CN209488171U - A kind of 485 communication bus lightning protection circuits for mqtt gateway - Google Patents
A kind of 485 communication bus lightning protection circuits for mqtt gateway Download PDFInfo
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- CN209488171U CN209488171U CN201920112753.XU CN201920112753U CN209488171U CN 209488171 U CN209488171 U CN 209488171U CN 201920112753 U CN201920112753 U CN 201920112753U CN 209488171 U CN209488171 U CN 209488171U
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Abstract
The utility model relates to a kind of 485 communication bus lightning protection circuits for mqtt gateway, comprising: bleeder circuit is used for voltage, protects circuit；Safety protective circuit for protecting circuit, and carries out transfer function；Composite symmetrical circuit, for increasing the protection of circuit；Bleeder circuit is used for protective grounding, and carries out aerial drainage function；The input terminal connection of output end and safety protective circuit of bleeder circuit and the input terminal of composite symmetrical circuit connect；The output end of safety protective circuit and the input terminal of bleeder circuit connect；The output end of composite symmetrical circuit and the input terminal of bleeder circuit connect.This lightning protection circuit uses two-stage composite symmetrical circuit, and common mode, differential mode full guard, residual voltage is low; firewire L, zero curve N can at will connect, and by the protection of ceramic gas discharge tube, thunder and lightning is imported the earth; it realizes good lightning protection effect, confirms whole safety, protect electrical equipment.
Description
Technical field
The utility model relates to electronic technology field more particularly to a kind of lightning protection circuits.
Background technique
With electronics, the development of mechanics of communication, electronic product in life using more and more, have become our and give birth to
Indispensable a part in work.The integrated level of existing electronic product, chip is higher and higher, and circuit design density is increasingly
Greatly, how under the conditions of harsh thunder and lightning to make electronic product steady operation, become a problem to be solved.Therefore, city
It is badly in need of a kind of lightning protection circuit of realization lightning protection effect for mqtt gateway on field.
Summary of the invention
Shortcoming present in view of the above technology, the application provide a kind of lightning protection circuit, can be used in mqtt gateway
Realize lightning protection effect.
To achieve the above object, the application provides a kind of 485 communication bus lightning protection circuits for mqtt gateway, comprising:
Bleeder circuit, safety protective circuit, composite symmetrical circuit, bleeder circuit；
The input terminal connection of output end and safety protective circuit of bleeder circuit and the input terminal of composite symmetrical circuit connect
It connects；The output end of safety protective circuit and the input terminal of bleeder circuit connect；The output end and bleeder circuit of composite symmetrical circuit
Input terminal connection；
Bleeder circuit includes: capacitor C1, varistor PT1, the first temperature protection pipe, resistance R1, resistance R2, inductance L1；
The one end capacitor C1 is connect with firewire import and one end of varistor PT1, the other end ground connection of capacitor C1, pressure
One end of one end connection capacitor C1 of quick resistance PT1 and resistance R2, the other end of one end of resistance R1, varistor PT1 connect
One end of the first temperature protection pipe is connect, the other end of the first temperature protection pipe connects safety protective circuit, the other end of resistance R2
Connect safety protective circuit, one end of the other end connection inductance L1 of resistance R1, the other end connection composite symmetrical electricity of inductance L1
Road is used for voltage, protects circuit.
Further, safety protective circuit includes: capacitor C3, varistor PT3, varistor PT4, third temperature protection
Pipe, the 4th temperature protection pipe, resistance R4, inductance L2；
One end of capacitor C3 is connect with zero curve import and one end of varistor PT3, one end of resistance R4, capacitor C3
Other end ground connection, one end of the other end connection inductance L2 of resistance R4, the other end of inductance L2 connects composite symmetrical circuit；
The other end of varistor PT3 connects third temperature protection pipe, and the other end of third temperature protection pipe connects the 4th temperature protection
One end of pipe and bleeder circuit, one end of the other end connection varistor PT4 of the 4th temperature protection pipe, varistor PT4
The other end connect bleeder circuit.
Further, composite symmetrical circuit includes: varistor PT2, varistor PT5, varistor PT6, the second temperature
Spend protection pipe, the 5th temperature protection pipe, the 6th temperature protection pipe, capacitor C2, capacitor C4, zener diode TVS1, two pole of pressure stabilizing
Pipe TVS2；
One end connection bleeder circuit of varistor PT2 and one end of resistance R3, one end of capacitor C2, two pole of pressure stabilizing
One end of pipe TVS1, and firewire outlet is connected, one end of the other end connection second temperature protection pipe of varistor PT2, second
One end of the other end connection varistor PT5 of temperature protection pipe and safety protective circuit, one end of capacitor C4, pressure stabilizing two
One end of pole pipe TVS2, the other end of varistor PT5 connect the 5th temperature protection pipe, and the other end of the 5th temperature protection pipe connects
One end of bleeder circuit and the 6th temperature protection pipe is connect, the other end of the 6th temperature protection pipe connects the one of varistor PT5
End, the other end of the other end connection resistance R3 of varistor PT5, capacitor C2 other end ground connection, zener diode TVS1's is another
One end ground connection, the other end ground connection of capacitor C4, the other end ground connection of zener diode.
Further, discharge current includes: the 6th ceramic gas discharge tube, the 7th ceramic gas discharge tube；
One end of 6th ceramic gas discharge tube connects one end and the protective grounding of the 7th ceramic gas discharge tube, the
The other end of six ceramic gas discharge tubes connects composite symmetrical circuit, and the other end connection safety of the 7th ceramic gas discharge tube is protected
Protection circuit.
The beneficial effects of the utility model are: using two-stage composite symmetrical circuit, common mode, differential mode all risk insurance in the utility model
Shield, residual voltage is low, and firewire L, zero curve N interface can arbitrarily connect, and can be detached from circuit after varistor short-circuit failure, will not generally draw
Fire is played, temperature safety tube and varistor have good thermal coupling, and voltage instantaneous breakdown varistor can be prevented on fire, led to
Cross the filter function of capacitor, the protection of zener diode, the partial pressure of resistance protects late-class circuit, passes through ceramic gas discharge tube
Protection, thunder and lightning is imported into the earth, good lightning protection effect is realized, confirms whole safety, protects electrical equipment.
Detailed description of the invention
Fig. 1 is this circuit diagram for 485 communication bus lightning protection circuits of mqtt gateway.
Specific embodiment
It is specific embodiment of the utility model and in conjunction with attached drawing below, the technical solution of the utility model is made further
Description, but the utility model is not limited to these examples.
A kind of 485 communication bus lightning protection circuits for mqtt gateway are present embodiments provided, as shown in Figure 1, this lightning protection
Circuit includes: bleeder circuit, is used for voltage, protects circuit；
Safety protective circuit for protecting circuit, and carries out transfer function；
Composite symmetrical circuit, for increasing the protection of circuit；
Bleeder circuit is used for protective grounding, and carries out aerial drainage function；
The input terminal connection of output end and safety protective circuit of bleeder circuit and the input terminal of composite symmetrical circuit connect
It connects；The output end of safety protective circuit and the input terminal of bleeder circuit connect；The output end and bleeder circuit of composite symmetrical circuit
Input terminal connection.
Preferably, bleeder circuit includes: capacitor C1, varistor PT1, the first temperature protection pipe, resistance R1, resistance R2,
Inductance L1；
The one end capacitor C1 is connect with firewire import and one end of varistor PT1, the other end ground connection of capacitor C1, pressure
One end of one end connection capacitor C1 of quick resistance PT1 and resistance R2, the other end of one end of resistance R1, varistor PT1 connect
One end of the first temperature protection pipe is connect, the other end of the first temperature protection pipe connects safety protective circuit, the other end of resistance R2
Connect safety protective circuit, one end of the other end connection inductance L1 of resistance R1, the other end connection composite symmetrical electricity of inductance L1
Road.
Preferably, safety protective circuit includes: capacitor C3, varistor PT3, varistor PT4, third temperature protection
Pipe, the 4th temperature protection pipe, resistance R4, inductance L2；
One end of capacitor C3 is connect with zero curve import and one end of varistor PT3, one end of resistance R4, capacitor C3
Other end ground connection, one end of the other end connection inductance L2 of resistance R4, the other end of inductance L2 connects composite symmetrical circuit；
The other end of varistor PT3 connects third temperature protection pipe, and the other end of third temperature protection pipe connects the 4th temperature protection
One end of pipe and bleeder circuit, one end of the other end connection varistor PT4 of the 4th temperature protection pipe, varistor PT4
The other end connect bleeder circuit.
Preferably, composite symmetrical circuit includes: varistor PT2, varistor PT5, varistor PT6, second temperature
Protection pipe, the 5th temperature protection pipe, the 6th temperature protection pipe, capacitor C2, capacitor C4, zener diode TVS1, zener diode
TVS2；
One end connection bleeder circuit of varistor PT2 and one end of resistance R3, one end of capacitor C2, two pole of pressure stabilizing
One end of pipe TVS1, and firewire outlet is connected, one end of the other end connection second temperature protection pipe of varistor PT2, second
One end of the other end connection varistor PT5 of temperature protection pipe and safety protective circuit, one end of capacitor C4, pressure stabilizing two
One end of pole pipe TVS2, the other end of varistor PT5 connect the 5th temperature protection pipe, and the other end of the 5th temperature protection pipe connects
One end of bleeder circuit and the 6th temperature protection pipe is connect, the other end of the 6th temperature protection pipe connects the one of varistor PT5
End, the other end of the other end connection resistance R3 of varistor PT5, capacitor C2 other end ground connection, zener diode TVS1's is another
One end ground connection, the other end ground connection of capacitor C4, the other end ground connection of zener diode.
Preferably, discharge current includes: the 6th ceramic gas discharge tube, the 7th ceramic gas discharge tube；
One end of 6th ceramic gas discharge tube connects one end and the protective grounding of the 7th ceramic gas discharge tube, the
The other end of six ceramic gas discharge tubes connects composite symmetrical circuit, and the other end connection safety of the 7th ceramic gas discharge tube is protected
Protection circuit.
Its specific working principle are as follows: lightning protection is realized by the branch being connected between zero curve N and firewire L；
When no thunder and lightning enters, branch is in high-impedance state, and when there is thunder and lightning to enter, thunder and lightning runs through partial pressure electricity
Road, safety protective circuit, the tie point conducting electric discharge tube discharge between the varistor in composite symmetrical circuit, and it is electric by aerial drainage
Ceramic gas discharge tube in road imports thunder and lightning in the earth, realizes good lightning protection effect, protects electrical equipment；
Inductance and varistor in bleeder circuit and safety protective circuit, so that firewire and ground wire and zero curve and ground wire
Between do not constitute circuit, therefore thunder-strike current can not flow to ground wire from firewire or flow to ground wire from zero curve, so as to avoid thunder
Hit electric current and flow through component between firewire and ground wire or zero curve and ground wire for a long time, avoid these components initiate it is showing tremendous enthusiasm,
And then it avoids that fire occurs；
Inductance in circuit is common mode inductance, when lightning protection circuit is by being struck by lightning, since thunder-strike current is very big, and common mode electricity
Sense has the function of obstruction electric current, and after common mode inductance corresponding circuit conducting, most thunder-strike current can pass through the circuit
It is flow to late-class circuit, and the damage in order to avoid excessive electric current to the component in late-class circuit, further includes in the circuit
Resistance, which flows through the electric current of the circuit for decaying, so that electric current becomes smaller, to protect late-class circuit from super-high-current
Damage, capacitor and zener diode in circuit can make circuit more stable.
The specific embodiments described herein are merely examples of the spirit of the present invention.The utility model institute
Belonging to those skilled in the art can make various modifications or additions to the described embodiments or using similar
Mode substitute, but without departing from the spirit of the present application or beyond the scope of the appended claims.
Claims (4)
1. a kind of 485 communication bus lightning protection circuits for mqtt gateway characterized by comprising
Bleeder circuit, safety protective circuit, composite symmetrical circuit, bleeder circuit；
The input terminal connection of output end and safety protective circuit of bleeder circuit and the input terminal of composite symmetrical circuit connect；
The output end of safety protective circuit and the input terminal of bleeder circuit connect；The output end of composite symmetrical circuit and bleeder circuit it is defeated
Enter end connection；
Bleeder circuit includes: capacitor C1, varistor PT1, the first temperature protection pipe, resistance R1, resistance R2, inductance L1；
The one end capacitor C1 is connect with firewire import and one end of varistor PT1, the other end ground connection of capacitor C1, pressure-sensitive electricity
Hinder one end and the resistance R2 of one end connection capacitor C1 of PT1, one end of resistance R1, the other end connection the of varistor PT1
One end of one temperature protection pipe, the other end of the first temperature protection pipe connect safety protective circuit, the other end connection of resistance R2
Safety protective circuit, one end of the other end connection inductance L1 of resistance R1, the other end of inductance L1 connect composite symmetrical circuit, use
In voltage, circuit is protected.
2. a kind of 485 communication bus lightning protection circuits for mqtt gateway according to claim 1, which is characterized in that peace
Full protection circuit includes: capacitor C3, varistor PT3, varistor PT4, third temperature protection pipe, the 4th temperature protection pipe,
Resistance R4, inductance L2；
One end of capacitor C3 is connect with zero curve import and one end of varistor PT3, one end of resistance R4, and capacitor C3's is another
One end ground connection, one end of the other end connection inductance L2 of resistance R4, the other end of inductance L2 connect composite symmetrical circuit；Pressure-sensitive electricity
The other end for hindering PT3 connects third temperature protection pipe, and the other end of third temperature protection pipe connects the one of the 4th temperature protection pipe
End and bleeder circuit, one end of the other end connection varistor PT4 of the 4th temperature protection pipe, varistor PT4's is another
End connection bleeder circuit.
3. a kind of 485 communication bus lightning protection circuits for mqtt gateway according to claim 1, which is characterized in that multiple
Closing symmetric circuit includes: varistor PT2, varistor PT5, varistor PT6, second temperature protection pipe, the 5th temperature guarantor
Pillar, the 6th temperature protection pipe, capacitor C2, capacitor C4, zener diode TVS1, zener diode TVS2；
One end connection bleeder circuit of varistor PT2 and one end of resistance R3, one end of capacitor C2, zener diode
One end of TVS1, and connect firewire outlet, one end of the other end connection second temperature protection pipe of varistor PT2, the second temperature
Spend one end and the safety protective circuit of the other end connection varistor PT5 of protection pipe, one end of capacitor C4, two pole of pressure stabilizing
One end of pipe TVS2, the other end of varistor PT5 connect the 5th temperature protection pipe, the other end connection of the 5th temperature protection pipe
One end of bleeder circuit and the 6th temperature protection pipe, the one of the other end connection varistor PT5 of the 6th temperature protection pipe
End, the other end of the other end connection resistance R3 of varistor PT5, capacitor C2 other end ground connection, zener diode TVS1's is another
One end ground connection, the other end ground connection of capacitor C4, the other end ground connection of zener diode.
4. a kind of 485 communication bus lightning protection circuits for mqtt gateway according to claim 1, which is characterized in that let out
Galvanic electricity stream includes: the 6th ceramic gas discharge tube, the 7th ceramic gas discharge tube；
One end of 6th ceramic gas discharge tube connects one end and the protective grounding of the 7th ceramic gas discharge tube, the 6th pottery
The other end of porcelain gas-discharge tube connects composite symmetrical circuit, the other end connection safeguard protection electricity of the 7th ceramic gas discharge tube
Road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920112753.XU CN209488171U (en) | 2019-01-23 | 2019-01-23 | A kind of 485 communication bus lightning protection circuits for mqtt gateway |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920112753.XU CN209488171U (en) | 2019-01-23 | 2019-01-23 | A kind of 485 communication bus lightning protection circuits for mqtt gateway |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209488171U true CN209488171U (en) | 2019-10-11 |
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ID=68132201
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920112753.XU Active CN209488171U (en) | 2019-01-23 | 2019-01-23 | A kind of 485 communication bus lightning protection circuits for mqtt gateway |
Country Status (1)
| Country | Link |
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| CN (1) | CN209488171U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111355224A (en) * | 2020-03-20 | 2020-06-30 | 海信（山东）空调有限公司 | Protection circuit and electrical apparatus of controller |
-
2019
- 2019-01-23 CN CN201920112753.XU patent/CN209488171U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111355224A (en) * | 2020-03-20 | 2020-06-30 | 海信（山东）空调有限公司 | Protection circuit and electrical apparatus of controller |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 315016 room 1-69, No.50 houmojia lane, Haishu District, Ningbo City, Zhejiang Province Patentee after: Brantu Smart Technology Co.,Ltd. Address before: 315016 room 1-69, No.50 houmojia lane, Haishu District, Ningbo City, Zhejiang Province Patentee before: ZHEJIANG BULANTU SMART ENERGY TECHNOLOGY Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |