CN115172022A - Inductance device and Ethernet port circuit - Google Patents
Inductance device and Ethernet port circuit Download PDFInfo
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- CN115172022A CN115172022A CN202110368993.8A CN202110368993A CN115172022A CN 115172022 A CN115172022 A CN 115172022A CN 202110368993 A CN202110368993 A CN 202110368993A CN 115172022 A CN115172022 A CN 115172022A
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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
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
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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
- H01F27/24—Magnetic cores
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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
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
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Abstract
The embodiment of the application discloses an inductance device which can be applied to an Ethernet port. The inductance device comprises a first winding, a second winding, a third winding and a fourth winding, wherein the first winding and the second winding are connected in series, the first winding and the second winding are connected between the third winding and the fourth winding in a bridging mode, and the connection position of the first winding and the second winding is grounded. The inductance device can realize the function of the network transformer through four groups of windings, and the cost of the network transformer is saved.
Description
Technical Field
The embodiment of the application relates to the field of communication, in particular to an inductance device and an Ethernet port circuit.
Background
In the communication field, an ethernet port is one of the most reused interfaces of communication equipment, and is used for electric signal transmission between the equipment, for example, a PC used by us has an internet port, a home Wi-Fi router has an internet port, and a smart television has an internet port.
The ethernet port circuit is usually composed of 3 main components, namely an ethernet PHY chip, a network transformer and a network port connector (RJ 45), and is a core component of the ethernet port circuit. The network transformer generally comprises a circuit formed by 1 patch common-mode inductor, 1 patch self-coupling inductor and 1 patch ceramic capacitor, wherein the common-mode inductor realizes a common-mode rejection effect, the patch ceramic capacitor realizes isolation of a local direct-current component and a far-end direct-current component of a network port differential signal, and the self-coupling inductor realizes a protection function.
Because the existing network transformer has many discrete devices, including a plurality of surface mounted devices such as self-coupling inductors, ceramic capacitors, common mode inductors and the like, the circuit is complex, and the cost is high.
Disclosure of Invention
The embodiment of the application provides an inductance device and an Ethernet port circuit, which can be used for an Ethernet port and can realize the conditioning, the protection and the isolation and the EMI suppression of Ethernet electric signals.
A first aspect of the present application provides an inductive device, comprising:
the first winding and the second winding are connected in series, the first winding and the second winding are connected between the third winding and the fourth winding in a bridging mode, and the connection position of the first winding and the second winding is grounded.
In the embodiment of the application, the first winding and the second winding are connected in series, and the first winding and the second winding are bridged between the third winding and the fourth winding, so that the common mode rejection effect and the self-coupling inductance effect are realized, devices are reduced, and the cost and the overall size are reduced.
Based on the inductance device described in the first aspect, in a possible implementation manner, one end of the first winding is connected to the second pin, the other end of the first winding is connected to the fifth pin, one end of the second winding is connected to the first pin, the other end of the second winding is connected to the fifth pin, one end of the third winding is connected to the first pin, the other end of the third winding is connected to the fourth pin, one end of the fourth winding is connected to the second pin, the other end of the fourth winding is connected to the third pin, the first winding and the second winding are used for achieving a function of the self-coupling inductance, and the third winding and the fourth winding are used for achieving a function of the common-mode inductance.
In the embodiment of the application, compared with the prior art, 33% of pin devices are reduced, and the cost is saved.
Based on the inductance device described in the first aspect, in a possible implementation manner, the inductance device further includes a first flange, a second flange, and a magnetic core, the first flange includes a third pin, a fifth pin, and a fourth pin, the second flange includes a second pin and a first pin, the first flange and the second flange are respectively connected to two ends of the magnetic core, the first winding, the second winding, the third winding, and the fourth winding are all disposed on the magnetic core, and the fifth pin is grounded.
In the embodiment of the application, the inductance device adopts the single magnetic core and the double flanges, and the total cost of the inductance device is relatively low.
Based on the inductance device described in the first aspect, in a possible implementation manner, the second flange further includes a sixth pin, and the sixth pin is disposed between the second pin and the first pin.
In the embodiment of the application, when the flange is produced on a production line, the first flange and the second flange do not need to be distinguished in advance, and unified production management is facilitated.
Based on the inductance device described in the first aspect, in a possible implementation manner, the inductance device further includes a first capacitor and a second capacitor, the first capacitor is connected to the third pin, and the second capacitor is connected to the fourth pin.
In the embodiment of the application, the inductance device further comprises a first capacitor and a second capacitor, so that the realizability of the scheme is improved.
Based on the inductance device described in the first aspect, in a possible implementation manner, the inductance device is applied to an ethernet port, the ethernet port further includes an ethernet PHY chip and a port connector RJ45, the ethernet PHY chip is connected to a first capacitor and a second capacitor, and the port connector RJ45 is connected to a first pin and a second pin.
In the embodiment of the application, the Ethernet single-board network port circuit is designed simply, so that the volume of the integral Ethernet port device is reduced.
Based on the inductive device of the first aspect, in one possible implementation manner, a projection area of the inductive device on the printed circuit board PCB is less than or equal to 20 square millimeters.
In the embodiment of the application, when the projection area of the inductance device on the PCB is less than or equal to 20 square millimeters, the whole size is smaller, and the cost is reduced.
A second aspect of the present application provides an ethernet port circuit, including:
the inductive device, the ethernet PHY chip and the network port connector RJ45 are connected, the inductive device is connected with the network port connector RJ45, and the inductive device is any one of the inductive devices in the first aspect.
In the embodiment of the application, the Ethernet single-board network port circuit is designed simply, so that the volume of the integral Ethernet port device is reduced.
According to the technical scheme, the embodiment of the application has the following advantages:
in the embodiment of the application, the first winding and the second winding are connected in series, and the first winding and the second winding are bridged between the third winding and the fourth winding, so that the common mode rejection effect and the self-coupling inductance effect are realized, devices are reduced, and the cost and the overall size are reduced.
Drawings
Fig. 1 is a schematic diagram of an ethernet port framework according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a network transformer in the prior art according to an embodiment of the present application;
FIG. 3 is a comparative circuit diagram of an inductive device according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an inductive device according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an ethernet port according to an embodiment of the present application;
fig. 6 is another schematic structural diagram of an ethernet port according to the embodiment of the present application.
Detailed Description
The embodiment of the application provides an inductance device and an Ethernet port circuit, which can be used for an Ethernet port and can realize the conditioning, the protection and the isolation and the EMI suppression of Ethernet electric signals.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.
Please refer to fig. 1, which is a schematic diagram of an ethernet port framework according to an embodiment of the present disclosure.
The ethernet port is one of the most common interfaces in communication equipment, and is used for electrical signal transmission between equipment, for example, a PC used by us has a network port, a home Wi-Fi router has a network port, an intelligent television has a network port, and a large-scale switch, a backbone router and the like of a complex point all relate to the design of the network port. As shown in fig. 1, an ethernet port circuit is generally composed of three main components, an ethernet PHY chip, a network transformer, and a network port connector (RJ 45). The network transformer is used for conditioning, protecting and isolating Ethernet electric signals and suppressing electromagnetic interference (EMI), and is a core component of a network port circuit.
In the existing technical scheme, the network transformer adopts an integrated network transformer, which is the most mature and widely used scheme at present. The principle of the hundred-mega Ethernet is that the network port signals are transmitted through 2 pairs of differential lines, and the gigabit Ethernet is that the network port signals are transmitted through 4 pairs of differential lines. The plastic package of 1 single-port integrated gigabit network transformer is internally composed of 4 groups of manually wound transformer windings and a common-mode coil. The plastic package of 1 double-port integrated gigabit network transformer is internally composed of 4 groups of transformer windings with manual winding and common-mode coils, namely 1 transformer winding and 1 common-mode coil can complete 1 pair of differential line signal transmission.
However, in the existing network transformer, the winding of the transformer winding and the common mode coil is complex, manual completion is needed, the labor cost is high, and the overall size of the network transformer is large, so that the consistency of electrical indexes is poor, and the electrical indexes can be common mode rejection indexes.
In the existing network transformer, another one is composed of 1 chip common-mode inductor, 1 chip self-coupling inductor and 2 chip ceramic capacitors.
As shown in fig. 2, wherein the chip common mode inductor L1 implements a common mode rejection effect, the chip ceramic capacitor C implements isolation of a local end of a network port differential signal from a far-end direct current component, the chip self-coupling inductor L2 implements a protection function, and the combination of the chip ceramic capacitor C and the chip automatic inductor L2 implements a function of transmitting an electrical signal, wherein the pin1 and the pin4 of the common mode inductor are respectively connected with an ethernet PHY chip, the pin2 and the pin3 are respectively connected with two chip capacitors, the pin1 and the pin3 of the self-coupling inductor are respectively connected with two ports of an RJ45, and the pin2 and the pin4 of the self-coupling inductor are respectively grounded.
However, the scheme has many discrete devices including self-coupling inductors, ceramic capacitors and common-mode inductors, and if a 1-channel gigabit network port circuit needs 12 chip devices, the circuit design is complex and the cost is high.
In order to solve the problems of complex circuit design and high cost, the embodiment of the application provides the inductance device which is relatively simple in circuit design, small in number of the whole surface mounted devices and low in cost.
Referring to fig. 3, a circuit diagram of an inductive device according to an embodiment of the present application is provided.
As shown in fig. 3, the left side of fig. 3 is a circuit diagram of a network transformer in the prior art, and the common-mode inductor L1 and the self-coupled inductor L2 are combined in the scheme of the inductance device provided in the embodiment of the present application. Specifically, PIN2 of the common mode inductor and PIN1 of the self-coupling inductor are merged into PIN2 in the new device on the right side of fig. 3, PIN3 of the common mode inductor and PIN3 of the self-coupling inductor are merged into PIN1 in the new device on the right side of fig. 3, PIN2 and PIN4 of the self-coupling inductor are merged into PIN 5 in the new device on the right side of fig. 3, PIN1 in the common mode inductor is PIN3 in the new device, and PIN4 in the common mode inductor is PIN4 in the new device. Thus, among the inductance devices, an inductance device of a minimum of 5 pins is formed.
In the inductor provided in the embodiment of the present application, the 5 pins are grounded, so that overcurrent protection of the inductor, such as lightning overcurrent, can be realized. The 1 pin and the 2 pins in the inductance device and the 5 pins are equivalent to the function of realizing the self-coupling inductance, namely, the impedance of a signal of a network port is regulated, the impedance matching is realized, in addition, the lightning protection can be realized, and a loop with a short path is formed in the lightning stroke for the lightning protection. The 1 pin, the 2 pin, the 3 pin and the 4 pin in the inductance device realize the function of common mode inductance, namely, the common mode rejection function of noise frequency and noise is realized.
Specifically, please refer to fig. 4, which is a schematic structural diagram of an inductor device according to an embodiment of the present disclosure.
The inductive device shown in fig. 4 comprises a first winding 401, a second winding 402, a third winding 403 and a fourth winding 404, wherein the first winding 401 and the second winding 402 are connected in series, the first winding 401 and the second winding 402 are connected across the third winding 403 and the fourth winding 404, and the connection between the first winding 401 and the second winding 402 is grounded.
Specifically, in one possible implementation manner, as shown in fig. 4, one end of the first winding 401 is connected to the second pin 409, the other end of the first winding 401 is connected to the fifth pin 411, one end of the second winding 402 is connected to the first pin 408, the other end of the second winding 402 is connected to the fifth pin 411, one end of the third winding 403 is connected to the first pin 408, the other end of the third winding 403 is connected to the fourth pin 410, one end of the fourth winding 404 is connected to the second pin 409, the other end of the fourth winding 404 is connected to the third pin 412, and the first winding 401 and the second winding 402 are used for implementing a function of a self-coupled inductor, and the third winding and the fourth winding are used for implementing a function of a common-mode inductor. It is understood that, in the practical application process, the functions of the common mode inductor and the self-coupled inductor may also be implemented by other winding manners, and are not limited herein.
In a possible implementation manner, as shown in fig. 4, the inductance device further includes a first flange 405 and a second flange 406, and a magnetic core 407, on the first flange 405, a third pin 412, a fifth pin 411, and a fourth pin 410 are disposed, on the second flange 406, a second pin 409 and a first pin 408 are disposed, the first flange 405 and the second flange 406 are respectively connected to two ends of the magnetic core 407, and the first winding 401, the second winding 402, the third winding 403, and the fourth winding 404 are disposed on the magnetic core 407, that is, all wound on the magnetic core 407, and the fifth pin 411 is grounded.
In a possible implementation manner, as shown in fig. 4, a sixth pin 413 may be further disposed on the second flange 406, a position of the sixth pin 413 is between the second pin 409 and the first pin 408, and positions of the first pin 408, the second pin 409, and the sixth pin 413 on the second flange 406 correspond to positions of the third pin 412, the fifth pin 411, and the fourth pin 410 on the first flange 405, so that the first flange 405 and the second flange 406 are completely identical, so that when the flange is produced on a production line, it is not necessary to distinguish the first flange from the second flange in advance, which is beneficial to uniform production management. It should be noted that, in an actual application process, the sixth pin 413 may not be needed, and only the first flange and the second flange need to be distinguished in advance when the flanges are produced, which is not limited herein.
In one possible implementation manner, as shown in fig. 5, the inductance device further includes a first capacitor and a second capacitor, and the first capacitor and the second capacitor are both ceramic capacitors, wherein the first capacitor is connected to the third pin, and the second capacitor is connected to the fourth pin. In practical application, the inductor device can be applied to an ethernet port, the ethernet port further includes an ethernet PHY chip and a port connector RJ45, the ethernet PHY chip is connected to the first capacitor and the second capacitor, and the port connector RJ45 is connected to the first pin and the second pin. It should be noted that, the connection manner and the number of the devices are a single group of connection manner and number, and if in a specific application scenario, multiple groups of connection of the inductive devices, the ethernet PHY chip, and the network port connector RJ45 may be required. For example, as shown in fig. 6, under gigabit port requirements, 4 sets of inductive devices and ethernet PHY chips and a port connector RJ45 connection are required.
In one possible implementation, the projected area of the inductive device on a Printed Circuit Board (PCB) is less than or equal to 20 square millimeters, for example, 14.4 square millimeters.
It should be noted that, in an actual application process, the inductance device mentioned in the embodiment of the present application may be a network transformer, or an inductance device in a network transformer, and is not limited herein.
In the embodiment of the application, the single magnetic core and the double flanges are adopted, so that the overall cost of the device is relatively low. And the inductance device and the network interface circuit provided by the embodiment of the application enable the design integration level of the single board to be greatly improved, and the manufacturing cost of the SMT patch to be reduced by 33%. The Ethernet single-board network port circuit provided by the embodiment of the application is simple in design, can be produced by adopting full-automatic devices, is high in yield and good in device index consistency, can reduce the number of devices by 33% compared with the scheme in the prior art, and greatly reduces the size of a PCB (printed circuit board) occupied by the circuit.
The inductance device and the ethernet port circuit provided in the embodiments of the present application are described in detail above, and specific examples are applied herein to explain the principles and embodiments of the present application, and the description of the embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (8)
1. An inductive device, comprising:
the first winding, the second winding, the third winding and the fourth winding;
the first winding and the second winding are connected in series, and the first winding and the second winding are bridged between the third winding and the fourth winding;
the junction of the first winding and the second winding is grounded.
2. The inductor device according to claim 1, wherein one end of the first winding is connected to the second pin, the other end of the first winding is connected to the fifth pin, one end of the second winding is connected to the first pin, the other end of the second winding is connected to the fifth pin, one end of the third winding is connected to the first pin, the other end of the third winding is connected to the fourth pin, one end of the fourth winding is connected to the second pin, the other end of the fourth winding is connected to the third pin, the first winding and the second winding are used for achieving a function of self-coupling inductance, and the third winding and the fourth winding are used for achieving a function of common-mode inductance.
3. The inductor device according to claim 2, further comprising a first flange, a second flange and a magnetic core, wherein the first flange comprises the third pin, the fifth pin and the fourth pin, the second flange comprises the second pin and the first pin, the first flange and the second flange are respectively connected to two ends of the magnetic core, the first winding, the second winding, the third winding and the fourth winding are all disposed on the magnetic core, and the fifth pin is grounded.
4. The inductive device of claim 3, wherein said second flange further comprises sixth leads, said sixth leads disposed between said second leads and said first leads.
5. The inductive device of any of claims 1 to 4 further comprising a first capacitor and a second capacitor, said first capacitor being connected to said third pin and said second capacitor being connected to said fourth pin.
6. The inductive device of claim 5, wherein said inductive device is applied to an ethernet port, said ethernet port further comprising an ethernet PHY chip and a port connector RJ45, said ethernet PHY chip being connected to said first capacitor and said second capacitor, said port connector RJ45 being connected to said first pin and said second pin.
7. An inductive device according to claim 5 or 6, characterized in that the projected area of the inductive device on the printed circuit board PCB is less than or equal to 20 square millimeters.
8. An ethernet port circuit, characterized in that, the ethernet port circuit comprises an inductive device, an ethernet PHY chip and an RJ45 port connector, the ethernet PHY chip is connected with the inductive device, the inductive device is connected with the RJ45 port connector, and the inductive device is the inductive device according to any one of the claims 1 to 7.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110368993.8A CN115172022A (en) | 2021-04-06 | 2021-04-06 | Inductance device and Ethernet port circuit |
| PCT/CN2022/085274 WO2022213971A1 (en) | 2021-04-06 | 2022-04-06 | Inductive device and ethernet interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110368993.8A CN115172022A (en) | 2021-04-06 | 2021-04-06 | Inductance device and Ethernet port circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115172022A true CN115172022A (en) | 2022-10-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110368993.8A Pending CN115172022A (en) | 2021-04-06 | 2021-04-06 | Inductance device and Ethernet port circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115172022A (en) |
| WO (1) | WO2022213971A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2863429B1 (en) * | 2013-10-16 | 2017-06-14 | Telefonaktiebolaget LM Ericsson (publ) | Tunable inductor arrangement, transceiver, method and computer program |
| SE539353C2 (en) * | 2015-11-18 | 2017-07-25 | Optistring Tech Ab | Combined common mode inductor and differential signal transformer |
| CN107946047B (en) * | 2016-10-12 | 2020-04-14 | 赤多尼科两合股份有限公司 | Sandwich winding inductor |
| CN108417359B (en) * | 2018-04-28 | 2024-01-09 | 东莞顺为半导体有限公司 | Common mode network filter and system |
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2021
- 2021-04-06 CN CN202110368993.8A patent/CN115172022A/en active Pending
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2022
- 2022-04-06 WO PCT/CN2022/085274 patent/WO2022213971A1/en active Application Filing
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| WO2022213971A1 (en) | 2022-10-13 |
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