CN104934957A - POE switch lightning protection circuit - Google Patents
POE switch lightning protection circuit Download PDFInfo
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- CN104934957A CN104934957A CN201510402323.8A CN201510402323A CN104934957A CN 104934957 A CN104934957 A CN 104934957A CN 201510402323 A CN201510402323 A CN 201510402323A CN 104934957 A CN104934957 A CN 104934957A
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Abstract
The invention provides a POE switch lightning protection circuit. First stage common mode protection is arranged between an Ethernet transformer and an Ethernet interface. A second protection module is arranged between the Ethernet transformer and an Ethernet PHY chip. A third protection module is arranged at an Ethernet power supply control chip. Lightning protection of a POE switch is effectively realized. A sensitive circuit of the Ethernet PHY is protected. And when the circuit is protected, signal transmission quality of the switch is not influenced.
Description
Technical field
The present invention relates to switch field, particularly relate to a kind of POE switch lightning protection circuit.
Background technology
Along with popularizing of network technology, POE (Power Over Ethernet, the power supply technique based on ethernet line) switch device is generally applied in video monitoring.In actual use, because 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, be easy to damage PoE switch device, 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, and the residual voltage of generation is higher, reliably can not protect sensitive circuit below.Between holding wire, powerful TVS pipe junction capacitance in parallel is also comparatively large, affects signal quality.
Summary of the invention
The shortcoming of prior art in view of the above; the object of the present invention is to provide a kind of POE switch lightning protection circuit, for solving in prior art the problem can not protected the PHY sensitive circuit of switch reliably and affect signal quality while protection switch.
For achieving the above object and other relevant objects, the invention provides a kind of POE switch lightning protection circuit, comprising: Ethernet transformer, Ethernet interface, ethernet PHY chip and Power over Ethernet control chip; Described switch lightning protection circuit also comprises: the first protection module, is connected between described Ethernet transformer and described Ethernet interface, in order to carry out the protection of first order common mode to described circuit; Second protection module, is connected between described Ethernet transformer and described ethernet PHY chip, in order to carry out second level common and different mode protection to described circuit; 3rd protection module, is arranged at described Power over Ethernet control chip, and is electrically connected with the first protection module, in order to carry out the protection of third level common and different mode to described circuit.
Optionally, described first protection module comprises TVS discharge tube.
Optionally, described first protection module also comprises a TVS discharge tube TVS1 and the 2nd TVS discharge tube TVS2, the described pin 1 of a TVS discharge tube TVS1 is electrically connected with the output of one end of resistance R1 and described Ethernet transformer, the other end of described resistance R1 is electrically connected with one end of electric capacity C1, the other end ground connection of described electric capacity C1, the described pin 3 of a TVS discharge tube TVS1 is electrically connected with the output of one end of resistance R2 and described Ethernet transformer, the other end of described resistance R2 is electrically connected with one end of electric capacity C2, the other end of described electric capacity C2 and pin 2 ground connection of a described TVS discharge tube TVS1, the described pin 1 of the 2nd TVS discharge tube TVS2 is electrically connected with the output of one end of resistance R3 and described Ethernet transformer, the other end of described resistance R3 is electrically connected with one end of electric capacity C3, the other end ground connection of described electric capacity C3, the described pin 3 of the 2nd TVS discharge tube TVS2 is electrically connected with the output of one end of resistance R4 and described Ethernet transformer, the other end of described resistance R4 is electrically connected with one end of electric capacity C4, the other end of described electric capacity C4 and pin 2 ground connection of a described TVS discharge tube TVS2.
Optionally, described second protection module comprises TVS pipe array.
Optionally, described second protection module also comprises a TVS array tube TVS3 and the 2nd TVS array tube TVS4, the described pin 1 of a TVS array tube TVS3 is electrically connected with the input of the pin TRD3-of described ethernet PHY chip and described Ethernet transformer, the pin 2 of a described TVS array tube TVS3 is connected to ground, the described pin 3 of a TVS array tube TVS3 is electrically connected with the input of the pin TRD3+ of described ethernet PHY chip and described Ethernet transformer, the described pin 4 of a TVS array tube TVS3 is electrically connected with the input of the pin TRD2+ of described ethernet PHY chip and described Ethernet transformer, the pin 5 of a described TVS array tube TVS3 connects+3.3V power supply, the described pin 6 of a TVS array tube TVS3 is electrically connected with the input of the pin TRD2-of described ethernet PHY chip and described Ethernet transformer, the described pin 1 of the 2nd TVS array tube TVS4 is electrically connected with the input of the pin TRD1-of described ethernet PHY chip and described Ethernet transformer, the pin 2 of described 2nd TVS array tube TVS4 is connected to ground, the described pin 3 of the 2nd TVS array tube TVS4 is electrically connected with the input of the pin TRD1+ of described ethernet PHY chip and described Ethernet transformer, the described pin 4 of the 2nd TVS array tube TVS4 is electrically connected with the input of the pin TRD0+ of described ethernet PHY chip and described Ethernet transformer, the pin 5 of described 2nd TVS array tube TVS4 connects+3.3V power supply, the described pin 6 of the 2nd TVS array tube TVS4 is electrically connected with the input of the pin TRD0-of described ethernet PHY chip and described Ethernet transformer.
Optionally, described 3rd protection module comprises TVS pipe and Schottky diode.
Optionally; described 3rd protection module comprises the TVS pipe TVS5 that anode is connected to ground, negative electrode is connected with anode and the+48V power supply of cache switching diodes D1; also comprise Schottky diode D2 and D3; the negative electrode of described Schottky diode D2 is electrically connected with the output of the anode of described cache switching diodes D1 and described Ethernet transformer; the negative electrode of described Schottky diode D3 is electrically connected with the anode of described Schottky diode D2, and the anode of described Schottky diode D3 is connected to ground.
Optionally, described Ethernet interface is the one in RJ45 interface, RJ11 interface, SC optical fiber interface, fddi interface, AUI interface, bnc interface and Console interface.
As mentioned above; a kind of POE switch lightning protection circuit of the present invention; by arranging the protection of first order common mode between Ethernet transformer and Ethernet interface; between Ethernet transformer and ethernet PHY chip, the second protection module is set; and the 3rd protection module is set at Power over Ethernet control chip place; effective realization is to the lightning protection of POE switch; more can protect the sensitive circuit of ethernet PHY; and while circuit is protected, the signal transmission quality of switch can not be affected.
Accompanying drawing explanation
Fig. 1 is shown as a kind of POE switch lightning protection circuit of the present invention structural representation in one embodiment.
Fig. 2 is shown as a kind of POE switch lightning protection circuit of the present invention structural representation in one embodiment.
Element numbers explanation
1 POE switch lightning protection circuit
11 Ethernet transformers
12 Ethernet interfaces
13 ethernet PHY chips
14 and Power over Ethernet control chip
15 first protection modules
16 second protection modules
17 the 3rd protection modules
Embodiment
By particular specific embodiment, embodiments of the present invention are described below, person skilled in the art scholar the content disclosed by this specification can understand other advantages of the present invention and effect easily.
Refer to Fig. 1 to Fig. 2.Notice, structure, ratio, size etc. that this specification institute accompanying drawings illustrates, content all only in order to coordinate specification to disclose, understand for person skilled in the art scholar and read, and be not used to limit the enforceable qualifications of the present invention, therefore the not technical essential meaning of tool, the adjustment of the modification of any structure, the change of proportionate relationship or size, do not affecting under effect that the present invention can produce and the object that can reach, still all should drop on disclosed technology contents and obtain in the scope that can contain.Simultaneously, quote in this specification as " on ", D score, "left", "right", " centre " and " one " etc. term, also only for ease of understanding of describing, and be not used to limit the enforceable scope of the present invention, the change of its relativeness or adjustment, under changing technology contents without essence, when being also considered as the enforceable category of the present invention.
Refer to Fig. 1, be shown as a kind of POE switch lightning protection circuit of the present invention structural representation in one embodiment, described POE switch lightning protection circuit 1 comprises: Ethernet transformer 11, Ethernet interface 12, ethernet PHY chip 13 and Power over Ethernet control chip 14; In concrete enforcement, described Ethernet interface 12 is the one in the interfaces such as RJ45 interface, RJ11 interface, SC optical fiber interface, fddi interface, AUI interface, bnc interface and Console.
Described switch lightning protection circuit 1 also comprises: the first protection module 15, second protection module 16 and the 3rd protection module 17.
Described first protection module 15 is connected between described Ethernet transformer 11 and described Ethernet interface 12, and in order to carry out the protection of first order common mode to described circuit 1, preferably, described first protection module comprises TVS discharge tube.Concrete refers to Fig. 2, and wherein, described Ethernet interface is RJ45 interface.Described first protection module 15 also comprises a TVS discharge tube TVS1 and the 2nd TVS discharge tube TVS2, the described pin 1 of a TVS discharge tube TVS1 is electrically connected with the output of one end of resistance R1 and described Ethernet transformer, the other end of described resistance R1 is electrically connected with one end of electric capacity C1, the other end ground connection of described electric capacity C1, the described pin 3 of a TVS discharge tube TVS1 is electrically connected with the output of one end of resistance R2 and described Ethernet transformer, the other end of described resistance R2 is electrically connected with one end of electric capacity C2, the other end of described electric capacity C2 and pin 2 ground connection of a described TVS discharge tube TVS1, the described pin 1 of the 2nd TVS discharge tube TVS2 is electrically connected with the output of one end of resistance R3 and described Ethernet transformer, the other end of described resistance R3 is electrically connected with one end of electric capacity C3, the other end ground connection of described electric capacity C3, the described pin 3 of the 2nd TVS discharge tube TVS2 is electrically connected with the output of one end of resistance R4 and described Ethernet transformer, the other end of described resistance R4 is electrically connected with one end of electric capacity C4, the other end of described electric capacity C4 and pin 2 ground connection of a described TVS discharge tube TVS2.Wherein, the model of a described TVS discharge tube TVS1 and described 2nd TVS discharge tube TVS2 is BV-SMCT-30CA.
Described second protection module 16 is connected between described Ethernet transformer 11 and described ethernet PHY 13 chip, and in order to carry out second level common and different mode protection to described circuit 1, preferably, described second protection module comprises TVS pipe array.Concrete refers to Fig. 2, described second protection module also comprises a TVS array tube TVS3 and the 2nd TVS array tube TVS4, the described pin 1 of a TVS array tube TVS3 is electrically connected with the input of the pin TRD3-of described ethernet PHY chip and described Ethernet transformer, the pin 2 of a described TVS array tube TVS3 is connected to ground, the described pin 3 of a TVS array tube TVS3 is electrically connected with the input of the pin TRD3+ of described ethernet PHY chip and described Ethernet transformer, the described pin 4 of a TVS array tube TVS3 is electrically connected with the input of the pin TRD2+ of described ethernet PHY chip and described Ethernet transformer, the pin 5 of a described TVS array tube TVS3 connects+3.3V power supply, the described pin 6 of a TVS array tube TVS3 is electrically connected with the input of the pin TRD2-of described ethernet PHY chip and described Ethernet transformer, the described pin 1 of the 2nd TVS array tube TVS4 is electrically connected with the input of the pin TRD1-of described ethernet PHY chip and described Ethernet transformer, the pin 2 of described 2nd TVS array tube TVS4 is connected to ground, the described pin 3 of the 2nd TVS array tube TVS4 is electrically connected with the input of the pin TRD1+ of described ethernet PHY chip and described Ethernet transformer, the described pin 4 of the 2nd TVS array tube TVS4 is electrically connected with the input of the pin TRD0+ of described ethernet PHY chip and described Ethernet transformer, the pin 5 of described 2nd TVS array tube TVS4 connects+3.3V power supply, the described pin 6 of the 2nd TVS array tube TVS4 is electrically connected with the input of the pin TRD0-of described ethernet PHY chip and described Ethernet transformer.Wherein, the model of a described TVS array tube TVS3 and described 2nd TVS array tube TVS4 is WE05-4RVLC.
Described 3rd protection module 17 is arranged at described Power over Ethernet control chip; and be electrically connected with described first protection module 15; in order to carry out the protection of third level common and different mode to described circuit, preferably, described 3rd protection module comprises TVS pipe and Schottky diode.Concrete refers to Fig. 2, described 3rd protection module comprises anode and is connected to ground, the TVS pipe TVS5 that negative electrode is connected with anode and the+48V power supply of cache switching diodes D1, also comprise Schottky diode D2 and D3, the negative electrode of described Schottky diode D2 and the anode of described cache switching diodes D1, the output of described Ethernet transformer, and the pin 3 of described 2nd TVS discharge tube TVS2 is electrically connected, the negative electrode of described Schottky diode D3 is electrically connected with the pin 1 of the anode of described Schottky diode D2 and described 2nd TVS discharge tube TVS2, and the anode of described Schottky diode D3 is connected to ground.
Operation principle embodiment illustrated in fig. 2 is: in the actual application environment of PoE switch, and 4 are mainly common mode surge to the thunder and lightning that the netting twine be intertwined senses.The common mode energy of induction is entered from RJ45 port by netting twine, and this energy suppresses TVS pipe TVS1 and TVS2 and centre tapped RC (R1, C1 by flowing through the common mode protection device transient voltage be connected in parallel in Ethernet transformer center tap; R2, C2; R3, C3; R4, C4 form) dissipate to the earth.Small part is delivered to differential mode and the common mode event of Ethernet transformer drive end; to dissipate on protection device TVS3 and TV4; this energy is entered by the steering diode of protection device inside; and flow through two paths: one by internal clamping diodes TVS to GND, simultaneously voltage clamp at predeterminated level.Another achieves differential mode and common mode to the protection of ethernet PHY reliably by power supply VCC to GND, protection device TVS3 and TVS4; Small part is delivered to differential mode and the common mode event of PoE control module end; protection device TVS1 will be flowed through; TVS5 and Schottky diode D2, D3 dissipate to the earth, and these protection devices also reliably protect the supply lines of connection POE port with the destruction making POE control module exempt from surge current.Wherein, the model of described Schottky diode D2, D3 is MBRS1100T3.
In sum; a kind of POE switch lightning protection circuit of the present invention; by arranging the protection of first order common mode between Ethernet transformer and Ethernet interface; between Ethernet transformer and ethernet PHY chip, the second protection module is set; and the 3rd protection module is set at Power over Ethernet control chip place; effective realization is to the lightning protection of POE switch; more can protect the sensitive circuit of ethernet PHY; and while circuit is protected, the signal transmission quality of switch can not be affected.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (8)
1. a POE switch lightning protection circuit, is characterized in that, comprising: Ethernet transformer, Ethernet interface, ethernet PHY chip and Power over Ethernet control chip; Described switch lightning protection circuit also comprises:
First protection module, is connected between described Ethernet transformer and described Ethernet interface, in order to carry out the protection of first order common mode to described circuit;
Second protection module, is connected between described Ethernet transformer and described ethernet PHY chip, in order to carry out second level common and different mode protection to described circuit;
3rd protection module, is arranged at described Power over Ethernet control chip, and is electrically connected with the first protection module, in order to carry out the protection of third level common and different mode to described circuit.
2. switch lightning protection circuit according to claim 1, is characterized in that: described first protection module comprises TVS discharge tube.
3. switch lightning protection circuit according to claim 2, it is characterized in that: described first protection module also comprises a TVS discharge tube TVS1 and the 2nd TVS discharge tube TVS2, the described pin 1 of a TVS discharge tube TVS1 is electrically connected with the output of one end of resistance R1 and described Ethernet transformer, the other end of described resistance R1 is electrically connected with one end of electric capacity C1, the other end ground connection of described electric capacity C1, the described pin 3 of a TVS discharge tube TVS1 is electrically connected with the output of one end of resistance R2 and described Ethernet transformer, the other end of described resistance R2 is electrically connected with one end of electric capacity C2, the other end of described electric capacity C2 and pin 2 ground connection of a described TVS discharge tube TVS1, the described pin 1 of the 2nd TVS discharge tube TVS2 is electrically connected with the output of one end of resistance R3 and described Ethernet transformer, the other end of described resistance R3 is electrically connected with one end of electric capacity C3, the other end ground connection of described electric capacity C3, the described pin 3 of the 2nd TVS discharge tube TVS2 is electrically connected with the output of one end of resistance R4 and described Ethernet transformer, the other end of described resistance R4 is electrically connected with one end of electric capacity C4, the other end of described electric capacity C4 and pin 2 ground connection of a described TVS discharge tube TVS2.
4. switch lightning protection circuit according to claim 1, is characterized in that: described second protection module comprises TVS pipe array.
5. switch lightning protection circuit according to claim 4, it is characterized in that: described second protection module also comprises a TVS array tube TVS3 and the 2nd TVS array tube TVS4, the described pin 1 of a TVS array tube TVS3 is electrically connected with the input of the pin TRD3-of described ethernet PHY chip and described Ethernet transformer, the pin 2 of a described TVS array tube TVS3 is connected to ground, the described pin 3 of a TVS array tube TVS3 is electrically connected with the input of the pin TRD3+ of described ethernet PHY chip and described Ethernet transformer, the described pin 4 of a TVS array tube TVS3 is electrically connected with the input of the pin TRD2+ of described ethernet PHY chip and described Ethernet transformer, the pin 5 of a described TVS array tube TVS3 connects+3.3V power supply, the described pin 6 of a TVS array tube TVS3 is electrically connected with the input of the pin TRD2-of described ethernet PHY chip and described Ethernet transformer, the described pin 1 of the 2nd TVS array tube TVS4 is electrically connected with the input of the pin TRD1-of described ethernet PHY chip and described Ethernet transformer, the pin 2 of described 2nd TVS array tube TVS4 is connected to ground, the described pin 3 of the 2nd TVS array tube TVS4 is electrically connected with the input of the pin TRD1+ of described ethernet PHY chip and described Ethernet transformer, the described pin 4 of the 2nd TVS array tube TVS4 is electrically connected with the input of the pin TRD0+ of described ethernet PHY chip and described Ethernet transformer, the pin 5 of described 2nd TVS array tube TVS4 connects+3.3V power supply, the described pin 6 of the 2nd TVS array tube TVS4 is electrically connected with the input of the pin TRD0-of described ethernet PHY chip and described Ethernet transformer.
6. switch lightning protection circuit according to claim 1, is characterized in that: described 3rd protection module comprises TVS pipe and Schottky diode.
7. switch lightning protection circuit according to claim 6, it is characterized in that, described 3rd protection module comprises anode and is connected to ground, the TVS pipe TVS5 that negative electrode is connected with anode and the+48V power supply of cache switching diodes D1, also comprise Schottky diode D2 and D3, the negative electrode of described Schottky diode D2 is electrically connected with the output of the anode of described cache switching diodes D1 and described Ethernet transformer, the negative electrode of described Schottky diode D3 is electrically connected with the anode of described Schottky diode D2, and the anode of described Schottky diode D3 is connected to ground.
8. switch lightning protection circuit according to claim 1, is characterized in that: described Ethernet interface is the one in RJ45 interface, RJ11 interface, SC optical fiber interface, fddi interface, AUI interface, bnc interface and Console interface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510402323.8A CN104934957A (en) | 2015-07-10 | 2015-07-10 | POE switch lightning protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510402323.8A CN104934957A (en) | 2015-07-10 | 2015-07-10 | POE switch lightning protection circuit |
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| CN104934957A true CN104934957A (en) | 2015-09-23 |
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| CN201510402323.8A Pending CN104934957A (en) | 2015-07-10 | 2015-07-10 | POE switch lightning protection circuit |
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| CN106532625A (en) * | 2016-11-30 | 2017-03-22 | 深圳市泛海三江科技发展有限公司 | Protection circuit module for network cable power supply channel, power supply channel, power supply equipment and power supply system |
| CN109274083A (en) * | 2018-10-08 | 2019-01-25 | 深圳市三旺通信技术有限公司 | A kind of POE interface surge protection circuit |
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Application publication date: 20150923 |
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| RJ01 | Rejection of invention patent application after publication |