CN109412648B - A signal transmission device based on low-voltage carrier communication and its control method - Google Patents
A signal transmission device based on low-voltage carrier communication and its control method Download PDFInfo
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- CN109412648B CN109412648B CN201811275444.0A CN201811275444A CN109412648B CN 109412648 B CN109412648 B CN 109412648B CN 201811275444 A CN201811275444 A CN 201811275444A CN 109412648 B CN109412648 B CN 109412648B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/546—Combination of signalling, telemetering, protection
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5429—Applications for powerline communications
- H04B2203/5433—Remote metering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5429—Applications for powerline communications
- H04B2203/5441—Wireless systems or telephone
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2209/00—Arrangements in telecontrol or telemetry systems
- H04Q2209/60—Arrangements in telecontrol or telemetry systems for transmitting utility meters data, i.e. transmission of data from the reader of the utility meter
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- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
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- Power Engineering (AREA)
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Abstract
本发明的目的在于提供一种基于低压载波通信的信号传输装置及其控制方法，用于解决将地下室内信号盲区的电力信号传输至信号较好区域，并与主站进行通信的技术问题。一种基于低压载波通信的信号传输装置，包括信息处理系统、信号探测系统和控制系统；信号处理系统包括信号采集终端模块、主机、从机和远程通信串口转换板模块、远程通信模块和低压线缆模块。发明内容有益效果：本发明中涉及的技术方案，能够将地下室内信号盲区的信号，有效的传递至户外信号较好的区域，可靠性较高。
The purpose of the present invention is to provide a signal transmission device based on low-voltage carrier communication and a control method thereof, which are used to solve the technical problem of transmitting the power signal of the signal blind area in the basement to the area with better signal and communicating with the main station. A signal transmission device based on low-voltage carrier communication, including an information processing system, a signal detection system and a control system; the signal processing system includes a signal acquisition terminal module, a host, a slave and a long-distance communication serial port conversion board module, a long-distance communication module and a low-voltage line cable module. SUMMARY OF THE INVENTION Beneficial effects: The technical solution involved in the present invention can effectively transmit the signal in the signal blind area in the basement to the area with better outdoor signal, with high reliability.
Description
Technical Field
The invention relates to the technical field of power communication, in particular to a signal transmission device based on low-voltage carrier communication and a control method thereof.
Background
The low-voltage carrier technology is used as a supplement of an optical fiber communication network or an access network, and provides better technical support for transmission of power signals. Among the prior art, apply power line low pressure carrier technology to basement platform district signal channel construction, set up low pressure power carrier data transmission device promptly at the low voltage circuit, read terminal data through serial data interface, convert the digital information who reads into carrier signal, send to the low voltage circuit through the power line and go on transmitting, the platform district that has the signal is transmitted to the platform district that has the signal through the low voltage circuit to the platform district that will not have the signal, then restore the signal, transmit back master station with carrier wave commentaries on classics GPRS communication module, thereby realize the data communication of terminal and master station system, effectively solve the power consumption information acquisition problem in basement no signal platform district, realize the full coverage and the full collection of power consumption information, and have better popularization and application value.
However, since the outdoor wireless signal is interfered by other factors, there may be a portion of the area where the signal is strong and weak. Therefore, even outdoors, a stronger signal area needs to be sought.
Disclosure of Invention
The invention aims to provide a signal transmission device based on low-voltage carrier communication and a control method thereof, which are used for solving the technical problems of transmitting power signals of underground indoor signal blind areas to areas with better signals and communicating with a master station.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a signal transmission device based on low-voltage carrier communication comprises an information processing system, a signal detection system and a control system;
the signal processing system comprises a signal acquisition terminal module, a host, a slave, a remote communication serial port conversion board module, a remote communication module and a low-voltage cable module; the signal input end of the signal acquisition terminal module is connected with the signal output end of the detected power equipment; the slave machine and the remote communication serial port conversion plate module are both arranged on the signal acquisition terminal module, and the slave machine is connected with the signal output end of the signal acquisition terminal module through the remote communication serial port conversion plate module; the host is electrically connected with the slave machine through a low-voltage cable module, and the host is placed in an outdoor signal to be more beneficial; the remote communication module is arranged on the host and is electrically connected with a signal end of the host, and the remote communication module is in wireless communication with the host;
the signal detection system comprises a wireless signal detector, an electric drive control trolley and a signal detection guide rail; the signal detection guide rail is vertically installed on an outdoor building body, the electric drive control trolley is movably installed on the signal detection guide rail, and the wireless signal detector and the host are installed on the electric drive control trolley.
The wire arranging system comprises a winding drum mechanism and a wire arranging mechanism, wherein the wire arranging mechanism is arranged on the winding drum mechanism; and the communication cable in the low-voltage cable module is wound on the winding drum mechanism through the cable arranging mechanism.
Furthermore, the winding drum mechanism comprises a winding drum frame, a winding drum, a winding drive motor and a winding detection switch, wherein the winding drum is rotatably arranged on the winding drum frame, and two sides of the winding drum are provided with winding drum outer clamping edges; the winding driving motor is a variable frequency motor, the winding driving motor is arranged on the winding drum frame, and the rotary power output end of the winding driving motor is connected with the rotating shaft of the winding drum; the winding detection switch is arranged on the outer clamping edge of the winding drum.
Furthermore, the wire arrangement mechanism comprises a wire arrangement motor, a wire arrangement plate, a wire arrangement screw, a wire arrangement nut, a wire arrangement ring, a front-end wire arrangement detection switch and a rear-end wire arrangement detection switch; the wire arranging plate is arranged between the outer clamping edges of the winding drum at two sides; the wire arranging screw rod is rotatably arranged on the wire arranging plate, the wire arranging motor is arranged at one end of the wire arranging plate, and the rotary power output end of the wire arranging motor is connected with the rotary power input end of the wire arranging screw rod; the wire arranging nut is in matched threaded connection with the wire arranging screw rod and is slidably mounted on the wire arranging driving groove; the wire arranging ring is connected with the wire arranging nut, and the arranged communication cable passes through the wire arranging ring; the front-end wire arrangement detection switch is installed at the front end of the wire arrangement board, and the rear-end wire arrangement detection switch is installed at the rear end of the wire arrangement board.
Furthermore, a cable pulling and fastening detection mechanism is connected to the communication cable in parallel, and the front end of the communication cable is connected with the host through a cable anti-tearing unlocking mechanism.
Furthermore, a redundant structure is adopted for a cable core of the communication cable section which is connected with the cable pulling detection mechanism in parallel; the outside of the redundant cable core is wrapped by an elastic rubber insulating layer;
the cable pulling and tightening detection mechanism comprises a cable tension sensor and a cable tension return spring, the cable tension sensor is fixed on the cable wall outside one end of the redundant cable core, one end of the cable tension return spring is connected with the cable tension sensor, and the other end of the cable tension return spring is connected with the cable wall outside the other end of the redundant cable core.
Furthermore, the cable anti-tear unlocking mechanism comprises a cable anti-tear driving plate, a cable anti-tear soft magnet, a cable anti-tear front plug-in terminal and a cable anti-tear rear plug-in terminal; the cable anti-tearing front plug terminal is mounted at the front end of the communication cable, the cable anti-tearing rear plug terminal is mounted on the host, and the cable anti-tearing front plug terminal and the cable anti-tearing rear plug terminal are connected in a plugging mode;
the cable anti-pulling-off drive plate is installed on the cable anti-pulling-off front plug-in terminal, and the cable anti-pulling-off soft magnet is installed on the host and oppositely arranged corresponding to the cable anti-pulling-off drive plate; and the cable anti-pulling soft magnet is wound with an excitation coil, and the excitation coil is electrically connected with the control system through the cable anti-pulling electric control switch.
A control method of a signal transmission device based on low-voltage carrier communication comprises the following steps:
the signal acquisition terminal module transmits the acquired power equipment signal to the slave machine through the remote communication serial port conversion plate module, the slave machine transmits the modulated signal to the host machine through the low-voltage cable module, and then the slave machine is in wireless communication with the master station through the remote communication module on the host machine;
when the wireless signal detector detects that the wireless signal at the host is weak, the electric drive control trolley drives the host to move on the signal detection guide rail to search for a position where the wireless signal is strong;
when the electric drive control trolley drives the main machine to move on the signal detection guide rail, the wire arrangement mechanism arranges the communication cable wound on the winding drum mechanism to prevent the communication cable from being wound and knotted on the winding drum mechanism;
when the movement of the communication cable is hindered, the cable pull-up detection mechanism detects that the communication cable is stressed too much; the control system controls the cable anti-tearing unlocking mechanism to act, and the communication cable is separated from the host.
The effect provided in the summary of the invention is only the effect of the embodiment, not all the effects of the invention, and one of the above technical solutions has the following advantages or beneficial effects:
1. the technical scheme of the invention can effectively transmit the signal of the underground indoor signal blind area to the area with better outdoor signal, and has higher reliability.
2. The signal detection system in the technical scheme of the invention can search the region with stronger signals; the wire arranging system is used for arranging the communication cables in the low-voltage cable module so as to prevent the communication cables from being wound and knotted to influence the normal movement of the main machine along with the electric drive control trolley.
3. The cable pulling detection mechanism is used for detecting whether the pulling force applied to the communication cable is within a normal range or not, and preventing the communication cable from being damaged by overlarge pulling force if the communication cable is wound and blocked by other sundries in the pulling process; if the cable pulling detection mechanism detects that the pulling force is too large, the remote communication cable is indicated to be wound and blocked by other sundries, the control system controls the cable to break the anti-tearing unlocking mechanism to act, and the remote communication cable is separated from the host.
Drawings
FIG. 1 is a schematic side view of the overall structure of an embodiment of the present invention;
FIG. 2 is a functional block diagram of an information handling system in an embodiment of the present invention;
FIG. 3 is a schematic top view of a wire management system according to an embodiment of the present invention;
FIG. 4 is a schematic view, partially in section, of the cable pull-up detection mechanism in an embodiment of the present invention;
FIG. 5 is a partially enlarged schematic view of the cable anti-tear-off unlocking mechanism in the embodiment of the invention;
in the figure: 1. a signal acquisition terminal module; 2. a host; 3. a slave; 4. a remote communication serial port conversion board module; 5. a remote communication module; 6. a low voltage cable module; 7. a wireless signal detector; 8. the electric drive controls the dolly; 9. a signal detection guide rail; 10. a reel frame; 11. a bobbin; 111. clamping the edge of the reel; 12. a winding drive motor; 13. a winding detection switch; 14. a wire arranging motor; 15. a wire arranging plate; 16. a wire arranging screw rod; 17. arranging a wire nut; 18. arranging wire rings; 19. a front-end wire-arranging detection switch; 20. a rear-end wire-arranging detection switch; 21. a communication cable; 202. a cable pull-tight detection mechanism; 22. redundant cable cores; 23. an elastic rubber insulating layer; 204. the cable anti-tearing unlocking mechanism; 24. a cable tension sensor; 25. a cable tension return spring; 26. the cable is prevented from being pulled apart from the driving plate; 27. the cable is prevented from breaking the soft magnet; 28. the cable is prevented from being pulled apart from the front plug-in terminal; 29. the cable is prevented from being pulled apart and then is plugged into the terminal; 30. a steering wheel; 31. the cable rotates the connector.
Detailed Description
In order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and techniques are omitted so as to not unnecessarily limit the invention.
As shown in fig. 1 to 5, a signal transmission device based on low-voltage carrier communication includes an information processing system, a wire arrangement system, a signal detection system and a control system;
the information processing system is used for converting the power information of the signal blind area in the underground room into a signal station area, and then transmitting the power information to the master station infinitely for data interaction; the signal processing system comprises a signal acquisition terminal module 1, a high-speed carrier communication machine (a host machine 2, a slave machine 3 and a remote communication serial port conversion plate module 4), a remote communication module 5 (a GPIS communication module or a CDMA communication module) and a low-voltage cable module 6. The signal input end of the signal acquisition terminal module 1 is connected with the signal output end of the detected power equipment; the slave 3 and the remote communication serial port conversion plate module 4 are both installed on the signal acquisition terminal module 1, and the slave 3 is connected with the signal output end of the signal acquisition terminal module 1 through the remote communication serial port conversion plate module 4. The host 2 is electrically connected with the slave 3 through a low-voltage cable module 6, and the host 2 is placed in an outdoor signal to be beneficial; the remote communication module 5 is installed on the host machine 2 and is electrically connected with the signal end of the host machine 2, and the remote communication module 5 is in wireless communication with the master station. The low-voltage cable module 6 is transitionally turned by the turning wheel 30 in the process of extending from the basement to the outdoor, and the turning wheel 30 is rotatably arranged on the building body.
The signal detection system is used for detecting the strength of outdoor wireless signals, and when the wireless signals are weak and the information transmission is influenced at the arrangement point of the host machine 2, the signal detection system is used for driving the host machine 2 to move so as to search the optimal signal point; the signal detection system comprises a wireless signal detector 7, an electric drive control trolley 8 (a rail climbing trolley) and a signal detection guide rail 9. The signal detection guide rail 9 is vertically arranged on an outdoor building body, the electric drive control trolley 8 is arranged on the signal detection guide rail 9 and can move up and down along the signal detection guide rail 9, and the signal end of the electric drive control trolley is electrically connected with the control system; the wireless signal detector 7 and the host machine 2 are both arranged on an electric drive control trolley 8. When the wireless signal detector 7 detects that the position signal of the host 2 is weak, the electric drive control trolley 8 drives the wireless signal detector 7 and the host 2 to move up and down along the signal detection guide rail 9 until the strong signal position is found out.
In the moving working process of the signal detection system, the wire arrangement system is used for arranging the communication cables 21 in the low-voltage cable module 6 so as to prevent the communication cables 21 from being wound and knotted to influence the normal movement of the main machine 2 along with the electric drive control trolley 8. The wire arranging system comprises a winding drum mechanism and a wire arranging mechanism, and the wire arranging mechanism is arranged on the winding drum mechanism; the winding drum mechanism is used for winding and unwinding the cable, and the cable arranging mechanism is used for combing the cable to be wound and unwound on the winding drum mechanism one by one. The reel mechanism includes a reel frame 10, a reel 11, a winding drive motor 12, and a winding detection switch 13. The bobbin 11 is rotatably mounted on the bobbin frame 10 through a bobbin rotating shaft, and both sides of the bobbin 11 are provided with bobbin outer clamping edges 111. The winding driving motor 12 adopts a variable frequency motor, the winding driving motor 12 is arranged on the winding drum frame 10, and the rotary power output end of the winding driving motor 12 is connected with the winding drum rotating shaft; and the signal end of the winding driving motor 12 is electrically connected with the control system. The winding detection switch 13 is an ultrasonic distance sensor and is electrically connected with the control system. The winding detection switch 13 is mounted on the outer clamping edge 111 of the winding drum through a support, and the winding detection switch 13 is used for detecting the distance between the detection end of the winding detection switch and the communication cable 21 on the winding drum 11, so that the number of winding layers of the communication cable 21 is judged through a control system, the rotating speed of the winding driving motor 12 is further controlled, and the uniform wire arrangement is realized by matching with a wire arrangement mechanism.
The wire arranging mechanism comprises a wire arranging motor 14, a wire arranging plate 15, a wire arranging screw 16, a wire arranging nut 17, a wire arranging ring 18, a front-end wire arranging detection switch 19 and a rear-end wire arranging detection switch 20 (both adopt ultrasonic distance sensors). The wire arranging plate 15 is transversely arranged between the outer clamping edges 111 of the winding drum on two sides, and a wire arranging driving groove is transversely arranged on the wire arranging plate 15. Two ends of the wire arranging screw rod 16 are rotatably arranged on the wire arranging plate 15 through a mounting seat, and the wire arranging motor 14 is arranged at one end of the wire arranging plate 15; the rotary power output end of the wire arranging motor 14 is connected with the rotary power input end of the wire arranging screw 16, and the signal end of the wire arranging motor 14 is electrically connected with the control system. The wire arranging nut 17 is in matched threaded connection with the wire arranging screw rod 16, a sliding block is arranged at the lower end of the wire arranging nut 17, and the wire arranging nut 17 is slidably mounted on the wire arranging driving groove through the sliding block. The wire management ring 18 is connected to the wire management nut 17, and the communication cable 21 to be managed passes through the wire management ring 18. The front-end wire arranging detection switch 19 is arranged at the front end of the wire arranging plate 15 and is used for detecting whether the wire arranging nut 17 moves to the front end of the wire arranging plate 15; the rear-end wire arrangement detection switch 20 is installed at the rear end of the wire arrangement plate 15 and detects whether the wire arrangement nut 17 moves to the rear end of the wire arrangement plate 15. The front end wire arrangement detection switch 19 and the rear end wire arrangement detection switch 20 are electrically connected with the control system, when the front end wire arrangement detection switch 19 detects that the wire arrangement nut 17 moves to the front end position of the wire arrangement plate 15, the control system controls the wire arrangement motor 14 to rotate in the forward direction, and the wire arrangement screw 16 drives the wire arrangement nut 17 to move towards the rear end; when the rear-end wire arrangement detection switch 20 detects that the wire arrangement nut 17 moves to the rear end position of the wire arrangement plate 15, the control system controls the wire arrangement motor 14 to rotate reversely, and the wire arrangement screw 16 drives the wire arrangement nut 17 to move towards the front end; therefore, the wire arranging ring 18 drives the communication cable 21 to wind on the winding drum 11 in a reciprocating and layered mode.
The low-voltage cable module 6 includes the communication cable 21, the cable pull-out detection mechanism 202, and the cable pull-out prevention unlocking mechanism 204. The communication cable 21 comprises a terminal communication cable and a telecommunication cable, the telecommunication cable is wound on the winding drum 11, the rear end of the telecommunication cable transversely passes through the axial cavity of the winding drum 11 and is connected with the front end of the terminal communication cable through a cable rotary connector 31; the rear end of the terminal communication cable is electrically connected with the slave machine 3. The cable pull-tight detection mechanism 202 is installed on the front section of the telecommunication cable, and the front end of the telecommunication cable is connected with the host 2 through the cable anti-tear unlocking mechanism 204. The cable pull-tight detection mechanism 202 is used for detecting whether the pulling force applied to the telecommunication cable is within a normal range, and preventing the telecommunication cable from being damaged due to excessive pulling force if the telecommunication cable is wound and blocked by other sundries in the drawing process. If the cable pulling-tight detection mechanism 202 detects that the pulling force is too large, it indicates that the telecommunication cable is wound by other sundries and obstructed, the control system controls the cable anti-tearing unlocking mechanism 204 to act, and the telecommunication cable is separated from the host 2.
The cable pulling-tight detection mechanism 202 is connected in parallel to the telecommunication cable, and the cable core of the telecommunication cable section connected in parallel with the cable pulling-tight detection mechanism 202 adopts a redundant structure, namely the cable core is bent and rotated; the outside of the redundant cable core 22 is wrapped by an elastic rubber insulating layer 23 to meet certain telescopic requirements. The cable pulling-tight detection mechanism 202 comprises a cable tension sensor 24 and a cable tension return spring 25, the cable tension sensor 24 is fixed on the cable wall outside one end of the redundant cable core 22, and the signal end of the cable tension sensor 24 is electrically connected with the control system; one end of a cable tension return spring 25 is connected with the cable tension sensor 24, and the other end is connected with the cable wall outside the other end of the redundant cable core 22.
The cable anti-tear unlocking mechanism 204 includes a cable anti-tear drive plate 26, a cable anti-tear soft magnet 27, a cable anti-tear front plug terminal 28, and a cable anti-tear rear plug terminal 29. A cable break-proof front plug terminal 28 is mounted at the front end of the telecommunication cable, and a cable break-proof rear plug terminal 29 is mounted on and communicated with the host 2; the cable break-proof front plug terminal 28 and the cable break-proof rear plug terminal 29 are connected in a plugging manner. The cable anti-tear drive plate 26 (made of a magnetic material, such as a ferrous material) is installed outside the cable anti-tear front plug terminal 28, and the cable anti-tear soft magnet 27 is installed on the host 2 and is oppositely arranged corresponding to the cable anti-tear drive plate 26. The cable anti-pulling-off soft magnet 27 is wound with an excitation coil, the excitation coil is connected with a power supply through a cable anti-pulling-off electric control switch, and a signal end of the cable anti-pulling-off electric control switch is electrically connected with the control system. Under a normal state, the cable anti-pulling-off electric control switch is turned on, the cable anti-pulling-off driving plate 26 is leaned together under the adsorption action of the cable anti-pulling-off soft magnet 27, and the cable anti-pulling-off front plug-in terminal 28 and the cable anti-pulling-off rear plug-in terminal 29 are connected in a plug-in mode. When the cable pulling-tight detection mechanism 202 detects that the stress is too large, the control system controls the cable anti-pulling-apart electric control switch to be disconnected, and the cable anti-pulling-apart driving plate 26 loses the adsorption effect of the cable anti-pulling-apart soft magnet 27 and is relatively separated; the cable break-proof front jack terminal 28 is separated from the cable break-proof rear jack terminal 29 by an excessive tensile force, thereby preventing the main body portion of the telecommunication cable from being damaged by the excessive tensile force.
The control system comprises a control box, a controller (plc) and a control panel, wherein the controller and the control panel are installed on the control box, and the control box is arranged in the underground chamber. The signal input end of the controller is respectively and electrically connected with the control panel, the winding detection switch 13, the front end wire arrangement detection switch 19, the rear end wire arrangement detection switch 20 and the cable tension sensor 24; and the signal output end of the controller is respectively and electrically connected with the winding driving motor 12, the wire arranging motor 14 and the cable anti-tearing electric control switch.
A control method of a signal transmission device based on low-voltage carrier communication comprises the following steps:
the signal acquisition terminal module 1 transmits the acquired power equipment signal to the slave 3 through the remote communication serial port conversion plate module 4, the slave 3 transmits the modulated signal to the host 2 through the low-voltage cable module 6, and then the slave 2 wirelessly communicates with the master station through the remote communication module 5 on the host 2;
when the wireless signal detector 7 detects that the wireless signal at the host 2 is weak, the electric drive control trolley 8 drives the host 2 to move on the signal detection guide rail 9 to search for a position where the wireless signal is strong;
in the process that the electric drive control trolley 8 drives the main machine 2 to move on the signal detection guide rail 9, the wire arrangement mechanism arranges the communication cable 21 wound on the winding drum mechanism to prevent the communication cable 21 from being wound and knotted on the winding drum mechanism;
when the movement of the communication cable 21 is hindered, the cable pull-up detection mechanism 202 detects that the communication cable 21 is under an excessive force; the control system controls the cable break-proof unlocking mechanism 204 to operate, and separates the communication cable 21 from the host 2.
In addition to the technical features described in the specification, the technology is known to those skilled in the art.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and various modifications and variations can be made by those skilled in the art without inventive efforts based on the technical solution of the present invention.
Claims (8)
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| CN201811275444.0A CN109412648B (en) | 2018-10-30 | 2018-10-30 | A signal transmission device based on low-voltage carrier communication and its control method |
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| CN201811275444.0A CN109412648B (en) | 2018-10-30 | 2018-10-30 | A signal transmission device based on low-voltage carrier communication and its control method |
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| CN103227664A (en) * | 2013-04-23 | 2013-07-31 | 国家电网公司 | Field sampling, isolation and power detection system of signal of low-voltage power line |
| JP2016086359A (en) * | 2014-10-28 | 2016-05-19 | Ｎｅｃマグナスコミュニケーションズ株式会社 | Remote meter reading system |
| CN205890906U (en) * | 2015-12-28 | 2017-01-18 | 意法半导体公司 | Power line communications system and track system |
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