CN204361680U - A kind of lightning protection circuit - Google Patents
A kind of lightning protection circuit Download PDFInfo
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- CN204361680U CN204361680U CN201520099852.0U CN201520099852U CN204361680U CN 204361680 U CN204361680 U CN 204361680U CN 201520099852 U CN201520099852 U CN 201520099852U CN 204361680 U CN204361680 U CN 204361680U
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- lightning protection
- common mode
- protection component
- transmission line
- pair
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Abstract
The utility model discloses a kind of lightning protection circuit, comprising: the first common mode lightning protection component, the second common mode lightning protection component and rectifier bridge, wherein, the conducting voltage of the first common mode lightning protection component and the second common mode lightning protection component is lower than predeterminated voltage; The corresponding rectifier bridge of often pair of transmission line in Power over Ethernet scene, two transmission lines in often pair of transmission line connect two inputs of corresponding rectifier bridge respectively; For the positive output end of rectifier bridge corresponding to often pair of transmission line of connecting valve positive source by the first common mode lightning protection component ground connection, negative output terminal is by the second common mode lightning protection component ground connection; For the positive output end of rectifier bridge corresponding to often pair of transmission line of connecting valve power cathode by the second common mode lightning protection component ground connection, negative output terminal is by the first common mode lightning protection component ground connection.Adopt the scheme that the utility model provides, protection effect is better.
Description
Technical field
The utility model relates to electronic technology field, particularly relates to a kind of lightning protection circuit.
Background technology
Power over Ethernet (Power Over Ethernet, POE) refer to when existing Ethernet wiring architecture does not make any changes, while for some communication products transmission data, the technology of direct current supply can also be carried out for these communication products.
When Power over Ethernet is applied to outdoor communication product, being easy to the interference being subject to thunder and lightning, for ensureing system reliability, needing the higher lightning protection circuit of degree of protection is installed.A kind of common lightning protection circuit be applied in Power over Ethernet scene is shown in Fig. 1, protection at different levels adds two pole gas discharge tube GDT9 all over the ground, and due to the characteristic of gas discharge tube, its conducting voltage is higher, clamp voltage is higher over the ground to cause transmission line, and protection effect is poor.
Utility model content
The utility model embodiment provides a kind of lightning protection circuit, in order to solve the problem that in prior art, lightning protection circuit protection effect is poor.
The utility model embodiment provides a kind of lightning protection circuit, be applied to Power over Ethernet scene, described Power over Ethernet scene comprises at least one pair of transmission line for connecting valve positive source and at least one pair of transmission line for connecting valve power cathode, described lightning protection circuit comprises the first common mode lightning protection component, the second common mode lightning protection component and rectifier bridge, wherein, the conducting voltage of described first common mode lightning protection component and described second common mode lightning protection component lower than predeterminated voltage, the corresponding rectifier bridge of the often pair of transmission line in described Power over Ethernet scene;
Two transmission lines in often pair of transmission line in described Power over Ethernet scene, connect two inputs of corresponding rectifier bridge respectively;
For the positive output end of rectifier bridge corresponding to often pair of transmission line of connecting valve positive source by described first common mode lightning protection component ground connection, negative output terminal is by described second common mode lightning protection component ground connection;
For the positive output end of rectifier bridge corresponding to often pair of transmission line of connecting valve power cathode by described second common mode lightning protection component ground connection, negative output terminal is by described first common mode lightning protection component ground connection.
The lightning protection circuit that the utility model embodiment provides, in Power over Ethernet scene, for the positive output end of rectifier bridge corresponding to often pair of transmission line of connecting valve positive source, and for the negative output terminal of rectifier bridge corresponding to often pair of transmission line of connecting valve power cathode, the the first common mode lightning protection component adding conducting voltage all over the ground less protects, for the negative output terminal of rectifier bridge corresponding to often pair of transmission line of connecting valve positive source, and for the positive output end of rectifier bridge corresponding to often pair of transmission line of connecting valve power cathode, the the second common mode lightning protection component adding conducting voltage all over the ground less protects, therefore, it is possible to reduce transmission line clamp voltage over the ground, protection effect is better.
Accompanying drawing explanation
Accompanying drawing is used to provide further understanding of the present utility model, and forms a part for specification, is used from explanation the utility model with the utility model embodiment one, does not form restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the structural representation of lightning protection circuit in prior art;
One of structural representation of the lightning protection circuit that Fig. 2 provides for the utility model embodiment;
The structural representation two of the lightning protection circuit that Fig. 3 provides for the utility model embodiment;
The structural representation three of the lightning protection circuit that Fig. 4 provides for the utility model embodiment.
Embodiment
In order to provide the implementation improving protection effect, the utility model embodiment provides a kind of lightning protection circuit, below in conjunction with Figure of description, preferred embodiment of the present utility model is described, be to be understood that, preferred embodiment described herein only for instruction and explanation of the utility model, and is not used in restriction the utility model.And when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
The utility model embodiment provides a kind of lightning protection circuit being applied to Power over Ethernet scene, Power over Ethernet scene comprises at least one pair of transmission line for connecting valve positive source and at least one pair of transmission line for connecting valve power cathode, this lightning protection circuit comprises the first common mode lightning protection component, the second common mode lightning protection component and rectifier bridge, wherein, the conducting voltage of the first common mode lightning protection component and the second common mode lightning protection component lower than predeterminated voltage, the corresponding rectifier bridge of the often pair of transmission line in Power over Ethernet scene;
Two transmission lines in often pair of transmission line in Power over Ethernet scene, connect two inputs of corresponding rectifier bridge respectively;
For the positive output end of rectifier bridge corresponding to often pair of transmission line of connecting valve positive source by the first common mode lightning protection component ground connection, negative output terminal is by the second common mode lightning protection component ground connection; For the positive output end of rectifier bridge corresponding to often pair of transmission line of connecting valve power cathode by the second common mode lightning protection component ground connection, negative output terminal is by the first common mode lightning protection component ground connection.
It should be noted that, in the lightning protection circuit that the utility model embodiment provides, the quantity that the quantity of rectifier bridge is right with transmission line is identical, and is relation one to one.
And for the concrete quantity of the first common mode lightning protection component and the second common mode lightning protection component, the utility model does not limit, and can be one, also can be multiple; For the positive output end of rectifier bridge corresponding to often pair of transmission line of connecting valve positive source, and for the negative output terminal of rectifier bridge corresponding to often pair of transmission line of connecting valve power cathode, by the concrete mode of the first common mode lightning protection component ground connection, the utility model does not also limit; For the negative output terminal of rectifier bridge corresponding to often pair of transmission line of connecting valve positive source, and for the positive output end of rectifier bridge corresponding to often pair of transmission line of connecting valve power cathode, by the concrete mode of the second common mode lightning protection component ground connection, the utility model does not also limit.
For the first common mode lightning protection component, in a specific embodiment, a first common mode lightning protection component only can be comprised in above-mentioned lightning protection circuit, for the positive output end of rectifier bridge corresponding to each pair of transmission line of connecting valve positive source, and for the negative output terminal of rectifier bridge corresponding to each pair of transmission line of connecting valve power cathode all by this first common mode lightning protection component ground connection.
In another specific embodiment, two the first common mode lightning protection components can be comprised in above-mentioned lightning protection circuit, for the positive output end of rectifier bridge corresponding to each pair of transmission line of connecting valve positive source by a first common mode lightning protection component ground connection, for the negative output terminal of rectifier bridge corresponding to each pair of transmission line of connecting valve power cathode by another the first common mode lightning protection component ground connection.
Certainly, in another specific embodiment, also more first common mode lightning protection component can be comprised in above-mentioned lightning protection circuit, for the positive output end of rectifier bridge corresponding to each pair of transmission line of connecting valve positive source, and for the negative output terminal of rectifier bridge corresponding to each pair of transmission line of connecting valve power cathode, respectively by a first common mode lightning protection component ground connection.
During actual enforcement, the concrete quantity of the first common mode lightning protection component can be determined according to practical application scene, and the concrete mode of ground connection.Equally, during actual enforcement, the concrete quantity of the second common mode lightning protection component also can be determined according to practical application scene, and the concrete mode of ground connection.
Further, above-mentioned first common mode lightning protection component and the second common mode lightning protection component select conducting voltage lower than the lightning protection component of predeterminated voltage, in the utility model embodiment, this predeterminated voltage is less than the conducting voltage of two pole gas discharge tubes, when the conducting voltage of the first common mode lightning protection component and the second common mode lightning protection component is less, transmission line over the ground clamp voltage is also lower, and protection effect is better.
In the utility model embodiment, the first common mode lightning protection component is specifically as follows transient voltage suppressor diode, can certainly be other lightning protection component, as piezo-resistance etc.; Second common mode lightning protection component is specifically as follows semiconductor discharge tube, can certainly be other lightning protection component, as transient voltage suppressor diode, piezo-resistance etc.
In prior art, Ethernet transmission line has eight, and it is four right to be defined as: transmission line 1,2 is a pair, and transmission line 3,6 is a pair, transmission line 4,5 is a pair, and transmission line 7,8 is a pair; For realizing Power over Ethernet, the positive pole of usual application transport line 3,6 or transmission line 4,5 connecting valve power supply 48V at present, the negative pole of application transport line 1,2 or transmission line 7,8 connecting valve power supply 48V.Namely transmission line 3,6 and transmission line 4,5 are the transmission line for connecting valve positive source in Power over Ethernet scene; Transmission line 1,2 and transmission line 7,8 are the transmission line for connecting valve power cathode in Power over Ethernet scene.
Now, the lightning protection circuit that the utility model embodiment provides specifically can be as shown in Figure 2, above-mentioned first common mode lightning protection component is specially transient voltage suppressor diode, second common mode lightning protection component is specially semiconductor discharge tube, lightning protection circuit specifically comprises two transient voltage suppressor diode TVS1, TVS2, two semiconductor discharge tube TSS1, TSS2 and four rectifier bridge HD1 ~ HD4, first rectifier bridge HD1 is mounted on transmission line 3 by two inputs, on 6, second rectifier bridge HD2 is mounted on transmission line 4 by two inputs, on 5, 3rd rectifier bridge HD3 is mounted on transmission line 1 by two inputs, on 2, 4th rectifier bridge HD4 is mounted on transmission line 7 by two inputs, on 8, the positive output end of the first rectifier bridge HD1 and the second rectifier bridge HD2 is by the first transient voltage suppressor diode TVS1 ground connection, and negative output terminal is by the first semiconductor discharge tube TSS1 ground connection, the positive output end of the 3rd rectifier bridge HD3 and the 4th rectifier bridge HD4 is by the second semiconductor discharge tube TSS2 ground connection, and negative output terminal is by the second transient voltage suppressor diode TVS2 ground connection.
Preferably, in order to ensure differential mode protection effect, in above-mentioned lightning protection circuit, differential mode lightning protection component can also be comprised; One end of differential mode lightning protection component connects the positive output end for rectifier bridge corresponding to often pair of transmission line of connecting valve positive source, and the other end connects the negative output terminal for rectifier bridge corresponding to often pair of transmission line of connecting valve power cathode.
Further, above-mentioned differential mode lightning protection component can be, but not limited to as transient voltage suppressor diode.Transient voltage suppressor diode is only an example, and is not used in restriction the utility model.
Lightning protection circuit shown in Fig. 3 is and adds a transient voltage suppressor diode TVS3 more on the lightning protection circuit basis shown in Fig. 2, can ensure the differential mode protection effect between Switching Power Supply positive pole and Switching Power Supply negative pole.
Preferably, in order to reduce distributed capacitance, the guarantee data transmission quality in circuit, above-mentioned lightning protection circuit can also comprise multiple additional device, and the distributed capacitance of this additional device is less than predetermined capacitive; Two transmission lines in often pair of transmission line in described Power over Ethernet scene, connect two inputs of corresponding rectifier bridge respectively by an additional device.Namely by sealing in the less device of distributed capacitance in the line, the object reducing circuit integrity distributed capacitance is reached.
In the utility model embodiment, additional device is specifically as follows semiconductor discharge tube, can certainly be that other distributed capacitance is little, two-way admittance and the large device of through-current capacity, as anti-paralleled diode etc.
Lightning protection circuit shown in Fig. 4 is and adds semiconductor discharge tube TSS01 ~ TSS08 more on the lightning protection circuit basis shown in Fig. 3, and compared to the lightning protection circuit shown in Fig. 3, distributed capacitance reduces greatly.
In sum, adopt the lightning protection circuit that the utility model embodiment provides, common mode protection effect, differential mode protection effect are all better, and data transmission quality is higher.
Obviously, those skilled in the art can carry out various change and modification to the utility model and not depart from spirit and scope of the present utility model.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model is also intended to comprise these change and modification.
Claims (7)
1. a lightning protection circuit, be applied to Power over Ethernet scene, described Power over Ethernet scene comprises at least one pair of transmission line for connecting valve positive source and at least one pair of transmission line for connecting valve power cathode, it is characterized in that, described lightning protection circuit comprises the first common mode lightning protection component, the second common mode lightning protection component and rectifier bridge, wherein, the conducting voltage of described first common mode lightning protection component and described second common mode lightning protection component lower than predeterminated voltage, the corresponding rectifier bridge of the often pair of transmission line in described Power over Ethernet scene;
Two transmission lines in often pair of transmission line in described Power over Ethernet scene, connect two inputs of corresponding rectifier bridge respectively;
For the positive output end of rectifier bridge corresponding to often pair of transmission line of connecting valve positive source by described first common mode lightning protection component ground connection, negative output terminal is by described second common mode lightning protection component ground connection;
For the positive output end of rectifier bridge corresponding to often pair of transmission line of connecting valve power cathode by described second common mode lightning protection component ground connection, negative output terminal is by described first common mode lightning protection component ground connection.
2. lightning protection circuit as claimed in claim 1, it is characterized in that, described first common mode lightning protection component, is specially transient voltage suppressor diode.
3. lightning protection circuit as claimed in claim 1, it is characterized in that, described second common mode lightning protection component, is specially semiconductor discharge tube.
4. the lightning protection circuit as described in as arbitrary in claim 1-3, is characterized in that, also comprise differential mode lightning protection component;
One end of described differential mode lightning protection component connects the positive output end for rectifier bridge corresponding to often pair of transmission line of connecting valve positive source, and the other end connects the negative output terminal for rectifier bridge corresponding to often pair of transmission line of connecting valve power cathode.
5. lightning protection circuit as claimed in claim 4, it is characterized in that, described differential mode lightning protection component, is specially transient voltage suppressor diode.
6. lightning protection circuit as claimed in claim 1, it is characterized in that, also comprise multiple additional device, the distributed capacitance of described additional device is less than predetermined capacitive;
Two transmission lines in often pair of transmission line in described Power over Ethernet scene, connect two inputs of corresponding rectifier bridge respectively by an additional device.
7. lightning protection circuit as claimed in claim 6, it is characterized in that, described additional device is specially semiconductor discharge tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520099852.0U CN204361680U (en) | 2015-02-11 | 2015-02-11 | A kind of lightning protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520099852.0U CN204361680U (en) | 2015-02-11 | 2015-02-11 | A kind of lightning protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204361680U true CN204361680U (en) | 2015-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520099852.0U Expired - Fee Related CN204361680U (en) | 2015-02-11 | 2015-02-11 | A kind of lightning protection circuit |
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| CN (1) | CN204361680U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11764569B2 (en) | 2019-07-02 | 2023-09-19 | Zhejiang Dahua Technology Co., Ltd. | Electrical surge protection circuits |
-
2015
- 2015-02-11 CN CN201520099852.0U patent/CN204361680U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11764569B2 (en) | 2019-07-02 | 2023-09-19 | Zhejiang Dahua Technology Co., Ltd. | Electrical surge protection circuits |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150527 Termination date: 20210211 |
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| CF01 | Termination of patent right due to non-payment of annual fee |