CN202749806U

CN202749806U - Ethernet shunt transition and other-circuit power supply overvoltage protector

Info

Publication number: CN202749806U
Application number: CN 201120559391
Authority: CN
Inventors: 赵福江
Original assignee: SHENZHEN TECHWIN LIGHTNING TECHNOLOGIES CO Ltd
Current assignee: SHENZHEN TECHWIN LIGHTNING TECHNOLOGIES CO Ltd
Priority date: 2011-12-28
Filing date: 2011-12-28
Publication date: 2013-02-20
Anticipated expiration: 2021-12-28

Abstract

The utility model provides an Ethernet shunt transition and other-circuit power supply overvoltage protector which comprises a signal and power supply input interface, a signal output interface, a network signal branch and a power supply branch. The network signal branch comprises the following circuits in series connection along a direction from the signal and power supply input interface to the signal output interface: a pre-stage parallel protection circuit, a rectification clamp circuit, a decoupling circuit and a post-stage protection circuit, wherein the rectification clamp circuit is composed of rectifier bridges BR1 to BR4, a transient voltage suppression diode T1 and high voltage fast recovery diodes D1 to D4 and has a signal output terminal and a power supply output terminal. The power supply branch comprises a POE inspection response circuit, a DC/DC switching circuit, a commercial power supply and switching circuit, a power supply selection circuit and a power supply output interface. According to the utility model, through cooperation between a high voltage fast recovery diode set and TVS, problems caused by excessively great TVS junction capacitance are effectively compensated; and the pre-stage parallel protection circuit guarantees that follow current and thermal trip of lines do not occur and prevents short-circuit between the lines and common lines.

Description

Ethernet shunt transition and other road power supply overvoltage protector

Technical field

The utility model relates to ethernet signal lightning protection and power supply over-voltage protection technology field, relates in particular to a kind of Ethernet shunt transition and other road power supply overvoltage protector.

Background technology

Popularizing, developing along with modern electronic technology, information technology; especially along with birth and the development of new electronic component; the high speed development of electric power and information industry; the network equipment of the industries such as electric power, railway, oil, communication, airport, national defence, finance also presents high speed development trend to the demand of meticulous lightning protection component; especially in message transmitting procedure; siganl thunder-proof device is also had higher requirement simultaneously, and protective capability is strong, possess power delivery ability etc. possesses equal importance with signal transmission characteristics.

At present, that adopts in the industry is generally 10/100Mbps adaptive network siganl thunder-proof device, only protects 1/2,3/6 line, and the TVS(transient voltage twin zener dioder that the rear class protection circuit adopts) because junction capacitance is excessive, very large to the decay of signal; Existing gigabit Ethernet overvoltage protector circuit is too simple and crude, does not reach due protective effect; In addition, existing POE (Power Over Ethernet) Power over Ethernet circuit can only take out the 48V power supply from switch and supply with terminal equipment, and can not supply with the voltage of demanding terminal; And many terminal equipments do not possess response switch POE investigation function.

The utility model content

The utility model embodiment technical problem to be solved is, a kind of Ethernet shunt transition and other road power supply overvoltage protector is provided, and with the enhancing signal reliability, and can provide POE investigation response function and conversion electric power Voltage-output.

For solving the problems of the technologies described above, the utility model provides following technical scheme: a kind of Ethernet shunt transition and other road power supply overvoltage protector comprise be used to the signal that obtains the outside signal of inputting and power supply and power input interface, are used for signal output interface, network signal branch road and power branch to external output signal;

Described network signal branch road two ends connect respectively described signal and power input interface and signal output interface, and it comprises the following circuit of connecting successively from signal and power input interface to signal output interface direction:

Prime protection circuit in parallel is used for releasing thunder and lightning and electromagnetic pulse;

The rectification clamp circuit, be used for guaranteeing that the voltage difference of each voltage between lines is in permissible range, described rectification clamp circuit is by the first rectifier bridge BR1, the second rectifier bridge BR2, the 3rd rectifier bridge BR3, the 4th rectifier bridge BR4, transient voltage suppressor diode T1 and the first high pressure fast recovery diode D1, the second high pressure fast recovery diode D2, third high is pressed fast recovery diode D3, the 4th high pressure fast recovery diode D4 forms, wherein, the 1st of first to fourth rectifier bridge BR1-BR4,3 ends are connected to respectively the 1st line and the 2nd line of circuit, the 3rd line and the 6th line, the 4th line and the 5th line, the 8th line and the 7th line, the 2nd end of first to fourth rectifier bridge BR1-BR4 all connects the negative pole of the first high pressure fast recovery diode D1 and also all connects the positive pole that third high is pressed fast recovery diode D3 negative pole and the 4th high pressure fast recovery diode D4 by transient voltage suppressor diode T1, the plus earth of the first high pressure fast recovery diode D1, the 4th end of first to fourth rectifier bridge BR1-BR4 all connects the positive pole of the second high pressure fast recovery diode D2, third high is pressed the positive pole of fast recovery diode D3 and the negative pole of the 4th high pressure fast recovery diode D4, the second high pressure fast recovery diode D2 minus earth, described rectification clamp circuit has signal output part and power output end;

Decoupling circuit is connected in the signal output part of described rectification clamp circuit, is used for suppressor pulse and time-delay is provided; And

The rear class protection circuit is used for further guaranteeing pressure reduction between line;

Described power branch comprises:

POE investigates response circuit, is connected in the power output end of described rectification clamp circuit;

The DC/DC change-over circuit is serially connected with described POE investigation response circuit output and converts the required magnitude of voltage of terminal to the DC power supply of POE being investigated the response circuit acquisition;

Commercial power supply and change-over circuit obtain alternating current and are converted to DC power supply from electricity network;

Power selection circuit is used for selecting one road power supply as the DC power supply of output from DC/DC change-over circuit and commercial power supply and change-over circuit; And

Power output interface, the DC power supply that links to each other and select circuit to select with out-put supply with power selection circuit.

Further, described prime protection circuit in parallel is made of the first discharge tube G1, the second discharge tube G2, the 3rd discharge tube G3, the 4th discharge tube G4 and the first piezo-resistance RV1, the second piezo-resistance RV2, the 3rd piezo-resistance RV3, the 4th piezo-resistance RV4, the 6th piezo-resistance RV6, the 7th piezo-resistance RV7, the 9th piezo-resistance RV9 and the tenth piezo-resistance RV10, wherein, the first piezo-resistance RV1 and an end ground connection after the second piezo-resistance RV2 is in parallel, the other end is by the 1st line and the 2nd line of the first discharge tube G1 connection line; An end ground connection after the 3rd piezo-resistance RV3, the 4th piezo-resistance RV4 parallel connection, the other end is by the 3rd line and the 6th line of the second discharge tube G2 connection line; An end ground connection after the 6th piezo-resistance RV6, the 7th piezo-resistance RV7 parallel connection, the other end connects the 4th line and the 5th line by the 3rd discharge tube G3; An end ground connection after the 9th piezo-resistance RV9, the tenth piezo-resistance RV10 parallel connection, the other end is by the 7th line and the 8th line of the 4th discharge tube G4 connection line.

Further, described decoupling circuit is comprised of the first to eight resistance R 1-R8 or PTC thermistor in the 1-8 line that is serially connected with respectively circuit.

Further, the rear class protection circuit is comprised of the array chip U1 in the 1st line that is serially connected with circuit, the 2nd line, the 3rd line and the 6th line and the array chip U2 that is serially connected with in the 4th line, the 5th line, the 7th line and the 8th line of circuit.

Further, described POE investigation response circuit is by a Mosfet chip Q2, the first voltage stabilizing didoe D8, the second voltage stabilizing didoe D9 and the 11 resistance R 11, the 12 resistance R 12, the 13 resistance R 13 consists of, wherein, the first voltage stabilizing didoe D8 and the 12 resistance R 12 rear and the 13 resistance R 13 in parallel, the second voltage stabilizing didoe D9 connects successively, one end of the 13 resistance R 13 connects the negative pole of the first voltage stabilizing didoe D8 and the other end connects the positive pole of the second voltage stabilizing didoe D9, the first voltage stabilizing didoe D8 and an end that is connected the 13 resistance R 13 of the 12 resistance R 12 doublets also connect the grid G of a Mosfet chip Q2, the other end also is connected in the source S of a Mosfet chip Q2, the source S of the one Mosfet chip Q2 also connects the positive pole of the first voltage stabilizing didoe D2, and the two ends of the 11 resistance R 11 connect respectively positive pole and the second voltage stabilizing didoe D9 negative pole of the first voltage stabilizing didoe D2, and the drain D of a Mosfet chip Q2 links to each other with the DC/DC change-over circuit respectively with the negative pole of the second voltage stabilizing didoe D9.

Further, described DC/DC change-over circuit is made of DC/DC module U3 and peripheral circuit thereof.

Further, described DC/DC module U3 comprises:

Connect that the 21 resistance R 21, an end that SD end and the other end connect the VIN end connect the SD end and electricity the 22 resistance R22 of other end ground connection, be connected in the first capacitor C 1 between VIN end and the earth terminal, the second capacitor C 2 and ten two capacitor C 12 in parallel with the 22 resistance R 22 forms input filter and start-up circuit by an end;

Select feedback circuit by the output voltage that chip IC, the 25 resistance R 25, the 26 resistance R 26, the 24 resistance R 24 and the 5th capacitor C 5, the 6th capacitor C 6 consist of, wherein, the 24 resistance R 24 is in parallel with the 6th capacitor C 6 again with the concatermer of capacitor C 5, the series parallel structure that forms is connected between the COMP pin, FB pin of chip IC again, and the 25 resistance R 25 is connected between the FB pin and VOUT of chip IC, and the 26 resistance R 26 is connected between the FB pin and earth terminal of chip IC;

By chip IC and be connected respectively inside concussion and the filter circuit that the 3rd capacitor C 3, the 4th capacitor C 4, the 8th capacitor C 8, the 23 resistance R 23 between the RAMP of chip IC pin, SS pin, VCC pin, RT pin and earth terminal consist of; And

By chip IC and the 3rd voltage stabilizing didoe D10, the 9th inductance L 9, the 27 resistance R 27, the 7th capacitor C 7, the 11 capacitor C 11, the 9th capacitor C 9, the voltage follower circuit that the tenth capacitor C 10 consists of, wherein, the 3rd voltage stabilizing didoe D10 and the 11 capacitor C 11, be connected between the IS pin and earth terminal of chip IC after 27 series connection of the 27 resistance R, the anodal IS pin that connects chip IC of the 3rd voltage stabilizing didoe D10, the 9th inductance L 9 is connected between the SW pin and VOUT end of chip IC, the 7th capacitor C 7 one ends connect the BST pin of chip IC, the other end connects on the circuit and the circuit between the 9th inductance L 9 and the SW pin between the 3rd voltage stabilizing didoe D10 and the 11 capacitor C 11, and the 9th capacitor C 9, the tenth capacitor C 10 is connected between VOUT end and the earth terminal.

Further, described peripheral circuit is comprised of the 7th diode D7, the first inductance L 1, the second inductance L 2, the 3rd inductance L 3, the 4th inductance L 4, the end anodal and the second inductance L 2 of described the 7th diode D7 all is connected to the output of POE investigation response circuit, and the 7th diode D7 negative pole connects an end of the first inductance L 1, the other end of the first inductance L 1, the second inductance L 2 all links to each other with DC/DC module U3 input, and the output of DC/DC module U3 links to each other with power output interface via the 3rd inductance L 3, the 4th inductance L 4 respectively.

Further, described commercial power supply and change-over circuit are made of civil power input interface, civil power lightning protection circuit and the AC/DC change-over circuit of successively series connection.

Further, described power selection circuit is by the 2nd Mosfet chip U5, the 5th diode D5, the 6th diode D6, the first triode Q1, the 4th triode Q4 and the 9th resistance R 9, the tenth resistance R 10, the 14 resistance R 14, the 15 resistance R 15, the 16 resistance R 16, the 17 resistance R 17 and the 18 resistance R 18 form, wherein, the grounded emitter of the first triode Q1, the base stage of the first triode Q1 is by the 9th resistance R 9 ground connection, and passing through the output that the tenth resistance R 10 connects commercial power supplies and change-over circuit, the collector electrode of the first triode Q1 connects DC/DC change-over circuit outputs and passes through the base stage that the 14 resistance R 14 connects the 4th triode Q4 by the 16 resistance R 16; The grounded emitter of the 4th triode Q4, the 4th triode Q4 base stage are also by the 15 resistance R 15 ground connection, and the collector electrode of the 4th triode Q4 connects the grid G of the 2nd Mosfet chip U5 by the 18 resistance R 18; The source S of the 2nd Mosfet chip U5 also is connected in DC/DC change-over circuit output, the grid of the 2nd Mosfet chip U5 also connects DC/DC change-over circuit output by the 17 resistance R 17, the drain D of the 2nd Mosfet chip U5 connects the positive pole of the 5th diode D5, the negative pole of the 5th diode D5 connects power output interface, the positive pole of the 6th diode D6 connects the output of commercial power supply and change-over circuit, and negative pole connects power output interface.

By adopting technique scheme, the utility model has following beneficial effect at least: the high pressure fast recovery diode group that high pressure resistant by having, the low economize on electricity of the utility model is held cooperates with TVS, can effectively remedy the excessive problem of bringing of TVS junction capacitance; And discharge tube has guaranteed that with the prime protection circuit in parallel that piezo-resistance forms circuit without afterflow and heat dropout, prevents that circuit is to public short-circuit between conductors; The advantages such as the utility model also has operating state simple in structure, easy to identify and failure state, anti-lightning and thunder and lightning electric pulse ability is strong, residual voltage is low, DC/DC, the AC/DC power supply conversion efficiency is high, work is sensitive reliably, low cost of manufacture.The utility model can satisfy the protective circuit of the supply of demanding terminal power supply and gigabit Ethernet transmission simultaneously.

Description of drawings

Fig. 1 is the control principle block diagram of the utility model protector.

Fig. 2 is the circuit theory diagrams of the utility model protector.

Fig. 3 is the DC/DC modular circuit schematic diagram of the utility model protector.

Fig. 4 is the AC/DC modular circuit schematic diagram of the utility model protector.

Embodiment

Please refer to an embodiment of the present utility model of Figure 1 and Figure 2; the utility model provides a kind of Ethernet shunt transition and other road power supply overvoltage protector, comprising: signal and power input interface, signal output interface, network signal branch road and power branch.

More than in each assembly, described signal and power input interface are used for obtaining signal and the power supply of outside input, as shown in Figure 1, usually adopt the RJ45 interface.

And described network signal branch road two ends connect respectively described signal and power input interface and signal output interface, comprise the following circuit of connecting successively from signal and power input interface to signal output interface direction: prime protection circuit in parallel, rectification clamp circuit, decoupling circuit, rear class protection circuit; And described power branch comprises: POE investigation response circuit, DC/DC change-over circuit, commercial power supply and change-over circuit, power selection circuit and power output interface.

Described prime protection circuit one end in parallel is connected in described signal and power input interface, it is as first order protective unit, also be signal and power channel master protective unit simultaneously, be used for releasing thunder and lightning and electromagnetic pulse, in the specific implementation, described prime protection circuit in parallel is by first to fourth discharge tube G1-G4 and the first piezo-resistance RV1, the second piezo-resistance RV2, the 3rd piezo-resistance RV3, the 4th piezo-resistance RV4, the 6th piezo-resistance RV6, the 7th piezo-resistance RV7, the 9th piezo-resistance RV9, the tenth piezo-resistance RV10 connection in series-parallel consists of, can guarantee that circuit is without afterflow and heat dropout, prevent circuit to public short-circuit between conductors, guaranteed simultaneously passage between common wire without afterflow.

Described rectification clamp circuit is as second level protective unit, and it is serially connected with prime protection circuit output in parallel, and the voltage difference that is used for guaranteeing each voltage between lines plays simultaneously the rectification clamping action and reduces junction capacitance in permissible range.During implementation, described rectification clamp circuit is by the first rectifier bridge BR1, the second rectifier bridge BR2, the 3rd rectifier bridge BR3, the 4th rectifier bridge BR4, transient voltage suppressor diode T1 and the first high pressure fast recovery diode D1, the second high pressure fast recovery diode D2, third high is pressed fast recovery diode D3, the bridge rectifier clamp circuit that the 4th high pressure fast recovery diode D4 forms, wherein, the 1st of first to fourth rectifier bridge BR1-BR4,3 ends are connected to respectively the 1st line and the 2nd line of circuit, the 3rd line and the 6th line, the 4th line and the 5th line, the 8th line and the 7th line, the 2nd end of first to fourth rectifier bridge BR1-BR4 all connects the negative pole of the first high pressure fast recovery diode D1 and also all connects the positive pole that third high is pressed fast recovery diode D3 negative pole and the 4th high pressure fast recovery diode D4 by transient voltage suppressor diode T1, the plus earth of the first high pressure fast recovery diode D1, the 4th end of first to fourth rectifier bridge BR1-BR4 all connects the positive pole of the second high pressure fast recovery diode D2, third high is pressed the positive pole of fast recovery diode D3 and the negative pole of the 4th high pressure fast recovery diode D4, the second high pressure fast recovery diode D2 minus earth, described rectification clamp circuit has signal output part and power output end.

Described decoupling circuit is serially connected with described rectification clamp circuit signal output part, during implementation, described decoupling circuit is made of the first to eight resistance R 1-R8 in each line of 1-8 that is serially connected with circuit, it is as third level protective unit, be used for suppressor pulse and time-delay is provided, guarantee that second level protection circuit makes first order circuit operation before not breakdown.

Described rear class protection circuit is serially connected with the decoupling circuit output, is used for further guaranteeing pressure reduction between line.During implementation, described rear class protection circuit is comprised of the array chip U1 in the 1st line that is serially connected with circuit, the 2nd line, the 3rd line, the 6th line and the array chip U2 that is serially connected with in the 4th line, the 5th line, the 7th line, the 8th line.

Described signal output interface is serially connected with rear class protection circuit output, is used for to external output signal.

Described POE investigation response circuit is serially connected with described rectification clamp circuit power output end, described POE investigation response circuit is made of a Mosfet chip Q2, the first voltage stabilizing didoe D8, the second voltage stabilizing didoe D9 and the 11 resistance R 11, scholar's two resistance R 12 and the 13 resistance R 13, plays POE investigation response function.

Described DC/DC change-over circuit is serially connected with described POE investigation response circuit output, described DC/DC change-over circuit comprises DC/DC module U3 and peripheral circuit, is used for that POE is investigated the power supply that response circuit obtains from the rectification clamp circuit and converts the required magnitude of voltage of terminal to.

As shown in Figure 3, described DC/DC module U3 includes again:

Connect that the 21 resistance R 21, an end that SD end and the other end connect the VIN end connect the SD end and the 22 resistance R 22 of other end ground connection, be connected in the first capacitor C 1 between VIN end and the earth terminal, the second capacitor C 2 and ten two capacitor C 12 in parallel with the 22 resistance R 22 forms input filter and start-up circuit by an end;

Select feedback circuit by the output voltage that chip IC, the 25 resistance R 25, the 26 resistance R 26, the 24 resistance R 24 and the 5th capacitor C 5, the 6th capacitor C 6 consist of, wherein, the 24 resistance R 24 is in parallel with the 6th capacitor C 6 again with the concatermer of the 5th capacitor C 5, the series parallel structure that forms is connected between the COMP pin, FB pin of chip IC again, and the 25 resistance R 25 is connected between the FB pin and VOUT of chip IC, and the 26 resistance R 6 is connected between the FB pin and earth terminal of chip IC;

During work, DC/DC module U3 is by the inner functions such as finishing current limliting, short-circuit protection and heat protection that detects of chip IC.

Described peripheral circuit is comprised of the 7th diode D7, the first inductance L 1, the second inductance L 2, the 3rd inductance L 3, the 4th inductance L 4, the end anodal and the second inductance L 2 of described the 7th diode D7 all is connected to the output of POE investigation response circuit, and the 7th diode D7 negative pole connects an end of the first inductance L 1, the other end of the first inductance L 1, the second inductance L 2 all links to each other with DC/DC module U3 input, and the output of DC/DC module U3 links to each other with power output interface via the 3rd inductance L 3, the 4th inductance L 4 respectively.

Described commercial power supply and change-over circuit are composed in series successively by civil power input interface, civil power lightning protection circuit and AC/DC change-over circuit.Wherein, the civil power input interface offers subsequent conversion for being connected to obtain alternating current with electricity network; And described civil power lightning protection circuit is comprised of the 11 piezo-resistance RV11, the 12 piezo-resistance RV12, the 13 piezo-resistance RV13 and the 14 piezo-resistance RV14, the first temperature safety tube F1, the second temperature safety tube F2 and the 7th inductance L 7, the 8th inductance L 8; Described AC/DC change-over circuit is used for and will be converted to direct current from the alternating current that electricity network obtains, it can directly adopt existing various common ac-dc converter circuit, as shown in Figure 2, described AC/DC change-over circuit is made of AC/DC module U4 and the 5th inductance L 5, the 6th inductance L 6, described AC/DC module U4 can adopt universal industrial level power supply module, in embodiment as shown in Figure 4, described AC/DC module U4 is comprised of electromagnetic interface filter, rectifier bridge, conversion transformer, control chip IC and voltage reference circuit thereof.

Because the utility model protector is in running, can produce two-way can be for the DC power supply of output, that is: the one tunnel is from POE investigation response circuit from the Ethernet acquisition and the DC power supply of changing through the DC/DC change-over circuit, another road is the DC power supply that obtains and be converted to through the AC/DC change-over circuit from electricity network, effectively manage and control for ease of exporting for power supply, and be provided with power selection circuit, be used for selecting the output of one tunnel DC power supply from above-mentioned two-way DC power supply, described power selection circuit is by the 2nd Mosfet chip U5, the 5th diode D5, the 6th diode D6, the first triode Q1, the 4th triode Q4 and the 9th resistance R 9, the tenth resistance R 10, the 14 resistance R 14, the 15 resistance R 15, the 16 resistance R 16, the 17 resistance R 17, the 18 resistance R 18 forms, wherein, the grounded emitter of the first triode Q1, the base stage of the first triode Q1 is by the 9th resistance R 9 ground connection, and passing through the output that the tenth resistance R 10 connects commercial power supplies and change-over circuit, the collector electrode of the first triode Q1 connects DC/DC change-over circuit outputs and passes through the base stage that the 14 resistance R 14 connects the 4th triode Q4 by the 16 resistance R 16; The grounded emitter of the 4th triode Q4, the 4th triode Q4 base stage are also by the 15 resistance R 15 ground connection, and the collector electrode of the 4th triode Q4 connects the grid G of the 2nd Mosfet chip U5 by the 18 resistance R 18; The source S of the 2nd Mosfet chip U5 also is connected in DC/DC change-over circuit output, the grid of the 2nd Mosfet chip U5 also connects DC/DC change-over circuit output by the 17 resistance R 17, the drain D of the 2nd Mosfet chip U5 connects the positive pole of the 5th diode D5, the negative pole of the 5th diode D5 connects power output interface, the positive pole of the 6th diode D6 connects the output of commercial power supply and change-over circuit, and negative pole connects power output interface.

And described power output interface links to each other with power selection circuit with output by the selected DC power supply of power selection circuit.

The PE line of each circuit of this protector must link to each other with earth mat.

The utility model protector is when work, and the rectification clamp circuit outputs to POE investigation response circuit by rectifier bridge, responds and takes out 48V, 13W power supply by switch after POE investigates, and changes the Voltage-output of demanding terminal after the DC/DC circuit conversion into.Commercial power supply and change-over circuit also produce the Voltage-output that meets demanding terminal.Two kinds of power supplys that meet demanding terminal are exported by power output interface after via power selection circuit, usually, the power supply that the preferred commercial power supply of meeting and change-over circuit output are come is exported the power supply that POE investigation response circuit is come through the output of DC/DC change-over circuit again without this power supply.

Claims

An Ethernet shunt transition and other road the power supply overvoltage protector, comprise be used to signal and the power input interface of the signal that obtains outside input and power supply and be used for signal output interface to external output signal, it is characterized in that described protector also comprises network signal branch road and power branch;

Described network signal branch road two ends connect respectively described signal and power input interface and signal output interface, and it comprises the following circuit of connecting successively from signal and power input interface to signal output interface direction:

Prime protection circuit in parallel is used for releasing thunder and lightning and electromagnetic pulse;

The rectification clamp circuit, be used for guaranteeing that the voltage difference of each voltage between lines is in permissible range, described rectification clamp circuit is by the first rectifier bridge BR1, the second rectifier bridge BR2, the 3rd rectifier bridge BR3, the 4th rectifier bridge BR4, transient voltage suppressor diode T1 and the first high pressure fast recovery diode D1, the second high pressure fast recovery diode D2, third high is pressed fast recovery diode D3, the 4th high pressure fast recovery diode D4 forms, wherein, the 1st of first to fourth rectifier bridge BR1-BR4,3 ends are connected to respectively the 1st line and the 2nd line of circuit, the 3rd line of circuit and the 6th line, the 4th line of circuit and the 5th line, the 8th line of circuit and the 7th line, the 2nd end of first to fourth rectifier bridge BR1-BR4 all connects the negative pole of the first high pressure fast recovery diode D1 and also all connects the positive pole that third high is pressed fast recovery diode D3 negative pole and the 4th high pressure fast recovery diode D4 by transient voltage suppressor diode T1, the plus earth of the first high pressure fast recovery diode D1, the 4th end of first to fourth rectifier bridge BR1-BR4 all connects the positive pole of the second high pressure fast recovery diode D2, third high is pressed the positive pole of fast recovery diode D3 and the negative pole of the 4th high pressure fast recovery diode D4, the second high pressure fast recovery diode D2 minus earth, described rectification clamp circuit has signal output part and power output end;

Decoupling circuit is connected in the signal output part of described rectification clamp circuit, is used for suppressor pulse and time-delay is provided; And

The rear class protection circuit is used for further guaranteeing pressure reduction between line;

Described power branch comprises:

POE investigates response circuit, is connected in the power output end of described rectification clamp circuit;

The DC/DC change-over circuit is serially connected with described POE investigation response circuit output and converts the required magnitude of voltage of terminal to the DC power supply of POE being investigated the response circuit acquisition;

Commercial power supply and change-over circuit obtain alternating current and are converted to DC power supply from electricity network;

Power selection circuit is used for selecting one road power supply as the DC power supply of output from DC/DC change-over circuit and commercial power supply and change-over circuit; And

Power output interface, the DC power supply that links to each other and select circuit to select with out-put supply with power selection circuit.
Ethernet shunt transition as claimed in claim 1 and other road the power supply overvoltage protector, it is characterized in that, described prime protection circuit in parallel is by the first discharge tube G1, the second discharge tube G2, the 3rd discharge tube G3, the 4th discharge tube G4 and the first piezo-resistance RV1, the second piezo-resistance RV2, the 3rd piezo-resistance RV3, the 4th piezo-resistance RV4, the 6th piezo-resistance RV6, the 7th piezo-resistance RV7, the 9th piezo-resistance RV9 and the tenth piezo-resistance RV10 consist of, wherein, the first piezo-resistance RV1 and an end ground connection after the second piezo-resistance RV2 is in parallel, the other end is by the 1st line and the 2nd line of the first discharge tube G1 connection line; An end ground connection after the 3rd piezo-resistance RV3, the 4th piezo-resistance RV4 parallel connection, the other end is by the 3rd line and the 6th line of the second discharge tube G2 connection line; An end ground connection after the 6th piezo-resistance RV6, the 7th piezo-resistance RV7 parallel connection, the other end is by the 4th line and the 5th line of the 3rd discharge tube G3 connection line; An end ground connection after the 9th piezo-resistance RV9, the tenth piezo-resistance RV10 parallel connection, the other end is by the 7th line and the 8th line of the 4th discharge tube G4 connection line.
3. Ethernet shunt transition as claimed in claim 1 and other road power supply overvoltage protector is characterized in that described decoupling circuit is comprised of the first to eight resistance R 1-R8 or the PTC thermistor in the 1-8 line that is serially connected with respectively circuit.
Ethernet shunt transition as claimed in claim 1 and other road the power supply overvoltage protector; it is characterized in that the rear class protection circuit is comprised of the array chip U1 in the 1st line that is serially connected with circuit, the 2nd line, the 3rd line and the 6th line and the array chip U2 that is serially connected with in the 4th line, the 5th line, the 7th line and the 8th line of circuit.
Ethernet shunt transition as claimed in claim 1 and other road the power supply overvoltage protector; it is characterized in that; described POE investigation response circuit is by a Mosfet chip Q2; the first voltage stabilizing didoe D8; the second voltage stabilizing didoe D9 and the 11 resistance R 11; the 12 resistance R 12; the 13 resistance R 13 consists of; wherein; the first voltage stabilizing didoe D8 and the 12 resistance R 12 rear and the 13 resistance R 13 in parallel; the second voltage stabilizing didoe D9 connects successively; one end of the 13 resistance R 13 connects the negative pole of the first voltage stabilizing didoe D8 and the other end connects the positive pole of the second voltage stabilizing didoe D9; the first voltage stabilizing didoe D8 and an end that is connected the 13 resistance R 13 of the 12 resistance R 12 doublets also connect the grid G of a Mosfet chip Q2; the other end also is connected in the source S of a Mosfet chip Q2; the source S of the one Mosfet chip Q2 also connects the positive pole of the second high pressure fast recovery diode D2; and the two ends of the 11 resistance R 11 connect respectively positive pole and the second voltage stabilizing didoe D9 negative pole of the second high pressure fast recovery diode D2, and the drain D of a Mosfet chip Q2 links to each other with the DC/DC change-over circuit respectively with the negative pole of the second voltage stabilizing didoe D9.
6. Ethernet shunt transition as claimed in claim 1 and other road power supply overvoltage protector is characterized in that described DC/DC change-over circuit is made of DC/DC module U3 and peripheral circuit thereof.
Ethernet shunt transition as claimed in claim 6 and other road the power supply overvoltage protector, it is characterized in that described DC/DC module U3 comprises:

Connect that the 21 resistance R 21, an end that SD end and the other end connect the VIN end connect the SD end and the 22 resistance R 22 of other end ground connection, be connected in the first capacitor C 1 between VIN end and the earth terminal and the second capacitor C 2 and ten two capacitor C 12 in parallel with the 22 resistance R 22 forms input filter and start-up circuit by an end;

Select feedback circuit by the output voltage that chip IC, the 25 resistance R 25, the 26 resistance R 26, the 24 resistance R 24 and the 5th capacitor C 5, the 6th capacitor C 6 consist of, wherein, the 24 resistance R 24 is in parallel with the 6th capacitor C 6 again with the concatermer of the 5th capacitor C 5, the series parallel structure that forms is connected between the COMP pin, FB pin of chip IC again, and the 25 resistance R 25 is connected between the FB pin and VOUT of chip IC, and the 26 resistance R 26 is connected between the FB pin and earth terminal of chip IC;

By chip IC and be connected respectively inside concussion and the filter circuit that the 3rd capacitor C 3, the 4th capacitor C 4, the 8th capacitor C 8, the 23 resistance R 23 between the RAMP of chip IC pin, SS pin, VCC pin, RT pin and earth terminal consist of; And

By chip IC and the 3rd voltage stabilizing didoe D10, the 9th inductance L 9, the 27 resistance R 27, the 7th capacitor C 7, the 11 capacitor C 11, the 9th capacitor C 9, the voltage follower circuit that the tenth capacitor C 10 consists of, wherein, the 3rd voltage stabilizing didoe D10 and the 11 capacitor C 11, be connected between the IS pin and earth terminal of chip IC after 27 series connection of the 27 resistance R, the anodal IS pin that connects chip IC of the 3rd voltage stabilizing didoe D10, the 9th inductance L 9 is connected between the SW pin and VOUT end of chip IC, the 7th capacitor C 7 one ends connect the BST pin of chip IC, the other end connects on the circuit and the circuit between the 9th inductance L 9 and the SW pin between the 3rd voltage stabilizing didoe D10 and the 11 capacitor C 11, and the 9th capacitor C 9, the tenth capacitor C 10 is connected between VOUT end and the earth terminal.
Ethernet shunt transition as claimed in claim 6 and other road the power supply overvoltage protector; it is characterized in that; described peripheral circuit is by the 7th diode D7; the first inductance L 1; the second inductance L 2; the 3rd inductance L 3; the 4th inductance L 4 forms; the end anodal and the second inductance L 2 of described the 7th diode D7 all is connected to the output of POE investigation response circuit; and the 7th diode D7 negative pole connects an end of the first inductance L 1; the first inductance L 1; the other end of the second inductance L 2 all links to each other with DC/DC module U3 input, and the output of DC/DC module U3 is respectively via the 3rd inductance L 3; the 4th inductance L 4 links to each other with power output interface.
9. Ethernet shunt transition as claimed in claim 1 and other road power supply overvoltage protector is characterized in that, described commercial power supply and change-over circuit are made of civil power input interface, civil power lightning protection circuit and the AC/DC change-over circuit of successively series connection.
The Ethernet shunt transition of requirement as claimed in claim 1 and other road the power supply overvoltage protector, it is characterized in that, described power selection circuit is by the 2nd Mosfet chip U5, the 5th diode D5, the 6th diode D6, the first triode Q1, the 4th triode Q4 and the 9th resistance R 9, the tenth resistance R 10, the 14 resistance R 14, the 15 resistance R 15, the 16 resistance R 16, the 17 resistance R 17, the 18 resistance R 18 forms, wherein, the grounded emitter of the first triode Q1, the base stage of the first triode Q1 is by the 9th resistance R 9 ground connection, and passing through the output that the tenth resistance R 10 connects commercial power supplies and change-over circuit, the collector electrode of the first triode Q1 connects DC/DC change-over circuit outputs and passes through the base stage that the 14 resistance R 14 connects the 4th triode Q4 by the 16 resistance R 16; The grounded emitter of the 4th triode Q4, the 4th triode Q4 base stage are also by the 15 resistance R 15 ground connection, and the collector electrode of the 4th triode Q4 connects the grid G of the 2nd Mosfet chip U5 by the 18 resistance R 18; The source S of the 2nd Mosfet chip U5 also is connected in DC/DC change-over circuit output, the grid of the 2nd Mosfet chip U5 also connects DC/DC change-over circuit output by the 17 resistance R 17, the drain D of the 2nd Mosfet chip U5 connects the positive pole of the 5th diode D5, the negative pole of the 5th diode D5 connects power output interface, the positive pole of the 6th diode D6 connects the output of commercial power supply and change-over circuit, and negative pole connects power output interface.