CN203983982U - A kind of two-way bimodulus 485 communication lightning protection devices - Google Patents
A kind of two-way bimodulus 485 communication lightning protection devices Download PDFInfo
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- CN203983982U CN203983982U CN201420458393.6U CN201420458393U CN203983982U CN 203983982 U CN203983982 U CN 203983982U CN 201420458393 U CN201420458393 U CN 201420458393U CN 203983982 U CN203983982 U CN 203983982U
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Abstract
The utility model discloses a kind of two-way bimodulus 485 communication lightning protection devices, it comprises two main circuits that two ends are connected with 485 communication lines respectively, two resettable fuses of connecting respectively on described two main circuits, between described two main circuits, be provided with successively from left to right six parallel circuitss, the glass discharge vessel of connecting respectively on described first, Article 6 parallel circuits, the second, two glass discharge vessel of connecting respectively on Article 5 parallel circuits, the SM712 that connects on Article 3 parallel circuits manages, the two-way TVS pipe of connecting on Article 4 parallel circuits; Described Article 2 parallel circuits is provided with and connects SM712 Transient Suppression Diode earth lead; Described Article 5 parallel circuits is provided with earth connection.The utility model is a kind of 485 communication apparatus are subject to overvoltage and over-current shock to play effective protection, avoid 485 communication apparatus to be struck by lightning or the long-term online protector of induction overvoltage, over-current shock.
Description
technical fieldthe utility model belongs to 485 communication lightning protection device technical fields, relates to a kind of two-way bimodulus 485 communication lightning protection devices.
background technologythunderstorm weather can cause overvoltage or over-current shock to the equipment that adopts 485 communications, causes device damage normally to use, and especially outdoor 485 communication lines are when longer, be struck by lightning or the probability of induction overvoltage, overcurrent larger.Adopt piezo-resistance to prevent superpotential traditional lightening arresting method, the overvoltage to communication line both sides and overcurrent are effectively protected simultaneously, and lightning protection components and parts itself also can lose protective effect because of the damage of overvoltage or overcurrent.
summary of the inventionthe purpose of this utility model is the actual lightning protection needs for 485 communication apparatus, and the above-mentioned defect existing for overcoming prior art, provides a kind of two-way bimodulus 485 communication lightning protection devices.
To achieve these goals, a kind of two-way bimodulus 485 communication lightning protection devices of the utility model, it comprises two main circuits that two ends are connected with 485 communication lines respectively, two resettable fuses of connecting respectively on described two main circuits, between described two main circuits, be provided with successively from left to right six parallel circuitss, wherein the 3rd, the two ends of the Article 4 parallel circuits main circuit respectively and between two resettable fuses is connected, first, second, the 5th, the two ends of Article 6 parallel circuits are connected with the main circuit outside two resettable fuses respectively; The glass discharge vessel of connecting respectively on described first, Article 6 parallel circuits, the second, two glass discharge vessel of connecting respectively on Article 5 parallel circuits, the SM712 Transient Suppression Diode of connecting on Article 3 parallel circuits, the two-way TVS pipe of connecting on Article 4 parallel circuits; On described Article 2 parallel circuits, between two glass discharge vessel, be provided with the wire that connects SM712 Transient Suppression Diode Centronics port, wire is provided with earth connection; On described Article 5 parallel circuits, between two glass discharge vessel, be provided with earth connection.
The utility model is a kind of 485 communication apparatus are subject to overvoltage and over-current shock to play effective protection, avoid 485 communication apparatus to be struck by lightning or the long-term online protector of induction overvoltage, over-current shock.When use, be connected in 485 communication lines, can, in the situation that not affecting normal communication, be realized the overvoltage between two 485 connections is carried out to differential mode protection, also can be carried out common mode protection to the overvoltage between two 485 connections and the earth.
brief description of the drawingsaccompanying drawing 1 is the utility model electrical block diagram.
A, main circuit B, main circuit 1, Article 1 parallel circuits 2, Article 2 parallel circuits 3, Article 3 parallel circuits 4, Article 4 parallel circuits 5, Article 5 parallel circuits 6, Article 6 parallel circuits 7, resettable fuse 8, glass discharge vessel 9, SM712 Transient Suppression Diode 10, two-way TVS pipe in figure
, first order protection
, second level protection
, third level protection
embodimentwith reference to the accompanying drawings, a kind of two-way bimodulus 485 communication lightning protection devices of the utility model, it comprises two main circuit A that two ends are connected with 485 communication lines respectively, B, described two main circuit A, two resettable fuses 7 of connecting respectively on B, described two main circuit A, between B, be provided with successively from left to right six parallel circuitss 1, 2, 3, 4, 5, 6, wherein the 3rd, the main circuit of the two ends of Article 4 parallel circuits respectively and between two resettable fuses is connected, first, second, the 5th, the two ends of Article 6 parallel circuits are connected with the main circuit outside two resettable fuses respectively, the glass discharge vessel 8 of connecting respectively on described first, Article 6 parallel circuits, the second, two glass discharge vessel 8 of connecting respectively on Article 5 parallel circuits, the SM712 Transient Suppression Diode 9 of connecting on Article 3 parallel circuits, the two-way TVS pipe 10 of connecting on Article 4 parallel circuits, on described Article 2 parallel circuits, between two glass discharge vessel, be provided with the wire that connects SM712 Transient Suppression Diode 9 Centronics ports, wire is provided with earth connection, on described Article 5 parallel circuits, between two glass discharge vessel, be provided with earth connection.
operation principle of the present utility modelwith reference to accompanying drawing, the utility model is connected in two 485 communication lines, between two 485 communication lines, is respectively equipped with earth connection.Can, in the situation that not affecting normal communication, realize the overvoltage between two 485 connections is carried out to differential mode protection, also can carry out common mode protection to the overvoltage between two 485 connections and the earth.Lightning protection device arranges respectively at the input and output side of 485 communication lines the first order being made up of 3 glass discharge vessel and protects
, realize two kinds of protection modes of common and different mode, after first order protection, be symmetrical arranged respectively 2 resettable fuses and protect as the second level
, realize the combination of over-current protection and overvoltage protection, protect in the middle third level being formed by the two-way TVS pipe of low pressure and SM712 Transient Suppression Diode
, when realizing common and different mode at the corresponding levels protection, the voltage and current after first and second grade of protection further can be reduced in the scope that 485 communication apparatus can bear.Because the both sides of the utility model lightning protection device arrange the overvoltage protecting device that symmetrical withstand voltage is higher; can avoid third level protective element to suffer larger overvoltage and over-current shock simultaneously; avoid lightning protection device self to damage, can effectively extend the useful life of lightning protection device.
TVS pipe in the utility model is also referred to as Transient Suppression Diode or claim transient voltage twin zener dioder, it is the high-effect circuit protection device of one generally using in the world at present, its external form is identical with general-purpose diode, but can absorb the surge power up to thousands of watts, its main feature is under applied in reverse condition, in the time bearing a high-octane large pulse, its working impedance is down to extremely low conduction value immediately, thereby allow large electric current to pass through, simultaneously voltage clamping at predeterminated level, its response time is only 10-12 second, therefore, can effectively protect the precision components in electronic circuit.Suppress the reverse unidirectional TVS pipe of use, have the two-way TVS pipe of use of interchange.
SM712 Transient Suppression Diode in the utility model also claims lightning protection pipe or claims SPA diode.Littelfuse company is the leading enterprise of global circuit protection field, announces to have released SM712 series a few days ago
transient Suppression Diodearray (SPA diode), is intended to protect the RS-485 application with asymmetric operating voltage (7V is to 12V) to avoid the damage that Electrostatic Discharge, electric fast transient (EFT) and lightning induction surge cause.The highest level that SM712 series can specify in IEC61000-4-2 international standard absorbs repeatability esd discharge safely, and performance can not decline.And can under extremely low clamping voltage, dissipate safely up to the surge current of 19A.This device that meets AEC-Q101 standard can be guaranteed to be issued to high reliability in harsh industrial environment, thereby is very applicable to commercial Application, and the RS-485 port being included as in safety system, ATM (ATM) and testing equipment provides protection.
series Transient Suppression Diode array has following major advantage:
● outstanding power handling capability (600W) and the ESD surge protection strengthening.The power handling capability of SM712 series exceeds 50% than other solution of industry, and the statutory standard reaching all over the world to designer has brought the more degree of freedom.
● asymmetric off state voltage meets RS-485 transceiver specification, and this has guaranteed that data wire has minimum clamping voltage, and can not affect the normal work of circuit.
● low dynamic electric resistor (0.5 ohm TYP) provides protection modern electronic equipment required advanced clamp performance.
● the low capacitive load of the highest only 75pF contributes to the integrality of inhibit signal, can also in long distance R S-485 wiring, reduce to greatest extent loss of data.
● automotive grade quality (meeting AEC-Q101 standard) is guaranteed to be issued to high reliability at the most harsh environment.
Claims (1)
1. two-way bimodulus 485 communication lightning protection devices, it comprises two main circuits that two ends are connected with 485 communication lines respectively, two resettable fuses is characterized in that connecting respectively on described two main circuits, between described two main circuits, be provided with successively from left to right six parallel circuitss, wherein the 3rd, the two ends of the Article 4 parallel circuits main circuit respectively and between two resettable fuses is connected, first, second, the 5th, the two ends of Article 6 parallel circuits are connected with the main circuit outside two resettable fuses respectively; The glass discharge vessel of connecting respectively on described first, Article 6 parallel circuits, the second, two glass discharge vessel of connecting respectively on Article 5 parallel circuits, the SM712 Transient Suppression Diode of connecting on Article 3 parallel circuits, the two-way TVS pipe of connecting on Article 4 parallel circuits; On described Article 2 parallel circuits, between two glass discharge vessel, be provided with the wire that connects SM712 Transient Suppression Diode Centronics port, wire is provided with earth connection; On described Article 5 parallel circuits, between two glass discharge vessel, be provided with earth connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420458393.6U CN203983982U (en) | 2014-08-14 | 2014-08-14 | A kind of two-way bimodulus 485 communication lightning protection devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420458393.6U CN203983982U (en) | 2014-08-14 | 2014-08-14 | A kind of two-way bimodulus 485 communication lightning protection devices |
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| Publication Number | Publication Date |
|---|---|
| CN203983982U true CN203983982U (en) | 2014-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420458393.6U Expired - Fee Related CN203983982U (en) | 2014-08-14 | 2014-08-14 | A kind of two-way bimodulus 485 communication lightning protection devices |
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| CN (1) | CN203983982U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104134986A (en) * | 2014-08-14 | 2014-11-05 | 刘雨佳 | Two-way dual-mode 485 communication lightning protector |
-
2014
- 2014-08-14 CN CN201420458393.6U patent/CN203983982U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104134986A (en) * | 2014-08-14 | 2014-11-05 | 刘雨佳 | Two-way dual-mode 485 communication lightning protector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141203 Termination date: 20160814 |