CN114121464A - Transmission circuit for Ethernet - Google Patents
Transmission circuit for Ethernet Download PDFInfo
- Publication number
- CN114121464A CN114121464A CN202111390298.8A CN202111390298A CN114121464A CN 114121464 A CN114121464 A CN 114121464A CN 202111390298 A CN202111390298 A CN 202111390298A CN 114121464 A CN114121464 A CN 114121464A
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- connection point
- coil
- ethernet
- coupled
- transmission
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 112
- 239000003990 capacitor Substances 0.000 claims description 23
- 238000010586 diagram Methods 0.000 description 8
- 238000002955 isolation Methods 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 230000006872 improvement Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
Abstract
A transmission circuit for Ethernet comprises four transmission sub-circuits. Each transmission sub-circuit is coupled between the ethernet physical layer device and the ethernet connection device, includes a first coil, a second coil, a first magnetic core and a transformer, and is configured to transmit a pair of ethernet differential mode signals. The second connection point of the first coil and the third connection point of the second coil are both coupled to the Ethernet connection device. The first connection point of the first coil and the fourth connection point of the second coil are both coupled to the ground terminal. The first coil and the second coil are wound around the first magnetic core in the same direction. The transformer includes a third coil and a fourth coil. The fifth connection point and the sixth connection point of the third coil are coupled to the second connection point and the third connection point, respectively, and both ends of the fourth coil are coupled to the ethernet physical layer device.
Description
Technical Field
The invention relates to a transmission circuit for an Ethernet. More specifically, the ethernet transmission circuit of the present invention can replace the conventional ethernet transformer, and provide the functions of signal coupling, dc isolation and surge protection for ethernet transmission.
Background
The conventional network transformer for ethernet (hereinafter referred to as "ethernet transformer") includes a transformer with a center tap, and therefore, the conventional network transformer needs to be manufactured by manual winding, which results in poor adaptability of the conventional ethernet transformer to capacity variation and relatively high production cost. In addition, the conventional ethernet transformer also has no surge protection function, which often results in the ethernet system not being able to operate effectively in an environment vulnerable to surge interference (e.g. lightning strike, static electricity generation, or power switching with other loads in the circuit), so that the ethernet service has to be interrupted. In view of the above, it is a problem in the art to provide an ethernet transmission circuit capable of being produced in an automated manner and having surge protection capability to replace the conventional ethernet transformer.
Disclosure of Invention
In order to solve at least the above problems, the present invention discloses a transmission circuit for ethernet. The transmission circuit includes four transmission sub-circuits. Each transmission sub-circuit is coupled between the ethernet physical layer device and the ethernet connection device, and each transmission sub-circuit is used for transmitting a pair of differential mode signals of the ethernet. Each of the transmission sub-circuits may include a first coil, a second coil, a first core, and a transformer. In each transmission sub-circuit, two ends of the first coil may respectively include a first connection point and a second connection point, and two ends of the second coil may respectively include a third connection point and a fourth connection point. The second connection point and the third connection point may both be coupled to the ethernet connection device, and the first connection point and the fourth connection point may both be coupled to ground. The first coil and the second coil are wound together around the first magnetic core in the same direction. The transformer may include a third coil and a fourth coil. The third coil may include a fifth connection point and a sixth connection point at both ends thereof, and the fifth connection point and the sixth connection point may be coupled to the second connection point and the third connection point, respectively. Both ends of the fourth coil may be coupled to the ethernet physical layer device.
As a further improvement of the present invention, each of the transmission sub-circuits further includes a fifth coil, a sixth coil and a second magnetic core, the fifth connection point is coupled to the second connection point via the fifth coil, the sixth connection point is coupled to the third connection point via the sixth coil, and the fifth coil and the sixth coil are wound around the second magnetic core together in the same direction.
As a further improvement of the present invention, the present invention further comprises a first capacitor, wherein the first capacitor is coupled to the ground terminal and the first connection point and the fourth connection point of each of the transmission sub-circuits, and the first connection point and the fourth connection point of each of the transmission sub-circuits are coupled to the ground terminal via the first capacitor.
As a further improvement of the present invention, the withstand voltage of the first capacitor is not lower than 500 dc volts.
As a further development of the invention, the capacitance value of the first capacitor is between 1 picofarad and 100 nanofarads.
As a further improvement of the present invention, the inductance value of the transformer in each of the transmission sub-circuits is between 60 microhenries and 1 millihenry.
Compared with the prior art, the invention has the beneficial effects that:
the transmission circuit for the Ethernet is produced without manual winding and other modes, has a structure capable of realizing automatic production, and can provide the functions of signal coupling, direct current isolation, surge protection and the like required by Ethernet transmission; therefore, the Ethernet transmission circuit of the invention has the capability of replacing the traditional Ethernet transformer and providing higher environmental adaptability for the transmission of the Ethernet.
The main objects, technical means and embodiments of the present invention will be understood by those skilled in the art after referring to the accompanying drawings and the embodiments described later.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description, wherein:
FIG. 1 is a schematic diagram of one embodiment of a transmission circuit for Ethernet networks of the present invention;
FIG. 2 is a schematic diagram of one embodiment of a coil winding scheme in the transmission circuit of the present invention; and
fig. 3, 4 and 5 are schematic diagrams of another embodiment of a transmission circuit according to the present invention.
The reference numbers illustrate:
1. 2, 3, 4: transmission circuit
11. 12, 13, 14, 21, 22, 23, 24: transmission sub-circuit
E1: ethernet physical layer equipment
E2: ethernet connection device
C1: capacitor with a capacitor element
CL1, CL2, CL3, CL4, CL5, CL 6: coil
G1: grounding terminal
M1, M2: magnetic core
P1, P2, P3, P4, P5, P6: connection point
T1: transformer device
Detailed Description
The following examples are provided to illustrate the technical content of the present invention and are not intended to limit the scope of the present invention. It should be noted that in the following embodiments and the accompanying drawings, elements irrelevant to the present invention have been omitted and not shown, and the dimensional relationship between the elements in the drawings is only for easy understanding and is not intended to limit the actual scale. As used herein, the terms "first," "second," "third," "fourth," "fifth," "sixth," and the like, as applied to certain elements, are intended to distinguish one element from another, and are not intended to limit the sequential relationship between the elements.
Fig. 1 is a schematic diagram of an embodiment of an ethernet transmission circuit of the present invention. Referring to fig. 1, a transmission circuit 1 for ethernet basically comprises four sets of transmission sub-circuits 11, 12, 13, 14 and can be coupled to a signal source of ethernet (e.g., a Physical (PHY) layer device in ethernet). Since signals transmitted in the ethernet network are generally designed to be transmitted through eight wires, eight signals of the eight wires may be equally divided into four differential-mode signal pairs, and the transmission sub-circuits 11, 12, 13, 14 may respectively correspond to one of the four differential-mode signal pairs. The transmission sub-circuits 11, 12, 13, 14 are substantially identical in structure and the respective input and output types are also similar. Therefore, based on the principle of simplifying the description, the transmission sub-circuit 11 is only used as an example for illustration, but those skilled in the art can understand the corresponding structures, functions and parameters/set values applicable to each element in the transmission sub-circuits 12, 13, 14 according to the description of the transmission sub-circuit 11.
The transmit subcircuit 11 may process a set of ethernet signals transmitted between an ethernet Physical (PHY) layer device E1 and an ethernet connector E2. The ethernet connector E2 may be an ethernet connector with an RJ-45 or 8P8C interface. Since the structures of the transmission sub-circuits 12, 13, and 14 and the transmission sub-circuit 11 are substantially the same, a person skilled in the art can understand how the transmission sub-circuit 12, the transmission sub-circuit 13, and the transmission sub-circuit 14 can process the other three sets of ethernet signals between the ethernet physical layer device E1 and the ethernet connector E2 in the same operation manner as the transmission sub-circuit 11 according to the description of the transmission sub-circuit 11, and the same details will not be described herein again.
The transmission sub-circuit 11 may include a coil CL1, a coil CL2, a magnetic core M1, and a transformer T1. Both ends of the coil CL1 may include a connection point P1 and a connection point P2, respectively, and both ends of the coil CL2 may include a connection point P3 and a connection point P4, respectively. Connection point P2 and connection point P3 may be coupled to ethernet connection device E2. The connection point P1 and the connection point P4 may be coupled to a ground G1. Since the connection point P1 and the connection point P4 in the transmission sub-circuit 11 and the corresponding connection points in the transmission sub-circuit 12, the transmission sub-circuit 13 and the transmission sub-circuit 14 are all short circuits with low frequency to ground, if an inrush current is input from the end of the ethernet connection device E2, the energy thereof can be discharged to ground, thereby achieving the effect of protecting the inrush current. In certain embodiments, connection point P1, connection point P2, connection point P3, and connection point P4 may each be implemented as a single pin.
Fig. 2 is a schematic diagram of an embodiment of a coil winding method in the transmission circuit of the present invention. First, reference is made to fig. 1 and 2 simultaneously. As shown in fig. 2, coil CL1 and coil CL2 are wound around magnetic core M1 together in the same direction (i.e., clockwise or counterclockwise with respect to an axial direction of magnetic core M1).
Transformer T1 may include a coil CL3 and a coil CL4 wound around the same core, and may be of a no center-tap design. The two ends of the coil CL3 may include a connection point P5 and a connection point P6, respectively, and the connection point P5 and the connection point P6 may be coupled to the connection point P2 and the connection point P3, respectively. Both ends of the coil CL4 may be coupled to the ethernet physical layer device E1.
Since the input terminal and the output terminal of the transformer T1 are not directly connected, it can provide the transmission circuit 1 with better dc isolation capability compared to the capacitor-type device, and make the transmission circuit 1 satisfy the 1500 ac volt (Vac) withstand voltage specification defined by the IEEE for the network transformer. In addition, since the transformer T1 may not have a center tap, it may have a process that may be automated as the inductor. In some embodiments, the inductance value of the transformer in each transmit sub-circuit (e.g., transformer T1 in transmit sub-circuit 11) may be between 60 microHenries (uH) and 1 milliHenries (mH).
Fig. 3 is a schematic diagram of another embodiment of the transmission circuit of the present invention, which is derived from the transmission circuit 1 shown in fig. 1. Referring to fig. 1 and 3, a transmission circuit 2 for ethernet may also include transmission sub-circuits 11, 12, 13, and 14, and the components of each transmission sub-circuit and the connection relationship between each transmission sub-circuit and the ethernet physical layer device E1 and the ethernet connection device E2 may be the same as the transmission circuit 1, with the difference that the transmission circuit 2 may further include a capacitor C1. The connection point P1 and the connection point P4 in the transmission sub-circuit 11 and the connection points corresponding to the connection point P1 and the connection point P4 in the transmission sub-circuits 12, 13, 14 may be coupled to the capacitor C1, and the capacitor C1 may be coupled to the ground terminal G1. In other words, the connection point P1, the connection point P4, and the connection point corresponding to the connection point P2 and the connection point P4 of the transmission sub-circuits 12, 13, 14 are coupled to the ground terminal G1 through the capacitor C1.
The capacitor C1 can provide isolation to ground for the transmission circuit 2 to prevent noise from being transmitted back to the signal line from the ground. In some embodiments, ground G1 may be in the form of a chassis ground (chassis ground). In certain embodiments, the capacitance value of capacitor C1 may be between 1 picofarad (pF) and 100 nanofarads (nF), respectively. In some embodiments, the withstand voltage of the capacitor C1 may be designed to be not lower than 500 direct current volts (Vdc) to maintain the differential mode impedance and reduce the cross talk between channels.
Fig. 4 is a schematic diagram of another embodiment of the transmission circuit of the present invention, which is derived from the transmission circuit 1 shown in fig. 1. Referring to fig. 1 and 4, a transmission circuit 3 for ethernet may include four transmission sub-circuits 21, 22, 23, 24 and a capacitor C1, and the structure of the transmission sub-circuits 21, 22, 23, 24 is substantially the same and the respective input and output types are similar as in the transmission circuit 1, so that the detailed description is made herein only for the structure of the transmission sub-circuit 21, and those skilled in the art can clearly understand the corresponding structure and connection configuration of the transmission sub-circuits 22, 23, 24 according to the description about the transmission sub-circuit 21.
Like the transmission sub-circuit 11, the transmission sub-circuit 21 may also include a coil CL1, a coil CL2, a magnetic core M1, and a transformer T1. The transmitter sub-circuit 21 is different from the transmitter sub-circuit 11 in that it may further include a coil CL5, a coil CL6, and a magnetic core M2. Coil CL5 may be coupled between connection point P2 of coil CL1 and connection point P5 of coil CL3, and coil CL6 may be coupled between connection point P3 of coil CL2 and connection point P6 of coil CL 3. In other words, in the coil CL3 of the transmission sub-circuit 21, the connection point P5 may be coupled to the connection point P2 via the coil CL5, and the connection point P6 may be coupled to the connection point P3 via the coil CL 6. Coil CL5 and coil CL6 are wound around magnetic core M2 in the same direction.
Fig. 5 is a schematic diagram of another embodiment of the transmission circuit of the present invention, which is derived from the transmission circuit 2 and the transmission circuit 3 shown in fig. 3 and 4. Referring to fig. 3 and 4, a transmission circuit 4 for ethernet may include transmission sub-circuits 21, 22, 23, and 24 in the transmission circuit 3 in addition to the capacitor C1 in the transmission circuit 2. In other words, the transmission circuit 4 combines the features of the transmission circuit 2 and the transmission circuit 3. By this design, the transmission circuit 4 has both advantages of the transmission circuit 2 and the transmission circuit 3 to provide further common mode filtering protection and impedance matching. Since the detailed structure of the transmission sub-circuits 21, 22, 23, and 24 in the transmission circuit 4 can be known by those skilled in the art according to the description of the transmission circuit 3, the detailed description is omitted.
Similar to the transmission circuit 2, in the transmission circuit 4, the connection point P1 and the connection point P4 in the transmission sub-circuit 21 and the connection points corresponding to the connection point P1 and the connection point P4 in the transmission sub-circuits 22, 23, and 24 can be coupled to the capacitor C1, and the capacitor C1 can be coupled to the ground terminal G1. In other words, the connection point P2, the connection point P4, and the connection point of the transmission sub-circuits 22, 23, and 24 corresponding to the connection point P1 and the connection point P4 are coupled to the ground terminal G1 through the capacitor C1.
In summary, the transmission circuits 1, 2, 3, and 4 for ethernet in the present invention need not be produced by manual wire winding, have a structure capable of automatic production, and provide the functions of signal coupling, dc isolation, surge protection, and the like required for ethernet transmission. Therefore, the ethernet transmission circuit of the present invention is capable of replacing the conventional ethernet transformer and providing a higher environmental adaptability for ethernet transmission.
The above examples are only for illustrating the embodiments of the present invention and illustrating the technical features of the present invention, and are not intended to limit the scope of the present invention. Any modification or equivalent arrangement which can be readily devised by those skilled in the art is intended to be within the scope of the present invention, which is to be determined by the claims.
Claims (6)
1. A transmission circuit for an ethernet network, comprising:
four transmission sub-circuits, each of which is coupled between an ethernet physical layer device and an ethernet connection device, each of which is configured to transmit a pair of differential mode signals of an ethernet network, and each of which includes:
the two ends of the first coil respectively comprise a first connection point and a second connection point, the two ends of the second coil respectively comprise a third connection point and a fourth connection point, the second connection point and the third connection point are both coupled to the Ethernet connection equipment, and the first connection point and the fourth connection point are both coupled to a ground terminal;
a first magnetic core, wherein the first coil and the second coil are co-wound around the first magnetic core in the same direction; and
a transformer including a third coil and a fourth coil, wherein two ends of the third coil respectively include a fifth connection point and a sixth connection point, the fifth connection point and the sixth connection point are respectively coupled to the second connection point and the third connection point, and two ends of the fourth coil are coupled to the ethernet physical layer device.
2. The transmission circuit of claim 1, wherein each of the transmission sub-circuits further comprises a fifth coil, a sixth coil, and a second magnetic core, the fifth connection point is coupled to the second connection point via the fifth coil, the sixth connection point is coupled to the third connection point via the sixth coil, and the fifth coil and the sixth coil are co-wound around the second magnetic core in the same direction.
3. The transmission circuit according to claim 1 or 2, further comprising a first capacitor coupled to the ground terminal and the first connection point and the fourth connection point in each of the transmission sub-circuits, and wherein the first connection point and the fourth connection point in each of the transmission sub-circuits are coupled to the ground terminal via the first capacitor.
4. The transmission circuit according to claim 3, wherein a withstand voltage of the first capacitor is not lower than 500 DC volts.
5. The transmission circuit of claim 3, wherein the first capacitor has a capacitance value between 1 picofarad and 100 nanofarads.
6. The transmission circuit of claim 1, wherein an inductance value of the transformer in each of the transmission sub-circuits is between 60 microhenries and 1 millihenry.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW110212758U TWM625463U (en) | 2021-10-29 | 2021-10-29 | Transmission circuit for ethernet |
| TW110212758 | 2021-10-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114121464A true CN114121464A (en) | 2022-03-01 |
Family
ID=80439432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111390298.8A Pending CN114121464A (en) | 2021-10-29 | 2021-11-23 | Transmission circuit for Ethernet |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114121464A (en) |
| TW (1) | TWM625463U (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386619A (en) * | 2011-12-05 | 2012-03-21 | 黄兴英 | Circuit for inhibiting interference signal and carrying out surge protection |
| CN103532814A (en) * | 2012-07-06 | 2014-01-22 | 乾坤科技股份有限公司 | Network communication device |
| CN203775228U (en) * | 2014-02-21 | 2014-08-13 | 弘邺科技有限公司 | Lightning protection network signal processing circuit |
| CN106340761A (en) * | 2015-07-10 | 2017-01-18 | 富士康(昆山)电脑接插件有限公司 | Network interface circuit and network interface connector using same |
| CN111901012A (en) * | 2020-07-23 | 2020-11-06 | 深圳市奥拓电子股份有限公司 | Ethernet communication module and electronic system for simultaneously transmitting two signals |
-
2021
- 2021-10-29 TW TW110212758U patent/TWM625463U/en unknown
- 2021-11-23 CN CN202111390298.8A patent/CN114121464A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386619A (en) * | 2011-12-05 | 2012-03-21 | 黄兴英 | Circuit for inhibiting interference signal and carrying out surge protection |
| CN103532814A (en) * | 2012-07-06 | 2014-01-22 | 乾坤科技股份有限公司 | Network communication device |
| CN203775228U (en) * | 2014-02-21 | 2014-08-13 | 弘邺科技有限公司 | Lightning protection network signal processing circuit |
| CN106340761A (en) * | 2015-07-10 | 2017-01-18 | 富士康(昆山)电脑接插件有限公司 | Network interface circuit and network interface connector using same |
| CN111901012A (en) * | 2020-07-23 | 2020-11-06 | 深圳市奥拓电子股份有限公司 | Ethernet communication module and electronic system for simultaneously transmitting two signals |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM625463U (en) | 2022-04-11 |
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Inventor after: Lin Minfa Inventor before: Lin Minfan |