CN207967933U - A kind of low residual voltage network interface protection circuit and device - Google Patents
A kind of low residual voltage network interface protection circuit and device Download PDFInfo
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- CN207967933U CN207967933U CN201820415728.4U CN201820415728U CN207967933U CN 207967933 U CN207967933 U CN 207967933U CN 201820415728 U CN201820415728 U CN 201820415728U CN 207967933 U CN207967933 U CN 207967933U
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Abstract
The utility model belongs to technical field of electronic equipment,Provide a kind of low residual voltage network interface protection circuit,The low residual voltage network interface protection circuit is connected between differential signal source and back-end network integrated circuit,The low residual voltage network interface protection circuit includes first order protection location,First order decoupling unit,Second level protection location and second level decoupling unit,Classification absorption is carried out to surge current by first order protection location and second level protection location two-stage protection circuit,And the parasitic couplings in circuit are eliminated using first order decoupling unit and second level decoupling unit and reduce surge voltage,So that the voltage that power output end output is stable,It ensure that the safety of back-end network integrated circuit,The utility model uses multistage combined protection,Under the premise of not influencing properties of product,Communication disruption caused by avoiding the factors such as lightning stroke,The problems such as crash and damage of product,And reduce later maintenance cost.
Description
Technical field
The utility model belongs to technical field of electronic equipment more particularly to a kind of low residual voltage network interface protection circuit and dress
It sets.
Background technology
Transmission mode one of of the circuit network interface as current most mainstream, at a distance transmission cause it normally answering
Had become normality by the interference of thunder and lightning and induced overvoltage in, thunder and lightning can make the system that various communication bus are constituted by
Serious damage, induced overvoltage interfere the data transmission quality for also drastically influencing communication bus.The protection of mainstream has at present
Two kinds, first, add lightning protection device in network interface front end, however lightning protection device is expensive, protection residual voltage is high and external influence product
It is beautiful；Second is that on printed circuit board (Printed Circuit Board, PCB) plus component is protected to form protection circuit, than
Such as network transformer prime or network transformer rear class add electrostatic impedor (Electro-Static discharge,
ESD single-stage protection circuit) uses gas-discharge tube (Gas Discharge Tube, GDT) or surge in primary common mode
Voltage suppressor (Thyristor Surge Suppressor, TSS), then adds multistage group of ESD in network transformer rear class
Multistage-combination protection is closed, however such scheme degree of protection can only cope with 10/700us communication waves, and residual voltage height is easily damaged
Secondary circuit chip.
Therefore, that there is residual voltages is higher, is easily damaged the problem of secondary circuit chip for traditional port-guard technology.
Utility model content
The purpose of this utility model is to provide a kind of low residual voltage network interface protection circuit and devices, it is intended to solve tradition
Port-guard technology that there is residual voltages is higher, is easily damaged the problem of secondary circuit chip.
The utility model embodiment provides a kind of low residual voltage network interface protection circuit, is connected to differential signal source with after
Between holding network integrated circuit, the low residual voltage network interface protection circuit includes：
The first order protection location of electric discharge aerial drainage for the first time is carried out for the output signal to the differential signal source, it is described
The first end of first order protection location is connect with the first end of the differential signal source, the second end of the first order protection location
It is connect with the second end of the differential signal source；
First order decoupling unit for eliminating the parasitic couplings generated in the low residual voltage network interface protection circuit, institute
The first input end for stating first order decoupling unit is connect with the first end of the first order protection location, the first order decoupling list
Second input terminal of member is connect with the second end of the first order protection location；
Residual voltage for being exported to the first order protection location carries out the second level protection of second of electric discharge aerial drainage
Unit, the first end of the second level protection location are connect with the first output end of the first order decoupling unit, and described second
The second end of grade protection location is connect with the second output terminal of the first order decoupling unit；
For reducing surge voltage, and export second level decoupling list of the optimization voltage to the back-end network integrated circuit
Member, the first input end of the second level decoupling unit are connect with the first end of the second level protection location, the second level
Second input terminal of decoupling unit is connect with the second end of the second level protection location, and the first of the second level decoupling unit
Output end is connect with the first input end of the back-end network integrated circuit, the second output terminal of the second level decoupling unit with
Second input terminal of the back-end network integrated circuit connects.
The another object of the utility model is, provides a kind of low residual voltage network interface protective device, the low residual voltage net
Network interference prevention device includes differential signal source and back-end network integrated circuit, and the low residual voltage network interface protective device also wraps
Include the low residual voltage net as described in any one of the above embodiments being connected between the differential signal source and the back-end network integrated circuit
Network interface protection circuit.
Low residual voltage network interface protection circuit in the utility model is connected to differential signal source and the integrated electricity of back-end network
Between road, which includes first order protection location, first order decoupling unit, second level protection list
Member and second level decoupling unit, by first order protection location and second level protection location two-stage protection circuit to surge current
Classification absorption is carried out, and eliminates parasitic couplings and reduction in circuit using first order decoupling unit and second level decoupling unit
Surge voltage so that the stable voltage of power output end output ensure that the safety of back-end network integrated circuit, this practicality are new
Type uses multistage combined protection, under the premise of not influencing properties of product, avoid the communication disruption caused by factors such as lightning stroke,
The problems such as crash and damage of product, and reduce later maintenance cost.
Description of the drawings
Fig. 1 is a kind of function structure chart for low residual voltage network interface protection circuit that the utility model embodiment 1 provides；
Fig. 2 is a kind of circuit structure diagram for low residual voltage network interface protection circuit that the utility model embodiment 2 provides；
Fig. 3 is a kind of circuit structure diagram for low residual voltage network interface protection circuit that the utility model embodiment 3 provides；
Fig. 4 is a kind of circuit structure diagram for low residual voltage network interface protection circuit that the utility model embodiment 4 provides；
Fig. 5 shows the circuit structure diagram of low residual voltage network interface protective device when 4 pairs of differential signal line inputs of connection.
Specific implementation mode
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only explaining this
Utility model is not used to limit the utility model.
Fig. 1 is a kind of circuit structure diagram for low residual voltage network interface protection circuit that the utility model embodiment 1 provides, and is
Convenient for explanation, only the parts related to this embodiment are shown, details are as follows：
The utility model embodiment provide a kind of low residual voltage network interface protection circuit 20 include：For to input signal
Carry out the first order protection location 201 of electric discharge aerial drainage for the first time, first end and the differential signal source 10 of first order protection location
First end connects, and the second end of first order protection location 201 is connect with the second end of differential signal source 10；For eliminating low residual voltage
The first order decoupling unit 202 of the parasitic couplings generated in network interface protection circuit, the first of first order decoupling unit 202 are defeated
Enter end to connect with the first end of first order protection location 201, the second input terminal and the first order of first order decoupling unit 202 are protected
The second end of unit 201 connects；Residual voltage for being exported to first order protection location 201 carries out second of aerial drainage that discharges
Second level protection location 203, the first end of second level protection location 203 connect with the first output end of first order decoupling unit 202
It connects, the second end of second level protection location 203 is connect with the second output terminal of first order decoupling unit 202；For reducing surge
The second level decoupling unit 204 of voltage, the of the first input end of second level decoupling unit 204 and second level protection location 203
One end connects, and the second input terminal of second level decoupling unit 204 is connect with the second end of second level protection location 203, the second level
First output end of decoupling unit 204 is connect with the first input end of back-end network integrated circuit 30, second level decoupling unit 204
Second output terminal connect with the second input terminal of back-end network integrated circuit 30.
Fig. 2 is a kind of circuit structure diagram for low residual voltage network interface protection circuit that the utility model embodiment 2 provides, and is
Convenient for explanation, only the parts related to this embodiment are shown, details are as follows：
First order protection location 201 in the present embodiment is gas-discharge tube GDT1, the first pole of gas-discharge tube GDT1
As the first end of first order protection location 201, the second pole of gas-discharge tube GDT1 as first order protection location 201
Two ends, the third pole ground connection of gas-discharge tube GDT1.
As one embodiment of the utility model, gas-discharge tube GDT1 is three pole ceramic discharge tubes, the pottery in the present embodiment
Porcelain discharge tube is filled with inert gas by the metal electrode of three band gaps and is constituted using ceramic enclosed package, inside, when being added to two
When the voltage of electrode tip reaches the gas breakdown made in gas-discharge tube, gas-discharge tube starts to discharge, and becomes low by high impedance
Impedance makes surge voltage be short-circuited to close to no-voltage rapidly, and overcurrent is released into ground, to play protection to subsequent conditioning circuit
Effect.
As one embodiment of the utility model, first order protection location 201 includes first the two poles of the earth ceramic discharge tube and second
The two poles of the earth ceramic discharge tube, wherein the first pole of first the two poles of the earth ceramic discharge tube connects the first end of differential signal source, first the two poles of the earth pottery
Second pole of porcelain discharge tube is grounded, and the first pole of second the two poles of the earth ceramic discharge tube connects the second end of differential signal source, second the two poles of the earth
Second pole of ceramic discharge tube is grounded.
As one embodiment of the utility model, first order decoupling unit 202 includes：First resistor R1 and second resistance R2,
First input end of the first end of first resistor R1 as first order decoupling unit 202, the second end of first resistor R1 is as
The first end of first output end of level-one decoupling unit 202, second resistance R2 is inputted as the second of first order decoupling unit 202
End, the second output terminal of the second end of second resistance R2 as first order decoupling unit 202.In the present embodiment, the first order is moved back
Coupling unit 202 is used to prevent first order protection location 201 with the electric current in second level protection location 203 during dropping rheology
Since the current russ formed in power supply circuit has an impact supply network stability, at this point, first order decoupling unit 202
It can effectively eliminate the parasitic couplings between circuit supply network.
As one embodiment of the utility model, the resistance value of first resistor R1 and second resistance R2 is 2.2 ohm.Specifically,
At this point, the resistance value of first resistor R1 and second resistance R2 is antisurge resistance, first resistor R1 can be born with second resistance R2
Maximum power be 2W, when the power of first resistor R1 and second resistance R2 are more than 2W, first resistor R1 and second resistance R2
Fusing, for protecting last secondary circuit not damaged by excessively high surge current.
As one embodiment of the utility model, the second level protection location 203 in the present embodiment includes：First diode
D1, the first unidirectional transient voltage suppressor diode TVS1, the second diode D2, the second unidirectional transient voltage suppressor diode
TVS2；The cathode of first unidirectional transient voltage suppressor diode TVS1 and the cathode of the second diode D2 connect altogether to be protected as the second level
The first end of unit 203 is protected, the anode of the first unidirectional transient voltage suppressor diode TVS1 and the anode of the first diode D1 connect
It connects, the anode of the second diode D2 is connect with the anode of the second unidirectional transient voltage suppressor diode TVS2, the first diode D1
Cathode and the second unidirectional transient voltage suppressor diode TVS2 cathode connect altogether as second level protection location 203 second
End.In the present embodiment, the first diode D1 and the second diode D2 is fast recovery diode, specifically, by using fast extensive
Reverse recovery time of multiple diode is shorter, forward voltage drop is relatively low, the higher feature of breakdown reverse voltage and unidirectional transient voltage
The aerial drainage in parallel for realizing surge current is carried out again after inhibiting Diode series.
As one embodiment of the utility model, second level decoupling unit 204 includes：3rd resistor R3, the 4th resistance R4；The
First input end of the first end of three resistance R3 as second level decoupling unit 204, the second end of 3rd resistor R3 is as second
The first end of first output end of grade decoupling unit 204, the 4th resistance R4 is inputted as the second of second level decoupling unit 204
End, the second output terminal of the second end of the 4th resistance R4 as second level decoupling unit 204.
As one embodiment of the utility model, the resistance value of 3rd resistor R3 and the 4th resistance R4 are 2.2 ohm.Specifically
, the resistance value of setting 3rd resistor R3 and the 4th resistance R4, which is 2.2 ohm, in the present embodiment can be lowered into the second level
Surge voltage in decoupling unit 204, and can ensure the safety of secondary circuit in the case where not influencing normal network communications.
As one embodiment of the utility model, the coil ratio of the first transformer T1 and the second transformer T2 are 1:1, pass through
The transformer of equal proportion coil is filtered the signal of input, avoids the problem that the signal in input circuit is disturbed.
Fig. 3 is a kind of circuit structure diagram for low residual voltage network interface protection circuit that the utility model embodiment 3 provides,
In the present embodiment, network transformer unit is also associated between second level decoupling unit 204 and back-end network integrated circuit 30
205, the first input end of network transformer unit 205 is connect with the first output end of second level decoupling unit 204, network transformation
Second input terminal of device unit 205 is connect with the second output terminal of second level decoupling unit 204, network transformer unit 205
First output end is connect with the first input end of back-end network integrated circuit 30, the second output terminal of network transformer unit 205
It is connect with the second input terminal of back-end network integrated circuit 30；
As one embodiment of the utility model, network transformer unit 205 includes：First transformer T1, the second transformer
T2, the 5th resistance R5, the first capacitance C1, third transformer T3, the first inductance L1, the second inductance L2, the 6th resistance R6, the second electricity
Hold C2；
First input end of the first input end of first transformer T1 as network transformer unit 205, the second transformer
Second input terminal of the first input end of T2 as network transformer unit 205, the second input terminal of the first transformer T1 and
The second input terminal of two transformer T2 is connected to the first end of the 5th resistance R5, the second end of the 5th resistance R5 and the first capacitance C1 altogether
First end connection, the second end ground connection of the first capacitance C1, the second output terminal of the first transformer T1 and the second transformer T2's
Second output terminal connects, and the first output end of the first transformer T1 is connect with the first input end of third transformer T3, and second becomes
The first output end of depressor T2 is connect with the second input terminal of third transformer T3, the first output end of third transformer T3 and
The first end of one inductance L1 connects the first output end as network transformer unit 205, the second output of third transformer T3 altogether
End and the first end of the second inductance L2 connect the second output terminal as network transformer unit member 205 altogether, and the of the first inductance L1
The second end of two ends and the second inductance L2 are connected to the first end of the 6th resistance R6, second end and the second capacitance of the 6th resistance R6 altogether
The first end of C2, the second end ground connection of the second capacitance C2.
Fig. 4 is a kind of circuit structure diagram for low residual voltage network interface protection circuit that the utility model embodiment 4 provides,
In the present embodiment, third level protection location is also associated between network transformer unit 205 and back-end network integrated circuit 30
206, the first end of third level protection location 206 is connect with the first output end of network transformer unit 205, and third level protection is single
The second end of member 206 is connect with the second output terminal of network transformer unit 205.Specifically, third level protection location 206 wraps
It includes：The unidirectional transient voltage suppressor diode TVS3 of third, third diode D3, the 4th unidirectional transient voltage suppressor diode TVS4
And the 4th diode D4；The cathode of the cathode and the 4th diode D4 of the unidirectional transient voltage suppressor diode TVS3 of third connects altogether
As the first end of third level protection location 206, anode and the unidirectional transient voltage suppressor diode of third of third diode D3
The anode of TVS3 connects, and the anode of the 4th unidirectional transient voltage suppressor diode TVS4 is connect with the anode of the 4th diode D4,
The cathode of the cathode of third diode D3 and the 4th unidirectional transient voltage suppressor diode TVS4 connect altogether protects list as the third level
The second end of member 206.
As one embodiment of the utility model, when differential signal source 10 is inputted by multipair differential lines, each pair of differential signal
Line accesses the corresponding low residual voltage network interface protection circuit 20 as in the various embodiments described above, so that differential signal is passed through corresponding
Low residual voltage network interface protection circuit 20 enters back-end network integrated circuit 30.
The utility model also proposes a kind of low residual voltage network interface protective device, which connects
It is connected between differential signal source 10 and back-end network integrated circuit 30, which includes such as above-mentioned
Low residual voltage network interface protection circuit described in one embodiment.
As one embodiment of the utility model, when differential signal source 10 is inputted by multipair differential lines, each pair of differential signal
Line accesses the corresponding low residual voltage network interface protection circuit 20 as in the various embodiments described above, so that differential signal is passed through corresponding
Low residual voltage network interface protection circuit 20 enters back-end network integrated circuit 30.For example, Fig. 5 shows 4 pairs of differential signals of connection
The circuit structure diagram of line low residual voltage network interface protective device when inputting, from figure 5 it can be seen that first in the present embodiment is low
Residual voltage network interface protection circuit includes：11st gas-discharge tube GDT11, eleventh resistor R11, twelfth resistor R12,
11 diode D11, the 11st unidirectional transient voltage suppressor diode TVS11, the 12nd diode D12, the 12nd unidirectional wink
State voltage suppression diode TVS12, thirteenth resistor R13, the 14th resistance R14, the 11st transformer T11, the 12nd transformation
Device T12, the 15th resistance R15 and the 11st capacitance C11, the 13rd transformer T13, the 11st inductance L11, the 12nd inductance
L12, the 16th resistance R16, the 13rd unidirectional transient voltage suppressor diode TVS13, the 13rd diode D13, the 14th list
To transient voltage suppressor diode TVS14 and the 14th diode D14.
Specifically, the first pole of the 11st gas-discharge tube GDT11, the first end of eleventh resistor R11 and first are poor
The first end in sub-signal source connects altogether, the second pole of the 11st gas-discharge tube GDT11, the first end of twelfth resistor R12 and
The second end of first differential signal source connects, the cathode of the 11st unidirectional transient voltage suppressor diode TVS11 and the two or two pole
The cathode of pipe D2 and the second end of eleventh resistor and the first end of thirteenth resistor R13 connect altogether, the 11st unidirectional transient state electricity
The anode for constraining diode TVS11 processed is connect with the anode of the 11st diode D1, the anode and the tenth of the 12nd diode D12
The anode of two unidirectional transient voltage suppressor diode TVS12 connects, the cathode and the 12nd unidirectional transient state of the 11st diode D11
The cathode of voltage suppression diode TVS12 and the second end of twelfth resistor and the first end of the 14th resistance R14 connect altogether.The
The first input end of 11 transformer T11 is connect with the second end of thirteenth resistor R13, the second end of the 14th resistance R14 with
The first input end of 12nd transformer T12 connects, the second input terminal of the 11st transformer T11, the 12nd transformer T12
The first end of second input terminal and the 15th resistance R15 connects altogether, and the second end of the 15th resistance R15 is with the 11st capacitance C11's
First end connects, the second end ground connection of the 11st capacitance C11.The first output end and the 13rd transformation of 11st transformer T11
The first input end of device connects, and the second output terminal of the 11st transformer T11 connects with the second output terminal of the 12nd transformer T12
It connects, the first output end of the 12nd transformer T12 is connect with the second input terminal of the 13rd transformer T13, the 13rd transformer
The moon of the first output end of T13, the first end of the 11st inductance L11, the 13rd unidirectional transient voltage suppressor diode TVS13
Pole, the 14th diode D4 the first input end of cathode and the first back-end network integrated circuit connect altogether, the 13rd transformer T13
Second output terminal, the first end of the 12nd inductance L12, the cathode of the 13rd diode D13, the 14th unidirectional transient voltage suppression
The cathode of diode TVS14 processed and the second input terminal of the first back-end network integrated circuit connect altogether, and the second of the 11st inductance L11
It holds, the second end of the 12nd inductance L12 connects connect altogether with the first end of the 16th resistance R16 altogether, the anode of the 13rd diode D13
It is connect with the anode of the 13rd unidirectional transient voltage suppressor diode TVS13, the 14th unidirectional transient voltage suppressor diode
The anode of TVS14 is connect with the anode of the 14th diode D14.
In the present embodiment, the first low residual voltage network interface protection circuit is correspondingly connected to the first differential signal source and first
Between back-end network integrated circuit, the second low residual voltage network interface protection circuit is correspondingly connected to the second differential signal source and second
Between back-end network integrated circuit, the low residual voltage network interface protection circuit of third is correspondingly connected to third differential signal source and third
Between back-end network integrated circuit, the 4th low residual voltage network interface protection circuit is correspondingly connected to the 4th differential signal source and the 4th
Between back-end network integrated circuit, wherein the low residual voltage network interface protection electricity of the second low residual voltage network interface protection circuit, third
The circuit of the circuit structure of road and the 4th low residual voltage network interface protection circuit residual voltage network interface protection circuit low with first
Structure is identical, and the 11st gas-discharge tube GDT11, the second low residual voltage network in the first low residual voltage network interface protection circuit
The 30th in the low residual voltage network interface protection circuit of the 21st gas-discharge tube GDT21 in interface protection circuit, third
The 41st gas-discharge tube GDT41 in one gas-discharge tube GDT31 residual voltage network interface protection circuits low with the 4th connects altogether
The second end of Yu Di, the 16th resistance R16 in the first low residual voltage network interface protection circuit, the second low residual voltage network interface are anti-
The 36th resistance in the low residual voltage network interface protection circuit of second end, third of the 26th resistance R26 in protection circuit
The second end and public capacitance of the 46th resistance R46 in the second end residual voltage network interface protection circuit low with the 4th of R36
C0 connects altogether, the second end ground connection of public capacitance C0.
To sum up, the utility model embodiment provide low residual voltage network interface protection circuit be connected to differential signal source with
Between back-end network integrated circuit, which includes first order protection location, first order decoupling list
Member, second level protection location and second level decoupling unit, it is anti-by first order protection location and second level protection location two-stage
Protection circuit carries out classification absorption to surge current, and is eliminated in circuit using first order decoupling unit and second level decoupling unit
Parasitic couplings and reduction surge voltage so that the stable voltage of power output end output ensure that back-end network integrated circuit
Safety, the utility model use multistage combined protection, under the premise of not influencing properties of product, avoid lightning stroke etc. because
Caused by element the problems such as communication disruption, crash and damage of product, and reduce later maintenance cost.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement etc., should be included in the utility model made by within the spirit and principle of utility model
Protection domain within.
Claims (10)
1. a kind of low residual voltage network interface protection circuit, is connected between differential signal source and back-end network integrated circuit, special
Sign is that the low residual voltage network interface protection circuit includes：
For the first order protection location for the aerial drainage that the output signal of the differential signal source discharge for the first time, described first
The first end of grade protection location is connect with the first end of the differential signal source, the second end of the first order protection location and institute
State the second end connection of differential signal source；
First order decoupling unit for eliminating the parasitic couplings generated in the low residual voltage network interface protection circuit, described
The first input end of level-one decoupling unit is connect with the first end of the first order protection location, the first order decoupling unit
Second input terminal is connect with the second end of the first order protection location；
Residual voltage for being exported to the first order protection location carries out the second level protection location of second of aerial drainage that discharges,
The first end of the second level protection location is connect with the first output end of the first order decoupling unit, the second level protection
The second end of unit is connect with the second output terminal of the first order decoupling unit；
For reducing surge voltage, and optimization voltage is exported to the second level decoupling unit of the back-end network integrated circuit, institute
The first input end for stating second level decoupling unit is connect with the first end of the second level protection location, the second level decoupling list
Second input terminal of member is connect with the second end of the second level protection location, the first output end of the second level decoupling unit
Connect with the first input end of the back-end network integrated circuit, the second output terminal of the second level decoupling unit with it is described after
Hold the second input terminal connection of network integrated circuit.
2. low residual voltage network interface protection circuit as described in claim 1, which is characterized in that the first order protection location is
Gas-discharge tube, the first end of the first pole of the gas-discharge tube as the first order protection location, the gas discharge
Second end of second pole of pipe as the first order protection location, the third pole ground connection of the gas-discharge tube.
3. low residual voltage network interface protection circuit as described in claim 1, which is characterized in that the first order decoupling unit packet
It includes：First resistor and second resistance；
First input end of the first end of the first resistor as the first order decoupling unit, the second of the first resistor
The first output end as the first order decoupling unit is held, the first end of the second resistance is as first order decoupling unit
Second input terminal, the second output terminal of the second end of the second resistance as the first order decoupling unit.
4. low residual voltage network interface protection circuit as described in claim 1, which is characterized in that the second level protection location packet
It includes：First diode, the first unidirectional transient voltage suppressor diode, the second diode, the second unidirectional transient voltage inhibit two poles
Pipe；
The cathode of the cathode and second diode of the first unidirectional transient voltage suppressor diode connects and altogether as described
The first end of second level protection location, anode and first diode of the first unidirectional transient voltage suppressor diode
Anode connects, and the anode of second diode is connect with the anode of the described second unidirectional transient voltage suppressor diode, described
The cathode of the cathode of first diode and the described second unidirectional transient voltage suppressor diode connects and is protected as the second level altogether
Protect the second end of unit.
5. low residual voltage network interface protection circuit as described in claim 1, which is characterized in that the second level decoupling unit packet
It includes：3rd resistor, the 4th resistance；
First input end of the first end of the 3rd resistor as the second level decoupling unit, the second of the 3rd resistor
The first output end as the second level decoupling unit is held, the first end of the 4th resistance is as second level decoupling unit
Second input terminal, the second output terminal of the second end of the 4th resistance as the second level decoupling unit.
6. low residual voltage network interface protection circuit as described in claim 1, which is characterized in that the second level decoupling unit with
Network transformer unit, the first input end of the network transformer unit are also associated between the back-end network integrated circuit
It is connect with the first output end of the second level decoupling unit, the second input terminal of the network transformer unit and described second
The second output terminal connection of grade decoupling unit, the first output end and the integrated electricity of the back-end network of the network transformer unit
The first input end on road connects, the second output terminal of the network transformer unit and the second of the back-end network integrated circuit
Input terminal connects.
7. low residual voltage network interface protection circuit as claimed in claim 6, which is characterized in that the network transformer unit packet
It includes：First transformer, the second transformer, the 5th resistance, the first capacitance, third transformer, the first inductance, the second inductance, the 6th
Resistance, the second capacitance；
First input end of the first input end of first transformer as the network transformer unit, second transformation
Second input terminal of the first input end of device as the network transformer unit, the second input terminal of first transformer with
Second input terminal of second transformer is connected to the first end of the 5th resistance, the second end of the 5th resistance and institute altogether
State the first capacitance first end connection, first capacitance second end ground connection, the second output terminal of first transformer with
The second output terminal of second transformer connects, and the of the first output end of first transformer and the third transformer
One input terminal connects, and the first output end of second transformer is connect with the second input terminal of the third transformer, described
The first end of first output end of third transformer and first inductance connects and altogether as the of the network transformer unit
The first end of one output end, the second output terminal of the third transformer and second inductance connects and becomes as the network altogether
The second output terminal of depressor unit, second end and sixth electricity of the second end of first inductance with second inductance
The first end of resistance connects altogether, the first end of the second end and second capacitance of the 6th resistance, and the second of second capacitance
End ground connection.
8. low residual voltage network interface protection circuit as claimed in claim 6, which is characterized in that the network transformer unit with
Third level protection location, the first end of the third level protection location and institute are also associated between the back-end network integrated circuit
State the first output end connection of network transformer unit, the second end of the third level protection location and the network transformer list
The second output terminal connection of member.
9. low residual voltage network interface protection circuit as claimed in claim 8, which is characterized in that the third level protection location packet
It includes：The unidirectional transient voltage suppressor diode of third, third diode, the 4th unidirectional transient voltage suppressor diode and the four or two
Pole pipe；
The cathode of the cathode of the unidirectional transient voltage suppressor diode of third and the 4th diode is connect altogether as described the
The first end of three-level protective unit, the sun of the anode and the unidirectional transient voltage suppressor diode of the third of the third diode
Pole connects, and the anode of the 4th unidirectional transient voltage suppressor diode connect with the anode of the 4th diode, and described the
The cathode of the cathode of three diodes and the 4th unidirectional transient voltage suppressor diode connects altogether protects list as the third level
The second end of member.
10. a kind of low residual voltage network interface protective device, including differential signal source and back-end network integrated circuit, feature exist
In the low residual voltage network interface protective device further includes being connected to the differential signal source and the back-end network integrated circuit
Between low residual voltage network interface protection circuit as claimed in any one of claims 1-9 wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820415728.4U CN207967933U (en) | 2018-03-23 | 2018-03-23 | A kind of low residual voltage network interface protection circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820415728.4U CN207967933U (en) | 2018-03-23 | 2018-03-23 | A kind of low residual voltage network interface protection circuit and device |
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| CN207967933U true CN207967933U (en) | 2018-10-12 |
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| CN201820415728.4U Active CN207967933U (en) | 2018-03-23 | 2018-03-23 | A kind of low residual voltage network interface protection circuit and device |
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| CN (1) | CN207967933U (en) |
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