig. 4 is that in the utility model the 3rd execution mode, communication port is the circuit theory diagrams of employing RS232 interface.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, each execution mode of the present utility model is explained in detail.Yet, persons of ordinary skill in the art may appreciate that in each execution mode of the utility model, in order to make reader understand the application better, many ins and outs have been proposed.But, even without these ins and outs and the many variations based on following execution mode and modification, also can realize each claim of the application technical scheme required for protection.
The first execution mode of the present utility model relates to a kind of lightning proof of communication port, and this lightning proof is arranged in the interface circuit of communication port, and interface circuit is by power circuit, it to be powered, and makes it carry out work.
Wherein interface circuit, as shown in Figure 1, comprises: processor CPU, communication interface and optocoupler.CPU is connected with communication interface by optocoupler.Rapid light coupling is responsible for the mutual conversion of optical, electrical signal between CPU and communication interface, meets the demand of signal transmission.
And lightning proof comprises: be connected in parallel on gas discharge unit and electrostatic protection unit between communication interface the two poles of the earth; also comprise the resettable fuse of connecting with the two poles of the earth of communication interface respectively, and resettable fuse is connected between gas discharge unit and electrostatic protection unit.
Specifically, that the interface circuit of present embodiment adopts is 100 m ethernet interface RJ45, as shown in Figure 2, wherein communication interface RJ45 has two Ethernet interfaces, and gas discharge unit adopts, be ceramic gas discharge tube GDT, be directly parallel between the two poles of the earth of each Ethernet interface and form the first order protection to Ethernet interface.When communication apparatus runs into lightning surge; ceramic gas discharge tube GDT can increase the voltage between Ethernet interface the two poles of the earth; pole clearance is by discharge breakdown; by original state of insulation, be converted into conduction state; similar short circuit; thereby make the voltage that under conduction state, Ethernet interface two interpolars maintain very low, play the effect of protection late-class circuit.
In addition, that electrostatic protection unit adopts is electrostatic defending diode ESD, is connected in parallel on equally between the two poles of the earth of Ethernet interface and forms the second level protection to Ethernet interface.When running into lightning surge, the electrostatic defending diode ESD in Ethernet interface can be not breakdown, can when voltage is high, reduce resistance, and other elements in protection Ethernet interface are not burnt in the situation that transient voltage is too high.Even if the voltage-stabiliser tube in Ethernet interface is breakdown, but after puncturing, the voltage at its two ends can remain unchanged, thereby makes circuit stable, and voltage stabilization, the situation of open circuit or short circuit can not occur, thereby plays the protective effect of other elements in docking port.
And resettable fuse is that PTO resettable fuse can adopt polymer macromolecule PPTO or ceramic OPTO material to make, is connected on and between ceramic gas discharge tube GDT and electrostatic defending diode ESD, forms third level protection.Under normal circumstances, resettable fuse is low resistive state, and assurance circuit is normally worked.When circuit is short-circuited or scurries into abnormal large electric current, the self-heating of resettable fuse increases its impedance, and current limit, to enough little, is played to overcurrent protection.When ambient temperature sharply rises, ambient temperature arrives after product switch temperature, can play overheat protector effect simultaneously.
In addition, it is worth mentioning that, in the present embodiment, as shown in Figure 1, interface circuit is to drive by power circuit.Specifically, power circuit comprises first modular power source being connected with the CPU of interface circuit, also comprise second modular power source being connected with the communication interface of interface circuit, two pack module power supplys are isolated mutually, respectively CPU and communication interface are powered alone.
Hence one can see that, and because interface circuit is by two modular power sources, it to be driven, wherein a road power supply, for powering to CPU, can carry out data processing and data analysis; And another road power supply is for powering to communication interface, can transmit and receive data, two pack module power supplys work alone completely.So surpass to a certain degree when disturbing, while likely causing it to burn the interior photoelectric isolated chip of communication apparatus or modular power source, can not affect the normal operation of whole other communication interfaces of equipment.
And in order to meet the demand in market, two pack module power supplys can be selected AC/DC modular power source or DC/DC modular power source simultaneously.
The second execution mode of the present utility model relates to a kind of lightning proof of communication port; the second execution mode and the first execution mode are roughly the same; its main distinction is: as shown in Figure 3; in the present embodiment; what communication interface adopted is RS485 interface, and that the employing of electrostatic protection unit is transient voltage suppressor diode TVS.
Wherein, ceramic gas discharge tube is protected as the first order, be connected in parallel between the two poles of the earth of RS485 interface, the protection of, common mode poor by ceramic gas discharge tube GDT.
And transient voltage suppressor diode TVS protects as secondary, be connected in parallel between the two poles of the earth of RS485 interface.Specifically, in the present embodiment, transient voltage suppressor diode TVS is provided with three groups altogether, and wherein first and second groups of TVS diodes are first connected, and then carry out in parallelly with the 3rd group of TVS diode, and then be together connected in parallel between the two poles of the earth of RS485 interface.
In addition; resettable fuse PTC protects as the third level; it is directly connected between the electrostatic protection unit and ceramic gas discharge tube GDT consisting of three groups of TVS diodes; by resettable fuse PTC, can play the time to GDT diode and TVS diode balance play, and metering function.
Specifically, due to when surge is beaten in test thunderbolt, be all generally that TVS diode first responds conducting, now ceramic gas discharge tube GDT, also without any action, probably directly punctures TVS diode.And if between GDT diode and TVS diode a resettable fuse PTC in parallel; by resettable fuse PTC, can postpone the whole response time by TVS diode structure; allow GDT diode and TVS diode sync response; GDT diode can directly be released surge to after a level like this; allow again TVS diode release once; allow residual voltage maintain in the compressive region of TVS diode, so just can reach the object to late-class circuit protection.
The 3rd execution mode of the present utility model relates to a kind of lightning proof of communication port, and the 3rd execution mode and the second execution mode are roughly the same, and its main distinction is: as shown in Figure 4, in the present embodiment, what communication interface adopted is RS232 interface.The operation principle that it is concrete and the second execution mode are basic identical, just no longer set forth here.
Persons of ordinary skill in the art may appreciate that the respective embodiments described above are to realize specific embodiment of the utility model, and in actual applications, can to it, do various changes in the form and details, and do not depart from spirit and scope of the present utility model.

Claims (8)

1. a lightning proof for communication port, described lightning proof is arranged in the interface circuit of described communication port;
Described interface circuit comprises: processor CPU, the communication interface that carries out communication with described CPU, is characterized in that: described lightning proof comprises:
Be connected in parallel on gas discharge unit between described communication interface the two poles of the earth, be connected in parallel on the electrostatic protection unit between described communication interface the two poles of the earth, the resettable fuse of connecting with the two poles of the earth of described communication interface respectively;
Wherein, described resettable fuse is connected between described gas discharge unit and described electrostatic protection unit.
2. the lightning proof of communication port according to claim 1, is characterized in that: the lightning proof of described communication port also comprises: a power circuit that drives described interface circuit;
Wherein, described power circuit comprises the first modular power source being connected with the CPU of described interface circuit; The second modular power source being connected with the communication interface of described interface circuit;
Described the first modular power source and described the second modular power source are isolated mutually.
3. the lightning proof of communication port according to claim 2, is characterized in that: described the first modular power source and described the second modular power source are AC/DC modular power source or DC/DC modular power source.
4. the lightning proof of communication port according to claim 1, is characterized in that: described gas discharge unit is ceramic gas discharge tube GDT.
5. the lightning proof of communication port according to claim 1, is characterized in that: described electrostatic protection unit is transient voltage suppressor diode TVS or electrostatic defending diode ESD.
6. the lightning proof of communication port according to claim 1, is characterized in that: described resettable fuse is polymer macromolecule PPTO resettable fuse or ceramic OPTO resettable fuse.
7. the lightning proof of communication port according to claim 1, is characterized in that: described interface circuit also comprises: rapid light coupling; Described communication interface carries out communication by described rapid light coupling and described CPU.
8. according to the lightning proof described in any one in claim 1 to 6, it is characterized in that: described communication interface is 100 m ethernet interface RJ45, serial ports RS485 or serial ports RS232.
CN201320889780.0U 2013-12-31 2013-12-31 Lightening protection device for communication port CN203774782U (en)

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Application Number Priority Date Filing Date Title
CN201320889780.0U CN203774782U (en) 2013-12-31 2013-12-31 Lightening protection device for communication port

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Application Number Priority Date Filing Date Title
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CN203774782U true CN203774782U (en) 2014-08-13

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104463022A (en) * 2014-10-31 2015-03-25 北京深思数盾科技有限公司 Hardware device with self-protection function
CN106532625A (en) * 2016-11-30 2017-03-22 深圳市泛海三江科技发展有限公司 Protection circuit module for network cable power supply channel, power supply channel, power supply equipment and power supply system
CN106786468A (en) * 2017-02-20 2017-05-31 广州中大南沙科技创新产业园有限公司 A kind of RS485 telecommunication equipment lightning protections and observation circuit
CN110416989A (en) * 2019-07-31 2019-11-05 东莞市卓品电子科技有限公司 Protective device and guard method applied to communication interface

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104463022A (en) * 2014-10-31 2015-03-25 北京深思数盾科技有限公司 Hardware device with self-protection function
CN106532625A (en) * 2016-11-30 2017-03-22 深圳市泛海三江科技发展有限公司 Protection circuit module for network cable power supply channel, power supply channel, power supply equipment and power supply system
CN106532625B (en) * 2016-11-30 2018-11-30 深圳市泛海三江科技发展有限公司 Protection circuit module, supplying channels, equipment and the system in Power-over-Ethernet channel
CN106786468A (en) * 2017-02-20 2017-05-31 广州中大南沙科技创新产业园有限公司 A kind of RS485 telecommunication equipment lightning protections and observation circuit
CN110416989A (en) * 2019-07-31 2019-11-05 东莞市卓品电子科技有限公司 Protective device and guard method applied to communication interface

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