WO2015169059A1

WO2015169059A1 - Signal transmission system

Info

Publication number: WO2015169059A1
Application number: PCT/CN2014/089083
Authority: WO
Inventors: 张秋杰; 鬲莉
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-05-09
Filing date: 2014-10-21
Publication date: 2015-11-12
Also published as: CN203933616U

Abstract

Disclosed is a signal transmission system, specifically comprising: a modulation-demodulation device and an electric power transmission device, wherein the modulation-demodulation device is connected to the electric power transmission device through an anti-signal-interference wideband signal transmission line; the modulation-demodulation device is used for modulating an input wideband signal to a wideband signal suitable for transmitting on the wideband signal transmission line and transmitting the modulated wideband signal to the electric power transmission device through the wideband signal transmission line; and the electric power transmission device is used for transmitting the received wideband signal to an external apparatus. The signal transmission system of the present utility model can solve the problem of mutual interference of a plurality of paths of power line signals when being transmitted on a wideband signal transmission line.

Description

Signal transmission system

Technical field

The utility model relates to the field of broadband power line communication, in particular to a signal transmission system.

Background technique

With the rapid development of communication technology, broadband power line communication has been widely used, and it utilizes the existing power network to realize network communication with power line as a new type of information transmission medium. Through the power line transmission bearer in the building, the user's wireless broadband access is completed. Through broadband power line communication technology, operators can easily use existing power lines to solve the problem that transmission lines that are often encountered during network deployment cannot be connected to the home, adapt to local conditions, improve networking flexibility, and reduce construction costs. How to couple signals to the power line for transmission is an important part of power line broadband communication. There are various ways of coupling signals to power lines in the prior art, for example, Chinese patent application "Power Carrier Communication Coupling Device" with patent application number CN200720083413.6, and Chinese patent application "CN200520000119" for three-phase power supply "Line PLC signal coupling circuit", and the international patent application "SYSTEM AND COUPLING CIRCUIT FOR POWER LINE" of the patent application No. WO9750190A1; these patents all propose the manner of coupling a signal to a power line.

However, in the prior art, multiple power line signals have mutual crosstalk when transmitting at the same time, which seriously affects the throughput of the system. For example, in a building including multiple layers, each layer of the modem device demodulates the broadband signal input from the outside of the building, and then couples the broadband signal to the power line for transmission to the user. In the case where the power line is connected to the socket, the user You can use the modem to connect to the socket to access the Internet. However, each layer in the building uses a power line to transmit broadband signals, which will cause signal interference between each layer of power lines.

At present, there is no specific problem in the prior art to solve the problem that the multi-channel power line signals interfere with each other during transmission. For example, the Chinese patent application "CN-phase application line PLC signal coupling circuit" of the patent application No. CN200520000119, and the patent application number is WO9750190A1. The patent application "SYSTEM AND COUPLING CIRCUIT FOR POWER LINE" has the problem of mutual interference of multiple power line signals and no corresponding solution has been proposed.

Utility model content

The main technical problem to be solved by the utility model is to provide a signal transmission system which can solve the problem that multiple power line signals interfere with each other during transmission.

In order to solve the above technical problem, the present invention provides a signal transmission system, including: a modem device and a power transmission device;

The modem device and the power transmission device are connected by a broadband signal transmission line that prevents signal interference;

The modem device modulates the input wideband signal to a wideband signal suitable for transmission on the broadband signal transmission line and transmits the modulated wideband signal to the power transmission device through the broadband signal transmission line;

The power transmission device transmits the received broadband signal to an external device.

Preferably, the power transmission device includes: a signal conversion module and a first power line; the signal conversion module converts the modulated wideband signal into a broadband signal suitable for the first power line, by the first power line Broadband signals are transmitted to external devices.

In one embodiment, the power transmission device further includes: a first power access device, the first power access device is connected to the first power line, and the first power line transmits the broadband signal to A power access device is transmitted to the external device by the first power access device.

In another embodiment, the power transmission device further includes: a coupling module and a second power line; the coupling module coupling the broadband signal transmitted by the first power line to the second power line and transmitting the signal to the second power line external device.

Preferably, the power transmission device further includes: a second power access device, the second power access device is connected to the second power line; the coupling module couples the broadband signal transmitted by the first power line to The second power line is transmitted to the second power access device and transmitted to the external device by the second power access device.

Preferably, the first power line comprises a live line and a neutral line, the second power line comprises a live line and a neutral line; the coupling module comprises a magnetic ring;

a live line of the first power line and a live line of the second power line pass through the same magnetic ring, the magnetic ring coupling a broadband signal on a live line of the first power line to a live line of the second current line; a zero line of the first power line and a zero line of the second power line pass through the same magnetic ring, the magnetic ring coupling a broadband signal on a zero line of the first power line to a zero line of the second power line .

Preferably, on the basis of the above signal transmission system, the power transmission device further includes: an electromagnetic noise prevention module, wherein the anti-electromagnetic noise module converts the modulated broadband signal to the first in the signal conversion module The wideband signal transmitted by the power line is subjected to electromagnetic noise interference suppression processing on the wideband signal before the wideband signal is transmitted through the first power line.

Preferably, the first power line is a single-phase AC power line, and the single-phase AC power line includes a live line and a zero line.

Preferably, the signal conversion module is composed of a coupled inductor and a transformer, and the anti-electromagnetic noise module is composed of a safety capacitor and a varistor.

Preferably, the signal-proof broadband signal transmission line is a coaxial cable.

Preferably, the first power access device comprises a first power outlet and the second power access device comprises a second power outlet.

The beneficial effects of the utility model are:

The utility model provides a signal transmission system which solves the problem that multiple power line signals interfere with each other during transmission; in particular, the signal transmission system of the utility model comprises: a modulation and demodulation device and a power transmission device; The device is connected to the power transmission device by a broadband signal transmission line that prevents signal interference; the modulation and demodulation device modulates the input wideband signal to a wideband signal suitable for transmission on the broadband signal transmission line and passes the modulated wideband signal Transmitting a broadband signal transmission line to the power transmission device; the power transmission device transmits the received broadband signal to an external device; the solution of the present invention mainly uses a broadband signal transmission line for preventing signal interference to access the broadband signal, and then The transmission line is transmitted to the external user equipment; since the transmission line in the scheme is anti-signal interference, when the signal is transmitted by the multiplex transmission line, there is no signal interference between the transmission lines; for example, each layer in the building Broadband signal transmission lines with signal interference are used to transmit broadband signals Transmission to the user end, there is no crosstalk between the transmission lines of each layer. Compared with the prior art, the solution of the utility model is applied in the broadband power line coupled transmission system, which can improve the throughput of the system and the signal transmission. Correctness.

DRAWINGS

1 is a schematic structural diagram of a first signal transmission system according to Embodiment 1 of the present invention;

2 is a schematic structural diagram of a second signal transmission system according to Embodiment 1 of the present invention;

3 is a schematic structural diagram of a third signal transmission system according to Embodiment 1 of the present invention;

4 is a schematic structural diagram of a fourth signal transmission system according to Embodiment 1 of the present invention;

FIG. 5 is a schematic diagram of a magnetic ring coupled broadband signal according to Embodiment 1 of the present invention; FIG.

6 is a schematic structural diagram of a fifth signal transmission system according to Embodiment 1 of the present invention;

FIG. 7 is a schematic structural diagram of a sixth signal transmission system according to Embodiment 1 of the present invention; FIG.

FIG. 8 is a schematic structural diagram of a first signal transmission system according to Embodiment 2 of the present invention; FIG.

9 is a schematic structural diagram of a second type of signal transmission system according to Embodiment 2 of the present invention;

FIG. 10 is a schematic structural diagram of a third signal transmission system according to Embodiment 2 of the present invention.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings.

Embodiment 1:

As shown in FIG. 1 , the present embodiment provides a signal transmission system, including: a modem device and a power transmission device; the modem device and the power transmission device are connected by a broadband signal transmission line that prevents signal interference; The modem device modulates the input wideband signal to a wideband signal suitable for transmission on the wideband signal transmission line and transmits the modulated wideband signal to the power transmission device through the wideband signal transmission line; the power transmission device The received broadband signal is transmitted to an external device.

In this embodiment, a broadband signal transmission line capable of preventing signal interference is mainly used to access a broadband signal, and is transmitted to an external device through a power transmission device. The external device in this embodiment is a device other than the signal transmission system, such as a cat that can be used by a user. The power transmission device of this embodiment may be an indoor power transmission network, and the power transmission network transmits the broadband signal to the external device.

In the broadband power line coupled transmission process, the signal transmission system of the embodiment is used, and the broadband signal can be directly transmitted to the user equipment through the broadband transmission line for preventing signal interference, or the broadband signal can be extended by the broadband transmission line, and then coupled to the broadband signal. The power line is transmitted to the user equipment; the prior art directly uses the power line coupling method to transmit the broadband signal to the user equipment, thereby solving the problem of signal interference between the multiple power lines, and improving the data compared with the prior art. The correctness of the transmission and the throughput of the transmission system.

For example, in the solution of the embodiment, in the same floor, after the modulation and demodulation device of the layer demodulates the broadband signal, two broadband signal transmission lines for preventing signal interference can be used to pull out two broadband signals, and then the two broadband signals are used. They are transmitted to the user equipment through two independent power transmission networks, so that the signal interference between the transmission lines will not occur between the transmission lines of the same layer; the signal transmission system of this embodiment will not be different in different floors. Signal interference between transmission lines in the floor, for example, each floor uses a broadband signal transmission line that prevents signal interference to transmit the broadband signal to the power network of the respective floor, and transmits it to the user equipment by the power network.

Preferably, the broadband signal transmission line for preventing signal interference in this embodiment is a coaxial cable.

The signal transmission system of the embodiment may use a plurality of power transmission devices to transmit the broadband signal to the external device for use by the user. Preferentially, as shown in FIG. 2, the power transmission device of this embodiment may include: a signal conversion module and a first power line. The signal conversion module converts the modulated wideband signal into a wideband signal suitable for the first power line, and transmits the broadband signal to the external device by the first power line. In this case, the transmission system converts the broadband signal on the broadband transmission line into a wideband signal that can be transmitted on the power line, and then directly transmits the broadband signal to the external device or other intermediate power transmission device by using the power line to transmit the broadband signal to the external device for the user. use.

The signal transmission system of the present embodiment can be applied to various environments, such as an environment with a power access device and an environment without a power access device. In this embodiment, the power access device is a device for the user to obtain power, such as a power socket. .

The structure of the signal transmission system in this embodiment in an environment with power access will be described below.

As shown in FIG. 3, the power transmission device in the system of this embodiment may further include: a first power access device, where the first power access device is connected to the first power line, A power line transmits the broadband signal to the first power access device, and transmits the signal to the external device through the first power access device.

When the first power access device is a power socket, the transmission system shown in FIG. 3 can use the power socket as a broadband signal access device by transmitting the broadband signal to the power socket, so that the user only needs to insert the plug of the broadband device into the socket. Broadband signals can be obtained for Internet access. For example, the user inserts the plug of the modem into the socket and demodulates the broadband signal to the computer, so that the computer can access the Internet. The transmission system of the present embodiment can save costs by utilizing an already arranged power outlet, that is, using an existing power transmission environment to transmit a wideband signal.

When the actual environment does not have the power access device, the signal transmission system of this embodiment can use the power line to implement the broadband signal transmission signal to implement user equipment access to the Internet. As shown in FIG. 4, on the basis of FIG. 2, the power transmission device in this embodiment further includes: a coupling module and a second power line; and the coupling module couples the broadband signal transmitted by the first power line to the second power line The second power line is transmitted to the external device. Using the system of Figure 4, the user can connect the broadband device directly to the second power line and then demodulate the broadband signal to access the Internet. This embodiment The second power line and the first power line are independent power lines, for example, power lines in the two power transmission networks.

Preferably, the coupling module in the embodiment comprises a magnetic ring, and the broadband signal of one power line is coupled to another power line through the magnetic ring, so that the broadband signal can be transmitted to the designated place and device through the power line. Specifically, in this embodiment, the first includes a live line and a zero line, and the second power line includes a live line and a zero line; the live line of the first power line and the live line of the second power line pass through the same magnetic ring, The magnetic ring couples a broadband signal on a live line of the first power line to a live line of the second current line; a zero line of the first power line and a zero line of the second power line pass through the same magnetic ring The magnetic loop couples the wideband signal on the zero line of the first power line to the zero line of the second power line. The process of signal coupling in this embodiment is described in detail by taking a single-phase AC power line as an example. As shown in FIG. 5, the power line 1 includes a live wire 11 and a neutral wire 12, and the power cable 2 includes a fire wire 21 and A neutral line 22, the live line 11 and the live line 21 pass through the same magnetic ring G1, the neutral line 12 and the zero line 22 pass through the same magnetic ring G2, and the magnetic ring G1 couples the broadband signal on the live line 11 of the power supply 1 to the power supply. On the live line 21 of line 2, the magnetic ring G2 couples the wideband signal on the live line 12 of the power supply 1 to the live line 22 of the power line 2 so that the wideband signal can be transmitted through the power source 2 to a designated location or device.

The transmission system of this embodiment can be set according to actual conditions, and a transmission system suitable for the actual environment is set according to local conditions.

In a case where the power access device is not connected to the first power line, but the second power line is connected to the power access device, the transmission system of the embodiment may couple the broadband signal on the first circuit line to the second circuit line and then Transfer to the power access device. As shown in FIG. 6, on the basis of FIG. 4, the power transmission apparatus in this embodiment further includes: a second power access device; the second power access device is connected to the second power line; The coupling module couples the broadband signal transmitted by the first power line to the second power line and transmits it to the second power access device for transmission to the external device by the second power access device.

When the second power access device is a power socket, the system of the embodiment can couple the broadband signal on the first power line to the input end of the second power line and transmit it to the power socket, and the user can obtain the broadband signal through the power socket.

In the actual situation, magnetic noise and surge interference occur when the broadband signal is transmitted by using the first power line. In order to improve the quality of the wideband signal, in order to improve the quality of the wideband signal, the power transmission device of the embodiment may further include An anti-electromagnetic noise module, the anti-electromagnetic noise module, after the signal conversion module converts the modulated wideband signal to a wideband signal suitable for the first power line transmission, before transmitting the broadband signal through the first power line The signal is subjected to electromagnetic noise interference suppression processing. As shown in FIG. 7, on the basis of FIG. 2, the power transmission device further includes: an electromagnetic noise prevention module, which utilizes the first after the broadband signal is to be modulated. The power line transmits the broadband signal gas to perform electromagnetic noise interference suppression processing on the modulated wideband signal; the system shown in FIG. 7 can effectively suppress electromagnetic noise and surge interference frequently occurring in the transmission process, and can also effectively protect the transmission system equipment. Make power line communication more convenient and practical.

Embodiment 2:

In this embodiment, the signal transmission system of the present invention is introduced by taking the broadband signal transmission line for preventing signal interference as the coaxial cable, the first power line as the single-phase AC power line, and the first power access device as the 3-core power socket as an example. . As shown in Figure 8, A is a coaxial cable, B is a coupled inductor, D transformer, C is a thermistor, E is a 3-core power socket, F is a single-phase AC power line; and B and C constitute a signal conversion module , C and safety capacitors C1 and C2 constitute an anti-electromagnetic noise interference module, the live and neutral wires of the power cable in Figure 8 are respectively connected to the two pins (1, 3) of the power socket E, and the other pin of the E (2 ) Hanging.

The working process of the signal transmission system shown in FIG. 8 is: the coaxial cable A is connected to a BPL (Broadband over Power Lines) coaxial signal outputted by a modem device (not shown), and the signals formed by B and D are The conversion module converts the BPL coaxial signal into a BPL differential signal suitable for transmission on the power line F, and the differential signal is transmitted through the safety capacitor filter and the varistor and transmitted to the one end pin of the 3-core power socket through the power line F (1, 3) ). In the case of a specific power socket, the transmission system of the present embodiment can finally transmit the broadband signal to the power socket for the user to acquire the broadband signal.

The following is a detailed description of the specific structure of the transmission system of the present invention without a power socket. As shown in FIG. 9, A is a coaxial cable, B is a coupled inductor, a D transformer, and C is a thermistor, and F1 is Single-phase AC power line 1, F2 is a single-phase AC power line; where B and C constitute a signal conversion module, C and safety capacitors C1 and C2 constitute an anti-electromagnetic noise interference module, and G is a coupler. The working process of the transmission system shown in FIG. 9 is: the coaxial cable A is connected to the BPL coaxial signal outputted by the modem device (not shown), and the signal conversion module composed of B and D is the BPL coaxial signal. Converted to a BPL differential signal suitable for transmission on the power line F, the differential signal is transmitted to the coupler G through the power supply 1 through the safety capacitor filter and the varistor, and the differential signal on the power line 1 is coupled to the power line by the coupler G 2 for users to obtain broadband signals. The coupler G in FIG. 9 may be a magnetic ring, and the specific coupling process may refer to the description of FIG. 5 of Embodiment 1.

The following describes in detail the specific structure of the transmission system of the present invention in the case where the first power line is not connected to the second power line connection socket of the socket, as shown in FIG. 10, A is a coaxial cable, and B is a coupled inductor, a D transformer, and C. For the thermistor, E is a 3-core power socket, F1 is a single-phase AC power line 1, F2 is a single-phase AC power line; where B and C constitute a signal conversion module, C and safety capacitors C1 and C2 constitute anti-electromagnetic noise The interference module, G is a coupler; the live and neutral wires of the power line 2 are respectively connected to the two pins (1, 3) of the power socket E, and the other pin (2) of the E is suspended.

The working process of the transmission system shown in FIG. 10 is: the coaxial cable A is connected to the BPL coaxial signal outputted by the modem device (not shown), and the signal conversion module composed of B and D is the BPL coaxial signal. Converted to a BPL differential signal suitable for transmission on the power line F, the differential signal is transmitted to the coupler G through the power supply 1 through the safety capacitor filter and the varistor, and the differential signal on the power line 1 is coupled to the power line by the coupler G 2. The pin (1, 3) transmitted from the power source 2 to the power socket E for the user to obtain a wideband signal.

Preferably, in this embodiment, E is a 3-core curved PCB soldering socket.

It should be understood that although the present embodiment describes the specific structure of three different signal transmission systems, the structure of the present invention is not limited to the above three structures, which are set according to the actual power environment.

The above is a further detailed description of the present invention in conjunction with the specific embodiments, and the specific implementation of the present invention is not limited to the description. For those skilled in the art to which the present invention pertains, a number of simple deductions or substitutions may be made without departing from the spirit and scope of the invention.

Industrial applicability

Based on the above technical solution provided by the present invention, a broadband signal transmission line for preventing signal interference is used to access a broadband signal, and then transmitted to an external user equipment; since the transmission line in the solution is capable of preventing signal interference, When the transmission line transmits signals, there is no signal interference between the transmission lines; for example, each layer in the building uses a wideband signal transmission line for signal interference to transmit the broadband signal to the user terminal, and the transmission lines between the layers are not The problem of mutual crosstalk is generated. Compared with the prior art, the solution of the present invention is applied in a broadband power line coupled transmission system, which can improve the throughput of the system and the correctness of signal transmission.

Claims

A signal transmission system comprising: a modem device and a power transmission device;

The modem device and the power transmission device are connected by a broadband signal transmission line that prevents signal interference;

The modem device modulates the input wideband signal into a wideband signal suitable for transmission on the wideband signal transmission line and transmits the modulated wideband signal to the power transmission device through the wideband signal transmission line;

The power transmission device transmits the received broadband signal to an external device.
The signal transmission system according to claim 1, wherein said power transmission device comprises: a signal conversion module and a first power line;

The signal conversion module converts the modulated wideband signal into a wideband signal suitable for the first power line, and the broadband signal is transmitted by the first power line to an external device.
The signal transmission system according to claim 2, wherein said power transmission device further comprises: a first power access device, said first power access device being connected to said first power line, said first power line The broadband signal is transmitted to the first power access device and transmitted to the external device by the first power access device.
The signal transmission system of claim 2, wherein the power transmission device further comprises: a coupling module and a second power line; the coupling module coupling the broadband signal transmitted by the first power line to the second power line through the The second power line is transmitted to the external device.
The signal transmission system according to claim 4, wherein said power transmission device further comprises: a second power access device, said second power access device being connected to said second power line; said coupling module The broadband signal transmitted by the first power line is coupled to the second power line for transmission to the second power access device for transmission to the external device by the second power access device.
The signal transmission system according to claim 4, wherein said first power line comprises a live line and a neutral line, said second power line comprises a live line and a neutral line; said coupling module comprising a magnetic ring;

a live line of the first power line and a live line of the second power line pass through the same magnetic ring, the magnetic ring coupling a broadband signal on a live line of the first power line to a live line of the second current line; Description A neutral line of the first power line and a zero line of the second power line pass through the same magnetic ring that couples the wideband signal on the zero line of the first power line to the zero line of the second power line.
A signal transmission system according to any one of claims 2 to 6, wherein said power transmission device further comprises: an electromagnetic noise prevention module, said electromagnetic noise prevention module transmitting said modulated broadband at said signal conversion module The signal conversion is adapted to the wideband signal transmitted by the first power line and then subjected to electromagnetic noise interference suppression processing on the wideband signal before transmitting the wideband signal through the first power line.
The signal transmission system according to claim 7, wherein said first power line is a single-phase AC power line, and said single-phase AC power line comprises a live line and a neutral line.
The signal transmission system according to claim 8, wherein said signal conversion module is constituted by a coupled inductor and a transformer, and said electromagnetic noise prevention module is composed of a safety capacitor and a varistor.
The signal transmission system according to any one of claims 1 to 6, wherein the signal-proof broadband signal transmission line is a coaxial cable.
A signal transmission system according to claim 3 or 5, wherein said first power access device and said second power access device each comprise a power outlet.