CN206350006U - Vehicle-mounted ethernet circuit plate - Google Patents
Vehicle-mounted ethernet circuit plate Download PDFInfo
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- CN206350006U CN206350006U CN201621233663.9U CN201621233663U CN206350006U CN 206350006 U CN206350006 U CN 206350006U CN 201621233663 U CN201621233663 U CN 201621233663U CN 206350006 U CN206350006 U CN 206350006U
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- common mode
- ethernet
- filter
- mode inductance
- differential lines
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Abstract
A kind of vehicle-mounted ethernet circuit plate, is related to technical field of automotive electronics, and what is solved is jamproof technical problem.The circuit board includes PCB substrate, and Ethernet drive module in PCB substrate, Ethernet connector；Connection Ethernet drive module, the differential lines of Ethernet connector, return wire are printed with the PCB substrate, and differential lines, return wire are laid on non-adjacent layers, differential lines suppress diode, the second electrostatic provided with the first common mode inductance, the second common mode inductance, the first electrostatic and suppress diode, the first filter capacitor, the second filter capacitor, the 3rd filter capacitor, the 4th filter capacitor, the first filter resistance, the second filter resistance, the 3rd filter resistance, the 4th filter resistance.The circuit board that the utility model is provided, strong antijamming capability.
Description
Technical field
The utility model is related to automotive electronic technology, more particularly to a kind of technology of vehicle-mounted ethernet circuit plate.
Background technology
With drive assist system more and more universal and information entertainment increasingly complex, the bandwidth of In-vehicle networking is needed
Ask also increasing, therefore vehicle-mounted ethernet technology has the trend for gradually replacing CAN.
Vehicle-mounted Ethernet can significantly reduce system complexity, link cost and wiring weight, also facilitate in the future to optical fiber
Standard extension, but its frequency high-speed is fast, and big data is transmitted, more sensitive to disturbing, demand on signal quality is higher, but car
Upper bad environments, its interference free performance need to constantly be strengthened and improvement can be only achieved requirement, and be realized using placement-and-routing's optimization
The standard of interference free performance is the mode for not accounting for device space and low cost, device aging when it also avoid using device countermeasure
Risk, it is thus also avoided that using the injury being likely to result in itself to useful signal during device, with high reliability.
Conventional vehicle-mounted Ethernet has following several for the scheme of interference free performance at present：
1）In differential lines the noise jamming on line is filtered out using the wave filter of precision resister, electric capacity, inductance composition.
But this method has limitation, the noise beyond useful signal frequency band can only be suppressed, and can not be suppressed and the same frequency range of signal
Noise jamming.
2）Suppress to include the common mold noise interference in co-channel interference frequency range using common mode inductance.But common mode inductance also has office
Sex-limited, it effectively, is caused, or reach common mode electricity only to the interference of balance if noise in differential lines two lines is not of uniform size
The Time Inconsistency of sense, the ability that common mode inductance suppresses noise will stamp very big discount.
3）Differential lines needs are isometric, and practices well is that the differential lines overall length of requirement chip to interface is isometric.But overall length is isometric
With limitation, in fact, the result done so is（Common mode inductance etc.）Differential lines before wave filter are Length discrepancies, are caused
Common-mode noise successively reaches wave filter with unbalanced state, does not accomplish that noise is offset simultaneously, causes interference free performance to deteriorate.
4）The cabling parameter of Ethernet differential lines（Such as in line width, line-linear distance, line-ground distance）, conventional way is
A unified value is drawn using SI9000 emulation on the premise of 100ohm.But in fact, cabling is run into after wave filter, impedance
Having undergone mutation causes signal reflex and superposition, so as to result in the deterioration of jitter and interference free performance.
5）What the reference layer of Ethernet differential lines was conventional in multi-layer sheet is adjacent stratum.But ensureing 100ohm impedances
Limitation downward cabling only has 4mils or so, and this meeting causes the big change of impedance because of the line width slight change that foozle be caused,
So as to cause the deterioration of signal quality and Immunity Performance.
Utility model content
For defect present in above-mentioned prior art, technical problem to be solved in the utility model is to provide a kind of poor
Divide the uniformity and balance of impedance good, the vehicle-mounted ethernet circuit plate of strong antijamming capability.
In order to solve the above-mentioned technical problem, a kind of vehicle-mounted ethernet circuit plate provided by the utility model, including PCB bases
Plate, and Ethernet drive module in PCB substrate, Ethernet connector；
The PCB substrate is that connection Ethernet drive module, Ethernet connector are printed with multi-layer sheet, PCB substrate
Differential lines, return wire；The return wire is the positive power line or ground wire being printed in PCB substrate；
It is characterized in that：The differential lines, return wire are laid on the non-adjacent layers of PCB substrate, and differential lines are provided with the
One common mode inductance, the second common mode inductance, the first electrostatic suppress diode, the second electrostatic and suppress diode, the first filter capacitor, the
Two filter capacitors, the 3rd filter capacitor, the 4th filter capacitor, the first filter resistance, the second filter resistance, the 3rd filter resistance,
4th filter resistance；
The input of first coil of first common mode inductance is connected to Ethernet drive module through the second filter resistance
Differential signal positive output end, and by the second electrostatic suppress diode be connected to ground；
The output end of first coil of first common mode inductance is successively through the 4th filter capacitor, the second common mode inductance
First coil is connected to the differential signal normal phase input end of Ethernet connector, and successively through the 4th filter resistance, the second filtering
Electric capacity is connected to ground；
The input of second coil of first common mode inductance is connected to Ethernet drive module through the first filter resistance
Differential signal reversed-phase output, and by the first electrostatic suppress diode be connected to ground；
The output end of second coil of first common mode inductance is successively through the 3rd filter capacitor, the second common mode inductance
Second coil is connected to the differential signal inverting input of Ethernet connector, and successively through the 3rd filter resistance, the first filtering
Electric capacity is connected to ground.
Further, if the differential signal of the differential signal positive output end of Ethernet drive module and Ethernet connector
The length of differential lines between normal phase input end is d11, the differential signal reversed-phase output and Ethernet of Ethernet drive module
The length of differential lines between the differential signal inverting input of connector is d12, then has d11=d12.
Further, if the output end of first coil of the first common mode inductance and first coil of the second common mode inductance
Input between the length of differential lines be d21, the output end of second coil of the first common mode inductance and the second common mode electricity
The length of differential lines between the input of second coil of sense is d22, then has d21=d22.
Further, if the differential signal of the output end of first coil of the second common mode inductance and Ethernet connector just
The length of differential lines between phase input is d31, and the output end of second coil of the second common mode inductance is connected with Ethernet
The length of differential lines between the differential signal inverting input of part is d32, then has d31=d32.
Further, phase alternating floor between the differential lines and return wire, the line width of differential lines is more than or equal to 6.4mils.
Further, have in the PCB substrate in one outlet region, the exit region and include Ethernet connection
Part, the second common mode inductance and the differential lines of the rwo are connected, the exit region of the return wire and PCB substrate staggers.
Further, first filter resistance, the second filter resistance are identical devices, the 3rd filter resistance,
4th filter resistance is identical device, and first filter capacitor, the second filter capacitor are identical devices, the 3rd filter
Ripple electric capacity, the 4th filter capacitor are identical devices, and it is phase that first electrostatic, which suppresses diode, the second electrostatic and suppresses diode,
Same device, first common mode inductance, the second common mode inductance are identical devices.
The vehicle-mounted ethernet circuit plate that the utility model is provided, non-adjacent layers are laid in by differential lines, return wire, using only
Special cabling scenario isolation external disturbance and maintenance differential lines impedance stabilization, and strengthen the balance of differential lines, with difference resistance
Anti- uniformity and balance are good, effectively reduce interference noise, enhance Ethernet antijamming capability, high efficiency, low cost
Solve the problem of vehicle-mounted Ethernet interference free performance is not enough.
Brief description of the drawings
Fig. 1 is the circuit diagram of the vehicle-mounted ethernet circuit plate of the utility model embodiment.
Embodiment
Below in conjunction with brief description of the drawings embodiment of the present utility model is described in further detail, but the present embodiment and without
It is every to use similar structure of the present utility model and its similar change in limitation the utility model, the utility model all should be included in
Protection domain, the pause mark in the utility model represents the relation of sum.
As shown in figure 1, a kind of vehicle-mounted ethernet circuit plate that the utility model embodiment is provided, including PCB substrate, and
Ethernet drive module U1, Ethernet connector U2 in PCB substrate；
The PCB substrate is that connection Ethernet drive module U1, Ethernet connector are printed with multi-layer sheet, PCB substrate
U2 differential lines, return wire；The return wire is the positive power line or ground wire being printed in PCB substrate；
It is characterized in that：The differential lines, return wire are laid on the non-adjacent layers of PCB substrate, and differential lines are provided with the
One common mode inductance L1, the second common mode inductance L2, the first electrostatic suppress diode D1, the second electrostatic and suppress diode D2, the first filter
Ripple electric capacity C1, the second filter capacitor C2, the 3rd filter capacitor C3, the 4th filter capacitor C4, the first filter resistance R1, the second filtering
Resistance R2, the 3rd filter resistance R3, the 4th filter resistance R4；
The input of first coil of the first common mode inductance L1 is connected to Ethernet driving through the second filter resistance R2
Module U1 differential signal positive output end, and it is connected to ground by the second electrostatic suppression diode D2；
The output end of first coil of the first common mode inductance L1 is successively through the 4th filter capacitor C4, the second common mode electricity
Sense L2 first coil is connected to Ethernet connector U2 differential signal normal phase input end, and successively through the 4th filter resistance
R4, the second filter capacitor C2 are connected to ground；
The input of second coil of the first common mode inductance L1 is connected to Ethernet driving through the first filter resistance R1
Module U1 differential signal reversed-phase output, and it is connected to ground by the first electrostatic suppression diode D1；
The output end of second coil of the first common mode inductance L1 is successively through the 3rd filter capacitor C3, the second common mode electricity
Sense L2 second coil is connected to Ethernet connector U2 differential signal inverting input, and successively through the 3rd filter resistance
R3, the first filter capacitor C1 are connected to ground；
If the differential signal positive of Ethernet drive module U1 differential signal positive output end and Ethernet connector U2
The length of differential lines between input is d11, and Ethernet drive module U1 differential signal reversed-phase output and Ethernet connect
The length of differential lines between fitting U2 differential signal inverting input is d12, then has d11=d12；
If the output end of the first common mode inductance L1 first coil is defeated with the second common mode inductance L2 first coil
The length for entering the differential lines between end is d21, output end and the second common mode inductance of the first common mode inductance L1 second coil
The length of differential lines between the input of L2 second coil is d22, then has d21=d22；
If the output end of the second common mode inductance L2 first coil and Ethernet connector U2 differential signal positive are defeated
The length for entering the differential lines between end is d31, output end and the Ethernet connector of the second common mode inductance L2 second coil
The length of differential lines between U2 differential signal inverting input is d32, then has d31=d32.
In the utility model embodiment, d11 and d12 control errors are within ± 5mils, d21 and d22 control errors
Within ± 5mils, d31 and d32 control errors can cause within ± 5mils, thus from outside netting twine and along
The interference noise that Ethernet interface enters mainboard can reach wave filter simultaneously, while being suppressed to be cancelled by wave filter
Fall, to improve common mode inhibition capacity, lift interference free performance.
In the utility model embodiment, phase alternating floor between the differential lines and return wire, differential lines therein are laid in
The first layer of PCB substrate, return wire is laid in the third layer of PCB substrate, and the line width of differential lines is more than or equal to 6.4mils, this reality
With in new other embodiments, between differential lines and return wire more than phase alternating floor.
In the utility model embodiment, there is one outlet region in the PCB substrate, include in the exit region with
Too net connector U2, the second common mode inductance L2 and the exit region for connecting the differential lines of the rwo, the return wire and PCB substrate
Stagger（The way of this example is that remaining all copper sheet is hollowed out in addition to differential lines in the exit region, between the line of differential lines two mutually
For reflux carrier）, because exit region is the path that external interference is come in by wire harness, this region can flow through very big noise
Electric current, return wire staggers with exit region, it is ensured that noise current can not flow through the ground below differential lines, so as to eliminate down
Side and the coupling of both sides ground noise；And accomplish that two lines flow back each other, strengthen the coupling between differential lines, improve two lines
Between balance, greatly improve interference rejection ability；And also reduce connector PIN to stub caused by copper sheet parasitic capacitance
Effect, lifting differential lines balance and signal quality.
In the utility model embodiment, the first filter resistance R1, the second filter resistance R2 are identical devices, described
3rd filter resistance R3, the 4th filter resistance R4 are identical devices, and the first filter capacitor C1, the second filter capacitor C2 are
Identical device, the 3rd filter capacitor C3, the 4th filter capacitor C4 are identical devices, and first electrostatic suppresses two poles
It is identical device that pipe D1, the second electrostatic, which suppress diode D2, and the first common mode inductance L1, the second common mode inductance L2 are identical
Device.
The operation principle of the utility model embodiment is as follows：
High speed signal is in transmission, and the flow direction of signal is to reach Ethernet along differential lines from Ethernet drive module to connect
Fitting U2, then from Ethernet connector along return wire return Ethernet drive module, due to copper foil there is also distributed inductance,
Electric capacity and resistance, under high-frequency signal, return wire is also the presence of impedance, and this impedance increased dramatically with the increase of frequency,
Path is longer, and impedance is bigger, and differential lines, return wire are laid on the non-adjacent layers of PCB substrate, can increase Ethernet difference
Spacing between line and its return wire so that it is relatively thick that differential lines can be designed, can slow down impedance variations, and traditional ether
The differential lines of net circuit board are all disposed within adjacent layer with its return wire, then the line width of differential lines only has general 4mils or so；So
Thin cabling is close to the accuracy of manufacture limit, and impedance can be because the manufacture deviation of line width causes impedance variations very big, overstriking line width
Afterwards, impedance variations will be much smaller caused by same deviation.
The isometric traditional method of differential lines is that the differential lines overall length of chip to interface is isometric.But overall length is isometric to have limitation,
In fact, the result done so is（Common mode inductance etc.）Differential lines before wave filter are Length discrepancies, cause common-mode noise with
Unbalanced state successively reaches wave filter, does not accomplish that noise is offset simultaneously, causes interference free performance to deteriorate, and implements segmentation isometric
Afterwards, accomplish that connector is isometric to the length between filtering device so that noise reaches that filtering device is suppressed simultaneously simultaneously, so that
Strengthen the balance of differential lines body, lift the common-mode rejection ratio of differential lines.
In High Speed System, interface area is the path that external interference is come in by wire harness, and this region can be flowed through very big
Noise current, these noise currents can disturb the cabling of interface area to cause system unstable.The copper sheet of exit region is hollowed out,
It can ensure that noise current can not flow through the ground below differential lines, so as to eliminate the coupling of lower section and both sides ground noise；And
And accomplish that two lines flow back each other, the coupling between differential lines is strengthened, the balance of line-to-line is improved, greatly improves anti-interference
Ability；And also reduce connector PIN to stub effect caused by copper sheet parasitic capacitance, lifting differential lines balance and signal
Quality.
Claims (7)
1. a kind of vehicle-mounted ethernet circuit plate, including PCB substrate, and Ethernet drive module in PCB substrate, ether
Net connector；
The PCB substrate is that connection Ethernet drive module, the difference of Ethernet connector are printed with multi-layer sheet, PCB substrate
Line, return wire；The return wire is the positive power line or ground wire being printed in PCB substrate；
It is characterized in that：The differential lines, return wire are laid on the non-adjacent layers of PCB substrate, and differential lines are total to provided with first
Mould inductance, the second common mode inductance, the first electrostatic suppress diode, the second electrostatic and suppress diode, the first filter capacitor, the second filter
Ripple electric capacity, the 3rd filter capacitor, the 4th filter capacitor, the first filter resistance, the second filter resistance, the 3rd filter resistance, the 4th
Filter resistance；
The input of first coil of first common mode inductance is connected to the difference of Ethernet drive module through the second filter resistance
Sub-signal positive output end, and it is connected to ground by the second electrostatic suppression diode；
The output end of first coil of first common mode inductance successively through the 4th filter capacitor, the second common mode inductance first
Individual coil is connected to the differential signal normal phase input end of Ethernet connector, and successively through the 4th filter resistance, the second filter capacitor
It is connected to ground；
The input of second coil of first common mode inductance is connected to the difference of Ethernet drive module through the first filter resistance
Sub-signal reversed-phase output, and it is connected to ground by the first electrostatic suppression diode；
The output end of second coil of first common mode inductance successively through the 3rd filter capacitor, the second common mode inductance second
Individual coil is connected to the differential signal inverting input of Ethernet connector, and successively through the 3rd filter resistance, the first filter capacitor
It is connected to ground.
2. vehicle-mounted ethernet circuit plate according to claim 1, it is characterised in that：If the difference letter of Ethernet drive module
The length of differential lines number between positive output end and the differential signal normal phase input end of Ethernet connector is d11, Ethernet
Differential lines between the differential signal reversed-phase output of drive module and the differential signal inverting input of Ethernet connector
Length is d12, then has d11=d12.
3. vehicle-mounted ethernet circuit plate according to claim 1, it is characterised in that：If first line of the first common mode inductance
The length of differential lines between the input of first coil of the output end of circle and the second common mode inductance is d21, the first common mode
The length of differential lines between the input of the output end of second coil of inductance and second coil of the second common mode inductance
For d22, then there is d21=d22.
4. vehicle-mounted ethernet circuit plate according to claim 1, it is characterised in that：If first line of the second common mode inductance
The length of differential lines between the output end of circle and the differential signal normal phase input end of Ethernet connector is d31, the second common mode
The length of differential lines between the output end of second coil and the differential signal inverting input of Ethernet connector of inductance
For d32, then there is d31=d32.
5. vehicle-mounted ethernet circuit plate according to claim 1, it is characterised in that：Phase between the differential lines and return wire
Alternating floor, the line width of differential lines is more than or equal to 6.4mils.
6. vehicle-mounted ethernet circuit plate according to claim 1, it is characterised in that：There is one in the PCB substrate to go out
Include Ethernet connector, the second common mode inductance in mouth region domain, the exit region and connect the differential lines of the rwo, described time
Streamline and the exit region of PCB substrate stagger.
7. vehicle-mounted ethernet circuit plate according to claim 1, it is characterised in that：First filter resistance, the second filter
Ripple resistance is identical device, and the 3rd filter resistance, the 4th filter resistance are identical devices, first filtered electrical
Hold, the second filter capacitor is identical device, the 3rd filter capacitor, the 4th filter capacitor are identical devices, described the
It is identical device that one electrostatic, which suppresses diode, the second electrostatic and suppresses diode, first common mode inductance, the second common mode inductance
It is identical device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621233663.9U CN206350006U (en) | 2016-11-17 | 2016-11-17 | Vehicle-mounted ethernet circuit plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621233663.9U CN206350006U (en) | 2016-11-17 | 2016-11-17 | Vehicle-mounted ethernet circuit plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206350006U true CN206350006U (en) | 2017-07-21 |
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ID=59316655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621233663.9U Active CN206350006U (en) | 2016-11-17 | 2016-11-17 | Vehicle-mounted ethernet circuit plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206350006U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106487520A (en) * | 2016-11-17 | 2017-03-08 | 延锋伟世通电子科技（上海）有限公司 | A kind of vehicle-mounted ethernet circuit plate |
-
2016
- 2016-11-17 CN CN201621233663.9U patent/CN206350006U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106487520A (en) * | 2016-11-17 | 2017-03-08 | 延锋伟世通电子科技（上海）有限公司 | A kind of vehicle-mounted ethernet circuit plate |
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