CN107611957A - Surging protection circuit and power supply unit - Google Patents
Surging protection circuit and power supply unit Download PDFInfo
- Publication number
- CN107611957A CN107611957A CN201710945870.XA CN201710945870A CN107611957A CN 107611957 A CN107611957 A CN 107611957A CN 201710945870 A CN201710945870 A CN 201710945870A CN 107611957 A CN107611957 A CN 107611957A
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- Prior art keywords
- protection circuit
- surging protection
- esd device
- ethernet transformer
- circuit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The invention discloses a kind of surging protection circuit and power supply unit, including the Ethernet transformer connected by differential signal line and Network Interface Module, Differential Input module and difference output module are connected to by differential signal line in the side of Ethernet transformer, the centre tap of Ethernet transformer is grounded by a discharge circuit；Surging protection circuit also includes a filter circuit in parallel with discharge circuit, and filter circuit is connected with Ethernet transformer and Network Interface Module respectively, one end ground connection of filter circuit.Surging protection circuit proposed by the present invention can effectively be eliminated the mutation voltage caused by electrostatic with electric current, so as to which at utmost electric equipment is protected in Shangdi.
Description
Technical field
The present invention relates to field of circuit technology, more particularly to a kind of surging protection circuit and power supply unit.
Background technology
With economy continuous development and science and technology continuous lifting, internet in daily life
Become extremely to popularize, for the commercial affairs work of people, living and travelling outdoors etc. at home provides a great convenience.
At present, access interface largely uses and uses the access in radio based on 802.3 standards in the Internet, applications, almost
The equipment of all wire accessing interconnected networks is required to use physical interface and its system based on 802.3 standards, such as router,
Ethernet switch, hub, fiber optical transceiver, modem, network multimedia terminal, computer and IP phone
Deng.For 802.3 standards, what is be most widely used is the network interface based on 10Mbps, 100Mbps, 1000Mbps.
However, the existing chip that Interface design is carried out based on 802.3 standards, its barrier propterty are uneven.In reality
It is easy in because the factors such as electrostatic interference, surge impact or Voltage Drop cause the damage of chip, particularly in thunderstorm
Season, then lose even more serious.
The content of the invention
Therefore, the invention aims to solve existing chip because electrostatic interference or surge impact factor cause to damage
Bad the problem of, spy propose a kind of surging protection circuit and power supply unit.
The present invention proposes a kind of surging protection circuit, including the Ethernet transformer and net connected by differential signal line
Network interface module, Differential Input module and difference are connected to by differential signal line in the side of the Ethernet transformer
Divide output module, the centre tap of the Ethernet transformer is grounded by a discharge circuit；
The surging protection circuit also includes a filter circuit in parallel with the discharge circuit, the filter circuit difference
It is connected with the Ethernet transformer and the Network Interface Module, one end ground connection of the filter circuit, the electric discharge electricity
Road and the filter circuit are used to discharge mutation voltage caused by electrostatic and electric current into GND loops；
The Differential Input module and the difference output module are used to enter the mutation voltage and electric current of residual
Row release.
Surging protection circuit proposed by the present invention, by by the centre tap of Ethernet transformer connect a discharge circuit with
And filter circuit, wherein discharge circuit and filter circuit can discharge mutation voltage caused by electrostatic and electric current to GND
In loop, to eliminate most mutation voltage and electric current；In addition, it is also associated with difference in the side of the Ethernet transformer
Input module and difference output module, the Differential Input module and difference output module can by remnants mutation voltage with
And electric current is thoroughly discharged, mutation voltage and electric current caused by electrostatic are eliminated to electronic equipments such as chips with utmost Shangdi
Influence.
The surging protection circuit, wherein, the Ethernet transformer includes the chip side winding and line being oppositely arranged
Side winding, the line side winding are also connected with a co-mode coil, and the tapped side is connected with the line side winding, separately
Side is grounded by the discharge circuit.The setting can be by mutation voltage caused by electrostatic by centre tap, through electric discharge electricity
Road is discharged to earth terminal, to eliminate the influence of electrostatic as much as possible.
The surging protection circuit, wherein, the difference output module includes the first ESD device, first ESD device
For Transient Suppression Diode or polymeric material ESD device, the difference output module also includes the first electric capacity, first electricity
One end ground connection of appearance, the other end are connected with the chip side winding.First ESD device can enter the mutation voltage electric current of residual
The follow-up release of row, thoroughly to eliminate the influence of electrostatic.
The surging protection circuit, wherein, the Differential Input module includes the second ESD device, second ESD device
For Transient Suppression Diode or polymeric material ESD device, the Differential Input module also includes the second electric capacity, second electricity
One end ground connection of appearance, the other end are connected with the chip side winding.Second ESD device can enter the mutation voltage electric current of residual
The follow-up release of row, thoroughly to eliminate the influence of electrostatic.
The surging protection circuit, wherein, the capacitance of first ESD device and second ESD device is small
In 10pF.The capacitance obtains the first ESD device and the second ESD device has faster response time and stronger resistance to electrostatic
Impact capacity, there is longer service life.
The surging protection circuit, wherein, the discharge circuit includes a discharge tube, and the discharge tube is put for ceramic gas
Fulgurite, one end ground connection of the ceramic gas discharge tube.
The surging protection circuit, wherein, the filter circuit include first resistor parallel with one another, second resistance and
3rd resistor, one end of the first resistor are connected with the centre tap of the Ethernet transformer, the other end and the 3rd electric capacity
Connection, one end of the second resistance and 3rd resistor is connected with the Network Interface Module, and the other end is with the described 3rd
Capacitance connection, one end ground connection of the 3rd electric capacity.The filter circuit not only has the function that extinguishing arc, can also produce electrostatic
Mutation voltage electric current further discharged.
The surging protection circuit, wherein, the resistance of the first resistor, the second resistance and the 3rd resistor
It is 68 Ω.The resistance of the resistance, has a preferable eye pattern effect, and signal transmission rate is very fast.
The surging protection circuit, wherein, the Network Interface Module at least one end is grounded.
The present invention also proposes a kind of power supply unit, wherein, the power supply unit is provided with carrying out surge protection electricity as described above
Road.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination accompanying drawings below to embodiment
Substantially and it is readily appreciated that, wherein：
Fig. 1 is the overall structure diagram of the surging protection circuit in first embodiment of the invention；
Fig. 2 is the overall structure diagram of the surging protection circuit in second embodiment of the invention；
Fig. 3 be Fig. 2 shown in surging protection circuit in difference output module schematic enlarged-scale view；
Fig. 4 be Fig. 2 shown in surging protection circuit in Differential Input module schematic enlarged-scale view；
Fig. 5 be Fig. 2 shown in surging protection circuit in Ethernet transformer schematic enlarged-scale view；
Fig. 6 be Fig. 2 shown in surging protection circuit in filter circuit schematic enlarged-scale view.
Embodiment
In order to facilitate the understanding of the purposes, features and advantages of the present invention, below in conjunction with the accompanying drawings to the present invention
Embodiment be described in detail.Some embodiments of the present invention are given in accompanying drawing.But the present invention can be with perhaps
More different form is realized, however it is not limited to embodiment described herein.On the contrary, the purpose for providing these embodiments is to make
To the disclosure more thorough and comprehensive.
It should be noted that when element is referred to as " being fixedly arranged on " another element, it can be directly on another element
Or there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side ", " on ", " under " and similar statement is for illustrative purposes only, rather than instruction or the device or member that imply meaning
Part must have specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；It can be machine
Tool connects or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, can be two members
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair as the case may be
Concrete meaning in bright.Term as used herein " and/or " include the arbitrary of one or more related Listed Items and
All combinations.
Network chip equipment is in actual applications, it is easy to occurs due to electrostatic interference, surge impact or Voltage Drop etc.
Factor causes wafer damage, particularly in thunderstorm season, then loses even more serious.In order to solve this problem, the present invention proposes
A kind of surging protection circuit.Referring to Fig. 1, the surging protection circuit in first embodiment of the invention, including Ethernet transformation
Device 13 and Network Interface Module 14, wherein, pass through a pair of positive differentials between Ethernet transformer 13 and Network Interface Module 14
Signal wire and the connection of a pair of negative differential signal lines, be connected with the side of Ethernet transformer 13 Differential Input module 12 and
Difference output module 11, wherein, Differential Input module 12 and difference output module 11 also by a pair of differential signal lines with
The Ethernet transformer 13 connects.
For the Ethernet transformer 13, the centre tap of the Ethernet transformer 13 is connect by a discharge circuit 15
Ground.The discharge circuit 15 includes a discharge tube, and in the present embodiment, the discharge tube is ceramic gas discharge tube.Due to the ceramics
Gas-discharge tube is grounded, and will can be discharged because of mutation voltage caused by electrostatic and electric current into GND loops, so as to eliminate mutation
The infringement of voltage and electric current to electronic chip.
In addition, the surging protection circuit also includes one end connection Ethernet of filter circuit 16, the wherein filter circuit 16
The centre tap of transformer 13, the other end are connected with Network Interface Module 14.The filter circuit 16 and (the ceramic gas of discharge circuit 15
Body discharge tube) be essentially parallel relationship, in actual setting, the distance between the filter circuit 16 and discharge circuit 15 compared with
Closely, the filter circuit 16 can not only play extinguishing arc effect to whole circuit, and because the filter circuit 16 is in actual installation
In be also grounded, therefore can also eliminate because of mutation voltage caused by electrostatic and electric current, mitigate mutation voltage electric current to electronic chip
Infringement.
At the same time, in actual applications, above-mentioned discharge circuit 15 (ceramic gas discharge tube) and filter circuit 16
Mutation voltage caused by electrostatic and electric current can not be discharged completely, it is possible to can also there is certain residual voltage electric current, and
Above-mentioned Differential Input module 12 and difference output module 11, can be by the prominent of residual due to including an ESD Anti-static devices
Power transformation current voltage carries out whole releases, so that the influence of electrostatic is completely eliminated, protects the normal use of electronic chip to the full extent.
Surging protection circuit proposed by the present invention, by the way that the centre tap of Ethernet transformer 13 is connected into a discharge circuit
15 and filter circuit 16, wherein discharge circuit 15 and filter circuit 16 discharges mutation voltage caused by electrostatic and electric current
Into GND loops, to eliminate most mutation voltage and electric current；In addition, also connect in the side of the Ethernet transformer 13
Differential Input module 12 and difference output module 11 are connected to, the Differential Input module 12 and difference output module 11 can incite somebody to action
Remaining mutation voltage and electric current is thoroughly discharged, and mutation voltage and electric current caused by electrostatic are eliminated with utmost Shangdi
Influence to electronic equipments such as chips.
Further, Fig. 2 to Fig. 6 is referred to, as a specific example, the difference output module 11 includes first
ESD device 111, wherein first ESD device 111 can be Transient Suppression Diode or polymeric material ESD device.In this reality
Apply in example, first ESD device is ESD Anti-static devices made of polymeric material.In addition, the difference output module 11 is also wrapped
The first electric capacity 112, one end ground connection of first electric capacity 112 are included, the other end connects with the chip side winding in Ethernet transformer 13
Connect.
The Differential Input module 12 includes the second ESD device 121, likewise, second ESD device 121 can also be
Transient Suppression Diode or polymeric material ESD device.In the present embodiment, second ESD device 121 is polymeric material system
Into ESD Anti-static devices.In addition, the Differential Input module 12 also includes the second electric capacity 122, one end of second electric capacity 122
Ground connection, the other end are connected with the chip side winding in Ethernet transformer 13.
In this respect it is to be noted that the capacitance of the above-mentioned ESD device 121 of first ESD device 111 and second is respectively less than
10pF.The first ESD device 111 used in the present embodiment and the response time of the second ESD device 121 are fast, and by electrostatic
The number for carrying out repercussion can reach 20,000 times, have longer service life.In addition, the first electric capacity 112 is with the second electric capacity 122
Blocking filter capacitor, plays filter action.
The Ethernet transformer 13 includes the chip side winding 131 and line side winding 132 being oppositely arranged, wherein line side
Winding 132 is also connected with a co-mode coil 133, and tapped side is connected with line side winding 132, and opposite side passes through the electricity that discharges
Road 15 (ceramic gas discharge tube) is grounded.Wherein, chip side winding 131 corresponds to the differential impedance network in 100 Europe, and line side around
It is 150 Europe differential impedance networks corresponding to group 132.In addition, can be with the co-mode coil 133 that the right side of line side winding 132 is set
The interference of suppression common mode noise.
The filter circuit 16 includes first resistor 161 parallel with one another, second resistance 162 and 3rd resistor 163, its
In, one end of first resistor 161 is connected with the centre tap of Ethernet transformer 13, and the other end is connected with the 3rd electric capacity 160.The
One end of two resistance 162 and 3rd resistor 163 is connected with Network Interface Module 14, and the other end is connected with the 3rd electric capacity 160
(first resistor 161, second resistance 162, the electric capacity 160 of 3rd resistor 163 and the 3rd composition RC filter circuits).Wherein, this
One end ground connection of three electric capacity 160.In the present embodiment, the first resistor 161, second resistance 162 and 3rd resistor 163
Resistance is 68 Ω.Experiment shows that from the resistance of the resistance, in the test of actual eye pattern, eye pattern effect is preferable, signal transmission
Speed is very fast.
For the Network Interface Module 14, the Network Interface Module 14 at least one end is grounded.In addition, TPTX+ with
TPTX_ is a pair of differential output signals, and TPRX+ and TPRX_ is a pair of differential input signals.
Practical application protection in, when electrostatic (such as under thunder and lightning environment) be present in the external world, due to electrostatic can produce it is prominent
Time variant voltage and electric current, mutation voltage electric current in Ethernet transformer 13 by centre tap, be sent to discharge circuit 15 and
In filter circuit 16, due to the ceramic gas discharge tube ground connection set in discharge circuit 15, ceramic gas discharge tube will can dash forward
Time variant voltage and electric current are discharged in greatly；In addition, first resistor 161, second resistance 162,3rd resistor in filter circuit 16
163 and the 3rd electric capacity 160 constitute a RC filter circuits, the filter circuit 16 not only can play extinguishing arc to whole circuit
Effect, and because the 3rd electric capacity 160 is grounded, mutation voltage electric current will can be discharged in time as caused by electrostatic.
Further, since discharge circuit 15 (ceramic gas discharge tube) and filter circuit 16 will can not dash forward caused by electrostatic
Time variant voltage and electric current discharge completely, it is possible to can also have certain residual voltage electric current.In order to eliminate this part of residual electricity
Current voltage, the first ESD device 111 being arranged in difference output module 11 and be arranged in Differential Input module 12 second
ESD device 121, the voltage x current of the residual can timely and effectively be discharged, so as to be completely eliminated caused by electrostatic
Influence, ensure that the normal use of electronic chip.
In addition, the present invention also proposes a kind of power supply unit, wherein, the power supply unit is provided with surge as described above
Protection circuit, due to that can prevent as much as possible because of influence caused by electrostatic surge, therefore extend actual life.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be any
One or more embodiments or example in combine in an appropriate manner.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of surging protection circuit, including the Ethernet transformer and Network Interface Module connected by differential signal line,
Characterized in that, Differential Input module and difference are connected to by differential signal line in the side of the Ethernet transformer
Divide output module, the centre tap of the Ethernet transformer is grounded by a discharge circuit；
The surging protection circuit also includes a filter circuit in parallel with the discharge circuit, the filter circuit respectively with institute
State Ethernet transformer and the Network Interface Module connection, the filter circuit one end ground connection, the discharge circuit with
And the filter circuit is used to discharge mutation voltage caused by electrostatic and electric current into GND loops；
The Differential Input module and the difference output module are used to be released the mutation voltage and electric current of residual
Put.
2. surging protection circuit according to claim 1, it is characterised in that the Ethernet transformer includes being oppositely arranged
Chip side winding and line side winding, the line side winding also connects with a co-mode coil, the tapped side with
The line side winding connection, opposite side are grounded by the discharge circuit.
3. surging protection circuit according to claim 2, it is characterised in that the difference output module includes the first ESD
Device, first ESD device are Transient Suppression Diode or polymeric material ESD device, and the difference output module is also wrapped
The first electric capacity, one end ground connection of first electric capacity are included, the other end is connected with the chip side winding.
4. surging protection circuit according to claim 3, it is characterised in that the Differential Input module includes the 2nd ESD
Device, second ESD device are Transient Suppression Diode or polymeric material ESD device, and the Differential Input module is also wrapped
The second electric capacity, one end ground connection of second electric capacity are included, the other end is connected with the chip side winding.
5. surging protection circuit according to claim 4, it is characterised in that first ESD device and described second
The capacitance of ESD device is respectively less than 10pF.
6. surging protection circuit according to claim 2, it is characterised in that the discharge circuit includes a discharge tube, institute
It is ceramic gas discharge tube to state discharge tube, and one end of the ceramic gas discharge tube is grounded.
7. surging protection circuit according to claim 2, it is characterised in that the filter circuit includes parallel with one another the
One resistance, second resistance and 3rd resistor, one end of the first resistor and the centre tap of the Ethernet transformer connect
Connecing, the other end and the 3rd capacitance connection, one end of the second resistance and 3rd resistor are connected with the Network Interface Module,
The other end is grounded with the 3rd capacitance connection, one end of the 3rd electric capacity.
8. surging protection circuit according to claim 7, it is characterised in that the first resistor, the second resistance with
And the resistance of the 3rd resistor is 68 Ω.
9. surging protection circuit according to claim 7, it is characterised in that the Network Interface Module at least one terminates
Ground.
10. a kind of power supply unit, it is characterised in that the power supply unit is provided with such as above-mentioned claim 1 to 9 any one institute
The surging protection circuit stated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710945870.XA CN107611957A (en) | 2017-09-30 | 2017-09-30 | Surging protection circuit and power supply unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710945870.XA CN107611957A (en) | 2017-09-30 | 2017-09-30 | Surging protection circuit and power supply unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107611957A true CN107611957A (en) | 2018-01-19 |
Family
ID=61068274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710945870.XA Pending CN107611957A (en) | 2017-09-30 | 2017-09-30 | Surging protection circuit and power supply unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107611957A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109347081A (en) * | 2018-12-19 | 2019-02-15 | 广州广电计量检测股份有限公司 | A kind of high-grade carrying out surge protection and the design of the ethernet interface circuit of high EMI performance |
| CN114221313A (en) * | 2021-12-07 | 2022-03-22 | 深圳市共进电子股份有限公司 | Protection system and floating equipment |
| CN115513924A (en) * | 2022-09-16 | 2022-12-23 | 安徽南瑞中天电力电子有限公司 | Protection system for collecting terminal Ethernet communication |
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| CN201097449Y (en) * | 2007-06-12 | 2008-08-06 | 中兴通讯股份有限公司 | A lightning prevention Ethernet port circuit |
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| CN103457252A (en) * | 2012-06-01 | 2013-12-18 | 富士康(昆山)电脑接插件有限公司 | Common-mode signal protective circuit and electric connector with same |
| CN105959063A (en) * | 2016-06-16 | 2016-09-21 | 青岛海信宽带多媒体技术有限公司 | Electrical port module |
| CN205863913U (en) * | 2016-08-11 | 2017-01-04 | 四川天邑康和通信股份有限公司 | A kind of Ethernet network interface surging protection circuit |
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| CN201097449Y (en) * | 2007-06-12 | 2008-08-06 | 中兴通讯股份有限公司 | A lightning prevention Ethernet port circuit |
| CN201766354U (en) * | 2010-08-12 | 2011-03-16 | 杭州华三通信技术有限公司 | Power over Ethernet (POE) equipment and interface circuit thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109347081A (en) * | 2018-12-19 | 2019-02-15 | 广州广电计量检测股份有限公司 | A kind of high-grade carrying out surge protection and the design of the ethernet interface circuit of high EMI performance |
| CN114221313A (en) * | 2021-12-07 | 2022-03-22 | 深圳市共进电子股份有限公司 | Protection system and floating equipment |
| CN114221313B (en) * | 2021-12-07 | 2023-09-15 | 深圳市共进电子股份有限公司 | Protection system and floating equipment |
| CN115513924A (en) * | 2022-09-16 | 2022-12-23 | 安徽南瑞中天电力电子有限公司 | Protection system for collecting terminal Ethernet communication |
| CN115513924B (en) * | 2022-09-16 | 2024-02-23 | 安徽南瑞中天电力电子有限公司 | Protection system for Ethernet communication of acquisition terminal |
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Application publication date: 20180119 |