CN219643916U - Device, system and electronic equipment for transmitting power based on differential signal lines - Google Patents

Abstract

The utility model relates to a device, a system and electronic equipment for transmitting power based on differential signal lines, wherein the device comprises: the device comprises differential signal lines, a common mode interference filtering circuit for filtering common mode interference signals in signals output by a transceiver, a direct current bias voltage filtering circuit for filtering direct current bias voltages in the signals output by the common mode interference filtering circuit, a power supply circuit for supplying power to the two differential signal lines, a power coupling circuit for coupling the power supplied by the power supply circuit to the differential signal lines, an impedance matching circuit for reducing reflection of the signals output by the direct current bias voltage filtering circuit, and a connector electrically connected with the differential signal lines and used for electrically connecting the device with the outside. The device can transmit data and power, and the quality of the transmitted signal is good.

Description

Device, system and electronic equipment for transmitting power based on differential signal lines

Technical Field

The present utility model relates to the field of communications, and in particular, to a device, a system, and an electronic device for transmitting power based on differential signal lines.

Background

With the increasing number of electronic products, people often need to have more wires to perform different functions, such as data lines for data transmission in daily life, and wires that can be charged/powered. When people use certain electronic equipment and need to transmit data, the data wire is required to be matched with the electronic equipment separately, and when people use the electronic equipment and need to charge by being matched with another wire separately, the use experience of people on electronic products can be greatly influenced. Therefore, in daily life of people, a device capable of realizing both data communication and power transmission is required in many places, so that the number of transmission wires is reduced, and the use of users is also facilitated.

However, the signal quality of the device that can realize both the data communication and the power transmission functions in the prior art is so poor that the quality and effect of the communication are affected, especially when the distance of the communication is larger, the quality of the signal transmitted by the device is worse.

For example, when music is played through speakers in an automobile, in order to achieve better audio playback, a plurality of speakers are often disposed at a plurality of different places in the automobile to achieve better stereo sound effects. In the prior art, the vehicle body of the vehicle is usually communicated with each loudspeaker through a communication device, however, loads such as the loudspeakers also need to be continuously powered, so that the communication device is required to transmit data and power. However, the distance between the plurality of speakers and the vehicle machine is long, so that more and longer transmission wires are needed in the vehicle to realize the functions, and the quality of the signals output by the speakers is poor.

In view of the above, there is a need for a device that can transmit both data and power with good quality of the transmitted signals.

Disclosure of Invention

In view of the above, the present utility model provides a device for transmitting power based on differential signal lines, so as to achieve that both data and power can be transmitted and the quality of the transmitted signal is better.

The utility model provides a device for transmitting power based on differential signal lines, which comprises: the device comprises two differential signal lines, a common mode interference filtering circuit for filtering common mode interference signals in signals output by a transceiver, a direct current bias voltage filtering circuit for filtering direct current bias voltages in the signals output by the common mode interference filtering circuit, a power supply circuit for supplying power to the two differential signal lines, a power coupling circuit for coupling the power supplied by the power supply circuit to the differential signal lines, an impedance matching circuit for reducing reflection of the signals output by the direct current bias voltage filtering circuit, and a connector electrically connected with the differential signal lines and used for electrically connecting the device with the outside; the common mode interference filtering circuit is connected between the transceiver and the differential signal line; the input end of the direct-current bias voltage filtering circuit is connected with the output end of the common-mode interference filtering circuit, and the output ends of the direct-current bias voltage filtering circuit are respectively connected with the two differential signal lines; the impedance matching circuit includes: the first capacitor C1, the second capacitor C2, the third capacitor C3, the first resistor R1 and the second resistor R2 are sequentially connected in series between the two differential signal lines, the connection point of the first capacitor C1 and the second capacitor C2 is connected with one end of the first resistor R1, the other end of the first resistor R1 is grounded, the connection point of the second capacitor C2 and the third capacitor C3 is connected with one end of the second resistor R2, and the other end of the second resistor R2 is grounded; the two differential signal lines are electrically connected with the power supply circuit through the power coupling circuit.

In an embodiment, the capacitance of the second capacitor C2 is picofarads, and the capacitance of the first capacitor C1 and the capacitance of the third capacitor C3 are nanofarads.

In one embodiment, the device further comprises a twisted pair electrically connected to the connector for communication with the outside world.

In an embodiment, the common mode interference filtering circuit is a transformer or a common mode choke or an inductor.

In an embodiment, the dc bias voltage filtering circuit includes a fourth capacitor C4 and a fifth capacitor C5, one end of the fourth capacitor C4 is electrically connected to the output end of the common mode interference filtering circuit, and the other end of the fourth capacitor C4 is electrically connected to one of the two differential signal lines; one end of the fifth capacitor C5 is electrically connected to the output end of the common mode interference filtering circuit, and the other end of the fifth capacitor C5 is electrically connected to the other one of the two differential signal lines.

In an embodiment, the device further includes a second-stage common-mode interference filtering circuit for filtering common-mode interference signals in signals output by the direct-current bias voltage filtering circuit, where the second-stage common-mode interference filtering circuit is connected between the direct-current bias voltage filtering circuit and the differential signal line.

In an embodiment, the filter circuit further includes a filter circuit for filtering out a high-frequency common-mode interference signal, the filter circuit includes a first inductor L1, a second inductor L2, a sixth capacitor C6, and a seventh capacitor C7, the first inductor L1 and the sixth capacitor C6 are connected in series and then connected between one differential line of the two differential signal lines and the ground, and the second inductor L2 and the seventh capacitor C7 are connected in series and then connected between the other differential line of the two differential signal lines and the ground.

In an embodiment, the power coupling circuit comprises: a third inductance L3 electrically connected between one of the two differential signal lines and the power supply circuit, and a fourth inductance L4 electrically connected between the other of the two differential signal lines and the power supply circuit.

The utility model also provides a system for transmitting power based on the differential signal line, which comprises: the device for transmitting power based on the differential signal line is any one of the devices.

The utility model also provides electronic equipment comprising any one of the devices or any one of the systems.

The device for transmitting power based on the differential signal line can transmit power and data through the differential signal line, the power supply circuit and the power coupling circuit, and the common-mode interference signal and the direct-current bias voltage in signals from a transceiver are filtered out sequentially through the common-mode interference filtering circuit and the direct-current bias voltage filtering circuit, and the signal output by the direct-current bias voltage filtering circuit can be effectively reduced to reflect through the impedance matching circuit connected on the differential signal line behind the direct-current bias voltage filtering circuit, so that the quality of the signals transmitted by the device is better improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a prior art configuration of an automobile interior machine in combination with a speaker;

FIG. 2 is a schematic diagram of the device provided by the utility model in a vehicle, and matched with a vehicle machine and a loudspeaker;

fig. 3 is a schematic diagram of a device for transmitting power based on differential signal lines according to the present utility model;

fig. 4 is a schematic circuit diagram of an apparatus for transmitting power based on differential signal lines according to an embodiment of the present utility model;

FIG. 5 is a schematic circuit diagram of a system formed by a device according to an embodiment of the present utility model;

in the figure:

20. a transceiver; 10. means for transmitting power based on the differential signal lines;

11. a common mode interference filtering circuit; 12. a DC bias voltage filtering circuit;

13. a connector; 14. a power coupling circuit; 15. a power supply circuit;

16. an impedance matching circuit; 17. differential signal lines;

18. twisted pair wires; 21. a second stage common mode interference filtering circuit;

31. and a third-stage common mode interference filtering circuit.

Detailed Description

For a better understanding of the objects, technical solutions and advantages of the present utility model, reference should be made to the various exemplary embodiments described hereinafter with reference to the accompanying drawings, which form a part hereof, and in which are described various exemplary embodiments which may be employed in practicing the present utility model. The same reference numbers in different drawings identify the same or similar elements unless expressly stated otherwise. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. It is to be understood that they are merely examples of processes, methods, apparatuses, etc. that are consistent with certain aspects of the present disclosure as detailed in the appended claims, other embodiments may be utilized, or structural and functional modifications may be made to the embodiments set forth herein without departing from the scope and spirit of the present disclosure.

In the description of the present utility model, it should be understood that the terms "center," "longitudinal," "transverse," and the like are used in an orientation or positional relationship based on that shown in the drawings, and are merely for convenience in describing the present utility model and to simplify the description, rather than to indicate or imply that the elements referred to must have a particular orientation, be constructed and operate in a particular orientation. The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "plurality" means two or more. The terms "connected," "coupled" and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, communicatively connected, directly connected, indirectly connected via intermediaries, or may be in communication with each other between two elements or in an interaction relationship between the two elements. The term "and/or" includes any and all combinations of one or more of the associated listed items. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In order to illustrate the technical solutions of the present utility model, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the following description, for the purpose of providing a thorough understanding of the present utility model, detailed structures and steps are presented in order to illustrate the technical solution presented by the present utility model. Preferred embodiments of the present utility model are described in detail below, however, the present utility model may have other embodiments in addition to these detailed descriptions.

The utility model provides a device for transmitting power based on a differential signal line, which can be widely applied to various products which can transmit data and can provide power, such as electronic equipment of automobiles, sound equipment, conference room systems, airplanes and the like, so as to realize the transmission of power through a data line. That is, the wires that transmit data may also transmit power. The device provided by the utility model is used for transmitting power based on the differential signal wires, namely, the device has the functions of transmitting data and transmitting power through two differential wires. Therefore, only two wires are needed in the device provided by the utility model, for example, when the device is used for transmitting data, two differential signal wires are respectively connected with the positive electrode signal end D+ and the negative electrode signal end D-; when it is used for transmitting power, one of the two differential signal lines is connected to VCC and the other is grounded GND, so that power transmission can be realized.

It should be noted that, the principle and the technical scheme of the device for transmitting power based on the differential signal line are completely different from those of the device for supporting data transmission and power transmission through four lines in the prior art. For example, in daily life, data interaction between a computer and a mobile phone can be realized through one data line, and charging of the mobile phone through the computer can also be realized through the data line, however, the inside of the shell cladding of the data line essentially comprises four independent wires, wherein the four wires are respectively and independently connected with VCC, D-, D+, and GND, namely, two wires for connecting D+ and D-in the four wires are independently used for transmitting data only, and two wires for connecting VCC and GND in the four wires are independently used for transmitting power only, and the two wires are respectively and independently operated. However, the two differential lines in the device provided by the utility model are used for transmitting data and for transmitting power. Therefore, the working principle, the working mode and the application scene of the device provided by the utility model are completely different from those of the prior art.

The application scenario and influence of the device provided by the utility model are illustrated below in connection with an automobile. In an automobile, the automobile machine needs to communicate with a plurality of speakers and microphones to achieve data and power transmission.

Fig. 1 and fig. 2 show a schematic diagram of a structure for performing information interaction between a vehicle interior and a plurality of speakers in a vehicle in the prior art, and fig. 2 shows a schematic diagram of a structure for performing information interaction between a vehicle interior and a plurality of speakers in a vehicle, in which the device for transmitting power based on differential signal lines is used for the vehicle. The transceiver system in the figure refers to a transceiver for transmitting signals, a device for transmitting power based on a differential signal line, which is connected with the transceiver for transmitting signals, provided by the utility model, a transceiver for receiving signals, and a device for transmitting power based on a differential signal line, which is electrically connected with the transceiver for receiving signals, wherein the two devices for transmitting power based on the differential signal line can be electrically connected through a twisted pair. As can be seen from the figure, the device provided by the utility model can realize data transmission and power transmission, and meanwhile, the required wiring is obviously shorter and less than that of the prior art, and the signals required to be processed by the vehicle machine are fewer, so that the energy consumption of the vehicle can be correspondingly reduced.

As shown in fig. 3 to 5, fig. 3 is a schematic diagram of a frame of an apparatus for transmitting power based on differential signal lines, which may be used for communication of signals transmitted/received by a transceiver (or other devices having a function of receiving/transmitting signals), the apparatus 10 for transmitting power based on differential signal lines according to the present utility model at least includes: two differential signal lines 17 which can be used for transmitting both data and power; the common mode interference filtering circuit 11 is connected between the transceiver and the differential signal line 17 and is used for filtering common mode interference signals in signals output by the transceiver; a dc bias voltage filter circuit 12 for filtering the dc bias voltage in the signal output from the common mode interference filter circuit; a power supply circuit 15 for supplying power to the two differential signal lines 17; a power coupling circuit 14 for coupling the power supplied from the power supply circuit 15 to the differential signal line 17; an impedance matching circuit 16 for reducing reflection of the signal output from the dc bias voltage filtering circuit 12; further comprising a connector 13 electrically connected to the differential signal line 17 for electrically connecting the differential signal line based power transmission device 10 to the outside. The common mode interference filtering circuit 11 is connected between the transceiver and the differential signal line 17; the input end of the direct-current bias voltage filtering circuit 12 is connected with the output end of the common-mode interference filtering circuit 11, and the output ends of the direct-current bias voltage filtering circuit 12 are respectively connected with the two differential signal lines 17. The two differential signal lines 17 are electrically connected to the power supply circuit 15 through the power coupling circuit 14.

Wherein the signal output by the transceiver can be communicated with the outside through the device. The device is typically implemented on a PCB, preferably the transceiver is a chip that can transmit and receive data. The common mode interference filtering circuit 11 electrically connected with the transceiver eliminates the common mode interference signal in the signal output by the transceiver so that the useful differential mode signal passes through, and the device can transmit the data output by the transceiver. For example, common mode interference signals due to differences of devices, asymmetry of differential wiring and increase of through holes on a PCB, coupling of external environments and the like can be filtered. Further, the output end of the common mode interference filtering circuit 11 is electrically connected to the dc bias voltage filtering circuit 12 to block the dc bias voltage and allow the differential useful data to pass through in a coupled manner. Further, the power supply circuit 15 couples power to the two differential signal lines 17 through the power coupling circuit 14. The power supply circuit 15 typically provides a dc voltage, and the power coupling circuit 14 has a function of passing the dc voltage while blocking the differential signal from passing, thereby enabling the dc voltage to be coupled to the two differential signal lines 17. The impedance matching circuit 16 is integrally connected between the two differential signal lines 17 in a bridging manner, and the impedance matching circuit 16 has the functions of impedance matching, optimizing signal reflection and filtering Gao Pincha mode interference signals. The impedance matching circuit 16 includes: the first capacitor C1, the second capacitor C2, the third capacitor C3, the first resistor R1 and the second resistor R2, where the first capacitor C1, the second capacitor C2 and the third capacitor C3 are sequentially connected in series between the two differential signal lines 17, a connection point between the first capacitor C1 and the second capacitor C2 is connected with one end of the first resistor R1, the other end of the first resistor R1 is grounded, a connection point between the second capacitor C2 and the third capacitor C3 is connected with one end of the second resistor R2, and the other end of the second resistor R2 is grounded. When the frequency reaches a certain requirement, an RC circuit formed by R1 and C5 is formed; in the RC circuit formed by R2 and C7, the impedance is almost the resistance of R1 and R2, and the RC circuit plays a role in resistance matching. That is, the first capacitor C1, the second capacitor C2, the third capacitor C3, the first resistor R1, and the second resistor R2 can make the impedance of the circuit in front of the impedance matching circuit 16 and the impedance of the circuit in back thereof match, so as to reduce or avoid interference caused by signal reflection, and further improve the quality of data or power transmitted by the differential signal line 17. After the two differential signal lines 17 are connected with the outside through the connector 13, the device provided by the utility model can be communicated with the outside, and the device provided by the utility model can be used for transmitting data and power, and can be used for transmitting signals with less interference, so that high-quality communication is realized.

Referring to fig. 4 and fig. 5, fig. 4 is a schematic circuit diagram of a device for transmitting power based on a differential signal line 17 in a preferred embodiment provided by the present utility model, which is equivalent to a transmitting end including a function of transmitting power, and fig. 5 is a schematic circuit diagram of a device for transmitting power based on a differential signal line 17 in a preferred embodiment provided by the present utility model applied to an entire transceiver system (including a transmitting end and a receiving end). Preferably, the common mode interference filtering circuit 11 is a transformer or a common mode choke or an inductor, and has simple circuit structure, can better filter common mode interference signals and has lower cost. In the preferred embodiment, the common mode interference filtering circuit 11 is a common mode choke coil having the same windings, the windings of which have the same polarity and have large common mode impedance, so that the common mode interference noise can be removed well, and the windings of which have the same polarity and have low differential mode impedance between the two ports, so that the differential data can pass freely. Moreover, it may also support the use of conventional twisted pair wires 18 in noisy environments rather than the more expensive shielded cables. In the impedance matching circuit 16, the capacitance of the second capacitor C2 is preferably much smaller than the capacitance of the first capacitor C1, and the capacitance of the second capacitor C2 is preferably much smaller than the capacitance of the third capacitor C3. The impedance matching circuit 16 can greatly reduce the reflection of signals, optimize the impedance matching well, and filter the high-frequency differential mode interference uploaded by the lead through the middle second capacitor C2 and eliminate the common mode interference signals well. More preferably, the capacitance value of the second capacitor C2 is picofarads, and the capacitance values of the first capacitor C1 and the third capacitor C3 are nanofarads, which has very small impedance to high frequency. As is known from capacitance=1/(2pi fC), when the capacitance is fixed, the higher the frequency, the smaller the obstruction of the signal passing through the capacitance, thereby improving the quality of signal transmission.

Still more preferably, the device for transmitting power based on differential signal lines provided by the present utility model further includes a twisted pair wire 18 electrically connected to the connector 13 for communicating the device with the outside. Therefore, the device has lower cost, can support signal transmission for a longer distance while providing better quality signals, and further has more application scenes and better application experience.

The dc bias voltage filtering circuit 12 may filter the dc bias voltage by using various circuits, and preferably, the dc bias voltage filtering circuit 12 includes a fourth capacitor C4 and a fifth capacitor C5, one end of the fourth capacitor C4 is electrically connected to the output end of the common mode interference filtering circuit 11, and the other end of the fourth capacitor C4 is electrically connected to one of the two differential signal lines 17; one end of the fifth capacitor C5 is electrically connected to the output end of the common mode interference filtering circuit 11, and the other end of the fifth capacitor C5 is electrically connected to the other of the two differential signal lines 17. The circuit has simple structure, lower cost and less interference influence on the whole device.

In addition, in order to better filter the common mode interference signal in the device, the device for transmitting power based on the differential signal line provided by the present utility model may include two or more stages of common mode interference filtering circuits, for example, in the preferred embodiment shown in fig. 4, in addition to the common mode interference filtering circuit 11 connected between the transceiver and the dc bias voltage filtering circuit 12, the device further includes: the two-stage common-mode interference filtering circuit, namely the second-stage common-mode interference filtering circuit 21 (namely the common-mode inductance) and the third-stage common-mode interference filtering circuit 31 in the figure, are connected between the direct-current bias voltage filtering circuit 12 and the differential signal line 17, and the other end of the third-stage common-mode interference filtering circuit 31 is electrically connected with the differential signal line 17. The two stages are combined in the above way to strengthen the filtering of the common mode interference signal and enable the differential data signal to pass freely. The high frequency common mode interference signal is coupled to ground by L1 and C6 and L2 and C7 for absorption. It is further preferred that a filter circuit is also included which can further remove common mode interference signals, in particular for filtering out high frequency common mode interference signals. In a preferred embodiment, the filter circuit includes a first inductor L1, a second inductor L2, a sixth capacitor C6, and a seventh capacitor C7, wherein the first inductor L1 and the third capacitor C3 are connected in series and then connected across one of the two differential signal lines 17 and the ground, and the second inductor L2 and the fourth capacitor C4 are connected in series and then connected across the other of the two differential signal lines 17 and the ground. Therefore, the device has the advantages of cleaner transmitted signals, better signal quality and better user experience. And the circuit has simple structure and lower cost.

Preferably, the power coupling circuit 14 includes: a third inductance L3 electrically connected between one of the two differential signal lines 17 and the power supply circuit 15, and a fourth inductance L4 electrically connected between the other of the two differential signal lines 17 and the power supply circuit 15. That is, one of the differential signal lines 17 is electrically connected to the power supply circuit through the inductance L3, and the other of the differential signal lines 17 is electrically connected to the power supply circuit through the inductance L4. Such a power coupling circuit 14 has fewer components, a simple circuit structure, and low cost, and can couple the electric power output from the power supply circuit 15 to the differential signal line 17 with less interference.

The device for transmitting power based on the differential signal line can reduce the inconsistency of devices, self noise, self loss and environmental interference, and can also reduce the influence of common mode interference and high-frequency differential mode interference on data errors on transmission conductors caused by various reasons such as PCB wiring, so that applied electronic equipment can work better and stably in complex environments, and has faster working frequency and longer transmission distance.

The device for transmitting power based on the differential signal line provided by the utility model can be suitable for a transmitting end of a signal and can be similarly suitable for a receiving end of the signal, as shown in fig. 5, the receiving end of the signal can be identical except for a power supply circuit 15 and a power receiving circuit, and the circuits of the receiving end and the transmitting end are mirror images. The power supply circuit 15 in fig. 5 couples the DC voltage via two inductive devices L3, L4 to a differential line, which is a length of PCB trace between the third stage common mode interference filtering circuit (common mode inductance in the figure) and the connector 13 in fig. 5. The third inductor L3 and the fourth inductor L4 have the effect of allowing a DC voltage and current to flow therethrough, thereby blocking the differential signal from passing therethrough. The impedance matching circuit 16 has the functions of impedance matching, optimizing signal reflection, and filtering Gao Pincha mode interference signals. The capacitance of the capacitor C2 is much smaller than the capacitance of the capacitor C1, and the capacitance of the capacitor C2 is much smaller than the capacitance of the capacitor C3. Preferably, the capacitance value of the second capacitor C2 is picofarads, the capacitance values of the first capacitor C1 and the third capacitor C3 are nanofarads, and further the impedance matching circuit has very small impedance to high frequency.

The common mode interference filtering circuit can eliminate common mode interference signals. The direct current bias voltage filtering circuit formed by the fourth capacitor C4 and the fifth capacitor C5 mainly enables differential useful data to be coupled and pass through, and cuts off the direct current bias voltage. Therefore, the upper device (corresponding to the transmitting end) in fig. 5 can communicate data with the lower device (corresponding to the receiving end) through the twisted pair 18, and the communication quality is better and the communication distance is longer. Referring to fig. 2 again, the device provided by the utility model can realize communication with a distance of more than ten meters after being combined with the twisted pair 18, and can realize communication in more and more distant places in an automobile, for example, sound equipment can be arranged in more and more distant places in the automobile, and audio data communication can be realized, so that the use experience of a user is improved, and data and power can be transmitted, so that the user is not influenced by the corresponding power deficiency.

The utility model also provides a system for transmitting power based on differential signal lines, the system comprising: the device may be the device for transmitting power based on the differential signal line. The utility model also provides electronic equipment comprising the device or the system. For example, the electronic device is an automobile, or a sound, or a conference system, etc.

In summary, the device for transmitting power based on the differential signal line provided by the utility model not only supports data transmission but also supports power supply based on the differential signal line, and the transmitted signal has better quality, and the device has a simple integral structure and lower cost, and can greatly facilitate the use of electronic products by users and greatly improve the user experience.

The foregoing embodiments of the present utility model are not limited to the above embodiments, but are intended to be included within the scope of the present utility model as defined by the appended claims and their equivalents.

In addition, the present utility model may be identified by the same or different reference numerals for structural elements having the same or similar characteristics. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, the word "e.g." is used to mean "serving as an example, instance, or illustration". Any embodiment described as "for example" in this disclosure is not necessarily to be construed as preferred or advantageous over other embodiments. The previous description is provided to enable any person skilled in the art to make or use the present utility model. In the above description, various details are set forth for purposes of explanation.

It will be apparent to one of ordinary skill in the art that the present utility model may be practiced without these specific details. In other instances, well-known structures and processes have not been shown in detail to avoid unnecessarily obscuring the description of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

Claims (10)

1. An apparatus for transmitting power based on differential signal lines, comprising: the device comprises two differential signal lines, a common mode interference filtering circuit for filtering common mode interference signals in signals output by a transceiver, a direct current bias voltage filtering circuit for filtering direct current bias voltages in the signals output by the common mode interference filtering circuit, a power supply circuit for supplying power to the two differential signal lines, a power coupling circuit for coupling the power supplied by the power supply circuit to the differential signal lines, an impedance matching circuit for reducing reflection of the signals output by the direct current bias voltage filtering circuit, and a connector electrically connected with the differential signal lines and used for electrically connecting the device with the outside;

the common mode interference filtering circuit is connected between the transceiver and the differential signal line;

the input end of the direct-current bias voltage filtering circuit is connected with the output end of the common-mode interference filtering circuit, and the output ends of the direct-current bias voltage filtering circuit are respectively connected with the two differential signal lines;

the impedance matching circuit includes: the first capacitor C1, the second capacitor C2, the third capacitor C3, the first resistor R1 and the second resistor R2 are sequentially connected in series between the two differential signal lines, the connection point of the first capacitor C1 and the second capacitor C2 is connected with one end of the first resistor R1, the other end of the first resistor R1 is grounded, the connection point of the second capacitor C2 and the third capacitor C3 is connected with one end of the second resistor R2, and the other end of the second resistor R2 is grounded;

the two differential signal lines are electrically connected with the power supply circuit through the power coupling circuit.

2. The device of claim 1, wherein the second capacitor C2 has a picofarad level, and the first capacitor C1 and the third capacitor C3 have a nanofarad level.

3. The device of claim 2, further comprising a twisted pair electrically connected to the connector for communication with the outside world.

4. The apparatus of claim 2, wherein the common mode interference rejection circuit is a transformer or a common mode choke or an inductor.

5. The apparatus of claim 4, wherein the dc bias voltage filtering circuit comprises a fourth capacitor C4 and a fifth capacitor C5, one end of the fourth capacitor C4 is electrically connected to the output terminal of the common mode interference filtering circuit, and the other end of the fourth capacitor C4 is electrically connected to one of the two differential signal lines; one end of the fifth capacitor C5 is electrically connected to the output end of the common mode interference filtering circuit, and the other end of the fifth capacitor C5 is electrically connected to the other one of the two differential signal lines.

6. The apparatus of any one of claims 1 to 5, further comprising a secondary common mode rejection circuit for rejecting common mode interference signals in signals output by the dc offset voltage rejection circuit, the secondary common mode rejection circuit being connected between the dc offset voltage rejection circuit and the differential signal line.

7. The apparatus of any one of claims 1 to 5, further comprising a filter circuit for filtering out high-frequency common-mode interference signals, wherein the filter circuit includes a first inductor L1, a second inductor L2, a sixth capacitor C6, and a seventh capacitor C7, the first inductor L1 and the sixth capacitor C6 are connected in series and then connected across one of the two differential signal lines and ground, and the second inductor L2 and the seventh capacitor C7 are connected in series and then connected across the other of the two differential signal lines and ground.

8. The apparatus of any one of claims 1 to 5, wherein the power coupling circuit comprises: a third inductance L3 electrically connected between one of the two differential signal lines and the power supply circuit, and a fourth inductance L4 electrically connected between the other of the two differential signal lines and the power supply circuit.

9. A system for transmitting power based on differential signal lines, comprising: a transceiver, and a differential signal line-based power transmission device electrically connected to the transceiver, the differential signal line-based power transmission device being the device according to any one of claims 1 to 8.

10. An electronic device, comprising: the device of any one of claims 1 to 8 or the system of claim 9.