CN101783495A - Protection device and protection method for preventing high voltage from invading communication bus - Google Patents
Protection device and protection method for preventing high voltage from invading communication bus Download PDFInfo
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- CN101783495A CN101783495A CN200910045438A CN200910045438A CN101783495A CN 101783495 A CN101783495 A CN 101783495A CN 200910045438 A CN200910045438 A CN 200910045438A CN 200910045438 A CN200910045438 A CN 200910045438A CN 101783495 A CN101783495 A CN 101783495A
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- 238000004891 communication Methods 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000001681 protective effect Effects 0.000 claims description 64
- 230000009545 invasion Effects 0.000 claims description 17
- 230000001629 suppression Effects 0.000 claims description 15
- 230000001052 transient effect Effects 0.000 claims description 15
- 230000002265 prevention Effects 0.000 claims description 10
- 230000001012 protector Effects 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 206010021750 Infantile Spasms Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000015556 catabolic process Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Abstract
The invention discloses a protection device and a protection method for preventing high voltage from invading a communication bus. The protection device comprises a shell and a protection circuit arranged in the shell; one side wall of the shell is provided with ends of a normal bus; another side wall of the shell is provided with ends of a bus preventing high voltage from invading, grounding ends and an indicator light D1; the protection circuit comprises a display alarm circuit, an anti-lightening circuit and an overcurrent protection circuit; two ends of the display alarm circuit are parallelly connected to two ends of the bus preventing the high voltage from invading; and the overcurrent protection circuit is respectively connected with two ends of the bus preventing the high voltage from invading and the ends of the normal bus. The protection device is connected in series in the bus between a computer and an external device; when 220V high voltage invades the ends of the bus, heavy current flows through the communication bus, the temperature of devices is raised quickly, the devices can enter a high resistance state quickly, and the current is quickly cut off. The protection device automatically displays an alarm, cuts off a power supply, protects communication equipment, and also has the functions of displaying the alarm in real time and preventing lightening.
Description
Technical field
The present invention relates to a kind of protective device and method, what be specifically related to is that the anti-high pressure of a kind of communication bus is invaded protective device and guard method thereof.
Background technology
Along with the fast development of microprocessor and application widely, digital communications network extends to the industrial process scene becomes possibility, produced with the microprocessor is core, use integrated circuit to replace conventional electrical circuit, the smart machine of functions such as implementation information collection, demonstration, processing, transmission and optimal control.Communicate with one another between the equipment, control, higher requirement is all arranged in precision, operability and reliability, maintainability etc.Thus, caused the generation of fieldbus.
Along with the generation of fieldbus, it is more and more important that the wiring of fieldbus and wiring also seem.Because the communication equipment of each producer and communication products is different, and field connection personnel's carelessness, the problem of on-the-spot wrong communication line is also more and more, thereby causes 220V grade high voltage (AC or the DC that contain 6V-250V) to invade bus, burns communication module even entire equipment.
For example, in the middle of the practice of construction of RS485 route bus, because cabling all is to walk by pipeline, construction party is sometimes in order to scheme conveniently, directly RS485 holding wire and power line are held together, because forceful electric power has strong electromagnetic signal light current is disturbed, thereby causes the RS485 jitter, cause communication unstable.
The RS485 wiring is lack of standardization, is easy to cause signal reflex to cause the bus instability.
The RS485 bus may with 220V grade power line short time or Long contact time.
The RS485 bus must ground connection.In a lot of technical documentations, all mentioning the RS485 bus must ground connection, but does not have how ground connection of detailed proposition.Strictly speaking, the RS485 bus must the single-point reliable ground.Single-point is exactly can only be that a some ground connection is arranged on the whole RS485 bus, can not multipoint earthing, because be because the voltage on the ground wire (generally all being that shielding conductor is made ground wire) will be consistent, prevent common mode disturbances, if multipoint earthing runs counter to desire with its ground connection.The ground wire of whole RS485 circuit must have excellent contact during reliable ground, thereby guarantee the voltage unanimity, because in practice of construction, for easy-to-connect, line is cut into multistage connects again, but shielding conductor is not done good connection, thereby make its ground wire be divided into multistage, voltage can not be consistent, and causes common mode disturbances.
Summary of the invention
The object of the invention provides the anti-high pressure of a kind of communication bus and invades protective device and guard method thereof, can protect communication bus automatic protection when high pressure is invaded, and the safety of protection communication bus after high pressure is invaded end, is recovered the operate as normal of bus automatically; Under the situation that does not have high pressure to invade, communication bus is not disturbed, also have instant playback warning and lightning protection electric work energy.
In order to achieve the above object, technical scheme of the present invention is: the anti-high pressure of a kind of communication bus is invaded protective device, comprise, housing and the protective circuit of being located in the housing, be characterized in, one sidewall of described housing is provided with normal bus two ends, and another sidewall of housing is provided with bus end, earth terminal and the indicator light D1 of anti-high pressure invasion;
Described protective circuit comprises: Display and Alarm Circuit, anti-high pressure are invaded fast tripping protection circuit, lightning prevention circuit;
The two ends of described Display and Alarm Circuit are attempted by the bus two ends of anti-high pressure invasion;
The end 1 of described lightning prevention circuit, end 2 are attempted by the bus two ends of anti-high pressure invasion;
Described anti-high pressure is invaded the fast tripping protection circuit, comprises anti-high pressure intrusion fast tripping protection device R2, R3, Transient Suppression Diode T1, T2; Anti-high pressure is invaded the end 1 of fast tripping protection device R2, the end 1 of R3 is connected with the bus two ends of anti-high pressure invasion respectively; the anode of Transient Suppression Diode T1, T2 is respectively with the two ends of normal bus and cross anti-high pressure and invade the end 2 of fast tripping protection device R2, R3 and connect, and the negative terminal of Transient Suppression Diode T1, T2 is connected.
Above-mentioned communication bus protective device; wherein; described Display and Alarm Circuit is connected in series a current-limiting resistance R1 by the light-emitting diode negative terminal and constitutes, and the anode of this light-emitting diode is connected with the bus end of anti-high pressure invasion, and the other end of current-limiting resistance R1 is connected with the bus end of anti-high pressure invasion.
Above-mentioned communication bus protective device, wherein, described lightning prevention circuit is made of anti-thunder tube, and the end 1 of this anti-thunder tube, end 3 are connected with the bus end that anti-high pressure is invaded respectively.
Above-mentioned communication bus protective device, wherein, the described earth terminal that is arranged on the housing opposite side is connected and composed by end, and the negative terminal of this earth terminal and Transient Suppression Diode T1, T2, the end 2 of anti-thunder tube also connect.
Above-mentioned communication bus protective device, wherein, the indicator light that described housing is provided with is the light-emitting diode D1 in the described protective circuit.
Above-mentioned communication bus protective device, wherein, described anti-high pressure is invaded fast tripping protection device R 2, R3 adopts high molecular polymer positive coefficient temperature and resistance.
Above-mentioned communication bus protective device, wherein, described current-limiting resistance R1 adopts the resistance of high value.
A kind of guard method that is used for the communication bus protective device is characterized in, this method comprises:
Step 1 is in the bus of this communications protection device serial connection between computer and external equipment;
Step 2 is invaded the bus end 121,122 of this device as 220V grade high voltage, and this installs automatic display alarm, cuts off the electricity supply;
Step 3 is invaded when no high voltage, and then circuit working is normal.
Above-mentioned guard method, wherein, further comprising the steps of in described step 1:
Step 1.1, bus end 121,122 and the contiguous bus end that has high pressure to invade the zone that the anti-high pressure on the housing is invaded are connected;
Step 1.2 connects the normal bus end on the housing 111,112 with the bus end that is connected computer;
Step 1.3 is with the earth terminal of earth terminal on the housing 123,124 and bus and connect.
Above-mentioned guard method, wherein, further comprising the steps of in described step 2:
Step 2.1 has high pressure to invade this device 100, and the indicator light D1 that is arranged on the housing shows red light, reports to the police automatically;
Step 2.2, the Transient Suppression Diode T1 in the protective circuit, T2 moment conducting;
Step 2.3, overcurrent protector R2, R3 overcurrent in the protective circuit block;
Step 2.4, when normal operation, the earth impedance of this device is very big, and the impedance that is connected in the circuit is then very little; When thunder and lightning attacked communication bus, this device had been brought into play good voltage clamp effect, and its clamp voltage is lower than the withstand voltage level of bus chip.
Advantage and beneficial effect that the anti-high pressure of communication bus of the present invention is invaded the guard method of protective device and the intrusion of anti-high pressure thereof are:
1. the anti-high pressure of communication bus of the present invention is invaded protective device and can be protected communication equipment automatically owing to be provided with protective circuit, prolongs the life-span of communication chip, and effectively protection communication is unimpeded;
2. the anti-high pressure of communication bus of the present invention is invaded protective device owing to be provided with lightning prevention circuit, can prevent thunder and lightning;
3. the anti-high pressure of communication bus of the present invention is invaded protective device owing to be provided with Display and Alarm Circuit, has the function of timely demonstration red alarm signal.
4. the anti-high pressure of communication bus of the present invention is invaded protective device and is serially connected in the bus of computer and external equipment, adopts guard method of the present invention can effectively prevent the intrusion of 220V high voltage (AC or the DC that contain 6V-250V), thereby protects communication equipment.
Description of drawings
Fig. 1 is the external structure schematic diagram that the anti-high pressure of communication bus of the present invention is invaded protective device;
Fig. 2 is that the anti-high pressure of communication bus of the present invention is invaded the protective circuit schematic diagram in the protective device;
Fig. 3 is that the anti-high pressure of communication bus of the present invention is invaded the application schematic diagram that protective device is serially connected in the multi-channel serial port server;
Fig. 4 is that the anti-high pressure of communication bus of the present invention is invaded the application schematic diagram that protective device is serially connected in single channel equipment.
Embodiment
The communication bus that communication bus protective device CPD of the present invention (Communication Protective Device) occurs at the scene is just invaded by 220V grade high voltage (AC or the DC that contain 6V-250V); for the communication bus that communication devices of users provides is protected; make increasing communication equipment avoid 220V grade high voltage and invade and burnt, reliable display alarm and lightning protection electric work energy are provided simultaneously.
See also shown in Figure 1; the anti-high pressure of a kind of communication bus is invaded protective device; comprise; housing 10 and the protective circuit of being located in the housing 10 20; 11 are provided with normal bus end 111,112 on one sidewall of housing 10, and 12 are provided with bus end 121,122, earth terminal 123,124 and the indicator light D1 that anti-high pressure is invaded on another sidewall of housing 10.
See also shown in Figure 2ly, protective circuit 20 comprises:, lightning prevention circuit 21, Display and Alarm Circuit 22, anti-high pressure invade fast tripping protection circuit 23; The two ends of described Display and Alarm Circuit 21 are attempted by the bus two ends 121,122 of anti-high pressure invasion; Display and Alarm Circuit 21 is connected in series a current-limiting resistance R1 by light-emitting diode D1 negative terminal and constitutes, and current-limiting resistance R1 adopts high resistance measurement.The anode of this light-emitting diode is connected with the bus end 122 of anti-high pressure invasion, and the other end of current-limiting resistance R1 is connected with the bus end 121 of anti-high pressure invasion.The indicator light that another sidewall 10 of housing is provided with is the light-emitting diode D1 in the described protective circuit 20.
The end 1 of described lightning prevention circuit, end 3 are attempted by the bus two ends 121,122 of anti-high pressure invasion; Lightning prevention circuit is made of anti-thunder tube S1, and the end 1 of this anti-thunder tube S1, end 3 are connected with the bus end 121,122 that anti-high pressure is invaded respectively.
Anti-high pressure is invaded fast tripping protection circuit 23 and comprised: anti-high pressure is invaded fast tripping protection device R2, R3, and model is the Transient Suppression Diode T1 of P0300SB, T2; Anti-high pressure is invaded fast tripping protection device R 2, R3 employing model is the high molecular polymer positive coefficient temperature and resistance of WH600-110.Anti-high pressure is invaded the end 1 of fast tripping protection device R2, the end 1 of R3 is connected with the bus two ends 121,122 of anti-high pressure invasion respectively; the anode of Transient Suppression Diode T1, T2 was invaded the end 2 of cut-off protector R2, R3 with the two ends 111,112 of normal bus and anti-high pressure respectively and was connect, and the negative terminal of Transient Suppression Diode T1, T2 is connected.
The earth terminal that is arranged on the housing opposite side 12 is connected and composed by end 123,124, and the negative terminal of this earth terminal and Transient Suppression Diode T1, T2, the end 2 of anti-thunder tube also connect.
The anti-high pressure of communication bus is invaded protective device and can be guaranteed when having 220V grade high voltage to invade between bus, there are the components and parts that big electric current flows through the anti-high pressure intrusion of communication bus protective device to make its temperature fast rise, the components and parts that the anti-high pressure of communication bus is invaded protective device can enter high-impedance state rapidly, and electric current is by rapid pinch off; The quick conducting of over-voltage protector reverse breakdown simultaneously makes electric current pass through over-voltage protector ground connection, and with voltage limit near the over-voltage protector puncture voltage, thereby communication equipment is played a protective role.
Seeing also Fig. 3 is that the anti-high pressure of communication bus of the present invention is invaded the application schematic diagram that protective device is serially connected in the multi-channel serial port server; the anti-high pressure of a plurality of communication buss of the present invention is invaded protective device 100 and is serially connected in respectively in the bus 400 of computer 200 and server 300; apparatus of the present invention 100 are adjoining with high pressure intrusion zone, thereby can effectively protect communication equipment and communication bus 400.
Seeing also Fig. 4 is that the anti-high pressure of communication bus of the present invention is invaded the application schematic diagram that protective device 100 is serially connected in single channel equipment; apparatus of the present invention 100 are serially connected in the bus 400 of individual equipment 500; apparatus of the present invention 100 are adjoining with high pressure intrusion zone, thereby can effectively protect communication equipment and communication bus 400.
Above-mentioned application protection sees following guard method for details.
A kind of guard method that is used for the communication bus protective device comprises:
Step 1 is in the bus of this communications protection device serial connection between computer and external equipment;
Step 1.1, bus end 121,122 and the contiguous bus end that has high pressure to invade the zone that the anti-high pressure on the housing is invaded are connected;
Step 1.2 connects the normal bus end on the housing 111,112 with the bus end that is connected computer;
Step 1.3 is with the earth terminal of earth terminal on the housing 123,124 and bus and connect.
Step 2 is invaded the bus end 121,122 of this device as 220V grade high voltage, and this installs automatic display alarm, cuts off the electricity supply;
Step 2.1 has high pressure to invade this device 100, and the indicator light D1 that is arranged on the housing shows red light, reports to the police automatically;
Step 2.2, the Transient Suppression Diode T1 in the protective circuit, T2 moment conducting;
Step 2.3, overcurrent protector R2, R3 overcurrent in the protective circuit block;
Step 2.4, when normal operation, the earth impedance of this device is very big, and the impedance that is connected in the circuit is then very little; When thunder and lightning attacked communication bus, this device had been brought into play good voltage clamp effect, and its clamp voltage is lower than the withstand voltage level of bus chip.
Step 3 is invaded when no high voltage, and then circuit working is normal.
In sum, the present invention can protect communication equipment automatically, prolong the life-span of communication chip, the anti-high pressure of communication bus is invaded protective device 100 can be when momentary pulse voltage be invaded, play a protective role equally, guarantee that the 220V grade high voltage of frequent moment or long period can't invade communication chip inside; Effectively protection communication is unimpeded, and the present invention has also guaranteed the unimpeded of automatic monitoring and control when having protected equipment, thereby makes user's production and life rulyly to carry out.Has anti-lightning strike antisurge simultaneously, not only can reach anti-lightning strike effect, also reached following requirement: when normal operation, the access of lightning guard can not influence the normal transmission of signal, the earth impedance that the anti-high pressure of communication bus is invaded protective device 100 is very big, and the impedance that is connected in the circuit is then very little; When thunder and lightning attacked communication bus, the anti-high pressure of communication bus was invaded protective device 100 and has been brought into play good voltage clamp effect, and in suppressing thunder and lightning attack process, it is excellent that the anti-high pressure of communication bus is invaded protective device 100 self; Attack has enough fast response speed to thunder and lightning.
At the scene, when being subjected to the intrusion of 220V high pressure on the communication bus, people often can't in time find, cause burning in a large number of communication equipment and watch-dog.And after installation the present invention, not only can effectively protect equipment, and the anti-high pressure of communication bus invades indicator light on the panel of the protective device 100 dazzling redness of can glimmering, and makes on-the-spot commissioning staff or user in time to find and to handle.
Claims (10)
1. the anti-high pressure of communication bus is invaded protective device, comprises housing and is located at the protective circuit that the anti-high pressure in the housing is invaded, and it is characterized in that:
One sidewall of described housing is provided with normal bus end (121,122), and another sidewall of housing is provided with bus end (111,112), earth terminal (123,124) and the indicator light D1 of anti-high pressure invasion;
Described protective circuit comprises: Display and Alarm Circuit, anti-high pressure are invaded fast tripping protection circuit, lightning prevention circuit;
The two ends of described Display and Alarm Circuit are attempted by the bus two ends (121,122) of anti-high pressure invasion;
The end 1 of described lightning prevention circuit, end 2 are attempted by the bus two ends (121,122) of anti-high pressure invasion;
Described anti-high pressure is invaded the fast tripping protection circuit, comprises anti-high pressure intrusion fast tripping protection device R2, R3, Transient Suppression Diode T1, T2; Anti-high pressure is invaded the end 1 of fast tripping protection device R2, the end 1 of R3 is connected with the bus two ends (121,122) of anti-high pressure invasion respectively; the anode of Transient Suppression Diode T1, T2 is invaded the end 2 of fast tripping protection device R2, R3 with the two ends (111,112) of normal bus and anti-high pressure respectively and is connect, and the negative terminal of Transient Suppression Diode T1, T2 is connected.
2. the anti-high pressure of communication bus according to claim 1 is invaded protective device; it is characterized in that: described Display and Alarm Circuit is connected in series a current-limiting resistance R1 by the light-emitting diode negative terminal and constitutes; the anode of this light-emitting diode is connected with the bus end 122 of anti-high pressure invasion, and the other end of current-limiting resistance R1 is connected with the bus end 121 of anti-high pressure invasion.
3. the anti-high pressure of communication bus according to claim 1 is invaded protective device, it is characterized in that; Described lightning prevention circuit is made of anti-thunder tube, and the end 1 of this anti-thunder tube, end 3 are connected with the bus end 121,122 that anti-high pressure is invaded respectively.
4. the anti-high pressure of communication bus according to claim 1 is invaded protective device; it is characterized in that: the described earth terminal that is arranged on the housing opposite side is connected and composed by end 123,124, and the negative terminal of this earth terminal and Transient Suppression Diode T1, T2, the end 2 of anti-thunder tube also connect.
5. the anti-high pressure of communication bus according to claim 1 is invaded protective device, and it is characterized in that: the indicator light that described housing is provided with is the light-emitting diode D1 in the described protective circuit.
6. the anti-high pressure of communication bus according to claim 1 is invaded protective device, it is characterized in that: described anti-high pressure is invaded fast tripping protection device R 2, R3 adopts high molecular polymer positive coefficient temperature and resistance.
7. the anti-high pressure of communication bus according to claim 1 is invaded protective device, it is characterized in that described current-limiting resistance R1 adopts the resistance of high value.
8. one kind is used for the guard method that the anti-high pressure of communication bus is invaded protective device, and it is characterized in that: this method comprises:
Step 1 is invaded protective device with the anti-high pressure of this communication bus and is serially connected in the bus between computer and the external equipment;
Step 2 is invaded the bus end 121,122 of this device as 220V grade high voltage, and this installs automatic display alarm, cuts off the electricity supply;
Step 3 is invaded when no high voltage, and then circuit working is normal.
9. guard method according to claim 8 is characterized in that, and is further comprising the steps of in described step 1:
Step 1.1, bus end 121,122 and the contiguous bus end that has high pressure to invade the zone that the anti-high pressure on the housing is invaded are connected;
Step 1.2 connects the normal bus end on the housing 111,112 with the bus end that is connected computer;
Step 1.3 is with the earth terminal of earth terminal on the housing 123,124 and bus and connect.
10. guard method according to claim 8 is characterized in that, and is further comprising the steps of in described step 2:
Step 2.1 has high pressure to invade this device 100, and the indicator light D1 that is arranged on the housing shows red light, reports to the police automatically;
Step 2.2, the Transient Suppression Diode T1 in the protective circuit, T2 moment conducting;
Step 2.3, the anti-high pressure in the protective circuit is invaded overcurrent protector R2, the R3 overcurrent blocks;
Step 2.4, when normal operation, the earth impedance of this device is very big, and the impedance that is connected in the circuit is then very little; When thunder and lightning attacked communication bus, this device had been brought into play good voltage clamp effect, and its clamp voltage is lower than the withstand voltage level of bus chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910045438A CN101783495A (en) | 2009-01-16 | 2009-01-16 | Protection device and protection method for preventing high voltage from invading communication bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910045438A CN101783495A (en) | 2009-01-16 | 2009-01-16 | Protection device and protection method for preventing high voltage from invading communication bus |
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| Publication Number | Publication Date |
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| CN101783495A true CN101783495A (en) | 2010-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910045438A Pending CN101783495A (en) | 2009-01-16 | 2009-01-16 | Protection device and protection method for preventing high voltage from invading communication bus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151767A (en) * | 2013-02-16 | 2013-06-12 | 中讯邮电咨询设计院有限公司 | Method for connecting transient equipotential of grounding grid in case of dangerous influence to small-sized communication station caused by strong currents |
| CN103151768A (en) * | 2013-02-16 | 2013-06-12 | 中讯邮电咨询设计院有限公司 | Method for decoupling grounding grid distance of communication bureau station in case of dangerous influence to communication bureau station caused by strong currents |
-
2009
- 2009-01-16 CN CN200910045438A patent/CN101783495A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151767A (en) * | 2013-02-16 | 2013-06-12 | 中讯邮电咨询设计院有限公司 | Method for connecting transient equipotential of grounding grid in case of dangerous influence to small-sized communication station caused by strong currents |
| CN103151768A (en) * | 2013-02-16 | 2013-06-12 | 中讯邮电咨询设计院有限公司 | Method for decoupling grounding grid distance of communication bureau station in case of dangerous influence to communication bureau station caused by strong currents |
| CN103151767B (en) * | 2013-02-16 | 2015-07-01 | 中讯邮电咨询设计院有限公司 | Method for connecting transient equipotential of grounding grid in case of dangerous influence to small-sized communication station caused by strong currents |
| CN103151768B (en) * | 2013-02-16 | 2015-07-01 | 中讯邮电咨询设计院有限公司 | Method for decoupling grounding grid distance of communication bureau station in case of dangerous influence to communication bureau station caused by strong currents |
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Application publication date: 20100721 |