CN109347081A - A kind of high-grade carrying out surge protection and the design of the ethernet interface circuit of high EMI performance - Google Patents
A kind of high-grade carrying out surge protection and the design of the ethernet interface circuit of high EMI performance Download PDFInfo
- Publication number
- CN109347081A CN109347081A CN201811561286.5A CN201811561286A CN109347081A CN 109347081 A CN109347081 A CN 109347081A CN 201811561286 A CN201811561286 A CN 201811561286A CN 109347081 A CN109347081 A CN 109347081A
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- China
- Prior art keywords
- circuit
- design
- interface
- ethernet interface
- surge protection
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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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Classifications
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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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
Abstract
The present invention relates to fields of communication technology, and in particular to a kind of high-grade carrying out surge protection and the design of the ethernet interface circuit of high EMI performance.Primary protection circuit (4) are arranged in this circuit design simultaneously, two stages of circuit (1), network transformer (3) and electric source filter circuit (2), common mode surge energy of the primary protection circuit (4) in glitch and cable on limiting circuitry, two stages of circuit (1) is used to that network transformer (3) to be inhibited to couple the surge energy to come, the interference that electric source filter circuit (2) is used to filter out in differential lines prevents interference to be transferred to electric power network, also the interference of power supply can be prevented to be transferred to differential signal simultaneously, it can preferably solve the problems, such as high-grade surge and the EMI interference of interface circuit, and the contradiction between circuit performance and product design costs can be coordinated.
Description
Technical field
The present invention relates to fields of communication technology, more particularly to a kind of design of ethernet interface circuit.
Background technique
Common Ethernet interface is 10/100Base-TX, 10/100Base-2 and 10/100Base-5, is used in reality
In, due to the restriction of mounting distance and environmental condition, the Anti-surging for increasing interface circuit is must be taken into consideration in ethernet switching device
Ability design, guarantees the reliable use of equipment.Simultaneously network communication product to product cost, volumetric spaces, surge protection and
The inhibition of EMI has very high requirement, in the prior art, focuses on anti-common mode surge capacity, the energy of antisurge there are single
Grade is lower, and filtering protective device is more, the higher problem of design cost.
Summary of the invention
Based on this, the present invention provides a kind of high-grade carrying out surge protection and the ethernet interface circuit of high EMI performance to design,
And contradiction between circuit performance and product design costs can be coordinated.
To achieve the goals above, circuit design provided by the invention includes: primary protection circuit, network transformer, two
Grade protection circuit, electric source filter circuit.
The primary protection circuit include on limiting circuitry the Transient Suppression Diode of glitch and at least one
For inhibiting the gas-discharge tube of common mode surge energy on cable, the Transient Suppression Diode is connect with network transformer, gas
One end of body discharge tube is grounded, other end electrical connection network transformer；
The two stages of circuit includes the diode for inhibiting the transformer coupled surge energy to come, two pole
Pipe is connected in parallel in network transformer；
The electric source filter circuit include the filter capacitor being connect with network transformer and with the concatenated electricity of power input
Feel filter, for filtering out the interference in differential lines, prevents interference to be transferred to electric power network, while can also prevent the interference of power supply
It is transferred to differential signal.
Compared with prior art, primary protection circuit, two stages of circuit and filter circuit is arranged simultaneously in this circuit design,
Common mode surge energy of the primary protection circuit in glitch and cable on limiting circuitry, two stages of circuit is for inhibiting
The transformer coupled surge energy to come, the interference that filter circuit is used to filter out in differential lines prevent interference to be transferred to power net
Network, the while also interference of power supply can be prevented to be transferred to differential signal, can preferably solve interface circuit high-grade surge and
The problem of EMI is interfered, and the contradiction between circuit performance and product design costs can be coordinated.
Detailed description of the invention
Technical solution in order to illustrate the embodiments of the present invention more clearly, below will be to needed in embodiment description
Attached drawing is briefly described, it should be apparent that, drawings in the following description are some embodiments of the invention, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the ethernet interface circuit of a kind of high-grade carrying out surge protection and high EMI performance that the embodiment of the present invention proposes
Design.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
Referring to Fig. 1, circuit design of the present invention includes sequentially connected primary protection circuit 4, network transformer 3, second level
Protection circuit 1 and electric source filter circuit 2, the network transformer connect electric source filter circuit；The primary protection circuit includes
The Transient Suppression Diode D3 of glitch is used to inhibit the common mode surge energy on cable at least one on limiting circuitry
The gas-discharge tube GDT1, the Transient Suppression Diode D3 of amount and two pairs of RX and TX interfaces of network transformer are electrically connected,
One end of gas-discharge tube GDT1 is grounded, and the other end connects the TXB-CT interface of network transformer；The two stages of circuit packet
The diode (D1, D2) for inhibiting the transformer coupled surge energy to come is included, the diode is connected in parallel in net respectively
Between network transformer RD+ interface and the output line of RD- interface and between TD+ interface and the output line of TD- interface；The power supply
Filter circuit includes that the filter capacitor connecting with the CT interface of network transformer and the inductance being connected in series with power input are filtered
Wave device L1, inductance filter L1 are for filtering out the interference on signal wire.
By the way that primary protection circuit, two stages of circuit and filter circuit is arranged simultaneously, interface electricity can be preferably improved
The Anti-surging and EMI rejection ability on road, and the contradiction between circuit performance and product design costs can be coordinated.
Transient Suppression Diode D3 is used to for glitch on limiting circuitry, such as: electrostatic, impulse train prevent from interfering
Next stage circuit is influenced by signal wire.
Preferably, the diode in the two stages of circuit is two-way Transient Suppression Diode.
Preferably, component will be laid out according to signal flow, it then follows first protect the principle of post filtering.
Preferably, network transformer primary and secondary circuit on the placement direction of PCB is isolated entirely from, and network becomes
Depressor PCB projection plane layer hollows out processing.
Preferably, each Transient Suppression Diode, gas-discharge tube, filter capacitor, two stages of circuit diode
All it is arranged close to the interface of network transformer, it is ensured that lead-in inductance is minimum, to guarantee that it is dynamic that protective device can normally carry out protection
Make.
Preferably, signal wire TX+, TX- (RX+, RX-) should be routed with difference form balanced, symmetrical, to improve receiving end property
Energy.
Circuit design of the present invention greatly enhances the Ethernet interface protective capacities of the common low side network switching equipment, simultaneously
Can reduction Ethernet interface to the full extent design cost and PCB be laid out difficulty, circuit design through the invention
Circuit protective capacities of the equipment in actual test can achieve following index:
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and replacement can also be made, these are improved and replacement
Also it should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of high-grade carrying out surge protection and the design of the ethernet interface circuit of high EMI performance characterized by comprising
Primary protection circuit, the primary protection circuit include the Transient Suppression Diode of glitch and extremely on limiting circuitry
Few one for inhibiting the gas-discharge tube of the common mode surge energy on cable, the Transient Suppression Diode and network transformer
Two pairs of RX and TX interfaces be electrically connected, one end of gas-discharge tube ground connection, the TXB-CT of other end electrical connection network transformer
Interface；
Two stages of circuit, the two stages of circuit include the diode for inhibiting the transformer coupled surge energy to come,
The diode be connected in parallel between RD+ interface and the output line of RD- interface respectively and TD+ interface and TD- interface it is defeated
Between outlet；
Electric source filter circuit, the electric source filter circuit include the filter capacitor being connect with the CT interface of network transformer and with electricity
The power-supply filter that source input is connected in series.
2. high-grade carrying out surge protection as described in claim 1 and the design of the ethernet interface circuit of high EMI performance, feature exist
In: the diode in the two stages of circuit is two-way Transient Suppression Diode.
3. high-grade carrying out surge protection as described in claim 1 and the design of the ethernet interface circuit of high EMI performance, feature exist
In: the component will be laid out according to signal flow, it then follows first protect the principle of post filtering.
4. high-grade carrying out surge protection as described in claim 1 and the design of the ethernet interface circuit of high EMI performance, feature exist
In: network transformer primary and secondary circuit on the placement direction of PCB is isolated entirely from, network transformer PCB projection
Plane layer hollows out processing.
5. high-grade carrying out surge protection as described in claim 1 and the design of the ethernet interface circuit of high EMI performance, feature exist
All become close to network in the diode of: each Transient Suppression Diode, gas-discharge tube, filter capacitor, two stages of circuit
The interface of depressor is arranged.
6. high-grade carrying out surge protection as described in claim 1 and the design of the ethernet interface circuit of high EMI performance, feature exist
In: signal wire TX+, TX- (RX+, RX-) should be routed with difference form balanced, symmetrical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811561286.5A CN109347081A (en) | 2018-12-19 | 2018-12-19 | A kind of high-grade carrying out surge protection and the design of the ethernet interface circuit of high EMI performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811561286.5A CN109347081A (en) | 2018-12-19 | 2018-12-19 | A kind of high-grade carrying out surge protection and the design of the ethernet interface circuit of high EMI performance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109347081A true CN109347081A (en) | 2019-02-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811561286.5A Pending CN109347081A (en) | 2018-12-19 | 2018-12-19 | A kind of high-grade carrying out surge protection and the design of the ethernet interface circuit of high EMI performance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109347081A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112019039A (en) * | 2020-08-28 | 2020-12-01 | 广州广电计量检测股份有限公司 | Power interface circuit with high-grade surge protection and high EMI performance |
| CN114362114A (en) * | 2021-12-13 | 2022-04-15 | 裕太微电子股份有限公司 | Interface surge protection circuit of Ethernet physical layer chip |
| 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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|---|---|---|---|---|
| CN201830274U (en) * | 2010-03-03 | 2011-05-11 | 武汉迈威光电技术有限公司 | Ethernet interface circuit integrated module with surge protection function |
| CN102593816A (en) * | 2012-03-06 | 2012-07-18 | 深圳市海鹏信电子股份有限公司 | Surge protection device of gigabit active Ethernet |
| CN205753397U (en) * | 2016-05-24 | 2016-11-30 | 深圳市赛盛技术股份有限公司 | A kind of Ethernet interface protection filter design circuit |
| CN107611957A (en) * | 2017-09-30 | 2018-01-19 | 深圳市艾特智能科技有限公司 | Surging protection circuit and power supply unit |
-
2018
- 2018-12-19 CN CN201811561286.5A patent/CN109347081A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201830274U (en) * | 2010-03-03 | 2011-05-11 | 武汉迈威光电技术有限公司 | Ethernet interface circuit integrated module with surge protection function |
| CN102593816A (en) * | 2012-03-06 | 2012-07-18 | 深圳市海鹏信电子股份有限公司 | Surge protection device of gigabit active Ethernet |
| CN205753397U (en) * | 2016-05-24 | 2016-11-30 | 深圳市赛盛技术股份有限公司 | A kind of Ethernet interface protection filter design circuit |
| CN107611957A (en) * | 2017-09-30 | 2018-01-19 | 深圳市艾特智能科技有限公司 | Surging protection circuit and power supply unit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112019039A (en) * | 2020-08-28 | 2020-12-01 | 广州广电计量检测股份有限公司 | Power interface circuit with high-grade surge protection and high EMI performance |
| CN114362114A (en) * | 2021-12-13 | 2022-04-15 | 裕太微电子股份有限公司 | Interface surge protection circuit of Ethernet physical layer chip |
| 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: 20190215 |
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| RJ01 | Rejection of invention patent application after publication |