TWM629236U - Transmission circuit for ethernet - Google Patents

Abstract

A transmission circuit for Ethernet includes four sub-circuits, a high-voltage capacitor and a first capacitor. The first capacitor is coupled to the ground, and a voltage source. Each sub-circuit is coupled between an Ethernet connection device and an Ethernet PHY device, and includes a transformer, a first resistor and a second resistor. The transformer includes two windings, both ends of the first winding being coupled to the Ethernet PHY device, and both ends of the second winding being coupled to the Ethernet connection device. The first winding includes a center tap coupled to the voltage source and the first capacitor. Both the first and second resistors are coupled to the Ethernet connection device, the first resistor being coupled between the first end of the second winding and the high-voltage capacitor, and the second resistor being coupled between the second end of the second winding and the high-voltage capacitor.

Description

Transmission circuit for ethernet

The present invention relates to a transmission circuit used in an Ethernet network. More specifically, the novel Ethernet transmission circuit can replace the traditional Ethernet transformer, and provide functions of signal coupling, DC isolation and surge protection for Ethernet transmission.

The traditional network transformer used in Ethernet network (hereinafter referred to as "Ethernet network transformer") uses capacitors as the main component of DC isolation (for example: Taiwan Patent No. I533640). Although this has the advantages of low manufacturing cost and automatic production, the isolation provided by this Ethernet transformer for the primary side and the secondary side is only about 10 to 100 volts, which is difficult to meet the needs of users for high isolation. Withstand voltage (eg: 1000 volts) needs. In view of this, how to provide an Ethernet network transmission circuit capable of providing high isolation and withstand voltage to replace the traditional Ethernet network transformer is an urgent problem to be solved in the technical field to which the present invention belongs.

In order to solve at least the above-mentioned problems, the present invention discloses a transmission circuit for an Ethernet network. The transmission circuit includes a first capacitor, a second capacitor and four transmission sub-circuits. A withstand voltage value of the first capacitor is not less than 1000 volts. A first end of the second capacitor is coupled to ground. A second end of the second capacitor is coupled to a voltage source. Each of the transmission sub-circuits is coupled between an Ethernet connection device and a current-driven Ethernet physical layer device, and is used for transmitting a pair of differential mode signals of the Ethernet. Each of the transmission sub-circuits includes a transformer, a first resistor and a second resistor. The transformer includes a first winding and a second winding. Both ends of the first winding are coupled to the Ethernet physical layer device, and both ends of the second winding are coupled to the Ethernet connection device. The first winding includes a center tap, and the center tap is coupled to the voltage source and the second capacitor. The first resistor and the second resistor are both coupled to the Ethernet connection device, and the first resistor is coupled between a first end of the second winding and the first capacitor, the second resistor is coupled between a second end of the second winding and the first capacitor.

In order to solve at least the above problems, the present invention also discloses another transmission circuit for an Ethernet network. The transmission circuit includes four transmission sub-circuits and a first capacitor. A withstand voltage value of the first capacitor is not less than 1000 volts. Each of the transmission sub-circuits is coupled between an Ethernet connection device and an Ethernet physical layer device of a voltage-driven type, and is used for transmitting a pair of differential mode signals of the Ethernet. Each of the transmission sub-circuits includes a transformer, a first resistor and a second resistor. The transformer includes a first winding and a second winding. Both ends of the first winding are coupled to the Ethernet physical layer device, and both ends of the second winding are coupled to the Ethernet connection device. Both the first resistor and the second resistor are coupled to the Ethernet connection device. The first resistor is coupled between a first end of the second winding and the first capacitor, and the second resistor is coupled between a second end of the second winding and the first capacitor.

As mentioned above, since the new type of Ethernet transmission circuit uses the transformer as the main component of DC isolation, combined with the special configuration of the components in this new type, the Ethernet transmission circuit can provide a high voltage such as 1000 volts. Isolation withstand voltage. Therefore, the novel Ethernet transmission circuit of the present invention is capable of solving at least the above-mentioned problems in the technical field to which the present disclosure pertains.

The new content generally describes the core concepts of the present disclosure, and covers the technical problems to be solved, the technical means to solve the problems, and the effects of the present disclosure, so as to provide a basic understanding of the present disclosure for those with ordinary knowledge in the technical field to which the present disclosure pertains . It should be understood, however, that this disclosure is not intended to cover all embodiments of the present disclosure. The following paragraphs will describe various embodiments of the present disclosure with accompanying drawings.

The embodiments described below are not intended to limit the invention to any particular environment, application, structure, process, or steps described in these embodiments. In the drawings, elements unrelated to the present invention are not shown. The dimensions and dimensional relationships of individual elements in the figures are merely illustrative examples and are not intended to limit the present invention. In the following description, the same (or similar) reference numerals may correspond to the same (or similar) elements unless otherwise specified.

The terms used herein are for the purpose of describing the embodiments only, and are not intended to limit the invention. The singular form "a" is intended to include the plural form as well, unless the context clearly dictates otherwise. The terms "comprises", "includes" and the like designate the existence of the stated roles, integers, steps, operations and/or elements, but do not exclude the existence of one or more other roles, integers, steps, operations, elements and/or combinations thereof or add. The term "and/or" includes any and all combinations of one or more of the associated listed items. Although the terms "first," "second," "third," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Thus, for example, a first element described below can also be referred to as a second element without departing from the spirit and scope of the present invention.

1-3 are schematic diagrams of an embodiment of the novel Ethernet transmission circuit. More specifically, the novel Ethernet transmission circuit is used to transmit Ethernet signals between an Ethernet physical (PHY) layer device and an Ethernet connection device, as shown in FIG. 1- In each embodiment of FIG. 3 , the transmission circuits 1, 2, and 3 are used to transmit Ethernet signals between an Ethernet physical layer device E11 and an Ethernet connection device E12, and the Ethernet network The physical layer device E11 is a current-driven type (ie, includes a current-driven PHY chip) Ethernet physical layer device. The Ethernet connection device E12 may be an Ethernet connector with an RJ-45 or 8P8C interface.

Referring first to FIG. 1 . A transmission circuit 1 for Ethernet basically includes four groups of transmission sub-circuits 11, 12, 13, 14 and two capacitors C1 and C2, and can be coupled to the Ethernet physical layer devices E11 and B. Ethernet connection between devices E12.

The capacitor C1 can be a high-voltage capacitor, and its capacitance can be 1 nanofarad (nF) to 0.1 microfarad (μF). The capacitor C1 can be coupled to a ground terminal G1, and its withstand voltage can vary according to the isolation degree that the user wants to design. For example, the withstand voltage of the capacitor C1 may not be lower than 1000 volts, so as to provide a ground isolation effect of more than 1000 volts. In some embodiments, the ground terminal G1 may be in the form of chassis ground.

The capacitor C2 can be a multilayer capacitor for providing voltage regulation and filtering functions of the bias source, and its capacitance can be between 1 nanofarad and 1 microfarad (eg, 0.1 microfarad). A first terminal of the capacitor C2 can be coupled to a ground terminal G2. A second end of the capacitor C2 can be coupled to a voltage source VCC. The voltage source VCC can be used to provide a voltage of strength such as, but not limited to, 2.5 volts, 3.3 volts, and the like.

Since the signals transmitted in the Ethernet network are generally designed to be transmitted through eight wires, the eight signals in the eight wires can be equally divided into four differential mode signal pairs, and the transmission sub-circuits 11 and 12 , 13 and 14 can respectively correspond to one of the four differential mode signal pairs. The transmission sub-circuits 11, 12, 13, and 14 have substantially the same structure, and their respective input and output types are also similar. Therefore, based on the principle of simplification of description, except for specific differences that will be described separately, the transmission sub-circuit 11 is only used as an example for description herein. Those with ordinary knowledge in the technical field to which the present invention pertains can understand the corresponding structures and functions of the transmission sub-circuits 12 , 13 and 14 and the applicable parameters/set values of each element according to the description of the transmission sub-circuit 11 . Therefore, the same details will not be repeated here.

The transmission sub-circuit 11 can process a set of Ethernet signals transmitted between the Ethernet physical layer device E11 and the Ethernet connection device E12. Since the transmission sub-circuits 12 , 13 , and 14 have substantially the same structure as the transmission sub-circuit 11 , those skilled in the art to which the present invention pertains can understand the transmission sub-circuits 12 , 13 , and 14 according to the description of the transmission sub-circuit 11 . How to process the other three sets of Ethernet network signals between the Ethernet physical layer device E11 and the Ethernet connection device E12 through the same operation as the transmission sub-circuit 11 . Therefore, the same details will not be repeated here.

The transmission sub-circuit 11 may include a transformer T11 to provide the functions of DC isolation and signal coupling. The transformer T11 may include two windings CL11 and CL12. Both ends of the winding CL11 can be coupled to the Ethernet physical layer device E11, and both ends of the winding CL12 can be coupled to the Ethernet connection device E12. In some embodiments, transformer T11 may be a 1:1 transformer. Furthermore, in some embodiments, the inductance value of the transformer T11 may be between 60 microhenry (μH) and 1 millihenry (mH).

The winding CL11 may have a center tap coupled to the second terminal of the capacitor C2 and the voltage source VCC. In other words, the transformer T11 may have a single-sided tap. Since the center tap is set at one end of the Ethernet physical layer device E11, the voltage source VCC can provide a bias voltage for the PHY chip of the Ethernet physical layer device E11 through the secondary side winding CL11.

In addition to the transformer T11, the transmission sub-circuit 11 may further include two resistors R11 and R12, which may be coupled to the Ethernet connection device E12. The resistor R11 can be coupled between a first end of the winding CL12 and the capacitor C1. The resistor R12 can be coupled between a second end of the winding CL12 and the capacitor C1. The resistors R11 and R12 and the capacitor C1 can be used to provide the ground reference of the signal, so as to avoid the problem of signal level shift caused by the floating of the output end of the transformer T11, and can provide differential mode impedance matching for the signal at the same time. In some embodiments, the resistance values of resistors R11 and R12 may each be between 100 ohms (Ohm) and 50,000 ohms.

In some embodiments, an additional common mode inductor may be added to each transmission sub-circuit as required to provide additional common mode filtering effect. The common mode inductance can be set on the primary side or the secondary side of the transformer T11. FIG. 2 shows an embodiment in which the common mode inductance is disposed on the secondary side of the transformer T11 , and FIG. 3 shows an embodiment in which the common mode inductance is disposed on the primary side of the transformer T11 .

More specifically, reference is first made to FIG. 2 . Similar to the transmission circuit 1, a transmission circuit 2 for Ethernet may also include four transmission sub-circuits 21, 22, 23, 24, a capacitor C1 and a capacitor C2, and the transmission sub-circuits 21, 22, 23, 24 The structure of the transmission sub-circuits 22, 23 and 24 is also substantially the same, so those with ordinary knowledge in the technical field to which the present invention belongs can also understand the corresponding structures, functions and applicable parameters of each element in the transmission sub-circuits 22, 23 and 24 according to the description of the transmission sub-circuit 21. /settings, and how the transmission sub-circuits 22, 23, 24 handle the other three sets of Ethernet between the Ethernet physical layer device E11 and the Ethernet connection device E12 by operating in the same way as the transmission sub-circuit 21 network signal. Therefore, the same details will not be repeated here.

The transmission sub-circuit 21 is derived from the transmission sub-circuit 11. The difference between the two is that the transmission sub-circuit 21 includes a common mode inductance CM1 in addition to the transformer T11, the resistor R11 and the resistor R12 to provide the transmission sub-circuit 21 with additional common mode filtering effect. The common mode inductor CM1 may be coupled between the Ethernet physical layer device E11 and the two ends of the winding CL11. More specifically, one end of the two windings on the common mode inductor CM1 can be coupled to the two ends of the winding CL11 , and the other end of the two windings can be coupled to the Ethernet physical layer device E11 . In other words, the two ends of the winding CL11 can be coupled to the Ethernet physical layer device E11 through the common mode inductor CM1.

Referring next to FIG. 3 . Similar to the transmission circuit 1, a transmission circuit 3 for Ethernet may also include four transmission sub-circuits 31, 32, 33, 34, a capacitor C1 and a capacitor C2, and the transmission sub-circuits 31, 32, 33, 34 The structure of the transmission sub-circuits 32, 33 and 34 is also substantially the same, so those with ordinary knowledge in the technical field to which the present invention belongs can also understand the corresponding structures, functions and applicable parameters of each element in the transmission sub-circuits 32, 33 and 34 according to the description of the transmission sub-circuit 31. /settings, and how the transmission sub-circuits 32, 33, 34 handle the other three sets of Ethernet between the Ethernet physical layer device E11 and the Ethernet connection device E12 by operating in the same manner as the transmission sub-circuit 31 network signal. Therefore, the same details will not be repeated here.

The transmission sub-circuit 31 is derived from the transmission sub-circuit 11. The difference between the two is that the transmission sub-circuit 31 includes a common mode inductance CM1 in addition to the transformer T11, the resistor R11 and the resistor R12 to provide the transmission sub-circuit 31 with additional common mode filtering effect. The common mode inductor CM1 can be coupled between the two ends of the winding CL12 and the Ethernet connection device E12. More specifically, one end of the two windings on the common mode inductor CM1 can be respectively coupled to the resistor R11 and the resistor R12, and jointly coupled to the Ethernet connection device E12, and the other ends of the two windings can be respectively is coupled to both ends of the winding CL12. That is, the two ends of the winding CL12 can be respectively coupled to the Ethernet connection device E12 through the common mode inductance CM1, so that the signal from the Ethernet connection device E12 is transmitted to the transformer T11 through the common mode inductance CM1 .

FIG. 4 is a schematic diagram of another embodiment of the novel Ethernet transmission circuit. More specifically, as mentioned above, the novel Ethernet transmission circuit of the present invention is used to transmit Ethernet signals between the Ethernet physical layer equipment and the Ethernet connection equipment. In an embodiment, the transmission circuit 4 is used for transmitting Ethernet signals between an Ethernet physical layer device E21 and an Ethernet connection device E22, and the Ethernet physical layer device E21 is of a voltage-driven type. (ie, an Ethernet physical layer device that includes a voltage-driven PHY chip). The Ethernet connection device E22 is the same as the Ethernet connection device E12, and can be an Ethernet connector with an RJ-45 or 8P8C interface.

Referring to Figure 4. The transmission circuit 4 for the Ethernet can basically include four groups of transmission sub-circuits 41, 42, 43, 44 and the same capacitor C1 as the transmission circuits 1, 2, 3, and can be coupled to the Ethernet Between the physical layer device E21 and the Ethernet network connection device E22.

As mentioned earlier, since the signals transmitted in the Ethernet network are generally designed to be transmitted through eight wires, the eight signals in the eight wires can be equally divided into four differential mode signal pairs, and the transmission The sub-circuits 41 , 42 , 43 and 44 can respectively correspond to one of the four differential mode signal pairs. The transmission sub-circuits 41, 42, 43, and 44 have substantially the same structure, and their respective input and output types are also similar. Therefore, based on the principle of simplification of the description, except for the specific differences that will be described separately, only the transmission sub-circuit 41 is used as an example for description herein. Those with ordinary knowledge in the technical field to which the present invention pertains can understand the corresponding structures and functions of the transmission sub-circuits 42 , 43 , and 44 and the applicable parameters/set values of each element according to the description of the transmission sub-circuit 41 . Therefore, the same details will not be repeated here.

The transmission sub-circuit 41 can process a group of Ethernet signals transmitted between the Ethernet physical layer device E21 and the Ethernet connection device E22. Since the transmission sub-circuits 42 , 43 , and 44 have substantially the same structure as the transmission sub-circuit 41 , those skilled in the art to which the present invention pertains can understand the transmission sub-circuits 42 , 43 , and 44 according to the description of the transmission sub-circuit 41 . How to process the other three sets of Ethernet signals between the Ethernet physical layer device E21 and the Ethernet connection device E22 through the same operation as the transmission sub-circuit 41 . Therefore, the same details will not be repeated here.

The transmission sub-circuit 41 may include a transformer T21 to provide the functions of DC isolation and signal coupling. The transformer T21 may include two windings CL21 and CL22. Both ends of the winding CL21 can be coupled to the Ethernet physical layer device E21, and both ends of the winding CL22 can be coupled to the Ethernet connection device E22. In some embodiments, transformer T11 may be a 1:1 transformer. Furthermore, in some embodiments, the inductance value of the transformer T11 may be between 60 microhenry and 1 millihenry.

Since the PHY chip of the Ethernet physical layer device E21 is a voltage-driven type, it is not necessary to provide bias to the PHY chip of the Ethernet physical layer device through a center tap as in the transmission circuits 1, 2, and 3. pressure. Therefore, the transformer T21 differs from the transformer T11 in that the winding CL21 may be a coil without a center tap.

In addition to the transformer T21, the transmission sub-circuit 41 may also include the same two resistors R11 and R12 as the transmission sub-circuits 11, 21, and 31, which may be coupled to the Ethernet connection device E22. The resistor R11 can be coupled between a first end of the winding CL22 and the capacitor C1. The resistor R12 can be coupled between a second end of the winding CL22 and the capacitor C1. The resistor R11, the resistor R12 and the capacitor C1 can be used to provide the ground reference of the signal, so as to avoid the problem of signal level shift caused by the floating of the output end of the transformer T21, and can provide differential mode impedance matching for the signal at the same time. In some embodiments, the resistance values of resistor R11 and resistor R12 may each be between 100 ohms and 50,000 ohms.

Although various embodiments are disclosed herein, the present invention is not limited to these embodiments. Equivalents or methods of the above-described embodiments (eg, modifications and/or combinations of the above-described embodiments) are also part of the present disclosure without departing from the spirit and scope of the present disclosure. The protection scope of this new model shall be subject to the content defined by the scope of the patent application.

As follows: 1, 2, 3, 4: Transmission circuit 11, 12, 13, 14, 21, 22, 23, 24, 31, 32, 33, 34, 41, 42, 43, 44: Transmission subcircuits E11, E21: Ethernet physical layer equipment E22, E22: Ethernet connection device C1, C2: Capacitor CL11, CL12, CL21, CL22: Winding CM1: Common Mode Inductance G1, G2: ground terminal R11, R12: resistance T11, T21: Transformer VCC: voltage source

1-4 are schematic diagrams of an embodiment of a transmission circuit for an Ethernet network of the present invention.

1: Transmission circuit

11, 12, 13, 14: Transmission subcircuits

E11: Ethernet physical layer device

E12: Ethernet connection device

C1, C2: Capacitor

CL11, CL12: Winding

G1, G2: ground terminal

R11, R12: resistance

T11: Transformer

VCC: voltage source

Claims (13)

A transmission circuit for an Ethernet network, comprising: a first capacitor, a withstand voltage value of the first capacitor is not less than 1000 volts; a second capacitor, one end of the second capacitor is coupled to the ground, and the other end of the second capacitor is coupled to a voltage source; and Four transmission sub-circuits, each of which is coupled between an Ethernet connection device and a current-driven Ethernet physical layer device, and each of the transmission sub-circuits is used to transmit Ethernet A pair of differential mode signals of the network, and each of the transmission sub-circuits includes: a transformer including a first winding and a second winding, both ends of the first winding are coupled to the Ethernet physical layer device, and both ends of the second winding are coupled to the Ethernet connection apparatus, wherein the first winding includes a center tap, and the center tap is coupled to the voltage source and the second capacitor; and A first resistor and a second resistor are both coupled to the Ethernet connection device, and the first resistor is coupled between the first end of the second winding and the first capacitor, the second resistor is coupled between the second end of the second winding and the first capacitor. The transmission circuit of claim 1, wherein each of the transmission sub-circuits further comprises a common mode inductor coupled between the Ethernet physical layer device and the two ends of the first winding, and the first winding Both ends of the are coupled to the Ethernet physical layer device through the common mode inductor. The transmission circuit of claim 1, wherein each of the transmission sub-circuits further comprises a common mode inductor coupled to the two ends of the second winding, the Ethernet connection device, the first resistor and the second A resistor is provided, and the two ends of the second winding are respectively coupled to the Ethernet connection device through the common mode inductance. The transmission circuit of claim 1, wherein a capacitance value of the second capacitor is between 1 nanofarad and 1 microfarad. The transmission circuit of claim 1, wherein a resistance value of the first resistor and the second resistor is both between 100 ohms and 50,000 ohms. The transmission circuit of claim 1, wherein a capacitance value of the first capacitor is between 1 nanofarad and 0.1 microfarad. The transmission circuit of claim 1, wherein the transformer in each of the transmission sub-circuits is a 1:1 transformer. The transmission circuit of claim 1, wherein an inductance value of the transformer in each of the transmission sub-circuits is between 60 microhenry and 1 millihenry. A transmission circuit for an Ethernet network, comprising: a first capacitor, a withstand voltage value of the first capacitor is not less than 1000 volts; and Four transmission sub-circuits, each of which is coupled between an Ethernet connection device and a voltage-driven Ethernet physical layer device, and each of the transmission sub-circuits is used to transmit Ethernet A pair of differential mode signals of the network, and each of the transmission sub-circuits includes: a transformer including a first winding and a second winding, both ends of the first winding are coupled to the Ethernet physical layer device, and both ends of the second winding are coupled to the Ethernet connection equipment; and A first resistor and a second resistor are both coupled to the Ethernet connection device, and the first resistor is coupled between a first end of the second winding and the first capacitor, the second The resistor is coupled between a second end of the second winding and the first capacitor. The transmission circuit of claim 9, wherein the transformer in each of the transmission sub-circuits is a 1:1 transformer. The transmission circuit of claim 9, wherein an inductance value of the transformer in each of the transmission sub-circuits is between 60 microhenry and 1 millihenry. The transmission circuit of claim 9, wherein a resistance value of the first resistor and the second resistor is both between 100 ohms and 50,000 ohms. The transmission circuit of claim 9, wherein a capacitance value of the first capacitor is between 1 nanofarad and 0.1 microfarad.

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