CN208849450U - A kind of 485 siganl thunder-proof devices - Google Patents
A kind of 485 siganl thunder-proof devices Download PDFInfo
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- CN208849450U CN208849450U CN201821845668.6U CN201821845668U CN208849450U CN 208849450 U CN208849450 U CN 208849450U CN 201821845668 U CN201821845668 U CN 201821845668U CN 208849450 U CN208849450 U CN 208849450U
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- protection circuit
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Abstract
The utility model discloses a kind of 485 siganl thunder-proof devices, are disposed with first order protection circuit, second level protection circuit and third level protection circuit from entrance to outlet；The first order protection circuit is high current leadage circuit, and second level protection circuit is current-limiting circuit, and third level protection circuit is over-voltage and over-current suppression circuit；The input terminal of the first order protection circuit is connected to external 485 signal inlet wires; output end is then connected to the input terminal of the second level protection circuit; the output end of the second level protection circuit is connected to the input terminal of the third level protection circuit, and the output end of the third level protection circuit is connected to protected equipment.The utility model is using the three-level protection circuit structure that high current is released, current limliting, over-voltage and over-current inhibit is set gradually, and conformability is good, and safety is higher.
Description
Technical field
The utility model relates to lightning protection device technical fields, and in particular to a kind of 485 siganl thunder-proof devices.
Background technique
Lightning protection device is also known as Surge Protector (SPD, Surge Protective Devices), is mounted in device port use
In the equipment protected for various lightning currents, switching overvoltage etc..485 communications protocol are widely used in process automation
The industrial environments such as (chemical industry, brewing), production automation (automobile manufacture, intermetallic composite coating), power transmission (instrument communication), therefore
Stablizing for 485 communications is most important, if scurrying into equipment by 485 signal wires by external over-voltage or overcurrent, equipment is caused to be damaged
It is bad, production loss, it is therefore necessary to 485 siganl thunder-proof devices are sealed on 485 connections.
Current most of siganl thunder-proof devices use the structure of two-stage protection circuit, and first order circuit protects over-voltage and over-current big,
Second level circuit protects over-voltage and over-current low, but a secondary circuit conformability is poor, and primary circuit response speed is lower than secondary circuit, prevents
Shield rank is low, protection level is poor.
Utility model content
In view of the deficiencies of the prior art, the utility model is intended to provide a kind of 485 siganl thunder-proof devices, has three-level protective electricity
Road, safety are higher.
To achieve the goals above, the utility model adopts the following technical solution:
A kind of 485 siganl thunder-proof devices, are disposed with first order protection circuit, second level protection circuit from entrance to outlet
With third level protection circuit；The first order protection circuit is high current leadage circuit, and second level protection circuit is current-limiting circuit,
Third level protection circuit is over-voltage and over-current suppression circuit；The input terminal of the first order protection circuit is connected to external 485 signals
Inlet wire, output end are then connected to the input terminal of the second level protection circuit, the output end connection of the second level protection circuit
Protected equipment is connected in the output end of the input terminal of the third level protection circuit, the third level protection circuit.
Further, the first order protection circuit includes gas-discharge tube.
Further, the second level protection circuit includes fuse and thermistor, and the thermistor is connected to institute
Fuse is stated, the input terminal of the thermistor is connected to the first order protection circuit, the output end connection of the fuse
In the third level protection circuit.
Further, the third level protection circuit includes Transient Suppression Diode and varistor, and the transient state inhibits
Diode is connected with the varistor, and the input terminal of the varistor is connected to the second level protection circuit, the wink
State inhibits the output end of diode to be connected to the protected equipment.
The utility model has the beneficial effects that: 485 siganl thunder-proof device provided by the utility model is big using setting gradually
The three-level protection circuit structure that electric current is released, current limliting, over-voltage and over-current inhibit, conformability is good, and safety is higher.
Detailed description of the invention
Fig. 1 is the electrical block diagram in the utility model embodiment.
Specific embodiment
Below with reference to attached drawing, the utility model will be further described, it should be noted that the present embodiment is with this skill
Premised on art scheme, the detailed implementation method and specific operation process are given, but the protection scope of the utility model is not
It is limited to the present embodiment.
As shown in Figure 1, a kind of 485 siganl thunder-proof devices, are disposed with first order protection circuit, second from entrance to outlet
Grade protection circuit and third level protection circuit；The first order protection circuit is high current leadage circuit, second level protection circuit
For current-limiting circuit, third level protection circuit is over-voltage and over-current suppression circuit；The input terminal of the first order protection circuit is connected to
External 485 signal inlet wires, output end are then connected to the input terminal of the second level protection circuit, the second level protection circuit
Output end is connected to the input terminal of the third level protection circuit, and the output end of the third level protection circuit, which is connected to, to be protected
Equipment.
Further, the first order protection circuit includes gas-discharge tube.
Further, the second level protection circuit includes fuse and thermistor, and the thermistor is connected to institute
Fuse is stated, the input terminal of the thermistor is connected to the first order protection circuit, the output end connection of the fuse
In the third level protection circuit.
Further, the third level protection circuit includes Transient Suppression Diode and varistor, and the transient state inhibits
Diode is connected with the varistor, and the input terminal of the varistor is connected to the second level protection circuit, the wink
State inhibits the output end of diode to be connected to the protected equipment.
When work, first order protection circuit acts first, first inhibits the big energy such as thunder and lightning, and high current of releasing inhibits high electricity
Pressure.Second level protection circuit limits residual current, and guarantees that first order protection circuit is dynamic prior to third level protection circuit
Make.Last third level protection circuit carries out over-voltage and over-current inhibition to last remaining electric current, and will be more than that the electric current limited is released
Enter the earth, to guarantee that 485 communication lines work normally.
485 siganl thunder-proof devices in the present embodiment using successively using set gradually high current release, current limliting, over-voltage and over-current
The three-level protection circuit structure of inhibition, conformability is good, and safety is higher.
Specifically, in the present embodiment, first order protection circuit is released by gas-discharge tube progress high current, through excessive
After electric current is released, residual current enters second level protection circuit, and the size for electric current of surging first is limited by thermistor, plays wink
Between current limliting effect, fuse is then used to carry out overload protection.Last 485 signal enters in third level protection circuit, once
Network voltage increases, and varistor meeting moment puncture short is absorbed and released to over-voltage energy, to effectively prevent
Voltage enters protected line, and Transient Suppression Diode is then further absorbed and let out to the residual amount of energy of varistor
It puts, preferably protects protected equipment.
For those skilled in the art, it can be provided various corresponding according to above technical solution and design
Change and modification, and all these change and modification, should be construed as being included in the utility model claims protection scope it
It is interior.
Claims (4)
1. a kind of 485 siganl thunder-proof devices, which is characterized in that be disposed with first order protection circuit, second from entrance to outlet
Grade protection circuit and third level protection circuit；The first order protection circuit is high current leadage circuit, second level protection circuit
For current-limiting circuit, third level protection circuit is over-voltage and over-current suppression circuit；The input terminal of the first order protection circuit is connected to
External 485 signal inlet wires, output end are then connected to the input terminal of the second level protection circuit, the second level protection circuit
Output end is connected to the input terminal of the third level protection circuit, and the output end of the third level protection circuit, which is connected to, to be protected
Equipment.
2. 485 siganl thunder-proof device according to claim 1, which is characterized in that the first order protection circuit includes gas
Discharge tube.
3. 485 siganl thunder-proof device according to claim 1, which is characterized in that the second level protection circuit includes insurance
Silk and thermistor, the thermistor are connected to the fuse, and the input terminal of the thermistor is connected to described first
Grade protection circuit, the output end of the fuse are connected to the third level protection circuit.
4. 485 siganl thunder-proof device according to claim 1, which is characterized in that the third level protection circuit includes transient state
Diode and varistor, the Transient Suppression Diode is inhibited to connect with the varistor, the input of the varistor
End is connected to the second level protection circuit, and the output end of the Transient Suppression Diode is connected to the protected equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821845668.6U CN208849450U (en) | 2018-11-09 | 2018-11-09 | A kind of 485 siganl thunder-proof devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821845668.6U CN208849450U (en) | 2018-11-09 | 2018-11-09 | A kind of 485 siganl thunder-proof devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208849450U true CN208849450U (en) | 2019-05-10 |
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ID=66376846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821845668.6U Active CN208849450U (en) | 2018-11-09 | 2018-11-09 | A kind of 485 siganl thunder-proof devices |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208849450U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111404131A (en) * | 2020-04-09 | 2020-07-10 | 贵州航天天马机电科技有限公司 | Protection circuit for preventing lightning strike |
| WO2023134760A1 (en) * | 2022-01-17 | 2023-07-20 | 世格流体控制（上海）有限公司 | Overcurrent protection apparatus, and explosion-proof solenoid valve on which overcurrent protection apparatus is integrated |
-
2018
- 2018-11-09 CN CN201821845668.6U patent/CN208849450U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111404131A (en) * | 2020-04-09 | 2020-07-10 | 贵州航天天马机电科技有限公司 | Protection circuit for preventing lightning strike |
| WO2023134760A1 (en) * | 2022-01-17 | 2023-07-20 | 世格流体控制（上海）有限公司 | Overcurrent protection apparatus, and explosion-proof solenoid valve on which overcurrent protection apparatus is integrated |
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