CN204967260U - Industrial field bus electromagnetic interference protector - Google Patents
Industrial field bus electromagnetic interference protector Download PDFInfo
- Publication number
- CN204967260U CN204967260U CN201520752784.3U CN201520752784U CN204967260U CN 204967260 U CN204967260 U CN 204967260U CN 201520752784 U CN201520752784 U CN 201520752784U CN 204967260 U CN204967260 U CN 204967260U
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- bus
- circuit board
- printed circuit
- industrial field
- pcb
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Abstract
The utility model provides an industrial field bus electromagnetic interference protector, including the metal casing of installation and shielding usefulness, install on -the -spot side joint line plug and the bus side joint line plug be connected at the inside printed circuit board of metal casing, with printed circuit board, the bus between on -the -spot side joint line plug and shielding communication cable is connected in the last printing of printed circuit board, reach the surge suppressor who connects gradually with the bus, the interference current inhibitor, interference voltage inhibitor and passive filter, when the on -the -spot side of bus receives electromagnetic interference, pass through surge suppressor, the interference current inhibitor, the interference voltage inhibitor, passive filter's combined action, make the communication signals of the equipment that finally reachs the bus side not influenced, and when protection industrial field bus equipment is not damaged by electromagnetic interference, can guarantee also that bus communication is not breaked, thereby the robustness and the production efficiency of industrial field bus have been improved.
Description
Technical field
The utility model relates to the device that safeguard industries fieldbus exempts from electromagnetic interference, particularly relates to a kind of industrial field bus emi protection device.
Background technology
At present; known industrial field bus protector is the interference protection for surge; function is that protection bus apparatus can not damage when surge occurs; but; the normal communication of bus when this protector cannot ensure that surge interference occurs; and the electromagnetic interference of other types cannot be eliminated, such as Clusters and conduction interference, thus cause communicating interrupt.And the recovery of communication can only rely on pro-active intervention or shutdown to restart, its recovery time is longer, thus causes the decline of production efficiency.
Summary of the invention
Be necessary to propose a kind of industrial field bus emi protection device that effectively can suppress electromagnetic interference.
A kind of industrial field bus emi protection device, comprise the metal shell installed and shield, be arranged on the printed circuit board (PCB) of metal shell inside, the on-the-spot side connection plug be connected with printed circuit board (PCB) and bus side connection plug, be connected by shielding communication cable between described printed circuit board (PCB) with bus side connection plug, described printed circuit board (PCB) is used to print the bus connected between on-the-spot side connection plug and shielding communication cable, and the surge suppressor to be connected successively with bus, disturbance current inhibitor, interference voltage inhibitor and passive filter, described bus comprises bus anode, bus negative terminal, bus reference edge.
Preferably, described surge suppressor comprises two gas discharge tubes, be respectively the first gas discharge tube and the second gas discharge tube, described first gas discharge tube is connected in parallel on bus anode, between bus negative terminal and the earth terminal of printed circuit board (PCB), described second gas discharge tube is connected in parallel between bus reference edge and the earth terminal of printed circuit board (PCB), and the earth terminal of described printed circuit board (PCB) is by described metal shell ground connection.
Preferably, described disturbance current inhibitor comprise two moment blocking units, be respectively first moment blocking unit and second moment blocking unit, described first moment blocking unit connect with bus anode, described second instantaneously blocking unit connect with bus negative terminal.
Preferably, described interference voltage inhibitor comprises two Transient Voltage Suppressors, be respectively the first Transient Voltage Suppressor and the second Transient Voltage Suppressor, described first Transient Voltage Suppressor be connected in parallel on bus anode and and bus reference edge between, described second Transient Voltage Suppressor is connected in parallel between bus negative terminal and bus reference edge.
Preferably, described passive filter comprises two ceramic condensers, be respectively the first ceramic condenser and the second ceramic condenser, described first ceramic condenser is connected in parallel between bus anode and bus reference edge, and the second ceramic condenser is connected in parallel between bus negative terminal and bus reference edge.
When the on-the-spot side of bus is subject to electromagnetic interference; by the acting in conjunction of surge suppressor, disturbance current inhibitor, interference voltage inhibitor, passive filter; make the communication signal of the equipment finally arriving bus side unaffected; and while safeguard industries field bus device is not damaged by electromagnetic interference; also can ensure that bus communication is not interrupted, thus improve robustness and the production efficiency of industrial field bus.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of industrial field bus emi protection device.
Fig. 2 is the circuit diagram of industrial field bus emi protection device.
Fig. 3 is the structural representation of the embodiment of industrial field bus emi protection device.
Fig. 4 is the structural representation of described shielding communication cable.
In figure: metal shell 10, printed circuit board (PCB) 20, bus anode 201, bus negative terminal 202, bus reference edge 203, surge suppressor 204, gas discharge tube 2041, disturbance current inhibitor 205, blocking unit 2051 instantaneously, interference voltage inhibitor 206, Transient Voltage Suppressor 2061, passive filter 207, ceramic condenser 2071, on-the-spot side connection plug 30, bus side connection plug 40, shielding communication cable 50, conductor 501, insulating barrier 502, filler 503, ground wire 504, polyester belt 505, aluminium foil 506, braid 507, serving 508.
Embodiment
See Fig. 1 and Fig. 4, industrial field bus emi protection device may be used for CAN and Profibus, the serial data bus such as RS485, comprise the metal shell 10 installed and shield, be arranged on the printed circuit board (PCB) 20 of metal shell 10 inside, the on-the-spot side connection plug 30 be connected with printed circuit board (PCB) 20 and bus side connection plug 40, be connected by shielding communication cable 50 between printed circuit board (PCB) 20 with bus side connection plug 40, printed circuit board (PCB) 20 is printed the bus be connected between on-the-spot side connection plug 30 and shielding communication cable 50, and the surge suppressor 204 to be connected successively with bus, disturbance current inhibitor 205, interference voltage inhibitor 206 and passive filter 207, bus comprises bus anode 201, bus negative terminal 202, bus reference edge 203.
Wherein, shielding communication cable 50 comprises two conductors 501, filler 503, ground wire 504, outer cladding layer, two conductors 501 wrap insulate layer 502 respectively, insulating barrier 502 and the ground wire 504 of filler 503 and two conductors are together wrapped up by outer cladding layer, and outer cladding layer is followed successively by polyester belt 505, aluminium foil 506, braid 507, serving 508 from inside to outside.Bus anode 201 and bus negative terminal 202 are welded to connect with two conductors 501 respectively, bus reference edge 203 and ground wire 504 are welded to connect, outer cladding layer and printed circuit board (PCB) 20 and the metal shell 10 of shielding communication cable 50 fully overlap, thus avoid outside two conductors 501 or ground wire 504 be exposed to.Use shielding communication cable 50 that bus signals is led to bus side connection plug 40, make Signal transmissions more stable.
See Fig. 2, surge suppressor 204 comprises two gas discharge tubes 2041, be respectively the first gas discharge tube and the second gas discharge tube, first gas discharge tube is connected in parallel between bus anode 201 and bus negative terminal 202, its centre cap ground connection, second gas discharge tube is connected in parallel between the earth terminal of bus reference edge 203 and printed circuit board (PCB) 20, and the earth terminal of printed circuit board (PCB) 20 is by metal shell 10 ground connection.First gas discharge tube and the second gas discharge tube select the gas discharge tube that can tolerate 8/20us250A and impact, and can suppress the high-energy of surge, work release Lightning Transient overcurrent and over-voltage effect.Such as bus is because when extraneous interference produces suddenly peak current or voltage, and gas discharge tube 2041 can be shunted within the extremely short time in conducting, thus avoids surge to the infringement of other equipment in loop.
Further, disturbance current inhibitor 205 comprises two blocking units 2051 instantaneously, be respectively first moment blocking unit and second moment blocking unit, first moment blocking unit connect with bus anode 201, second moment blocking unit connect with bus negative terminal 202, two moment blocking unit 2051 can suppress to remain big current, consider the running current of bus, two moment blocking unit 2051 select operating current in the model of 300mA.Blocking unit 2051 stops a glitch by the mechanism cutting off electric current instantaneously; instead of shift or shunt surge to ground; as a kind of high speed surge protective device; he can prevent short circuit; AC power intersection, induction and lightning surge; and moment blocking unit 2051 all can restore funcitons completely after the multiple error event of process, guarantee bus communication is not interrupted, thus improves robustness and the production efficiency of industrial field bus.
Further, interference voltage inhibitor 206 comprises two Transient Voltage Suppressors 2061, be respectively the first Transient Voltage Suppressor and the second Transient Voltage Suppressor, first Transient Voltage Suppressor be connected in parallel on bus anode 201 and and bus reference edge 203 between, the second Transient Voltage Suppressor is connected in parallel between bus negative terminal 202 and bus reference edge 203.Transient Voltage Suppressor 2061 can suppress residual voltage, power can be selected to be 1500W and operation voltage higher than the model of bus operating voltage.
Further, passive filter 207 comprises two ceramic condensers 2071, be respectively the first ceramic condenser and the second ceramic condenser, the first ceramic condenser is connected in parallel between bus anode 201 and bus reference edge 203, and the second ceramic condenser is connected in parallel between bus negative terminal 202 and bus reference edge 203.Ceramic condenser 2071 can eliminate high frequency noise, the final communication signal arriving the equipment of bus side of purification, thus ensures bus communication not by the harassing and wrecking of electromagnetic interference, keeps normally working, should select the withstand voltage model higher than Transient Voltage Suppressor clamp voltage.
Embodiment:
See Fig. 3, such as: on-the-spot side apparatus selects frequency converter, bus side equipment choosing PLC, noise filtering absorption process from on-the-spot side to bus side is as follows successively: when on-the-spot side cable is subject to electromagnetic interference, first high energy part is sponged by gas discharge tube 2041, then remaining big current is sponged by transient state blocking unit 2051, then the residual voltage higher than bus safety withstand voltage is sponged by Transient Voltage Suppressor 2061, high frequency noise is eliminated finally by ceramic condenser 2071, the final communication signal arriving bus side equipment of purification, thus ensure bus communication not by the harassing and wrecking of electromagnetic interference, keep normal work.
Claims (5)
1. an industrial field bus emi protection device, it is characterized in that: comprise the metal shell installed and shield, be arranged on the printed circuit board (PCB) of metal shell inside, the on-the-spot side connection plug be connected with printed circuit board (PCB) and bus side connection plug, be connected by shielding communication cable between described printed circuit board (PCB) with bus side connection plug, described printed circuit board (PCB) is used to print the bus connected between on-the-spot side connection plug and shielding communication cable, and the surge suppressor to be connected successively with bus, disturbance current inhibitor, interference voltage inhibitor and passive filter, described bus comprises bus anode, bus negative terminal, bus reference edge.
2. industrial field bus emi protection device as claimed in claim 1; it is characterized in that: described surge suppressor comprises two gas discharge tubes; be respectively the first gas discharge tube and the second gas discharge tube; described first gas discharge tube is connected in parallel on bus anode, between bus negative terminal and the earth terminal of printed circuit board (PCB); described second gas discharge tube is connected in parallel between bus reference edge and the earth terminal of printed circuit board (PCB), and the earth terminal of described printed circuit board (PCB) is by described metal shell ground connection.
3. industrial field bus emi protection device as claimed in claim 1; it is characterized in that: described disturbance current inhibitor comprises two blocking units instantaneously; be respectively first moment blocking unit and second moment blocking unit; described first moment blocking unit connect with bus anode, described second instantaneously blocking unit connect with bus negative terminal.
4. industrial field bus emi protection device as claimed in claim 1; it is characterized in that: described interference voltage inhibitor comprises two Transient Voltage Suppressors; be respectively the first Transient Voltage Suppressor and the second Transient Voltage Suppressor; described first Transient Voltage Suppressor be connected in parallel on bus anode and and bus reference edge between, described second Transient Voltage Suppressor is connected in parallel between bus negative terminal and bus reference edge.
5. industrial field bus emi protection device as claimed in claim 1; it is characterized in that: described passive filter comprises two ceramic condensers; be respectively the first ceramic condenser and the second ceramic condenser; described first ceramic condenser is connected in parallel between bus anode and bus reference edge, and the second ceramic condenser is connected in parallel between bus negative terminal and bus reference edge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520752784.3U CN204967260U (en) | 2015-09-28 | 2015-09-28 | Industrial field bus electromagnetic interference protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520752784.3U CN204967260U (en) | 2015-09-28 | 2015-09-28 | Industrial field bus electromagnetic interference protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204967260U true CN204967260U (en) | 2016-01-13 |
Family
ID=55062301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520752784.3U Expired - Fee Related CN204967260U (en) | 2015-09-28 | 2015-09-28 | Industrial field bus electromagnetic interference protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204967260U (en) |
-
2015
- 2015-09-28 CN CN201520752784.3U patent/CN204967260U/en not_active Expired - Fee Related
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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: 20160113 Termination date: 20180928 |