CN204290308U - A kind of lightning protection circuit - Google Patents
A kind of lightning protection circuit Download PDFInfo
- Publication number
- CN204290308U CN204290308U CN201420843186.2U CN201420843186U CN204290308U CN 204290308 U CN204290308 U CN 204290308U CN 201420843186 U CN201420843186 U CN 201420843186U CN 204290308 U CN204290308 U CN 204290308U
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- pin
- ethernet interface
- discharge tube
- electrically connected
- ceramic discharge
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Abstract
The utility model discloses a kind of lightning protection circuit, comprise Ethernet interface; Ethernet transformer, is electrically connected with described Ethernet interface; PHY chip, is electrically connected with described Ethernet transformer; Wherein, between described Ethernet interface and described Ethernet transformer, be also provided with ceramic discharge tube, to realize the protection of first order differential mode to described Ethernet interface; TVS pipe array is also provided with, to realize the second level protection of differential mode and common mode to described Ethernet interface between described Ethernet transformer and described PHY chip.The utility model provides reliable differential mode and common mode protection, effectively prevents thunder and lightning on the impact of the ethernet signal of transmission.
Description
Technical field
The utility model relates to a kind of protective circuit, particularly relates to a kind of lightning protection circuit.
Background technology
Along with popularizing of network technology, ethernet device is generally applied to huge numbers of families.In actual use, ethernet line is crisscross and extend to open air by indoor, so the electromagnetic pulse caused by thunder and lightning can respond to instantaneous overvoltage in ethernet line, is easy to damage equipment, in order to ensure the safe operation of equipment, safeguard procedures must be taked to Ethernet interface.
The technology that prior art is commonly used has following two kinds:
The first realizes high_voltage isolation by the Ethernet transformer at communication apparatus Ethernet interface place and common mode inhibition realizes overvoltage protection, and shortcoming reliably to protect sensitive circuit PHY below.
The second adopts three pole gas discharge tubes to carry out common mode overvoltage protection at the Ethernet interface place of communication apparatus, and TVS pipe in parallel is protected as differential mode.Its shortcoming is that the gas discharge tube response time is slow; the residual voltage produced is higher; reliably can not protect sensitive circuit below; moreover the shell of current home electronics and Ethernet interface RJ45 adopt the plastics of unmasked, so in fact three pole gas discharge tubes do not play common mode protective effect.
Utility model content
The purpose of this utility model is to provide a kind of lightning protection circuit, by providing reliable differential mode and common mode protection, effectively prevents thunder and lightning on the impact of the ethernet signal of transmission.
In order to achieve the above object, the utility model adopts following technical scheme:
A kind of lightning protection circuit, is applied in the lightning protection of Ethernet interface, comprises:
Ethernet interface;
Ethernet transformer, is electrically connected with described Ethernet interface;
PHY chip, is electrically connected with described Ethernet transformer;
Wherein, between described Ethernet interface and described Ethernet transformer, be also provided with ceramic discharge tube, to realize the protection of first order differential mode to described Ethernet interface; TVS pipe array is also provided with, to realize the second level protection of differential mode and common mode to described Ethernet interface between described Ethernet transformer and described PHY chip.
Above-mentioned a kind of lightning protection circuit, wherein, described ceramic discharge tube comprises the first ceramic discharge tube and the second ceramic discharge tube;
Described first ceramic discharge tube is electrically connected with the first pin of described Ethernet interface and the second pin respectively; described second ceramic discharge tube is electrically connected with the 3rd pin of described Ethernet interface and the 5th pin respectively, to realize the protection of first order differential mode to described Ethernet interface.
Above-mentioned a kind of lightning protection circuit; wherein; first pin of described TVS pipe array and the 6th pin are electrically connected with the TX+ pin of described PHY chip and TX-pin respectively, and the 3rd pin and the 4th pin are electrically connected with the RX+ pin of described PHY chip and RX-pin respectively.
Above-mentioned a kind of lightning protection circuit, wherein, described ceramic discharge tube is gas discharge tube.
Above-mentioned a kind of lightning protection circuit, wherein, described PHY chip transmission rate is 10/100M.
Adopt above technical scheme; following beneficial effect can be reached: by arranging ceramic discharge tube between Ethernet interface and Ethernet transformer; to form the protection of first order differential mode; TVS pipe array is set between Ethernet transformer and PHY chip; to form differential mode and the common mode protection of the second level, the common-mode signal because thunderbolt produces and difference mode signal can be eliminated.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of lightning protection circuit of the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but not as restriction of the present utility model.
As shown in Figure 1, a kind of lightning protection circuit, is applied in the lightning protection of Ethernet interface, comprises: Ethernet interface 5; Ethernet transformer 3, is electrically connected with Ethernet interface 5; PHY chip 1, is electrically connected with Ethernet transformer 3; Wherein, between Ethernet interface 5 and Ethernet transformer 3, be also provided with ceramic discharge tube 4, to realize the protection of first order differential mode to Ethernet interface 5; TVS pipe array 2 is also provided with, to realize the second level protection of differential mode and common mode to Ethernet interface 5 between Ethernet transformer 3 and PHY chip 1.
Operation principle of the present utility model is: when after generation thunder-strike phenomenon, Ethernet interface 5 can produce difference mode signal and common-mode signal.The utility model can be dissipated difference mode signal by ceramic discharge tube 4; Then by TVS pipe array 2 dissipate common-mode signal and differential mode good; And then form a stable network transmission signal, export PHY chip 1 to.By providing common mode protection circuit and differential mode protective circuit, the common-mode signal because thunderbolt produces and difference mode signal can be eliminated.
In a preferred embodiment, ceramic discharge tube 4 comprises the first ceramic discharge tube G1 and the second ceramic discharge tube G2; Concrete, first ceramic discharge tube G1 is electrically connected with the first pin of Ethernet interface 5 and the second pin respectively, second ceramic discharge tube G2 is electrically connected with the 3rd pin of described Ethernet interface 5 and the 5th pin respectively, to realize the protection of first order differential mode to Ethernet interface 5, now, difference mode signal is through the first ceramic discharge tube G1 and the second ceramic discharge tube G2, and dissipate major part, and residue small part is passed to Ethernet transformer 3; And common-mode signal dissipates seldom, major part is passed to Ethernet transformer 3, and owing to Ethernet transformer 3 being provided with tap and the then ground connection that connects with electric capacity C1, therefore, dissipated most common-mode signal, but has a small amount of common-mode signal residue.
In a preferred embodiment, the first pin of TVS pipe array 2 and the 6th pin are electrically connected with the TX+ pin of PHY chip 1 and TX-pin respectively, and the 3rd pin and the 4th pin are electrically connected with the RX+ pin of described PHY chip 1 and RX-pin respectively.TVS pipe array 2 provides differential mode to protect and common mode protection, and therefore, the remaining a small amount of common-mode signal of tap ground connection dissipation of the above-mentioned a small amount of difference mode signal and Ethernet transformer 3 that are passed to Ethernet transformer 3 dissipates through TVS pipe array 2.Concrete, above-mentioned differential mode and the control of common-mode signal in TVS array 2 enter to diode (D1, D2, D3, D4), and flow through two paths: one through being arranged on the clamp diode TVS ground connection in TVS array 2; Another is through external power source VCC or shunt capacitance C4 ground connection.
Except above-mentioned two kinds of protective circuits, the 4th pin of Ethernet interface 5 of the present utility model and the 6th pin short circuit, be then electrically connected with electric capacity C1 and ground connection, can dissipate a part of differential mode and common-mode signal; 7th pin of Ethernet interface 5 and the 8th pin short circuit, be then electrically connected with electric capacity C1 and ground connection, also can dissipate a part of differential mode and common-mode signal.
In a preferred embodiment, ceramic discharge tube 4 is gas discharge tube.
In a preferred embodiment, PHY chip 1 transmission rate is 10/100M.
The foregoing is only the utility model preferred embodiment; not thereby execution mode of the present utility model and protection range is limited; to those skilled in the art; should recognize and all should be included in the scheme that equivalent replacement done by all utilization the utility model specifications and diagramatic content and apparent change obtain in protection range of the present utility model.
Claims (5)
1. a lightning protection circuit, is applied in the lightning protection of Ethernet interface, it is characterized in that, described protective circuit comprises:
Ethernet interface;
Ethernet transformer, is electrically connected with described Ethernet interface;
PHY chip, is electrically connected with described Ethernet transformer;
Wherein, between described Ethernet interface and described Ethernet transformer, be also provided with ceramic discharge tube, to realize the protection of first order differential mode to described Ethernet interface; TVS pipe array is also provided with, to realize the second level protection of differential mode and common mode to described Ethernet interface between described Ethernet transformer and described PHY chip.
2. a kind of lightning protection circuit according to claim 1, is characterized in that: described ceramic discharge tube comprises the first ceramic discharge tube and the second ceramic discharge tube;
Described first ceramic discharge tube is electrically connected with the first pin of described Ethernet interface and the second pin respectively; described second ceramic discharge tube is electrically connected with the 3rd pin of described Ethernet interface and the 5th pin respectively, to realize the protection of first order differential mode to described Ethernet interface.
3. a kind of lightning protection circuit according to claim 1; it is characterized in that: the first pin of described TVS pipe array and the 6th pin are electrically connected with the TX+ pin of described PHY chip and TX-pin respectively, the 3rd pin and the 4th pin are electrically connected with the RX+ pin of described PHY chip and RX-pin respectively.
4. a kind of lightning protection circuit according to claim 2, is characterized in that: described ceramic discharge tube is gas discharge tube.
5. a kind of lightning protection circuit according to claim 1, is characterized in that: described PHY chip transmission rate is 10/100M.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420843186.2U CN204290308U (en) | 2014-12-22 | 2014-12-22 | A kind of lightning protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420843186.2U CN204290308U (en) | 2014-12-22 | 2014-12-22 | A kind of lightning protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204290308U true CN204290308U (en) | 2015-04-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420843186.2U Expired - Fee Related CN204290308U (en) | 2014-12-22 | 2014-12-22 | A kind of lightning protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204290308U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934957A (en) * | 2015-07-10 | 2015-09-23 | 上海斐讯数据通信技术有限公司 | POE switch lightning protection circuit |
| CN109473962A (en) * | 2018-12-13 | 2019-03-15 | 深圳市共进电子股份有限公司 | Network interface protection circuit and the network equipment |
| CN109672157A (en) * | 2018-12-21 | 2019-04-23 | 国网河南省电力公司焦作供电公司 | Communication port surge protection circuit |
-
2014
- 2014-12-22 CN CN201420843186.2U patent/CN204290308U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934957A (en) * | 2015-07-10 | 2015-09-23 | 上海斐讯数据通信技术有限公司 | POE switch lightning protection circuit |
| CN109473962A (en) * | 2018-12-13 | 2019-03-15 | 深圳市共进电子股份有限公司 | Network interface protection circuit and the network equipment |
| CN109672157A (en) * | 2018-12-21 | 2019-04-23 | 国网河南省电力公司焦作供电公司 | Communication port surge protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150422 Termination date: 20181222 |