CN208093288U - A kind of common mode inductance and the network electronic devices with it - Google Patents
A kind of common mode inductance and the network electronic devices with it Download PDFInfo
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- CN208093288U CN208093288U CN201820361340.0U CN201820361340U CN208093288U CN 208093288 U CN208093288 U CN 208093288U CN 201820361340 U CN201820361340 U CN 201820361340U CN 208093288 U CN208093288 U CN 208093288U
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Abstract
The utility model discloses a kind of common mode inductance and with its network electronic devices.The common mode inductance includes a magnetic core and two twisted-pair feeders being wrapped on the magnetic core；The number of turns that first twisted-pair feeder and the second twisted-pair feeder are wound on the magnetic core is identical, and its winding direction is arranged so that：Under current direction unanimous circumstances, the magnetic direction that two twisted-pair feeders generate in the magnetic core is consistent.Two twisted-pair feeders are arranged in the common mode inductance of the utility model on the same magnetic core, and two twisted-pair feeders are arranged so that in the case of same current that two twisted-pair feeders generate identical magnetic field on the magnetic core in the direction and the number of turns wound on the magnetic core.Increase inductance as a result, avoids common mode inductance inductance in the case where POE powers high current from being saturated, and improve the ability of suppression common mode signal, and allow to using the smaller magnetic core of size.
Description
Technical field
The utility model is related to network electronic devices technical field, more particularly, to electronic equipment Anti-Jamming Technique field,
More particularly to a kind of common mode inductance and with its network electronic devices.
Background technology
In general, the network inter-face portion of electronic equipment is because high-frequency signal can be transmitted, and energy is stronger, and be that equipment is external
Interface often becomes the EMI radiation source of equipment.For this purpose, a common mode inductance can be increased in the differential lines of network transmission to press down
Common-mode signal (i.e. the main source of EMI radiation) processed, to reduce the external radiation energy size of equipment, conventional network interface common mode
The common mode inductance of signal inhibition is designed referring to Fig. 1.Common-mode signal refers to that amplitude is equal, the identical signal of phase.
In the common mode inductance for high speed signal common mode inhibition, it is wound in magnetic core again after a pair of of differential lines are twisted together
On.In this way when transmitting difference mode signal, since electric current total in conducting wire is 0 (both threads when differential mode signal transmission in a pair of line
The upper size of current same direction is opposite), therefore common mode inductance does not have inhibition to difference mode signal.When transmitting common-mode signal,
Since electric current total in conducting wire is not 0, the performance of common mode inductance will be similar with a simple inductance, i.e., logical direct current resistance is handed over
Stream further decreases to generate inhibiting effect to high frequency common-mode signals because of EMI problems caused by high frequency common-mode signals.
Traditional common mode inductance suppression common mode can interfere well when being applied to ordinary network interface, but be applied to network
Some problems are had when the equipment such as electronic equipment.Specifically, it when network electronic devices are powered using POE, can be passed by cable
Defeated prodigious direct current signal.Network electronic devices refer to the electronic equipment for having network interface.
Above-mentioned high current will lead to the problem of two.First problem be so that common mode inductance inductance coiling on by
Electric current is very big, and being lost and generating heat on line will become very serious.Second Problem is that high current will cause inductance to be saturated, and is inhibited altogether
The ability of mould signal reduces.For first problem, can be realized by thickening coil, and for Second Problem, then usually
It is realized by increasing magnetic core.And increasing the mode of magnetic core will cause device size to become larger rapidly in the case that electric current is prodigious,
And magnetic core size becomes larger, and influences whether the differential-mode characteristic of application while common mode inductance of the common mode inductance on small-size product
It will be affected.
Thus, it is desirable to have a kind of technical solution needs to use large scale magnetic to overcome or at least mitigate the above-mentioned of the prior art
The defect of core.
Utility model content
The utility model belongs to the EMI issue-resolutions of network electronic devices technical field.What the utility model solved
Technical problem is the super-large current for keeping equipment that can support POE in the case of common mode component energy on eliminating legacy network
Power supply capacity.
The utility model embodiment is to provide a kind of common mode inductance for supporting super-large current POE to power to overcome or at least
Mitigate at least one of the drawbacks described above of the prior art.
The utility model embodiment is to provide a kind of network electronic devices to overcome or at least mitigate the upper of the prior art
State at least one of defect.
The utility model embodiment provides a kind of common mode inductance for supporting super-large current POE to power, the common mode electricity
Sense includes a magnetic core and two twisted-pair feeders being wrapped on the magnetic core；First twisted-pair feeder and the second twisted-pair feeder are described
The number of turns wound on magnetic core is identical, and its winding direction is arranged so that：Under current direction unanimous circumstances, described two double
The magnetic direction that twisted wire generates in the magnetic core is consistent.The common mode inductance of the utility model is arranged two on the same magnetic core
Twisted-pair feeder, and two twisted-pair feeders are the case where the direction and the number of turns wound on the magnetic core is arranged so that in same current
Under, two twisted-pair feeders generate identical magnetic field on the magnetic core.
Preferably, the magnetic core is magnet ring.
Preferably, the winding direction of first twisted-pair feeder and the second twisted-pair feeder on magnet ring is on the contrary, and in the magnet ring
Upper mirror symmetry setting.
Preferably, the length of half is covered on first twisted-pair feeder and each leisure magnet ring of the second twisted-pair feeder.
Preferably, the magnetic core is linear type magnetic core, and first twisted-pair feeder and the second twisted-pair feeder are with identical winding side
To the one ends wound from the linear type magnetic core to the other end of the linear type magnetic core.
Preferably, first twisted-pair feeder and the second twisted-pair feeder are only needing the when of being drawn from magnetic core to terminate multiple twin pass
System, in conducting wire multiple twin, it is 100ohm to keep the differential impedance of first twisted-pair feeder and the second twisted-pair feeder.
Preferably, the common mode inductance is encapsulated as a 8pin foot device, and side setting is another there are four input pin feet
Side exports pin feet there are four being symmetrical arranged.
Preferably, the material of the magnet ring is MnZn alloy, and the size of the magnet ring is：Outer circumference diameter is 2-4mm；It is interior
All diameters are 1mm-2mm；The height of magnet ring is 2mm to 3mm；The number of turns that first twisted-pair feeder is wound on the magnetic core is 10
To 20 circles；The thickness of every single line of first twisted-pair feeder and the second twisted-pair feeder is 0.05mm to 0.3mm.It is highly preferred that institute
The size for stating magnet ring is：Outer circumference diameter=3.05mm；Inner circumferential diameter=1.78mm；Height=2.54mm of magnet ring；Described first
The number of turns that twisted-pair feeder is wound on the magnetic core is 13 circles；The thickness of every single line of first twisted-pair feeder and the second twisted-pair feeder
For 0.1mm.
The utility model also provides a kind of network electronic devices, and the network electronic devices include that POE network interfaces and network become
Depressor is connected with common mode inductance, wherein the common mode inductance is as described above between the POE network interfaces and network transformer
Common mode inductance, wherein the first twisted-pair feeder is for transmitting RX+/- signal；Second twisted-pair feeder is for transmitting TX+/- signal.
Preferably, the POE network interfaces are gigabit network interface, and the quantity of the common mode inductance is two.
Preferably, the common mode inductance is arranged in the network transformer on same pcb board.
Two twisted-pair feeders are arranged in the common mode inductance of the utility model on the same magnetic core, and by two twisted-pair feeders described
The direction and the number of turns wound on magnetic core is arranged so that in the case of same current, two twisted-pair feeders generate on the magnetic core
Identical magnetic field.Increase inductance as a result, avoids common mode inductance from causing inductance to be saturated in the case where POE powers high current, and improve inhibition
The ability of common-mode signal, and allow to using the smaller magnetic core of size.
Description of the drawings
Fig. 1 is the high speed signal common mode inductance design scheme of the prior art.
Fig. 2 shows the general structures of the network electronic devices of such as web camera.
Fig. 3 is POE power supply circuits.
Fig. 4 is the super large POE electric current common mode inductance schematic diagrames according to the utility model first embodiment.
Fig. 5 is the encapsulation schematic diagram of the common mode inductance of the utility model.
Fig. 6 is the access schematic diagram of the common mode inductance of the utility model.
Fig. 7 is the schematic diagram according to the common mode inductance of the utility model second embodiment.
Reference numeral：
Specific implementation mode
In the accompanying drawings, it indicates same or similar element using same or similar label or there is same or like function
Element.The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.
Term "center", " longitudinal direction ", " transverse direction ", "front", "rear", "left", "right", " perpendicular in the description of the present invention,
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom" "inner", "outside" is orientation based on ... shown in the drawings or position
Relationship is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply the indicated device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore should not be understood as to scope of protection of the utility model
Limitation.
Referring to Fig. 2, the exemplary web camera as network electronic devices generally includes camera lens, imaging sensor, place
Manage device chip (CPU), network chip, network interface (network interface), power supply circuit and shell mechanism.Network interface is because height can be transmitted
Frequency signal, and energy is stronger, and be equipment external interface, often become the EMI radiation source of equipment.
Electromagnetic interference (EMI, Electromagnetic Interference) refers to after electromagnetic wave is acted on electronic component
And the interference phenomenon generated, there are two kinds of Conduction Interference and radiation interference.Conduction Interference refers to by conducting medium a power grid
Another electric network is arrived in signal coupling (interference) on network.Radiation interference refers to that interference source is (dry the coupling of its signal by space
Disturb) another electric network is arrived, in High-Speed PCB and system design, high-frequency signal line, the pin of integrated circuit, all kinds of connectors
Deng being all likely to become the radiation interference source with antenna performance, electromagnetic wave can be emitted and influence in other systems or this system other
The normal work of subsystem.
Usually there are two types of power supply modes, the i.e. power supply of common power adapter and POE power supplies for web camera.Using POE
When power supply, the prodigious direct current signal of network cable transmission can be passed through.Specifically, when using POE power supplies, the letter from network interface
It detaches number at network transformer, is separated into high-frequency signal and direct current signal, wherein direct current signal is used as supply current.To,
It powers using POE, and common mode inductance is set when inhibiting EMI, to flow through the common mode electricity between network interface and network transformer
The electric current of sense is very big.
POE (Power Over Ethernet) refers to not making in existing Ethernet Cat.5 wirings architecture any
In the case of change, for some IP-based terminals (such as IP telephone machine, wireless local network connecting point AP, web camera)
While transmission data signal, moreover it is possible to which the technology of direct current supply is provided for such equipment.
According to current POE agreements：Equipment power supply maximum power based on 802.3AF agreements is about 13W, corresponding maximum electricity
Stream is about 350mA；Equipment power supply maximum power based on 802.3AT agreements is about 25.4W, and corresponding maximum current is about 720mA；
And the estimated maximum output power of equipment based on newest 802.3BT agreements is about 75W, corresponding maximum current is about 2000mA.
The circuit powered to equipment by POE is referring to Fig. 3.In POE power supply circuits shown in Fig. 3, in network communications,
Circuit RX- and RX+ are a pair of of differential signal (also referred to as difference mode signal), and circuit TX- and TX+ are also a pair of of differential signal.Difference
Signal or difference mode signal refer to that the amplitude transmitted in a pair of of differential lines is equal, the signal of opposite in phase.
Aforementioned two pairs of signal wires are used for transmission high frequency differential networks signal.It is straight to be also multiplexed with transmission for these two pair line simultaneously
Flow current signal, i.e., TX+/- with RX+/- between there are one meetings 36~57V DC differential pressure.
After the Signal separator of network transformer, high-frequency signal continue to be transferred to TPTX+/- and TXRX+/-, direct current letter
It number is picked out from transformer center tap, final equipment can take electric current away from 36 liang of POE in figure 12 and POE.Common mode electricity
The position placed is felt according to demand usually there are two position, i.e. the left and right side of network transformer (places common mode inductance in Fig. 3
Position may be with network transformer on same pcb board, it is also possible on different pcb boards.In the present invention, common mode
Inductance is arranged between network transformer and network interface, that is, the right side of network transformer in figure 3 is arranged.It should be pointed out that this
Place's schematic diagram only represents electric connecting mode, does not represent practical layout.
When traditional common mode inductance is placed on the right side of Fig. 3 network transformers, when working in the case where POE powers, by band
Carry out two problems：
1. galvanization is too big in inductance coiling, being lost and generating heat on line will become very serious；
2. high current will cause inductance to be saturated, the ability of suppression common mode signal reduces.
1 can be realized by thickening coil in above-mentioned two problems, and 2 are usually realized by increasing magnetic core.
And increasing the mode of magnetic core will cause device size to become larger rapidly in the case that electric current is prodigious, and become larger then can shadow for magnetic core size
Ringing the differential-mode characteristic of application while common mode inductance to common mode inductance on small-size product will also be affected.
Referring to Fig. 4 and Fig. 7, the common mode inductance of the utility model includes a magnetic core 21 and four conducting wires.First conducting wire 221
The first twisted-pair feeder 22 is formed together with being twisted with the second conducting wire 222；Privates 231 and privates 232 form the together with twisting
Two twisted-pair feeders 23.First twisted-pair feeder 22 and the second twisted-pair feeder 23 are wrapped on magnetic core 21.
Any size appropriate, shape and material may be used in magnetic core 21, to adapt to specific application environment.In Fig. 4 institutes
Show in embodiment, magnetic core 21 is magnet ring.In the figure 7 in illustrated embodiment, magnetic core 21 is linear type magnetic core.It is understood that
Magnetic core 21 can also be other suitable shapes.For example, magnetic core 21 can be non-closed annular, i.e. the magnetic core of c-type.But it closes
Magnet ring be preferred technical solution.Using toroidal core, magnetic core closed loop can reduce magnetic leakage, therefore radiate lower.In addition,
Closed magnet ring is conducive to be packaged into square structure, referring to Fig. 5.
First twisted-pair feeder 22 is as the number of turns that the second twisted-pair feeder 23 is wound on the magnetic core 21.In such manner, it is possible to ensure：
In same size of current, the first twisted-pair feeder 22 and the second twisted-pair feeder 23 can generate an equal amount of magnetic in magnetic core 21
?.
The winding direction of first twisted-pair feeder 22 and the second twisted-pair feeder 23 on the magnetic core 21 is arranged so that：In electric current side
To under unanimous circumstances, the magnetic direction that two pairs of twisted-pair feeders generate in the magnetic core 21 is consistent.Current direction is consistent, refer to from
Network interface flows to network transformer, or refers to flowing to network interface from network transformer；All it is to flow to a left side from right side for example, with reference to Fig. 4
Side；All it is to flow to left side from right side or referring to Fig. 7.
In the embodiment shown in fig. 4, magnetic core is magnet ring.The winding side of first twisted-pair feeder and the second twisted-pair feeder on magnet ring
To on the contrary, ensureing current direction consistent (i.e. according to shown in Fig. 4, be from right to left or be from left to right) the case where
Under, the magnetic direction that two pairs of twisted-pair feeders generate in magnet ring is consistent.Mirror symmetry is arranged on the magnet ring.
It should further be appreciated that in Fig. 4, half is covered on first twisted-pair feeder and each leisure magnet ring of the second twisted-pair feeder
Length, wherein the first twisted-pair feeder 22 cover magnet ring the first half, the second twisted-pair feeder 23 cover magnet ring lower half.It needs to refer to
What is gone out is that coverage area can also be covered according to each covering half shown in Fig. 4 in such a way that other are any.
For example, respectively covering one third；Or respectively cover 2/3rds (having overlapping region).
The material of the magnet ring is MnZn alloy, and the size of the magnet ring is：Outer circumference diameter is that 2mm to 4mm (exists
In the range of 2mm to 4mm)；Inner circumferential diameter is 1mm to 2mm；The height of magnet ring is 2mm to 3mm；First twisted-pair feeder is in institute
It is 10 to 20 circles to state the number of turns wound on magnetic core；The thickness of every single line of first twisted-pair feeder and the second twisted-pair feeder is
0.05mm to 0.3mm.In the embodiment shown in fig. 4, magnetic core 21 is magnet ring, and the material of magnet ring is MnZn alloy.Such as preceding institute
It states, the magnetic core of Fig. 4, which is rotated by 360 ° for certain cross section around the center of annulus, is formed by shape.In an alternative embodiment
In, the certain cross sectional is the rectangle that height is more than width.In a specific embodiment, the size of magnet ring is
3.05mm (outer circumference diameter of annulus) * 1.78mm (the inner circumferential diameter of annulus) * 2.54mm (height of annulus).That is, institute
The height for stating the rectangle of certain cross sectional is 2.54mm, width 0.635mm.The number of turns of coiling is that 13 circles are (single on magnetic core
Group twisted-pair feeder).The thickness of coiling is 0.1mm.
In Fig. 4, the winding direction of the first twisted-pair feeder and the second twisted-pair feeder on magnet ring is opposite.In the figure 7, the magnetic core
For linear type magnetic core, first twisted-pair feeder and the second twisted-pair feeder are with identical winding direction from one end of the linear type magnetic core
It is wound to the other end of the linear type magnetic core.That is, the winding side of the first twisted-pair feeder and the second twisted-pair feeder on magnetic core
To identical.To so that, identical in current direction, the magnetic direction that two pairs of twisted-pair feeders generate in magnetic core is consistent.
Advantageously, first twisted-pair feeder and the second twisted-pair feeder are only needing the when of being drawn from magnetic core to terminate multiple twin pass
System, in conducting wire multiple twin, it is 100ohm to keep the differential impedance of first twisted-pair feeder and the second twisted-pair feeder.
Preferably, the common mode inductance is encapsulated as a 8pin foot device, and side setting is another there are four input pin feet
Side exports pin feet there are four being symmetrical arranged.
The utility model also provides a kind of network electronic devices, and the network electronic devices include that POE network interfaces and network become
Depressor is connected with common mode inductance, wherein the common mode inductance is as described above between the POE network interfaces and network transformer
Common mode inductance, wherein the first twisted-pair feeder is for transmitting RX+/- signal；Second twisted-pair feeder is described for transmitting TX+/- signal
There is the DC differential pressure of setting between RX+/- signal and the TX+/- signal.Advantageously, the network electronic devices are simultaneously
Also there is conventional electron port.
In actual use, as shown in fig. 6, sealing in the common mode electricity in the utility model in the differential lines of network signal line
Sense.Common mode inductance 2 is serially connected between network interface 1 and network transformer 3.
In the case where POE network interfaces are 100-M network Ethernet, above-mentioned common mode inductance can be directly used, to be adapted to 100,000,000 nets
Mouthful.In the case where the POE network interfaces are gigabit network interface, since gigabit signal generally comprises four pairs of twisted-pair feeders, it is therefore desirable to make
The quantity of common mode inductance is two.
In one alternate embodiment, common mode inductance 2 is arranged in network transformer 3 on same pcb board.At another
In alternative embodiment, common mode inductance 2 is not arranged in network transformer 3 on same pcb board, for example, can be by common mode inductance 2
It is arranged on network interface, or is arranged on an individual mounting plate.
Two pairs of twisted-pair feeders are arranged in the common mode inductance of the utility model on the same magnetic core, and by two pairs of twisted-pair feeders described
The direction and the number of turns wound on magnetic core is arranged so that in the case of same current, two pairs of twisted-pair feeders generate on the magnetic core
Identical magnetic field.Increase inductance as a result, avoids common mode inductance from causing inductance to be saturated in the case where POE powers high current, and improve inhibition
The ability of common-mode signal, and allow to using the smaller magnetic core of size.
The functional promotion that the utility model is brought is as follows.In the application of POE, the electric current on the first twisted-pair feeder and second pair
The size of current same direction on twisted wire is on the contrary, therefore the total current on common mode inductance is 0, i.e., in the application of POE, electric current
Increase the diameter for only needing to increase the conducting wire used, and without increasing magnetic core, therefore the design can use the magnetic core of very little to meet
The application of super-large current POE.The common mode inductance of the utility model can be used in inhibiting the network interface common-mode signal of network electronic devices,
It has been compatible with the high current POE application models of network electronic devices simultaneously, product miniaturization, product E MI have been inhibited, high current POE
Product E MI controls etc. all make great sense.
It is last it is to be noted that：Above example is only to illustrate the technical solution of the utility model, rather than limits it
System.It will be understood by those of ordinary skill in the art that：Can with technical scheme described in the above embodiments is modified, or
Person's equivalent replacement of some of the technical features；These modifications or replacements do not make the essence of corresponding technical solution de-
Spirit and scope from various embodiments of the utility model technical solution.
Claims (12)
1. a kind of common mode inductance, which is characterized in that the common mode inductance includes that a magnetic core and two are wrapped on the magnetic core
Twisted-pair feeder；The number of turns that first twisted-pair feeder and the second twisted-pair feeder are wound on the magnetic core is identical, and its winding direction is set as
So that：Under current direction unanimous circumstances, the magnetic direction that two twisted-pair feeders generate in the magnetic core is consistent.
2. common mode inductance as described in claim 1, which is characterized in that the magnetic core is magnet ring.
3. common mode inductance as claimed in claim 2, which is characterized in that first twisted-pair feeder and the second twisted-pair feeder are on magnet ring
Winding direction on the contrary, and on the magnet ring mirror symmetry be arranged.
4. common mode inductance as claimed in claim 3, which is characterized in that first twisted-pair feeder and each comfortable institute of the second twisted-pair feeder
State the length that half is covered on magnet ring.
5. common mode inductance as described in claim 1, which is characterized in that the magnetic core is linear type magnetic core, first multiple twin
Line and the second twisted-pair feeder are another from the one ends wound of the linear type magnetic core to the linear type magnetic core with identical winding direction
One end.
6. the common mode inductance as described in any one of claim 1-5, which is characterized in that first twisted-pair feeder and the second multiple twin
Line is only needing the when of being drawn from magnetic core to terminate multiple twin relationship, in conducting wire multiple twin, keep first twisted-pair feeder and
The differential impedance of second twisted-pair feeder is 100ohm.
7. the common mode inductance as described in any one of claim 1-5, which is characterized in that the common mode inductance is encapsulated as one
8pin foot devices, side setting is there are four pin feet are inputted, and the other side is arranged symmetrically, and there are four export pin feet.
8. the common mode inductance as described in any one of claim 2-4, which is characterized in that the material of the magnet ring is closed for MnZn
Gold, and the size of the magnet ring is：Outer circumference diameter is 2-4mm；Inner circumferential diameter is 1mm-2mm；The height of magnet ring is 2mm to 3mm；
The number of turns that first twisted-pair feeder is wound on the magnetic core is 10 to 20 circles；First twisted-pair feeder and the second twisted-pair feeder it is every
The thickness of root single line is 0.05mm to 0.3mm.
9. common mode inductance as claimed in claim 8, which is characterized in that the size of the magnet ring is：Outer circumference diameter=3.05mm；
Inner circumferential diameter=1.78mm；Height=2.54mm of magnet ring；The number of turns that first twisted-pair feeder is wound on the magnetic core is 13
Circle；The thickness of every single line of first twisted-pair feeder and the second twisted-pair feeder is 0.1mm.
10. a kind of network electronic devices, which is characterized in that including POE network interfaces and network transformer, in the POE network interfaces and net
It is connected with common mode inductance between network transformer, wherein the common mode inductance is common mode as claimed in any one of claims 1-9 wherein
Inductance, wherein the first twisted-pair feeder is for transmitting RX+/- signal；Second twisted-pair feeder is for transmitting TX+/- signal.
11. network electronic devices as claimed in claim 10, which is characterized in that the POE network interfaces are gigabit network interface, and described
The quantity of common mode inductance is two.
12. the network electronic devices as described in claim 10 or 11, which is characterized in that the common mode inductance becomes with the network
Depressor is arranged on same pcb board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820361340.0U CN208093288U (en) | 2018-03-16 | 2018-03-16 | A kind of common mode inductance and the network electronic devices with it |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820361340.0U CN208093288U (en) | 2018-03-16 | 2018-03-16 | A kind of common mode inductance and the network electronic devices with it |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109509624A (en) * | 2019-01-04 | 2019-03-22 | 绵阳高新区鸿强科技有限公司 | A kind of network transformation magnetic core coil and preparation method thereof |
| CN112242607A (en) * | 2019-07-17 | 2021-01-19 | 深圳市通用测试系统有限公司 | Transmission cable and electronic device |
-
2018
- 2018-03-16 CN CN201820361340.0U patent/CN208093288U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109509624A (en) * | 2019-01-04 | 2019-03-22 | 绵阳高新区鸿强科技有限公司 | A kind of network transformation magnetic core coil and preparation method thereof |
| CN112242607A (en) * | 2019-07-17 | 2021-01-19 | 深圳市通用测试系统有限公司 | Transmission cable and electronic device |
| CN112242607B (en) * | 2019-07-17 | 2024-04-30 | 深圳市通用测试系统有限公司 | Transmission cable and electronic device |
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