CN108281949A - RS422 communication bus lightning protection and surge restraint circuit - Google Patents
RS422 communication bus lightning protection and surge restraint circuit Download PDFInfo
- Publication number
- CN108281949A CN108281949A CN201810234670.8A CN201810234670A CN108281949A CN 108281949 A CN108281949 A CN 108281949A CN 201810234670 A CN201810234670 A CN 201810234670A CN 108281949 A CN108281949 A CN 108281949A
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- Prior art keywords
- diode
- capacitance
- discharge tube
- gas discharge
- resistance
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/044—Physical layout, materials not provided for elsewhere
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of RS422 communication bus lightning protection and surge restraint circuits, including first gas discharge tube, second gas discharge tube, first resistor, second resistance, the first diode, the second diode, third diode, the first capacitance, the second capacitance and coupling inductance, the suppression circuit is connected between RS422 buses and external circuit；RS422 communication bus lightning protection and surge restraint circuit of the present invention realize the effect that lightning Protection and Surge suppression are carried out to RS422 buses by the cooperation of gas-discharge tube, resistance, diode, capacitance and inductance.
Description
Technical field
The present invention relates to the communications field more particularly to a kind of RS422 communication bus lightning protections and surge restraint circuit.
Background technology
RS422 communication bus individually sends and receives channel since it has, and does not have to special control data direction.It is maximum
Communication distance can reach 4000 feet, peak transfer rate 10Mb/s.Its difference touch transmission characteristic make it have it is higher anti-dry
Ability is disturbed, in the occasion that many industrial circles, especially communication data throughput are of less demanding, RS422 is preferred communication bus.
In many application scenarios, especially aviation airborne equipment, various sensors and control device are required to collected data
By RS422 bus transfers to control system, while needing to receive the control instruction from control system.These sensors and
Control device data traffic is comparatively little, so easy to control, the stronger RS422 communication modes of anti-interference ability are just
Become first choice.
But industrial control field, especially aviation airborne equipment are due to the features such as device space density is high, integrated level is high.
And aircraft is in high-altitude flight, inevitably by the damage being struck by lightning.Work as control device, especially with the relevant equipment of winged control by
When broken by lightning, flight safety will be seriously threatened.Lightning protection is carried out to RS422 communication bus at this time and surge presses down
System just seems particularly necessary.
Aviation airborne equipment lightning protection testing standard refers to RTCA DO-160 more in the world at present, at present its latest edition
This is G.Due to aircraft aerodynamic arrangement and Structural Design Requirement, airborne equipment is put in inside cabin skin more.The more cabins DO-160
The lightning protection rank of interior equipment is distinctly claimed, and common waveform injection mode is stitch injection and bunch of cables injection, and electric
The injection of cable beam is divided into as single and Return stroke level, multiburst incoming level.Aviation airborne equipment mostly uses B3G33 experiments
Classification.Wherein B indicates that contact pin injection waveform coupling classification is that aperture and resistance couple, and level grade is 3, to waveform
VOC/ISC (open-circuit voltage/short circuit current) is 600/24 and 300/300.G indicates that bunch of cables injection testing waveform classification is non-screen
It covers, is aperture-coupled, it is 3 that single, which fights back level grade, and it is 300/600 and 600/120 to correspond to waveform VOC/ISC, bunch of cables
Return stroke waveform is 300/300 and 600/120, and counterattack followed by is 150/150 and 300/60.Multiburst experiment electricity
Put down is 360/60.
Above-mentioned lightning stroke voltage/current, which is applied on the equipment communications cable, will cause equipment irreversible damage, so
It needs specially to increase lightning stroke and device of surge protector (dress on communication line when aviation airborne equipment has lightning Protection requirement
It sets).
Invention content
The purpose of the present invention is that provides a kind of RS422 communication bus lightning protection and wave to solve the above-mentioned problems
Gush suppression circuit.
The present invention is achieved through the following technical solutions above-mentioned purpose：
A kind of RS422 communication bus lightning protection and surge restraint circuit, including first gas discharge tube, second gas are put
Fulgurite, first resistor, second resistance, the first diode, the second diode, third diode, the first capacitance, the second capacitance and coupling
Close inductance；
The ends P1 of the first end of the first gas discharge tube and the first end of the first resistor and the suppression circuit
The ends the P3 electricity of electrical connection, the first end of the second gas discharge tube and the first end of the second resistance and the suppression circuit
It is grounded after the second end electrical connection of connection, the second end of the first gas discharge tube and the second gas discharge tube；
First end, the first end of first capacitance and the institute of the second end of the first resistor and first diode
State the 1 end electrical connection of coupling inductance, first end, second electricity of the second end of the second resistance and the third diode
2 ends of the first end of appearance and the coupling inductance are electrically connected, first end and first diode of second diode
Second end and the electrical connection of the second end of the third diode, the second end ground connection of second diode, second capacitance
Second end and first capacitance second end electrical connection after be grounded, 4 ends of the coupling inductance and the suppression circuit
The ends P2 are electrically connected, and 3 ends of the coupling inductance are electrically connected with the ends P4 of the suppression circuit.
Specifically, the ends P1 and the ends P3 are the suppression circuit external connection terminal, the ends P2 and the ends P4
For the inside connecting pin of the suppression circuit.
Preferably, the first gas discharge tube and the gas-discharge tube that the second gas discharge tube is low capacitance,
And its breakdown voltage is 90V；
The first resistor and the second resistance are power resistor, and resistance value is 10 Ω；
First diode, second diode and the third diode are that voltage clamp bit-type transient state inhibits two
Pole pipe；
First capacitance and second capacitance are common mode filtering capacitance, capacitance 470pF；
The coupling inductance is air core inductor, and inductance value is 50 μ H.
The beneficial effects of the present invention are：
RS422 communication bus lightning protection and surge restraint circuit of the present invention pass through gas-discharge tube, resistance, two
The effect that lightning Protection and Surge suppression are carried out to RS422 buses is realized in the cooperation of pole pipe, capacitance and inductance.
Description of the drawings
Fig. 1 is the circuit diagram of RS422 communication bus lightning protection and surge restraint circuit of the present invention.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings：
As shown in Figure 1, a kind of RS422 communication bus lightning protection of the present invention and surge restraint circuit, including first gas
Discharge tube V1, second gas discharge tube V2, first resistor R1, second resistance R2, the first diode D1, the second diode D2,
Three diode D3, the first capacitance C1, the second capacitance C2 and coupling inductance L1；
The first end of first gas discharge tube V1 and the first end of first resistor R1 are electrically connected with the ends P1 of suppression circuit, the
The first end of two gas-discharge tube V2 and the first end of second resistance R2 are electrically connected with the ends P3 of suppression circuit, first gas electric discharge
It is grounded after the second end of pipe V1 and the second end electrical connection of second gas discharge tube V2；The second end of first resistor R1 and the one or two
1 end of the first end of pole pipe D1, the first end of the first capacitance C1 and coupling inductance L1 is electrically connected, the second end of second resistance R2 with
2 ends of the first end of third diode D3, the first end of the second capacitance C2 and coupling inductance L1 are electrically connected, the second diode D2's
First end is electrically connected with the second end of the second end of the first diode D1 and third diode D3, the second end of the second diode D2
It is grounded after the second end electrical connection of ground connection, the second end of the second capacitance C2 and the first capacitance C1,4 ends and the inhibition of coupling inductance L1
The ends P2 of circuit are electrically connected, and 3 ends of coupling inductance L1 are electrically connected with the ends P4 of suppression circuit, and the ends P1 and the ends P3 are outside suppression circuit
Portion connecting pin, the ends P2 and the ends P4 are the inside connecting pin of suppression circuit.
First gas discharge tube V1 and second gas discharge tube V2 is the gas-discharge tube of low capacitance, and its breakdown voltage
For 90V；First resistor R1 and second resistance R2 is power resistor, and resistance value is 10 Ω；First diode D1, the second diode D2
It is voltage clamp bit-type Transient Suppression Diode with third diode D3；First capacitance C1 and the second capacitance C2 is common mode filtering electricity
Hold, capacitance 470pF；Coupling inductance L1 is air core inductor, and inductance value is 50 μ H.
The operation principle of RS422 communication bus lightning protection and surge restraint circuit of the present invention is as follows：
When lightning strike signals are injected into equipment, first gas discharge tube V1 and second gas discharge tube V2, quilt are first passed around
First gas discharge tube V1 and second gas discharge tube V2 absorb, and arrive residue 90V residual voltages, when two voltage across poles are sufficiently large, pole
Between gap by discharge breakdown, conduction state is converted by original state of insulation, similar short circuit.Two-stage maintains under conduction state
One low voltage, therefore achieve the purpose that protect late-class circuit.
First resistor R1 and second resistance R2 are in signal line, inhibition of the component to high-frequency signal in order to prevent
Greatly, it so carrying out interpolar cooperation using 10 Ω resistance in the design, to meet the versatility of invention, is used in the present invention
Resistor be power resistor as big as possible, avoid the lower resistance of overcurrent effect from being damaged.And it is used in resistance
When as possible use linear resistance, prevent resistance on normal signal transmission shine at influence.
Voltage clamp bit-type Transient Suppression Diode, its main feature is that the corresponding time is fast, nonlinear characteristic is preferable, when two poles of use
Guan Shike with or relatively low residual voltage.
Rear class the first capacitance C1 and the second capacitance C2 is common mode filtering capacitance, when thunder and lightning signal transmission to capacitance terminal, absolutely
Most of energy are absorbed.When apparatus casing is metal shell, the first capacitance C1 and the second capacitance C2 are by interference signal
It filters out to ground, protects signal of communication.
When protection circuit reaches design through-current capacity, the overcurrent on diode is not up to its maximum through-current capacity, passes through coupling
It closes inductance L1 and enough current limiting capacities to overcurrent of being struck by lightning is provided.Inductance issues magnetisation in surge current effect and satisfies in order to prevent
With, in the present invention use air core inductor.
Technical scheme of the present invention is not limited to the limitation of above-mentioned specific embodiment, every to do according to the technique and scheme of the present invention
The technology deformation gone out, each falls within protection scope of the present invention.
Claims (3)
1. a kind of RS422 communication bus lightning protection and surge restraint circuit, it is characterised in that：Including first gas discharge tube,
Second gas discharge tube, first resistor, second resistance, the first diode, the second diode, third diode, the first capacitance,
Two capacitances and coupling inductance；
The first end of the first gas discharge tube and the first end of the first resistor and the ends P1 of the suppression circuit are electrically connected
It connects, the first end of the second gas discharge tube and the first end of the second resistance and the ends P3 of the suppression circuit are electrically connected
It connects, is grounded after the second end electrical connection of the second end of the first gas discharge tube and the second gas discharge tube；
First end, the first end of first capacitance and the coupling of the second end of the first resistor and first diode
Close the 1 end electrical connection of inductance, the first end of the second end of the second resistance and the third diode, second capacitance
2 ends of first end and the coupling inductance are electrically connected, the first end of second diode and the second of first diode
The second end of end and the third diode is electrically connected, the second end of second diode ground connection, and the of second capacitance
It is grounded after the electrical connection of the second end of two ends and first capacitance, 4 ends of the coupling inductance and the ends P2 of the suppression circuit
Electrical connection, 3 ends of the coupling inductance are electrically connected with the ends P4 of the suppression circuit.
2. RS422 communication bus lightning protection according to claim 1 and surge restraint circuit, it is characterised in that：It is described
The ends P1 and the ends P3 are the suppression circuit external connection terminal, the ends P2 and the inside that the ends P4 are the suppression circuit
Connecting pin.
3. RS422 communication bus lightning protection according to claim 1 and surge restraint circuit, it is characterised in that：It is described
First gas discharge tube and the gas-discharge tube that the second gas discharge tube is low capacitance, and its breakdown voltage is 90V；
The first resistor and the second resistance are power resistor, and resistance value is 10 Ω；
First diode, second diode and the third diode are that voltage clamp bit-type transient state inhibits two poles
Pipe；
First capacitance and second capacitance are common mode filtering capacitance, capacitance 470pF；
The coupling inductance is air core inductor, and inductance value is 50 μ H.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810234670.8A CN108281949A (en) | 2018-03-21 | 2018-03-21 | RS422 communication bus lightning protection and surge restraint circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810234670.8A CN108281949A (en) | 2018-03-21 | 2018-03-21 | RS422 communication bus lightning protection and surge restraint circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108281949A true CN108281949A (en) | 2018-07-13 |
Family
ID=62810125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810234670.8A Pending CN108281949A (en) | 2018-03-21 | 2018-03-21 | RS422 communication bus lightning protection and surge restraint circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108281949A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315107A (en) * | 2021-06-16 | 2021-08-27 | 天津津航计算技术研究所 | Be applied to lightning protection circuit of aircraft 1394 bus |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201417941Y (en) * | 2009-06-08 | 2010-03-03 | 杭州华三通信技术有限公司 | Interface protection circuit |
| CN202586325U (en) * | 2012-05-16 | 2012-12-05 | 恒业智能安防（深圳）有限公司 | Lightning-protection surge-proof power source protection device |
| CN204947590U (en) * | 2015-09-22 | 2016-01-06 | 成都新欣神风电子科技有限公司 | Integration lightning protection filter |
-
2018
- 2018-03-21 CN CN201810234670.8A patent/CN108281949A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201417941Y (en) * | 2009-06-08 | 2010-03-03 | 杭州华三通信技术有限公司 | Interface protection circuit |
| CN202586325U (en) * | 2012-05-16 | 2012-12-05 | 恒业智能安防（深圳）有限公司 | Lightning-protection surge-proof power source protection device |
| CN204947590U (en) * | 2015-09-22 | 2016-01-06 | 成都新欣神风电子科技有限公司 | Integration lightning protection filter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315107A (en) * | 2021-06-16 | 2021-08-27 | 天津津航计算技术研究所 | Be applied to lightning protection circuit of aircraft 1394 bus |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180713 |