CN109672157A - Communication port surge protection circuit - Google Patents
Communication port surge protection circuit Download PDFInfo
- Publication number
- CN109672157A CN109672157A CN201811567893.2A CN201811567893A CN109672157A CN 109672157 A CN109672157 A CN 109672157A CN 201811567893 A CN201811567893 A CN 201811567893A CN 109672157 A CN109672157 A CN 109672157A
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- integrated array
- discharge tube
- gas
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- 238000004891 communication Methods 0.000 title claims abstract description 26
- 230000015556 catabolic process Effects 0.000 claims description 13
- 238000007689 inspection Methods 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 abstract description 4
- 208000025274 Lightning injury Diseases 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 230000001052 transient effect Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- 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
- H02H9/005—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection avoiding undesired transient conditions
-
- 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
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
-
- 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
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
-
- 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
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
本发明公开了通信端口浪涌保护电路，包括通信终端接口及其匹配电容电阻、网络变压器、网络芯片；通信终端接口连接的网络变压器的次级中心抽头的公共端连接气体放电管；网络变压器的初级线圈与网络芯片的网络数据接口处连接TVS管集成阵列，数据接口的TX+与TX‑之间连接一个TVS管集成阵列，RX+与RX‑之间连接一个TVS管集成阵列。本发明采用在通信终端输出电路的前级部分加一个气体放电管实现对大部分雷击浪涌能量进行泄放，在通信终端抗雷击浪涌的后级保护电路中加TVS管集成阵列实现对雷击浪涌能量残余能量再次进行泄放，达到保护后面网络接口芯片的目的，电路结构简单，成本低，易实现。
The invention discloses a communication port surge protection circuit, comprising a communication terminal interface and its matching capacitor resistance, a network transformer and a network chip; the public end of the secondary center tap of the network transformer connected to the communication terminal interface is connected to a gas discharge tube; A TVS tube integrated array is connected to the network data interface of the primary coil and the network chip, a TVS tube integrated array is connected between TX+ and TX‑ of the data interface, and a TVS tube integrated array is connected between RX+ and RX‑. In the invention, a gas discharge tube is added to the front stage part of the output circuit of the communication terminal to discharge most of the lightning surge energy, and an integrated array of TVS tubes is added to the post-stage protection circuit of the communication terminal for anti-lightning surge to realize the protection against lightning strikes. The residual energy of the surge energy is discharged again to achieve the purpose of protecting the network interface chip behind. The circuit structure is simple, the cost is low, and it is easy to implement.
Description
Technical field
The invention belongs to surge protection technique fields, more particularly to communication port surge protection circuit.
Background technique
In recent years, with domestic society, economic fast development, utilization process of the various electronic products equipment in every profession and trade
In all suffer from the electromagnetic environment to become increasingly complex, lightning surge is resistant to as EMS(electromagnetism) in one kind, be Electro Magnetic Compatibility
One of aspect.Lightning surge refers to electronic product during application, the overvoltage formed due to lightning stroke etc.
Device port can be damaged with overcurrent, therefore corresponding protection circuit should be designed.At present in the protection circuit of design
It is middle to have voltage clamp bit-type Transient Suppression Diode (TVS), gas-discharge tube, varistor etc. using more.Gas-discharge tube
The features such as although having through-current capacity big, insulation resistance is high, at low cost, its afterflow maintenance voltage under disruptive conduction state is general
In 20~50V, for the operating voltage of this 3.3V or 5V for generalling use for Ethernet chip, the voltage of 20~50V
Wafer damage can be directly resulted in.Varistor is not suitable in the network interface circuits that application is transmitted with 100,000,000 or even gigabit speed.
The response time of voltage clamp bit-type Transient Suppression Diode (TVS) is most fast in votage limit type Surge Protector part, can achieve ps
Grade.The junction capacity of TVS pipe is low, generally in several pF.The nonlinear characteristic of TVS pipe is better than varistor, when the mistake by TVS pipe
When electric current increases, the clamp voltage rate of climb of TVS pipe is slower than varistor, therefore can obtain than varistor more preferably
Residual voltage output.It is relatively good selection using TVS pipe in the electronic circuit for much needing finely to protect.The present invention is communicating
In the anti-lightning surge protection circuit design of port, release most of lightning stroke surge energy in prime plus gas-discharge tube, rear class
TVS pipe is installed additional close to interface chip part come lightning surge residual amount of energy of releasing.
Summary of the invention
The object of the invention is that overcoming existing technical problem, communication port surge protection circuit is provided.
The present invention adopts the following technical solutions carries out:
Communication port surge protection circuit, including communication terminal interface and its matching capacitance resistance, network transformer, network core
Piece；The output port and receiving port of the communication terminal interface are separately connected a network transformer, the network transformer
Secondary centre tap common end connect a gas-discharge tube, gas-discharge tube ground connection；The primary line of the network transformer
Circle with connect TVS pipe integrated array at the network data interface of network chip, each pair of data line TX+ of the data-interface and
A TVS pipe integrated array is connected between TX-, a TVS pipe integrated array is connected between RX+ and RX-, and the TVS pipe is integrated
The grounding pin of array connects signal ground；
The breakdown voltage of the gas-discharge tube is the 2RM1000L-8 of 1000V ± 20%；The TVS pipe integrated array is low electricity
Hold inspection diode and TVS diode is encapsulated in the RClamp3304N in individual devices；The network transformer is 1:1 balance
The network-specific of output exports transformer HR601680, and primary, secondary coil isolation is 1500Vrms.
Preferably, it is public with the secondary centre tap of network transformer after the gas-discharge tube is in conjunction with varistor
End connection.
Preferably, the communication terminal interface is the electric signals outputs such as RJ45 Ethernet interface, difference output, TTL output
Interface.
Preferably, the network chip is an external network interface PHY chip DP83848.
The invention has the following advantages:
The present invention, which is used, adds the method for gas-discharge tube in the prime part of communication port front end output circuit, to realize to big portion
Lightning stroke surge energy is divided to release.Add TVS pipe integrated array in the rear class protection circuit of communication port anti-lightning surge, comes
Realization releases again to residual amount of energy of the lightning stroke surge energy after prime is released, and reaches protection network interface core below
The purpose of piece.The characteristics of this method has circuit structure simple, at low cost, Yi Shixian, can fully meet in IEC 61000-4-5
The requirement of experiment of lightning surge test IV in EMC test, and the circuit structure of whole equipment system itself is had no too big
Increase, meets and consider to require simple, efficient feature when EMC technology in circuit design process.
Detailed description of the invention
Fig. 1 is the circuit structure block diagram in the present invention；
Fig. 2 is the inside schematic diagram of TVS pipe integrated array of the present invention；
Fig. 3 is circuit diagram of the invention；
Fig. 4 is effect schematic diagram of the present invention during protection of anti-lightning surge circuit.
Specific embodiment
With specific embodiment, the invention will be further described below, the invention illustrative examples and illustrate to use
Explain the present invention, but not as a limitation of the invention.
Embodiment 1:
As shown in Figures 1 to 4, communication port surge protection circuit, including communication terminal interface and its matching capacitance resistance, network
Transformer, network chip；The output port and receiving port of the communication terminal interface are separately connected a network transformer, institute
The common end for stating the secondary centre tap of network transformer connects a gas-discharge tube, gas-discharge tube ground connection；The network becomes
At the primary coil of depressor and the network data interface of network chip connect TVS pipe integrated array, the data-interface it is each pair of
A TVS pipe integrated array is connected between data line TX+ and TX-, and a TVS pipe integrated array, institute are connected between RX+ and RX-
The grounding pin for stating TVS pipe integrated array connects signal ground；
The breakdown voltage of the gas-discharge tube is the 2RM1000L-8 of 1000V ± 20%；The TVS pipe integrated array is low electricity
Hold inspection diode and TVS diode is encapsulated in the RClamp3304N in individual devices；The network transformer is 1:1 balance
The network-specific of output exports transformer HR601680, and primary, secondary coil isolation is 1500Vrms.
The gas-discharge tube in conjunction with varistor after connect with the common end of the secondary centre tap of network transformer.
The communication terminal interface is the electrical signal output interfaces such as RJ45 Ethernet interface, difference output, TTL output.
The network chip is an external network interface PHY chip DP83848.
Working principle:
In the common end pin of secondary centre tap of network transformer HR601680, with casing, really indirect one of ground is hit greatly
The gas-discharge tube that voltage is 1000V ± 20% is worn, when external lightning stroke surge energy is introduced by the data line of the RJ45 network port
Afterwards, when gas-discharge tube through network transformer centre cap common end, gas breakdown discharge tube and formed really big to casing
Ground short circuit, make the energy of lightning surge be passed straight back to it is true greatly in.To protect network transformer and network transformer
The circuits such as subsequent network chip.
Network chip PHY chip DP83848 network data interface PHY pin with network transformer HR601680 just
Between grade coil, every a pair of data lines TX+, TX-, RX+, RX- meet a TVS pipe integrated array RClamp3304N, when external thunder
Hit surge energy by RJ45 network port data line it is incoming after, network transformer is secondary, i.e., after the processing of prime protection circuit,
The lightning stroke surge energy of portion of residual is coupled into late-class circuit through network transformer, through TVS pipe integrated array
After RClamp3304N carries out protection processing again, the work for enabling PHY chip DP83848 safe and reliable is in its specified peace
Within full voltage.To protect PHY chip DP83848 and other circuits.Specific protection process is as follows:
The inside schematic diagram of TVS pipe integrated array RClamp3304N as shown in Figure 2, TVS is a kind of pressure limiting protection device, is
Protection using the nonlinear characteristic of device by overvoltage clamper to a lower voltage value realization to late-class circuit.TVS pipe
Integrated array RClamp3304N is one for protecting the low-capacitance TVS integrated array of high speed interface, can be to sensitive member
Part in the data transmission of connection ESD static discharge, good guarantor is played in over-voltage caused by CDE cable discharge and lightning
Shield.TVS pipe integrated array RClamp3304N uses unique design, is encapsulated in low capacitor inspection diode and TVS diode
In individual devices, under transient condition, low capacitor inspection diode instruction transient current ground connection, internal TVS diode clamper wink
Time variant voltage makes it within the scope of level of security, and TVS pipe integrated array RClamp3304N uses solid-state silicon snowslide technology, has low
Leakage current and brilliant 3.3V protect clamp voltage.Low capacitor (< 5pF) characteristic of RClamp3304N makes that it is suitable for high quick access
Mouthful.Protection of the RClamp3304N for high speed data lines transient state meets IEC61000-4-2(ESD) 15kV(air), 8kV(connects
Touching), IEC 61000-4-4(EFT) 40A(5/50ns), IEC 61000-4-5(lightning) 25A(8/20 μ s) requirement, and
The inner wrapping of RClamp3304N designs so that circuit board space is greatly saved, and each RClamp3304N at most can protect
Four I/O interface circuits.Application of the RClamp3304N in the environment that height threatens, such as 10,000,000/100,000,000/gigabit Ethernet, telecommunications
The fields such as route and digital video.
Gas-discharge tube shown in Fig. 3 is a kind of switching mode protection device, and working principle is gas discharge.When two voltage across poles
When sufficiently large, pole clearance is converted into conduction state by discharge breakdown, by original state of insulation, similar short circuit.Conduction state
The voltage that lower two interpolars maintain is very low, generally in 20~50V, therefore can play the effect of protection late-class circuit.Gas discharge
The response time of pipe can achieve hundreds of ns so that counting s.When the Lightning Over-voltage on cable makes gas-discharge tube puncture short,
Initial breakdown voltage is essentially the impact flashover voltage of gas-discharge tube, after discharge tube breakdown conducting under two interpolar maintenance voltages
Drop to 20~50V.On the other hand, the through-current capacity of gas-discharge tube is bigger than varistor and TVS pipe, gas-discharge tube and TVS
When sharing Deng protection device, most overcurrent is set to release by gas-discharge tube, therefore gas-discharge tube is generally used for preventing
The most prime of protection circuit.The insulation resistance of gas-discharge tube is very high, can achieve the magnitude of begohm.The value of interelectrode capacity
It is very small, it is nA grades generally in 5pF hereinafter, interelectrode leakageg stream is very small.Therefore gas-discharge tube is attempted by route to route
Substantially what, which will not be constituted, influences.That we select is the 2RM1000L-8 that breakdown voltage is 1000V ± 20% in the present invention,
The minimum breakdown voltage of 2RM1000L-8 is 800V, maximum breakdown voltage 1200V, insulation resistance 1G Ω, interelectrode capacity
1.5pF。
Network transformer HR601680 in Fig. 3 is the network-specific output transformer of 1:1 Differential Output, primary, secondary
Grade inductance loop seclusion degree is 1500Vrms.Network transformer HR601680 secondary coil centre cap common end with casing
And it is true greatly between connect the gas-discharge tube of a 2RM1000L-8, when the high-voltage great-current energy of lightning surge pass through it is logical
After believing that port interface signals line introduces, the gas of the centre cap common end connection of the secondary coil through network transformer HR601680
Body discharge tube, when the voltage of lightning surge is higher than the breakdown voltage of gas-discharge tube 1000V ± 20%, and not up to network transformation
When the isolation voltage 1500V of the primary secondary of device HR601680, breakdown short circuit, lightning stroke are unrestrained by gas-discharge tube 2RM1000L-8
Gush energy can with quickly returning to casing (really greatly) in.So as to protect well network transformer HR601680 and
The network chip for being connected to network transformer HR601680 primary coil part is not destroyed by lightning stroke surge energy, plays protection thunder
Hit the effect of surge.In this section in circuit design, back-end circuit that network transformer HR601680 primary part is connected
Signal ground GND will keep apart with the connected casing of sub-section, casing will be with really reliably being connected greatly.Simultaneously
Because the insulation resistance of gas-discharge tube 2RM1000L-8 is 1G Ω, breakdown voltage is 800V ~ 1200V, network transformer
The isolation of the primary secondary coil of HR601680 is 1500V, so can expire completely in the dielectric strength test of network interface
Sufficient dielectric strength is greater than the requirement of 500V.
Network interface chip PHY chip DP83848 in Fig. 3 is an external network interface PHY chip.Become in network
The primary coil of depressor HR601680 connects a TVS pipe with the network data interface pin of network chip PHY chip DP83848
Integrated array RClamp3304N.When the big energy of lightning surge is released through the protection circuit of network transformer secondary end prime part
Afterwards, remaining lightning stroke surge energy is coupled through network transformer, is accumulated in the data circuit of network transformer primary coil connection
In lightning stroke surge energy pass through TVS pipe integrated array RClamp3304N when, transient voltage is more than the work of RClamp3304N
When voltage 3.3V, the TVS inside RClamp3304N is connected over the ground, so that the voltage on data circuit is clamped within 3.3V.
To protect subsequent network chip PHY chip DP83848 and other circuits.TVS pipe integrated array RClamp3304N core
The large area grounding pin of piece behind should will be connected on signal ground well, could pass through data in surge residual amount of energy in this way
Line can be good at carrying out energy release over the ground by RClamp3304N when incoming, thus reach protection rear class chip and
The purpose of other circuits.
The limitation that technical solution of the present invention is not limited to the above specific embodiments, it is all to do according to the technique and scheme of the present invention
Technology deformation out, falls within the scope of protection of the present invention.
Claims (4)
1. communication port surge protection circuit, it is characterised in that: become including communication terminal interface and its matching capacitance resistance, network
Depressor, network chip；The output port and receiving port of the communication terminal interface are separately connected a network transformer, described
The common end of the secondary centre tap of network transformer connects a gas-discharge tube, gas-discharge tube ground connection；The network transformation
TVS pipe integrated array, every logarithm of the data-interface are connected at the primary coil of device and the network data interface of network chip
According to a TVS pipe integrated array is connected between line TX+ and TX-, a TVS pipe integrated array is connected between RX+ and RX-, it is described
The grounding pin of TVS pipe integrated array connects signal ground；
The breakdown voltage of the gas-discharge tube is the 2RM1000L-8 of 1000V ± 20%；The TVS pipe integrated array is low electricity
Hold inspection diode and TVS diode is encapsulated in the RClamp3304N in individual devices；The network transformer is 1:1 balance
The network-specific of output exports transformer HR601680, and primary, secondary coil isolation is 1500Vrms.
2. communication port surge protection circuit according to claim 1, it is characterised in that: the gas-discharge tube with it is pressure-sensitive
Resistance is connect after combining with the common end of the secondary centre tap of network transformer.
3. communication port surge protection circuit according to claim 1, it is characterised in that: the communication terminal interface is
RJ45 Ethernet interface, difference output, TTL output, electrical signal output interface.
4. communication port surge protection circuit according to claim 1, it is characterised in that: the network chip is one outer
The network interface PHY chip DP83848 set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811567893.2A CN109672157A (en) | 2018-12-21 | 2018-12-21 | Communication port surge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811567893.2A CN109672157A (en) | 2018-12-21 | 2018-12-21 | Communication port surge protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109672157A true CN109672157A (en) | 2019-04-23 |
Family
ID=66145672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811567893.2A Pending CN109672157A (en) | 2018-12-21 | 2018-12-21 | Communication port surge protection circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN109672157A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110026178A1 (en) * | 2008-03-17 | 2011-02-03 | Huawei Technologies Co., Ltd. | Interface circuit and communication device |
| CN102185303A (en) * | 2011-05-06 | 2011-09-14 | 武汉长光科技有限公司 | Prevention circuit capable of supporting withstand voltage and surge of port simultaneously |
| CN102290804A (en) * | 2010-06-17 | 2011-12-21 | 杭州华三通信技术有限公司 | Ethernet port circuit |
| CN204290308U (en) * | 2014-12-22 | 2015-04-22 | 上海斐讯数据通信技术有限公司 | A kind of lightning protection circuit |
| CN204291004U (en) * | 2015-01-19 | 2015-04-22 | 成都可为科技发展有限公司 | Communication terminal |
| CN207010229U (en) * | 2017-08-08 | 2018-02-13 | 武汉微创光电股份有限公司 | A kind of gigabit Ethernet mouth electromagnetic compatible protective circuit |
-
2018
- 2018-12-21 CN CN201811567893.2A patent/CN109672157A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110026178A1 (en) * | 2008-03-17 | 2011-02-03 | Huawei Technologies Co., Ltd. | Interface circuit and communication device |
| CN102290804A (en) * | 2010-06-17 | 2011-12-21 | 杭州华三通信技术有限公司 | Ethernet port circuit |
| CN102185303A (en) * | 2011-05-06 | 2011-09-14 | 武汉长光科技有限公司 | Prevention circuit capable of supporting withstand voltage and surge of port simultaneously |
| CN204290308U (en) * | 2014-12-22 | 2015-04-22 | 上海斐讯数据通信技术有限公司 | A kind of lightning protection circuit |
| CN204291004U (en) * | 2015-01-19 | 2015-04-22 | 成都可为科技发展有限公司 | Communication terminal |
| CN207010229U (en) * | 2017-08-08 | 2018-02-13 | 武汉微创光电股份有限公司 | A kind of gigabit Ethernet mouth electromagnetic compatible protective circuit |
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Application publication date: 20190423 |
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