A power line carrier communication (PLC) system and method

Abstract

This application provides a power line carrier communication PLC system and method, relating to the field of power line carrier communication technology. The method provided in this application can reduce power reduction caused by carrier power distribution when transmitting carrier signals in a PLC system. The system includes: a PLC host, a first carrier director, a first group of PLC terminal devices, and a second group of PLC terminal devices. The input terminal of the first carrier director is connected to the output terminal of the PLC host, the first carrier director is connected to the first group of PLC terminal devices, and the second output terminal of the first carrier director is connected to the second group of PLC terminal devices. The PLC host can be used to plan the carrier transmission line, generate a carrier control signal according to the carrier transmission line, and issue the carrier control signal from its output terminal. The first carrier director can be used to receive the carrier control signal and, in response to the carrier control signal, connect the transmission path between the PLC host and the PLC terminal devices indicated by the carrier transmission line.

Description

Technical Field

[0001] This application relates to the field of power line carrier communication technology, and in particular to a power line carrier communication PLC system and method. Background Technology

[0002] A fire alarm system (FAS) is an automatic fire-fighting facility that can detect the occurrence of a fire and issue a fire alarm.

[0003] Power line carrier communication (PLC) refers to the technology of transmitting signals over existing power lines (or transmission lines) via carrier waves. Applying PLC technology in fire protection systems enables the transmission of voice, image, or video information on the fire protection secondary bus (or secondary bus) in the FAS (Fire Alarm System). In other words, PLC communication technology is used on the traditional fire protection secondary bus of a fire protection system to transmit voice, image, or video information. The physical network of fire protection circuits in the FAS system includes tree, chain, and ring structures. Both the alarm control panel and the smoke sensor include a PLC communication module. The PLC communication module in the smoke sensor modulates the image information onto the carrier wave, while the PLC communication module in the alarm control panel demodulates and decodes the received image information.

[0004] Please refer to Figure 1 The diagram shows a tree-like structure representing the physical network of fire protection circuits. For example... Figure 1 As shown, the fire alarm bus in the FAS system has a branch on each floor. When the alarm control panel sends a carrier signal to the smoke sensor, carrier power distribution occurs when the carrier signal reaches the branch point of the signal bus. This carrier power distribution occurs when the carrier signal reaches the branch point of the signal bus (e.g., ...). Figure 1 In a power line branching point (e.g., B01), the power of one branch decreases. For example, if B01 is a branching point on a two-wire bus, when the carrier signal on the two-wire bus reaches the branching point of B01, the power of the carrier signal attenuates due to the two branches at the B01 branching point. This carrier power distribution phenomenon limits the transmission distance of PLC signals. For fire protection systems using PLC technology, how to avoid carrier signal power distribution at power line branching points is a pressing technical problem that needs to be solved. Summary of the Invention

[0005] This application provides a power line carrier communication PLC system and method, which reduces the power reduction caused by carrier power distribution when transmitting carrier signals in the PLC system.

[0006] To achieve the above technical objectives, this application adopts the following technical solution:

[0007] In a first aspect, this application provides a PLC system, which may include a PLC host, a first carrier waveguide, a first group of PLC terminal devices, and a second group of PLC terminal devices. The input terminal of the first carrier waveguide is connected to the output terminal of the PLC host via a signal bus, the first carrier waveguide is connected to the first group of PLC terminal devices via a signal bus, and the second output terminal of the first carrier waveguide is connected to the second group of PLC terminal devices via a signal bus.

[0008] The PLC host is used to send carrier control signals from its output terminal. These carrier control signals indicate the transmission path connecting the PLC host and the PLC terminal devices. The PLC terminal devices can belong to either the first group of PLC terminal devices or the second group of PLC terminal devices.

[0009] Since the output of the PLC host is connected to the input of the first carrier director, the first carrier director can receive carrier control signals. The first carrier director can be used to connect the transmission path between the PLC host and the PLC terminal device according to the carrier control signals.

[0010] Understandably, one output of the first carrier director is connected to the first group of PLC terminal devices, and the second output of the first carrier director is connected to the second group of PLC terminal devices. When the carrier signal on the signal bus is transmitted to the first carrier director, the carrier signal can be transmitted to the first group of PLC terminal devices through the first carrier director, or the carrier signal can also be transmitted to the second group of PLC terminal devices through the first carrier director. The first carrier director can connect the transmission path between the PLC host and the PLC terminal devices according to the carrier control signal. In this way, the carrier signal transmission to the branch point on the signal bus (i.e., the first carrier director) can connect the PLC host and the PLC terminal devices according to the transmission line, so that the carrier signal power attenuation can be reduced when passing through the nodes of the signal bus, effectively ensuring the transmission of the carrier signal on the signal bus.

[0011] In one possible design of the first aspect, the carrier control signal includes control information for a carrier director. The first carrier director is used to: determine the carrier path of the first carrier director based on the control information of the carrier director, so as to connect the transmission path between the PLC host and the PLC terminal equipment.

[0012] In this PLC system, the host PLC can plan the carrier transmission route and generate carrier control signals based on the planned route. These carrier control signals are used to control the first carrier director, thereby adjusting the carrier transmission path and effectively ensuring the transmission of carrier signals on the signal bus.

[0013] The first carrier director can be used to receive carrier control empty signals and, in response to carrier control signals, connect the transmission path between the PLC host and the PLC terminal device indicated by the carrier transmission line.

[0014] Understandably, the PLC master can receive PLC-encoded carrier signals sent by the PLC terminal device via the signal bus, and the PLC master can also send PLC-encoded carrier signals to the PLC terminal device via the signal bus. When the carrier signal is transmitted to a branch point on the signal bus, the branch point corresponds to at least two transmission paths, causing the carrier signal to experience power attenuation at the nodes of the signal bus.

[0015] The PLC system provided in this application has one output terminal of a first carrier director connected to a first group of PLC terminal devices, and a second output terminal of the first carrier director connected to a second group of PLC terminal devices. When a carrier signal on the signal bus is transmitted to the first carrier director, the carrier signal can be transmitted to the first group of PLC terminal devices through the first carrier director, or the carrier signal can also be transmitted to the second group of PLC terminal devices through the first carrier director. That is, the first carrier director can be located at a branch point of the signal bus. The host PLC in the PLC system can plan the carrier transmission route and generate a carrier control signal according to the planned carrier transmission route. The carrier control signal is used to control the first carrier director. When the first carrier director receives the carrier control signal, it can determine the transmission route of the carrier signal, so that the carrier signal transmitted to the first carrier director is transmitted to the corresponding PLC terminal device according to the transmission route. In this way, the carrier signal transmission to the branch point on the signal bus (i.e., the first carrier director) can connect the host PLC and the PLC terminal devices according to the transmission line, so that the carrier signal power attenuation can be reduced when passing through the nodes of the signal bus, effectively ensuring the transmission of the carrier signal on the signal bus.

[0016] In another possible design approach of the first aspect, the carrier control signal includes the identifier of the PLC terminal device. The first carrier director is used to: determine the carrier path corresponding to the PLC terminal device based on the identifier of the PLC terminal device and the preset PLC topology diagram, and connect the transmission path between the PLC host and the PLC terminal device.

[0017] The carrier control signal includes the identifier of the PLC terminal device, enabling the first carrier director to connect the transmission path between the PLC host and the PLC terminal device according to the carrier control signal.

[0018] In one possible design of the first aspect, the first carrier guide may include: a first carrier path and a second carrier path. The first end of the first carrier path is connected to the output of the PLC host, and the second end of the first carrier path is connected to a first group of PLC terminal devices. The first end of the second carrier path is connected to the output of the PLC host, and the second end of the second carrier path is connected to a second group of PLC terminal devices.

[0019] As can be understood, if the first carrier director is connected to the first group of PLC terminal devices and the second group of PLC terminal devices respectively, then the first carrier director can include two carrier paths, with one carrier path corresponding to one group of PLC terminal devices. This allows the first carrier director to control the carrier transmission path according to the carrier control signal.

[0020] When the first carrier director is connected to other PLC terminal devices or carrier directors, the first carrier director can include more carrier paths. For example, the first carrier director can also include a third carrier path, through which it can connect to a third group of PLC terminal devices. As another example, the first carrier director can also include a third carrier path, through which it can connect to a second carrier director.

[0021] In another possible design of the first aspect, the first carrier director is located at a node position on the signal bus, and multiple outputs of the first carrier director are connected to corresponding PLC terminal devices. Specifically, the first carrier director can be used to: connect the transmission path between the PLC host and the first group of PLC terminal devices when the carrier control signal indicates that the transmission path is connected, that is, when the PLC host is connected to the first group of PLC terminal devices. The first carrier director connects the transmission path on the first carrier path, allowing the transmission of PLC carrier signals on the first carrier path, and disconnects the transmission path on the second carrier path, preventing the transmission of PLC carrier signals on the second carrier path.

[0022] When the carrier control signal indicates that the transmission path between the PLC host and the second group of PLC terminal devices is connected, that is, when the PLC host and the second group of PLC terminal devices are connected, the first carrier director connects the transmission path on the second carrier path, allowing the transmission of PLC carrier signals on the second carrier path, and disconnects the transmission path on the first carrier path, preventing the transmission of PLC carrier signals on the first carrier path.

[0023] Understandably, the carrier control signal achieves the goal of controlling the carrier transmission line by controlling the state of the carrier path in the first carrier director. In this way, the carrier control signal can connect the PLC host and the PLC terminal device according to the transmission line at the node position (i.e., the first carrier director) on the signal bus, so that the carrier signal will not experience power attenuation when passing through the node of the signal bus, effectively ensuring the transmission of the carrier signal on the signal bus.

[0024] In another possible design of the first aspect, both the first carrier path and the second carrier path include a first switch, a second switch, and a carrier wave blocker; wherein the first switch is connected in series with the carrier wave blocker, and the second switch is connected in parallel with the series circuit composed of the first switch and the carrier wave blocker.

[0025] In this circuit, the first switch and the carrier wave trap are connected in series, and the second switch is connected in parallel with the circuit containing the first switch and the carrier wave trap. When the first switch is closed and the second switch is open, the branch containing the first switch is in a conducting state, allowing power signals other than the carrier signal to be transmitted through the branch containing the first switch. When the first switch is open and the second switch is closed, the carrier signal can be transmitted through the branch containing the second switch.

[0026] Specifically, the first carrier guide is used to: close the second switch in the first carrier path and open the first switch in the first carrier path when the carrier control signal indicates the transmission path connecting the PLC host and the first group of PLC terminal devices, so that the first carrier path can transmit PLC carrier signals; and open the second switch in the second carrier path and close the first switch in the second carrier path, so that the second carrier path cannot transmit PLC carrier signals.

[0027] When the carrier control signal indicates the transmission path connecting the PLC host and the second group of PLC terminal devices, the second switch in the second carrier path is closed, and the first switch in the second carrier path is opened, allowing the transmission of PLC carrier signals in the second carrier path; and the second switch in the first carrier path is opened, and the first switch in the first carrier path is closed, disallowing the transmission of PLC carrier signals in the first carrier path.

[0028] In another possible design approach of the first aspect, the carrier wave blocker is a wave blocker element, an inductor element, or a magnetic ring.

[0029] As is understandable, the function of a carrier wave blocker is to prevent the carrier signal from passing through. In order to ensure the transmission of signals other than the carrier signal, the power signal can be transmitted to the PLC host through the carrier wave blocker. Therefore, the carrier wave blocker can be a wave-blocking element, an inductive element, or a magnetic ring. The carrier wave blocker can also be other elements that can block the transmission of carrier signals; this is just an example.

[0030] In another possible design of the first aspect, the PLC system may further include: a second carrier director and a third set of PLC terminal devices. The input of the second carrier director is connected to the third output of the first carrier director via a signal bus; the output of the second carrier director is connected to the third set of PLC terminal devices. The second carrier director can be used to: receive carrier control signals, and in response to the carrier control signals, establish a transmission path between the PLC host and the PLC terminal devices indicated by the carrier transmission line.

[0031] Understandably, a PLC system can include multiple carrier directors, and each carrier director can connect to multiple sets of PLC terminal devices. When the PLC host establishes carrier communication with the preset PLC terminal devices, the PLC can plan the transmission line according to the preset PLC terminal locations.

[0032] In another possible design of the first aspect, the second carrier director includes a third carrier path. The first end of the third carrier path is connected to the third output terminal of the first carrier director, and the second end of the third carrier path is connected to a third set of PLC terminal devices.

[0033] The second carrier guide includes a carrier path. The carrier control signal sent by the PLC host can control the carrier path in the second carrier guide to achieve the purpose of controlling the carrier transmission line.

[0034] In another possible design of the first aspect, the PLC host is also used to: encode the first transmission information using PLC technology to obtain a first PLC carrier signal. The PLC host is also used to: acquire the PLC topology in the PLC system, and plan the carrier transmission line based on the PLC topology and the PLC terminal devices in the PLC system that are to receive the first PLC carrier signal. The PLC host is also used to: send the first PLC carrier signal from the output terminal of the PLC host.

[0035] The PLC host includes a PLC topology structure with multiple PLC terminal devices, which allows the PLC host to plan the transmission lines according to the location of the PLC terminal devices. This ensures that the carrier signal does not experience power attenuation when passing through the nodes of the signal bus, effectively guaranteeing the transmission of the carrier signal on the signal bus.

[0036] In another possible design of the first aspect, the PLC host is also used to: acquire the PLC topology in the PLC system, and plan the carrier transmission line based on the PLC topology and the PLC terminal devices in the PLC system that are to transmit the second PLC carrier signal. The PLC host is also used to: receive the second PLC carrier signal.

[0037] In another possible design of the first aspect, each group of PLC terminal devices includes one or more PLC terminal devices. The PLC terminal devices may include at least: video acquisition units, smoke sensors, audible and visual alarms, manual alarm devices, temperature sensors, and fire display screens, etc.

[0038] Understandably, if the PLC system is a fire alarm system, then the PLC terminal device can be a sensor within the fire alarm system. If the PLC system is a power IoT system, then the PLC terminal device can be a PLC IoT node device, etc. This is just an example; different PLC systems may use different terminal devices.

[0039] In another possible design of the first aspect, both the first carrier path and the second carrier path include a first switch, a second switch, and a carrier wave blocker; wherein the first switch is connected in series with the carrier wave blocker, and the second switch is connected in parallel with the series circuit composed of the first switch and the carrier wave blocker.

[0040] For example, the destination address in the carrier signal is the identifier of the first PLC terminal device, which belongs to the first group of PLC terminal devices. The PLC controller in the first carrier director can control the first switch in the first carrier path to be in the open state and the second switch to be in the closed state; and control the first switch in the second carrier path to be in the closed state and the second switch to be in the open state.

[0041] For example, the destination address in the carrier signal is the identifier of the first PLC terminal device, which belongs to the second group of PLC terminal devices. The PLC controller in the first carrier director can control the first switch in the first carrier path to be in a closed state and the second switch to be in an open state; and control the first switch in the second carrier path to be in an open state and the second switch to be in a closed state.

[0042] Secondly, this application also provides a method for transmitting power line carrier signals in a PLC, which can be applied to the PLC system described in the first aspect and any of its possible design embodiments. The method includes: the PLC host can plan the carrier transmission line and generate a carrier control signal based on the carrier transmission line. The PLC host sends the carrier control signal through its output terminal. The carrier control signal indicates the carrier transmission path connecting the PLC host and the PLC terminal device indicated by the carrier transmission line. A first carrier director receives the carrier control signal and, in response to the carrier control signal, establishes the transmission path connecting the PLC host and the PLC terminal device indicated by the carrier transmission line.

[0043] In one possible design approach of the second aspect, before the PLC host plans the carrier transmission line and generates the carrier control signal based on the carrier transmission line, the PLC host can also use PLC technology to encode the first transmission information to obtain the first PLC carrier signal. In this way, the PLC host obtains the PLC topology in the PLC system, and plans the carrier transmission line based on the PLC topology and the PLC terminal devices in the PLC system that are to receive the first PLC carrier signal.

[0044] In another possible design approach, the PLC host can also send a first PLC carrier signal from its output.

[0045] In another possible design approach, the PLC host can receive a second PLC carrier signal from the PLC terminal device via a carrier transmission line.

[0046] Understandably, when a carrier signal is transmitted to a branch point on the signal bus, the branch point corresponds to at least two transmission paths, causing power attenuation of the carrier signal at the nodes of the signal bus. A first carrier director is positioned at the branch point of the signal bus, allowing it to adjust the transmission path of the carrier signal at that point. For example, if the first PLC terminal device belongs to the first group of PLC terminal devices, the first carrier director connects the PLC host and the first group of PLC terminal devices through its first output terminal. Alternatively, if the first PLC terminal device belongs to the second group of PLC terminal devices, the first carrier director connects the PLC host and the second group of PLC terminal devices through its second output terminal. Therefore, the carrier signal transmitted to the branch point on the signal bus (i.e., the first carrier director) can be transmitted to the first PLC terminal device through either its first or second output terminal, reducing power attenuation as the carrier signal passes through the nodes of the signal bus and effectively ensuring the transmission of the carrier signal on the signal bus.

[0047] Thirdly, this application also provides a method for transmitting a PLC carrier signal in power line communication. This method can be applied to the first carrier conductor in the first, second, and fourth aspects and any possible design embodiments thereof. The method may include: receiving a carrier control signal from a PLC host, the carrier control signal indicating a transmission path connecting the PLC host and the PLC terminal device; and connecting the transmission path between the PLC host and the PLC terminal device according to the carrier control signal.

[0048] In one possible design approach of the third aspect, the carrier control signal includes control information for the carrier director. Connecting the transmission path between the PLC host and the PLC terminal device based on the carrier control signal specifically includes: determining the carrier path of the first carrier director based on the control information of the carrier director, so as to connect the transmission path between the PLC host and the PLC terminal device.

[0049] In another possible design approach, the carrier control signal includes the identifier of the PLC terminal device. The transmission path between the PLC host and the PLC terminal device is connected based on the carrier control signal. Specifically, this may include: determining the carrier path corresponding to the PLC terminal device based on the identifier of the PLC terminal device and a preset PLC topology diagram, and connecting the transmission path between the PLC host and the PLC terminal device.

[0050] Fourthly, this application also provides a PLC host, which may include a generation module and a transmission module.

[0051] The generation module can be used by the PLC host to plan the carrier transmission line and generate carrier control signals based on the carrier transmission line. The transmission module can be used by the PLC host to send carrier control signals through the output terminal of the PLC host, wherein the carrier control signals are used to indicate the carrier transmission path connecting the PLC host and the PLC terminal device indicated by the carrier transmission line.

[0052] In one possible design approach of the fourth aspect, the PLC host may further include an encoding module. The encoding module is used by the PLC host to encode the first transmission information using PLC technology to obtain a first PLC carrier signal. Specifically, the generation module is used by the PLC host to acquire the PLC topology in the PLC system and, based on the PLC topology and the PLC terminal devices in the PLC system that will receive the first PLC carrier signal, to plan the carrier transmission line.

[0053] In another possible design in the fourth aspect, the transmission module is also used for the PLC host to send a first PLC carrier signal from the output of the PLC host.

[0054] In another possible design in the fourth aspect, the transmission module is also used for the PLC host to receive a second PLC carrier signal from the PLC terminal device via a carrier transmission line.

[0055] Fifthly, this application also provides a carrier director, which may include: a receiving module and a power line carrier communication PLC control module.

[0056] The receiving module receives carrier control signals from the PLC host, which indicate the transmission path between the PLC host and the PLC terminal device. The PLC control module establishes the transmission path between the PLC host and the PLC terminal device based on the carrier control signals.

[0057] In one possible design of the fifth aspect, the carrier control signal includes control information for the carrier director. The PLC control module is used to determine the carrier path of the first carrier director based on the control information of the carrier director, so as to connect the transmission path between the PLC host and the PLC terminal device.

[0058] In another possible design approach in the fifth aspect, the carrier control signal includes the identifier of the PLC terminal device. The PLC control module is used to determine the carrier path corresponding to the PLC terminal device based on the identifier of the PLC terminal device and the preset PLC topology diagram, and to connect the transmission path between the PLC host and the PLC terminal device.

[0059] Sixthly, this application also provides a chip system applied to a power line carrier communication PLC host; the chip system includes one or more interface circuits and one or more processor interface circuits interconnected with the processor via lines. The interface circuits are used to receive signals from the electronic device's memory and send signals to the processor, the signals including computer instructions stored in the memory. When the processor executes the computer instructions, the PLC host executes the method described in the second aspect above and any of its possible design embodiments.

[0060] In a seventh aspect, this application also provides a chip system applied to a first carrier transmitter; the chip system includes one or more interface circuits and one or more processor interface circuits interconnected with the processor via lines. The interface circuits are used to receive signals from the memory of an electronic device and to send signals to the processor, the signals including computer instructions stored in the memory. When the processor executes the computer instructions, the first carrier transmitter can perform the methods described in the third aspect above and any of its possible design embodiments.

[0061] Eighthly, this application also provides a computer-readable storage medium including computer instructions. When the computer instructions are executed on a device, they cause the device to perform the methods of the second aspect and any of its possible design embodiments.

[0062] Ninthly, this application also provides a computer program product that, when run on a computer, enables the computer to perform the methods described in the second aspect and any of its possible design embodiments.

[0063] It is understood that the beneficial effects achieved by the methods in the second aspect and any possible design of the third aspect and any possible design of the fourth aspect and any possible design of the present application, the PLC host in the fifth aspect and any possible design of the fifth aspect and any possible design of the fifth aspect, the chip system in the sixth and seventh aspects, the computer-readable storage medium in the eighth aspect and the computer program product in the ninth aspect can be referred to as the beneficial effects in the first aspect and any possible design of the fifth aspect, which will not be repeated here. Attached Figure Description

[0064] Figure 1 A physical network diagram of a fire protection circuit provided in this application;

[0065] Figure 2 This is a hardware schematic diagram of a FAS structure provided in an embodiment of this application;

[0066] Figure 3 This is a schematic diagram of the hardware structure of another FAS system provided in an embodiment of this application;

[0067] Figure 4 This application provides a structural diagram of a FAS system with a tree-like physical network structure.

[0068] Figure 5 This application provides a schematic diagram of the structure of a PLC system according to an embodiment of the present application.

[0069] Figure 6A This is a schematic diagram of another PLC system provided in an embodiment of this application;

[0070] Figure 6B This is a schematic diagram of another PLC system provided in an embodiment of this application;

[0071] Figure 6C This is a schematic diagram of another PLC system provided in an embodiment of this application;

[0072] Figure 7A A circuit structure diagram of a PLC system provided in an embodiment of this application;

[0073] Figure 7B This is a schematic diagram of the circuit structure of another PLC system provided in an embodiment of this application;

[0074] Figure 8 This is a schematic diagram of another PLC system provided in an embodiment of this application;

[0075] Figure 9 A flowchart illustrating a method for transmitting a PLC carrier signal, provided in an embodiment of this application;

[0076] Figure 10 A structural block diagram of a PLC system provided in an embodiment of this application;

[0077] Figure 11 A schematic diagram of the structure of a PLC host provided in an embodiment of this application;

[0078] Figure 12 This is a schematic diagram of a carrier waveguide provided in an embodiment of this application. Detailed Implementation

[0079] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this embodiment, unless otherwise stated, "a plurality of" means two or more.

[0080] In communication systems employing PLC technology, the communication lines typically use copper wire, low-voltage power lines, or twisted-pair cables to facilitate the transmission of carrier signals encoded using PLC technology. A typical PLC communication system includes multiple terminal devices (or PLC terminal equipment) equipped with PLC communication modules and a PLC host. The PLC host can communicate with the PLC terminal equipment. Generally, the physical network topology of a PLC communication system includes tree, chain, and ring topologies. These physical network structures lead to numerous branching points within the PLC communication system. Since the PLC-encoded signal is a carrier signal, carrier power distribution occurs at these branching points during transmission through the PLC system's lines.

[0081] It should be noted that communication systems employing PLC technology can include: fire protection systems, low-voltage power line IoT systems, building control systems, and video access control systems. These systems typically include a PLC main unit and multiple PLC terminal devices. The PLC main unit includes a PLC communication module, and each PLC terminal device includes a PLC communication module. The PLC main unit can encode video and audio signals into carrier signals using PLC encoding, and then transmit these carrier signals to the PLC terminal devices. Upon receiving the carrier signals, the PLC terminal devices decode them using their PLC communication modules to obtain the audio or video signals.

[0082] For example, in a fire protection system using PLC communication, the system includes a fire control panel and multiple fire detectors. The fire control panel may include a PLC communication module, and the fire detectors may also include PLC communication modules. Fire detectors include detectors such as visual smoke sensors.

[0083] For example, a video access control system includes a PLC host and multiple video access points, both of which include a PLC communication module. This application uses a fire protection system employing PLC communication as an example to illustrate the transmission of carrier signals obtained through PLC encoding within the PLC system.

[0084] Please refer to Figure 2 This is a schematic diagram of the hardware structure of a fire alarm system (FAS) provided in an embodiment of this application. Figure 2 As shown, the FAS includes a fire detection and alarm system 201, a fire linkage control system 202, and a fire early warning system 203. The fire detection and alarm system includes a fire alarm controller 204, and fire detectors 205, manual fire alarm buttons 206, and audible and visual alarm devices 207 connected to the fire alarm controller 204. The fire linkage control system 202 includes a fire linkage controller 211, a fire electrical control device 212, an output module 213, a fire electric device 214, a fire telephone 215, a fire emergency broadcast 216, a fire control display device 217, and fire hydrant buttons 218. The fire early warning system 203 includes a combustible gas detection system 219 and an electrical fire monitoring system 220.

[0085] The fire alarm controller 204 is also connected to the fire monitoring center 209 via transmission equipment 208, and is also connected to the fire power supply 210. The fire power supply 210 provides power to the fire alarm controller 204, and can also provide power to the fire linkage controller 211. The fire alarm controller 204 can also be connected to the combustible gas detection system 219 and the electrical fire monitoring system 220 to acquire detection signals from the combustible gas detection system 219 and the electrical fire monitoring system 220.

[0086] The fire control display device 217 can be connected to the fire alarm controller 204. The fire control display device 217 can also be connected to the combustible gas detection system 219 and the electrical fire monitoring system 220, so that the fire control display device 217 can display the signals detected by the combustible gas detection system 219 and the electrical fire monitoring system 220.

[0087] The fire alarm control panel 211 can be connected to the fire electrical control device 212, which can be connected to various electrical devices, such as gas extinguishing controllers, fire pump controllers, fireproof roller shutter controllers, smoke exhaust controllers, and fire door controllers. The fire alarm control panel 211 is connected to the fire electric device 214 via the output module 213.

[0088] Understandably, the fire detection and alarm system 201 can detect fire events (i.e., fire alarms) in their early stages. For example, fire detectors may include temperature sensors, smoke sensors, and light radiation sensors, enabling them to detect physical quantities such as heat, smoke, and light radiation generated by combustion, and convert these physical quantities into electrical signals, thereby detecting the occurrence of a fire. After detecting a fire, the fire detection and alarm system 201 can activate audible and visual alarms to alert people to the fire and allow them to react.

[0089] As is understandable, PLC technology refers to the technology of transmitting signals on an existing fire alarm two-wire bus (or two-wire bus) via carrier wave. When using a two-wire bus to transmit signals, the transmitter can first modulate the information to be transmitted (such as voice information) onto a high-frequency carrier wave. This high-frequency carrier wave is then amplified and coupled to the two-wire bus via a coupling circuit. In this way, the two-wire bus can transmit the information via carrier wave. Since the information to be transmitted is modulated onto the high-frequency carrier wave, the peak voltage of the signal band generally does not exceed 10V. That is to say, when PLC technology is used to encode the information to be transmitted and then transmits this PLC-encoded information via the two-wire bus, the peak voltage of the signal band transmitted on the two-wire bus will not exceed 10V. Therefore, transmitting signals encoded using PLC technology on the two-wire bus will not adversely affect the two-wire bus.

[0090] This involves using PLC technology to encode audio or video signals, enabling transmission of these signals over a two-wire bus. Therefore, improvements can be made to the audible and visual alarm devices in the FAS system to allow them to receive audio signals. Alternatively, the smoke detectors in the FAS system can be improved to acquire image information, allowing the smoke sensor to transmit the PLC-encoded video signal to the PLC host in the FAS system.

[0091] Please refer to the examination. Figure 3 This is a schematic diagram of the hardware structure of the FAS system provided in an embodiment of this application. Figure 3As shown, the FAS system may include a PLC main unit 10, a smoke sensor 11, a temperature sensor 12, an input module 13, a manual alarm button 14, a fire hydrant button 15, a relay module 16, a combustible gas detector 17, an audible and visual alarm 18, an input / output module 19, a broadcast module 20, and a floor display device 21. The other end of the manual alarm button 14 is connected to the PLC main unit 10 via a telephone line. The other ends of the relay module 16, combustible gas detector 17, audible and visual alarm 18, input / output module 19, broadcast module 20, and floor display device 21 are all connected to a power supply line.

[0092] In addition, the PLC host 10 can also be connected to the dual-line module 22 via a dual-line connection. The dual-line module 22 is connected to the switching module 23 via four single lines. The switching module 23 is connected to the fire pump 24, the sprinkler pump 25, and the fan 26, respectively.

[0093] This application embodiment uses the FAS system to detect fire alarms as an example. In such... Figure 1 In the illustrated FAS system, the PLC host 10 can receive data transmitted from the smoke sensor 11, temperature sensor 12, and combustible gas detector 17, and determine whether a fire alarm has occurred based on this data. If the PLC host 10 determines that a fire alarm has occurred, the floor display device 21 connected to the PLC host 10 can display information such as the area where the fire occurred and the time of the fire. The PLC host 10 can also control the operation of the fire pump 24, sprinkler pump 25, and fan 26. In addition, the PLC host 10 can also be linked with related equipment such as automatic sprinkler systems, indoor and outdoor fire hydrant systems, smoke control systems, ventilation systems, air conditioning systems, fire doors, fireproof roller shutters, and smoke curtains. When the PLC host 10 determines that a fire alarm has occurred, it can control the issuance of commands to the aforementioned related equipment to start their operation.

[0094] An isolator 101 is installed on the signal bus connected to the PLC host 10. The isolator 101 is a protection device for the fire alarm bus, and it is equivalent to a switch on the signal bus. When the current on the signal bus exceeds a preset current value, the isolator 101 will be triggered to disconnect the signal bus from the PLC host 10.

[0095] Input module 13 is connected to water flow indicator 131 and / or signal valve 132. PLC host 10 can control the state of water flow indicator 131 and / or signal valve 132 through input module 13. Water flow indicator 131 provides feedback on the state of water flow in the fire hose, including both static and flowing states. Signal valve 132 provides feedback on the state of the water flow valve, including both open and closed states. For example, water flow indicator 131 can be installed on the water supply pipe or crossbar pipe of an automatic sprinkler system to indicate whether the water flow in the water supply pipe or crossbar pipe is static or flowing.

[0096] The input / output module 19 can be connected to the electric switch 191, elevator switch 192, roller shutter switch 193, and damper switch 194, respectively. The input / output module 19 can receive switching signals transmitted on the signal bus, such as on or off signals. The input / output module 19 can control the electric switch 191, elevator switch 192, roller shutter switch 193, and damper switch 194 based on the received on or off signals.

[0097] The broadcast module 20 can be connected to an audio system. The other end of the broadcast module 20 can be connected to the PLC host 10 via a broadcast bus to receive the voice signal transmitted by the PLC host 10. The broadcast module 20 controls the audio broadcast of the voice signal. Since the signal bus cannot transmit audio (i.e., voice signal), a broadcast bus is added to the broadcast module 20 in the FAS system so that the PLC host 10 can send voice signals to the broadcast module 20 via the broadcast bus.

[0098] Understandably, while the audible and visual alarm 18 serves as a warning during a fire, its warning mechanism involves flashing indicator lights and emitting a buzzer. If the FAS system detects a fire, the audible and visual alarm 18 will sound, informing people that a fire has occurred. However, it cannot determine from the alarm whether the fire is actually a fire or how to escape. In this situation, the FAS system's broadcast voice function becomes particularly important. The PLC host 10 can send voice signals to the broadcast module 20 via the broadcast bus. The broadcast module 20 can then broadcast voice messages through connected speakers, allowing people to receive fire information and reducing panic surrounding fire alarms.

[0099] Relay module 16 is connected to a 24V DC power supply at one end and to the signal bus at the other end. Relay module 16 enables electrical isolation between input and output signals while transmitting them on the signal bus, thus achieving isolated signal transmission. Therefore, including relay module 16 in a FAS system can enhance its anti-interference capability and expand the communication capability of the signal bus. In some FAS system applications, when the signal bus is located in an area with strong electromagnetic interference and its length exceeds 1000m, including relay module 16 can further enhance the FAS system's anti-interference capability and expand the signal bus's communication capability.

[0100] The smoke sensor 11 can monitor the smoke concentration in its area, convert the detected smoke concentration into an electrical signal, and send the electrical signal to the alarm host. The PLC host 10 receives the electrical signal transmitted by the smoke sensor 11, can determine the smoke concentration in the area where the smoke sensor 11 is located based on the electrical signal, and determine whether a fire has occurred in the area where the smoke sensor 11 is located based on the smoke concentration.

[0101] Temperature sensor 12 can monitor the temperature of its surrounding area, convert the monitored temperature value into an electrical signal, and send the electrical signal to PLC host 10. PLC host 10 can determine the temperature of the area where temperature sensor 12 is located based on the electrical signal from temperature sensor 12, and determine whether the area where temperature sensor 12 is located is overheating, so as to determine whether a fire alarm has occurred.

[0102] The combustible gas detector 17 can monitor the concentration of one or more combustible gases in its area. The combustible gas can be methane, ethane, propane, or butane, etc. The combustible gas detector 17 can detect the concentration of combustible gases in its area and transmit the corresponding electrical signal to the PLC host 10. The PLC host 10 can determine the concentration of combustible gases based on the electrical signal transmitted by the combustible gas detector 17, thereby determining whether a fire may occur in the area where the combustible gas detector 17 is located.

[0103] In some implementation scenarios, when a smoke sensor 11, a temperature sensor 12, and a combustible gas detector 17 are installed in an area at the same time, the PLC host 10 can comprehensively determine whether a fire may occur in the area, or whether a fire has occurred in the area, based on the electrical signals transmitted by the smoke sensor 11, temperature sensor 12, and combustible gas detector 17.

[0104] The manual alarm button 14 is triggered when the alarm button within it is pressed. Once triggered, the manual alarm button 14 can send an alarm event to the PLC host 10. In other words, the manual alarm button 14 does not have the capability to proactively report fire incidents; it only reports a fire incident to the PLC host 10 when triggered by an external force. For example, if an area is equipped with a smoke sensor 11, a temperature sensor 12, a combustible gas detector 17, and a manual alarm button 14, and a fire occurs in that area, but the PLC host 10 does not detect a fire based on the electrical signals from the smoke sensor 11, temperature sensor 12, and combustible gas detector 17, a person in that area can press the manual alarm button 14 to trigger the alarm.

[0105] The audible and visual alarm 18 includes a buzzer and an indicator light. If the audible and visual alarm 18 receives an alarm signal transmitted from the PLC host 10, the buzzer of the audible and visual alarm 18 will sound and the indicator light will flash. In this way, the audible and visual alarm 18 can alert people in a certain area around it. People in the area around the audible and visual alarm 18 can understand that the fire alarm has been triggered and a fire has occurred by hearing the buzzer or seeing the indicator light flashing.

[0106] Understandably, the smoke sensor 11, temperature sensor 12, manual alarm button 14, combustible gas detector 17, and audible and visual alarm 18 mentioned above can all be equipped with PLC communication modules to become PLC terminal devices in the FAS system.

[0107] It should be noted that the above Figure 3 This is a schematic diagram of a portion of a FAS network. For example, the FAS system is configured as a network located on one floor of a high-rise building.

[0108] In this FAS system, the smoke sensor 11 is assumed to acquire image information, and the smoke sensor 11 includes a PLC communication module. The PLC communication module can encode the image to obtain a carrier signal and transmit the carrier signal to the PLC host via a signal bus. The FAS system may also include a camera and a PLC communication module. The camera is used to acquire video information, and the PLC communication module can encode the video information to obtain a carrier signal and transmit the carrier signal to the PLC host via a signal bus.

[0109] Please refer to the following: Figure 4 This is a tree-structured FAS diagram provided in this application. Figure 4 As shown, the tree-structured FAS (Fire Protection System) diagram includes a fire control panel and multiple PLC terminal devices deployed on each floor. Figure 4As shown, 1# represents the first floor, 2# represents the second floor, 3# represents the third floor, and so on.

[0110] In this system, PLC communication technology is added to the twisted-pair communication bus (or fire-fighting dual bus) of the fire circuit to increase the bus bandwidth from 100kbps to 1Mbps. A camera is installed on the visual smoke sensor, enabling remote visual monitoring and fire alarm confirmation. This shortens the fire alarm confirmation time for timely rescue and effectively reduces the false alarm rate. However, fire circuits can reach lengths of up to 1500 meters and have numerous branching points, causing carrier signal attenuation during transmission. At two-way branching (i.e., one input corresponds to two outputs), the carrier power distribution is 3dB, which limits the PLC transmission distance.

[0111] For example, when the fire protection cable is 1500 meters long, the transmission bandwidth of the carrier is 1 Mbps. After the carrier signal attenuates, a relay proxy node (Proxy Coordinator, PCO) will be generated at the end of the PLC terminal equipment. The relay PCO may cause the bandwidth of the PLC logic level 2 node to be halved, and the bandwidth of the level 3 node to be reduced to 1 / 4, thus failing to meet the requirement of the PLC transmitting 1 Mbps fire protection video over a 1500-meter cable.

[0112] This application provides a PLC system in which a carrier director is installed at the bifurcation point. The PLC host can control the transmission path of the carrier signal by controlling the carrier director, thereby minimizing the number of nodes between the PLC host and the PLC terminal equipment and reducing carrier signal attenuation.

[0113] To clearly illustrate the technical solution and its effects, the present application will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the application.

[0114] Please refer to Figure 5 This application provides a PLC system. The system may include: a PLC host 50, a first carrier waveguide 51, a first group of PLC terminal devices 52, and a second group of PLC terminal devices 53. The input terminal of the first carrier waveguide 51 is connected to the output terminal of the PLC host 50 via a signal bus. The first carrier waveguide 51 is also connected to the first group of PLC terminal devices 52 via a signal bus, and the second output terminal of the first carrier waveguide 51 is connected to the second group of PLC terminal devices 53 via a signal bus.

[0115] It should be noted that this application embodiment takes the application of a PLC system in a fire protection system as an example. The PLC host 50 is the fire protection host, and the PLC terminal equipment includes video capture devices, smoke sensors, audible and visual alarms, manual alarm devices, temperature sensors, and fire display screens, etc. When the PLC system is a fire protection system installed in a high-rise building, the first carrier wave director 51 is a branch point on the main fire protection line connecting the first and second floors. The first group of PLC terminal equipment can be multiple fire detectors installed on the first floor, and the second group of PLC detectors can be multiple fire detectors installed on the second floor.

[0116] The PLC host 50 can be used to plan the carrier transmission line, generate carrier control signals according to the carrier transmission line, and send the carrier control signals from the output terminal of the PLC host 50. Since the output terminal of the PLC host 50 is connected to the input terminal of the first carrier director 51, the first carrier director 51 can receive the carrier control signals. The carrier control signals are used to indicate the transmission path connecting the PLC host and the PLC terminal device indicated by the carrier transmission line.

[0117] The first carrier director 51 can be used to receive carrier control empty signals and, in response to carrier control signals, connect the transmission path between the PLC host and the PLC terminal device indicated by the carrier transmission line.

[0118] For example, a PLC system may include multiple carrier directors. Specifically, a PLC system may include two carrier directors; please refer to [reference needed]. Figure 6A This is a PLC system provided in an embodiment of this application. For example... Figure 6A As shown, the PLC host 50 is connected to the first carrier director 51, which can connect to the first group of PLC terminal devices 52, the second group of PLC terminal devices 53, and the second carrier director 54. The second carrier director 54 is connected to the third group of PLC terminal devices 55.

[0119] As another example, a PLC system may include multiple carrier directors. Consider a PLC system installed in a building with multiple floors, assuming a set of PLC terminal devices is installed on each floor. Please refer to... Figure 6B This is a PLC system provided in an embodiment of this application. For example... Figure 6B As shown, the PLC host 50 is connected to the first carrier director 51. The first carrier director 51 can connect to the first group of PLC terminal devices 52, the second group of PLC terminal devices 53, and the second carrier director 54. The second carrier director 54 is connected to the third group of PLC terminal devices, and so on. The Nth carrier director is connected to the Mth group of PLC terminal devices.

[0120] As another example, a PLC system may include multiple carrier directors. Figure 4 Taking the FAS system shown as an example, a carrier director is installed at each bifurcation point. Please refer to... Figure 6C This is a PLC system provided in an embodiment of this application. For example... Figure 6C As shown, the PLC host 50 is connected to the first carrier director 51, which can connect to the first group of PLC terminal devices 52 and the second carrier director 54. The second carrier director 54 connects to the second group of PLC terminal devices 53 and the third carrier director 56. The third carrier director 56 connects to the third group of PLC terminal devices 55 and the fourth group of PLC terminal devices 57, and so on. The Nth carrier director is connected to the Mth group of PLC terminal devices.

[0121] Understandably, the function of the PLC host is to plan the carrier transmission line, generate carrier control signals based on the carrier transmission line, and send the carrier control signals from the output terminal of the PLC host 50. The function of the first carrier director is to receive the carrier control signal and, in response to the carrier control signal, connect the transmission path between the PLC host and the PLC terminal device indicated by the carrier transmission line.

[0122] It should be noted that the PLC host may include a PLC communication module (or PLC headend communication module), a computing gateway, and a low-speed bus driver. The PLC communication module is used to encode the signals to be transmitted, or to decode received PLC signals. The computing gateway includes a PLC physical topology diagram, which shows the locations of PLC terminal modules, carrier directors, and low-speed bus access control modules. This allows the PLC host to calculate the transmission nodes between the PLC host and PLC terminal devices through the computing network, thereby planning the transmission line. The low-speed bus driver is a low-speed communication bus used to transmit switch alarm signals. Due to its low transmission rate, the PLC host can obtain switch information from PLC terminal devices and control the input / output modules of the fire alarm terminal through the low-speed bus driver.

[0123] For example, the PLC communication module may include a Media Access Control (MAC) and a Physical Layer Circuit (PHY) communication module.

[0124] Before establishing the topology, device models, low-speed bus addresses, and ports can be defined. For example... Figure 6BTaking the PLC system shown as an example, the communication port of the PLC host is defined as P1, the low-speed bus address code of the carrier director is 1, and there are three communication ports: P1, P2, and P3. Taking the PLC terminal device as an intelligent smoke detector as an example, the low-speed bus address code of intelligent smoke detector 1 is 4, and its communication port number is P1.

[0125] Each PLC terminal device and carrier guide on the fire protection circuit network has a low-speed bus address code during the system construction phase. The physical location and address code of each PLC terminal device and carrier guide installed on the bus can be recorded and linked. Furthermore, the connection relationship between the branch port number of the guide encoder and the PLC terminal device / guide encoder at the opposite end can be recorded. Finally, the information is imported into the edge computing gateway and stored in a table format in the PLC host's PLC physical topology diagram library. Table 1 below is a schematic diagram of a PLC physical topology provided in an embodiment of this application.

[0126] Table 1: Schematic diagram of PLC physical topology

[0127] Local device name Local address encoding Local port number peer device name peer address encoding peer port number PLC main unit 244 P1 Carrier Director 1 1 P1 Carrier Director 1 1 P1 PLC main unit 244 P1 Carrier Director 1 1 P2 Carrier Director 2 2 P1 Carrier Director 1 1 P3 Smart Smoke Detector 3 3 P1 Carrier Director 1 1 P3 Smart Smoke Detector 5 5 P1 Carrier Director 1 1 P3 Smart Smoke Detector 6 6 P1 Carrier Director 1 1 P3 Smart Smoke Detector 7 7 P1

[0128] Understandably, the first carrier director is used to control the carrier transmission path at the bifurcation point. Multiple carrier paths can be configured in the first carrier director. For example, the first carrier director may include a first carrier path and a second carrier path. The first end of the first carrier path is connected to the output of the PLC host, and the second end of the first carrier path is connected to a first group of PLC terminal devices. The first end of the second carrier path is connected to the output of the PLC host, and the second end of the second carrier path is connected to a second group of PLC terminal devices.

[0129] When the first carrier director is connected to other PLC terminal devices or carrier directors, the first carrier director can include more carrier paths. For example, the first carrier director can also include a third carrier path, through which it can connect to a third group of PLC terminal devices. As another example, the first carrier director can also include a third carrier path, through which it can connect to a second carrier director.

[0130] For example, consider sending a PLC carrier signal from a PLC host to a PLC terminal device. The PLC host is further configured to: encode the first transmission information using PLC technology to obtain a first PLC carrier signal. The PLC host can acquire the physical topology of multiple PLC terminal devices in the PLC system, and plan the carrier transmission line based on the physical topology and the PLC terminal device in the PLC system that needs to receive the first PLC carrier signal. After the PLC host completes the transmission path planning, it sends the transmission path to the first carrier director, connecting the first carrier director to the transmission path between the PLC host and the PLC terminal device indicated by the carrier transmission line. In this way, the PLC host sends the first PLC carrier signal from its output. The first carrier signal is transmitted to the branch point on the signal bus (i.e., the first carrier director), which can connect the PLC host and the PLC terminal device according to the transmission line, so that the first carrier signal does not experience power attenuation when passing through the nodes of the signal bus, effectively ensuring the transmission of the carrier signal on the signal bus.

[0131] Specifically, when the carrier control signal indicates that the transmission path between the PLC host and the first group of PLC terminal devices is connected, that is, when the PLC host and the first group of PLC terminal devices are connected, the first carrier director connects the transmission path on the first carrier path, allowing the transmission of PLC carrier signals on the first carrier path, and disconnects the transmission path on the second carrier path, preventing the transmission of PLC carrier signals on the second carrier path.

[0132] For example, consider the PLC host receiving a PLC carrier signal from a PLC terminal device. The PLC host can obtain the physical topology of multiple PLC terminal devices in the PLC system. Based on the physical topology and the PLC terminal device in the PLC system that needs to receive the first PLC carrier signal, the PLC host plans the carrier transmission path. After planning the transmission path, the PLC host sends the transmission path to the first carrier director, connecting the PLC host to the transmission path indicated by the carrier transmission line. In this way, the PLC host can receive the second PLC carrier signal sent by the PLC terminal device. The second carrier signal is transmitted to the branch point on the signal bus (i.e., the first carrier director), which can connect the PLC host and the PLC terminal device according to the transmission line. This ensures that the second carrier signal does not experience power attenuation when passing through the nodes of the signal bus, effectively guaranteeing the transmission of the carrier signal on the signal bus.

[0133] Specifically, when the carrier control signal indicates that the transmission path between the PLC host and the second group of PLC terminal devices is connected, that is, when the PLC host and the second group of PLC terminal devices are connected, the first carrier director connects the transmission path on the second carrier path, allowing the transmission of PLC carrier signals on the second carrier path, and disconnects the transmission path on the first carrier path, preventing the transmission of PLC carrier signals on the first carrier path.

[0134] In one embodiment, both the first carrier path and the second carrier path include a first switch, a second switch, and a carrier blocker. The first switch is connected in series with the carrier blocker, and the second switch is connected in parallel with a series circuit consisting of the first switch and the carrier blocker.

[0135] Please refer to Figure 7A This is a schematic diagram of the structure of the first carrier waveguide 51 provided in an embodiment of this application. Figure 7A As shown, the first carrier director 51 includes a first carrier path 511 and a second carrier path 512. The first carrier path 511 includes a first switch K1 and a carrier wave blocker L1 connected in series, and a second switch K2 is connected in parallel with the circuit of the first switch K1 and the carrier wave blocker L1 connected in series. The second carrier path 512 includes a third switch K3 and a carrier wave blocker L2 connected in series, and a fourth switch K4 is connected in parallel with the circuit of the third switch K3 and the carrier wave blocker L2 connected in series. When the first switch K1 is closed and the second switch K2 is open, the branch containing the first switch K2 is in a conducting state, allowing power signals other than the carrier signal to be transmitted through the branch of the first switch K1. When the first switch K1 is open and the second switch K2 is closed, the carrier signal can be transmitted through the branch of the second switch K2.

[0136] Specifically, the first carrier guide is used to: close the second switch in the first carrier path and open the first switch in the first carrier path when the carrier control signal indicates the transmission path connecting the PLC host and the first group of PLC terminal devices, so that the first carrier path can transmit PLC carrier signals; and open the second switch in the second carrier path and close the first switch in the second carrier path, so that the second carrier path cannot transmit PLC carrier signals.

[0137] When the carrier control signal indicates the transmission path connecting the PLC host and the second group of PLC terminal devices, the second switch in the second carrier path is closed, and the first switch in the second carrier path is opened, allowing the transmission of PLC carrier signals in the second carrier path; and the second switch in the first carrier path is opened, and the first switch in the first carrier path is closed, disallowing the transmission of PLC carrier signals in the first carrier path.

[0138] It should be noted that in the PLC system of the above example, the PLC host 50 has a pre-defined physical topology of multiple PLC terminal devices. This allows the PLC host to determine the location of the PLC terminal device receiving the carrier signal based on the physical topology, and to plan the transmission line accordingly. If the carrier director in the PLC system can determine the transmission path of the carrier signal based on the destination address in the carrier signal, then the PLC host does not need to plan the transmission path between the PLC terminal device and the PLC host.

[0139] For example, such as Figure 7B As shown, the PLC system may include: a PLC host 50, a first carrier waveguide 51, a first group of PLC terminal devices 52, and a second group of PLC terminal devices 53. The input terminal of the first carrier waveguide 51 is connected to the output terminal of the PLC host 50 via a signal bus. The first carrier waveguide 51 is connected to the first group of PLC terminal devices 52 via a signal bus, and the second output terminal of the first carrier waveguide 51 is connected to the second group of PLC terminal devices 53 via a signal bus.

[0140] The first carrier director 51 includes a PLC controller 513, a first carrier channel 511, and a second carrier channel 512. The output of the PLC host 50 is connected to the input of the PLC controller 513, and the output of the PLC controller 513 is connected to the first end of the first carrier channel 511. The output of the PLC controller 513 is also connected to the first end of the second carrier channel 512. The second end of the first carrier channel 511 is connected to a first group of PLC terminal devices, and the second end of the second carrier channel 512 is connected to a second group of PLC terminal devices.

[0141] Specifically, the PLC host 50 can use PLC technology to encode and generate a carrier signal, which is then emitted from its output. This carrier signal includes a destination address, for example, the identifier of the first PLC terminal device. Since the output of the PLC host 50 is connected to the input of the first carrier waveguide 51, the first carrier waveguide 51 can receive the carrier signal and parse it to obtain the identifier of the first PLC terminal device. The first carrier waveguide 51 includes a topology diagram of the first group of PLC terminal devices and the second group of PLC terminal devices. Based on this topology diagram, the first carrier waveguide can determine the transmission path of the first PLC terminal device and connect the transmission path between the PLC host and the first PLC terminal device.

[0142] Understandably, the PLC controller 513 of the first carrier director 51 may include a topology diagram of the first group of PLC terminal devices and the second group of PLC terminal devices, enabling the first carrier director 51 to determine the transmission path of the first PLC terminal device based on the target address (the identifier of the first PLC terminal device). For example, if the first PLC terminal device belongs to the first group of PLC terminal devices, the first carrier director connects the PLC host and the first group of PLC terminal devices through the first output terminal. As another example, if the first PLC terminal device belongs to the second group of PLC terminal devices, the first carrier director connects the PLC host and the second group of PLC terminal devices through the second output terminal.

[0143] The first carrier waveguide 51 can receive carrier signals from the PLC host 50 and parse the carrier signals to obtain the destination address. The first carrier waveguide 51 determines the location of the PLC terminal device corresponding to the destination address based on a preset topology diagram of the PLC terminal devices, thus establishing a transmission path connecting the PLC host and the PLC terminal device corresponding to the destination address.

[0144] It should be noted that the first carrier channel 511 and the second carrier channel 512 have the same structure. Both the first carrier channel and the second carrier channel include a first switch, a second switch, and a carrier wave blocker. The first switch is connected in series with the carrier wave blocker, and the second switch is connected in parallel with the series circuit composed of the first switch and the carrier wave blocker. The PLC controller in the first carrier conductor 51 is used to control the first carrier channel 511 and the second carrier channel 512.

[0145] If the destination address in the carrier signal is the identifier of the first PLC terminal device, the first PLC terminal device belongs to the first group of PLC terminal devices. The PLC controller in the first carrier director can control the first switch in the first carrier path to be in the open state and the second switch to be in the closed state; and control the first switch in the second carrier path to be in the closed state and the second switch to be in the open state.

[0146] If the destination address in the carrier signal is the identifier of the first PLC terminal device, the first PLC terminal device belongs to the second group of PLC terminal devices. The PLC controller in the first carrier director can control the first switch in the first carrier path to be in a closed state and the second switch to be in an open state; and control the first switch in the second carrier path to be in an open state and the second switch to be in a closed state.

[0147] It should be noted that the carrier wave blocker in the embodiments of this application can be a wave blocker element, an inductor element, or a magnetic ring, etc., used to block the transmission of carrier signals.

[0148] Please refer to Figure 8This is a PLC system provided in an embodiment of this application. For example... Figure 8 As shown, the carrier director includes a first carrier path and a second carrier path.

[0149] This application also provides a method for transmitting power line carrier signals in a PLC, which can be applied to the aforementioned PLC system. For example... Figure 9 The diagram shows a flowchart of a PLC carrier signal transmission method. This method may include:

[0150] Step 901: The PLC host can plan the wave transmission line and generate a carrier control signal according to the carrier transmission line.

[0151] The PLC host can be configured with a physical topology diagram, allowing it to determine the transmission line based on the location of the terminal device transmitting PLC signals and the PLC host itself.

[0152] When the PLC host sends a carrier signal to the PLC terminal device through the transmission line, the PLC host can also use PLC technology to encode the first transmitted information to obtain the first PLC carrier signal.

[0153] Step 902: The PLC host sends a carrier control signal through the output terminal of the PLC host.

[0154] In this configuration, the output terminal of the PLC host is connected to the input terminal of the carrier director, so the carrier control signal output by the PLC host can be directly transmitted to the first carrier director.

[0155] Step 903: The first carrier director receives the carrier control signal and connects the transmission path between the PLC host and the PLC terminal device indicated by the carrier transmission line according to the carrier control signal.

[0156] Understandably, the PLC host can also receive a second PLC carrier signal from the PLC terminal device via a carrier transmission line.

[0157] This application also provides a PLC system, such as... Figure 10 The diagram shown is a structural block diagram of a PLC system provided in an embodiment of this application. Figure 10As shown, the PLC host includes: an image display controller 1001, an AI model 1002, a fire alarm linkage controller 1003, and a PLC communication module 1004. The first carrier wave director includes a first carrier channel and a second carrier channel. The first group of PLC terminal devices includes smoke sensors, manual alarm buttons, temperature sensors, audible and visual alarms, and other sensors; this first group of PLC terminal devices can be installed in the PLC system via intelligent sensor sockets. The second group of PLC terminal devices includes gas extinguishing equipment, fire water supply equipment, fireproof rolling shutter equipment, and fire door equipment, etc. This second group of PLC terminal devices can be installed in the PLC system via I / O (input / output) ports.

[0158] It is understood that, in order to achieve the aforementioned functions, the electronic device includes corresponding hardware structures and / or software modules for performing each function. Those skilled in the art should readily recognize that, based on the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein, the embodiments of this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed by hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this application.

[0159] This application embodiment can divide the above-described electronic device into functional modules based on the method example described above. For example, each function can be divided into its own functional modules, or two or more functions can be integrated into one processing module. The integrated modules can be implemented in hardware or as software functional modules. It should be noted that the module division in this application embodiment is illustrative and only represents one logical functional division; other division methods may be used in actual implementation.

[0160] This application provides a PLC host, such as... Figure 11 As shown, the PLC host may include: a generation module 1101, a transmission module 1102, and an encoding module 1103.

[0161] The generation module 1101 can be used to plan the carrier transmission line of the PLC host and generate carrier control signals according to the carrier transmission line.

[0162] The transmission module 1102 can be used to enable the PLC host to send a carrier control signal through the output terminal of the PLC host, wherein the carrier control signal is used to indicate the carrier transmission path between the PLC host and the PLC terminal device indicated by the carrier transmission line.

[0163] Understandably, the encoding module 1103 can be used by the PLC host to encode the first transmission information using PLC technology to obtain the first PLC carrier signal. The generation module is specifically used by the PLC host to acquire the physical topology of multiple PLC terminal devices in the PLC system, and to plan the carrier transmission line based on the physical topology and the PLC terminal devices in the PLC system that are to receive the first PLC carrier signal.

[0164] For example, the transmission module is also used for the PLC host to send a first PLC carrier signal from the output of the PLC host.

[0165] As another example, the transmission module is also configured to allow the PLC host to receive a second PLC carrier signal from the PLC terminal device via a carrier transmission line.

[0166] This application also provides a carrier director, such as Figure 12 As shown, the carrier wave director may include a receiving module 1201 and a PLC control module 1202.

[0167] The receiving module 1201 can be used to receive carrier control signals from the PLC host, which are used to indicate the transmission path connecting the PLC host and the PLC terminal device.

[0168] The PLC control module 1202 can be used to connect the transmission path between the PLC host and the PLC terminal equipment according to the carrier control signal.

[0169] For example, the carrier control signal includes control information for the carrier director. The PLC control module is used to determine the carrier path of the first carrier director based on the control information of the carrier director, so as to connect the transmission path between the PLC host and the PLC terminal device.

[0170] For example, the carrier control signal includes the identifier of the PLC terminal device. The PLC control module is used to determine the carrier path corresponding to the PLC terminal device based on the identifier of the PLC terminal device and a preset PLC topology diagram, and to connect the transmission path between the PLC host and the PLC terminal device.

[0171] This application also provides a computer program product that, when run on a computer, causes the computer to perform the various functions or steps performed by the mobile phone in the above method embodiments.

[0172] Through the above description of the embodiments, those skilled in the art can clearly understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0173] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0174] The units described as separate components may or may not be physically separate. A component shown as a unit can be one or more physical units; that is, it can be located in one place or distributed in multiple different locations. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0175] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0176] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solutions of the embodiments of this application, essentially or in other words, the parts that contribute to the prior art, or all or part of the technical solutions, can be embodied in the form of a software product. This software product is stored in a storage medium and includes several instructions to cause a device (which may be a microcontroller, chip, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0177] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power line carrier communication PLC system, characterized in that, include: PLC host, first carrier wave director, first group of PLC terminal equipment and second group of PLC terminal equipment; The input terminal of the first carrier waveguide is connected to the output terminal of the PLC host via a signal bus; the first output terminal of the first carrier waveguide is connected to the first group of PLC terminal devices via a signal bus; and the second output terminal of the first carrier waveguide is connected to the second group of PLC terminal devices via a signal bus. The PLC host is used to: send a carrier control signal from the output terminal, the carrier control signal being used to indicate the transmission path connecting the PLC host and the PLC terminal device; wherein, the PLC terminal device belongs to the first group of PLC terminal devices, or, the PLC terminal device belongs to the second group of PLC terminal devices; The first carrier director is used to: receive the carrier control signal and connect the transmission path between the PLC host and the PLC terminal device according to the carrier control signal; The first carrier director includes a first carrier path and a second carrier path; both the first carrier path and the second carrier path include a first switch, a second switch and a carrier wave blocker; the first switch is connected in series with the carrier wave blocker, and the second switch is connected in parallel with a series circuit composed of the first switch and the carrier wave blocker. The first carrier director is further configured to: when the carrier control signal indicates a transmission path connecting the PLC host and the first group of PLC terminal devices, close the second switch in the first carrier path and open the first switch in the first carrier path, so that the first carrier path is allowed to transmit PLC carrier signals; and open the second switch in the second carrier path and close the first switch in the second carrier path, so that the second carrier path is not allowed to transmit PLC carrier signals. When the carrier control signal indicates a transmission path connecting the PLC host and the second group of PLC terminal devices, the second switch in the second carrier path is closed, and the first switch in the second carrier path is opened, allowing the second carrier path to transmit PLC carrier signals; and the second switch in the first carrier path is opened, and the first switch in the first carrier path is closed, disallowing the first carrier path from transmitting PLC carrier signals.

2. The PLC system according to claim 1, characterized in that, The carrier control signal includes control information for the carrier director; The first carrier director is used to: determine the carrier path of the first carrier director according to the control information of the carrier director, so as to connect the transmission path between the PLC host and the PLC terminal device.

3. The PLC system according to claim 1, characterized in that, The carrier control signal includes the identifier of the PLC terminal device; The first carrier director is used to: determine the carrier path corresponding to the PLC terminal device according to the identifier of the PLC terminal device and the preset PLC topology, and connect the transmission path between the PLC host and the PLC terminal device.

4. The PLC system according to claim 2, characterized in that, The PLC host is also used to plan the transmission path between the PLC host and the PLC terminal device according to the preset PLC topology and the carrier path where the PLC terminal device is located, and generate the carrier control signal according to the transmission path.

5. The PLC system according to claim 4, characterized in that, The first end of the first carrier path is connected to the output of the PLC host, and the second end of the first carrier path is connected to the first group of PLC terminal devices; the first end of the second carrier path is connected to the output of the PLC host, and the second end of the second carrier path is connected to the second group of PLC terminal devices.

6. The PLC system according to claim 5, characterized in that, When the PLC terminal device belongs to the first group of PLC terminal devices, the first carrier director is specifically used to: connect the transmission path on the first carrier path to allow the transmission of PLC carrier signals on the first carrier path, and disconnect the transmission path on the second carrier path to prevent the transmission of PLC carrier signals on the second carrier path. When the PLC terminal device belongs to the second group of PLC terminal devices, the first carrier director is specifically used to: connect the transmission path on the second carrier path to allow the transmission of PLC carrier signals on the second carrier path, and disconnect the transmission path on the first carrier path to prevent the transmission of PLC carrier signals on the first carrier path.

7. The PLC system according to claim 1, characterized in that, The carrier wave blocker is a wave blocker element, an inductor element, or a magnetic ring.

8. The PLC system according to any one of claims 4-6, characterized in that, The PLC system also includes: a second carrier wave director and a third set of PLC terminal devices; The input terminal of the second carrier director is connected to the third output terminal of the first carrier director via a signal bus; the output terminal of the second carrier director is connected to the third group of PLC terminal devices. The second carrier director is used to: receive the carrier control signal and connect the transmission path between the PLC host and the PLC terminal device according to the control information of the carrier director.

9. The PLC system according to claim 8, characterized in that, The second carrier director includes: a third carrier path; The first end of the third carrier path is connected to the third output end of the first carrier director, and the second end of the third carrier path is connected to the third group of PLC terminal devices.

10. The PLC system according to any one of claims 4-6, characterized in that, The PLC host is also used to: encode the first transmission information using PLC technology to obtain a first PLC carrier signal, and send the first PLC carrier signal from the output terminal of the PLC host; The first PLC carrier signal is transmitted to the PLC terminal device through the transmission path.

11. The PLC system according to any one of claims 4-6, characterized in that, The PLC host is also used to: receive a second PLC carrier signal from the PLC terminal device through the transmission path.

12. The PLC system according to any one of claims 4-6, characterized in that, Each group of PLC terminal devices includes one or more PLC terminal devices; The PLC terminal equipment includes: a video acquisition unit, a smoke sensor, an audible and visual alarm, a manual alarm device, a temperature sensor, and a fire display.

13. The PLC system according to claim 2 or 4, characterized in that, The carrier control signal also includes a first PLC carrier signal, which is used to instruct the PLC terminal device to transmit video or audio signals to the PLC host.

14. The PLC system according to claim 1 or 3, characterized in that, The carrier control signal further includes a first PLC carrier signal, which includes video information or audio information; wherein, the first PLC carrier signal is used to instruct the PLC terminal device to display the video information or audio information in the first PLC carrier signal; The PLC terminal device is used to receive the carrier control signal, parse the carrier control signal to obtain the video information or audio information, and display the video information or play the audio information.

15. A method for transmitting power line carrier communication PLC carrier signals, characterized in that, include: The PLC host sends a carrier control signal through its output terminal, wherein the carrier control signal is used to indicate the carrier transmission path connecting the PLC host and the PLC terminal device; The first carrier director receives the carrier control signal and connects the transmission path between the PLC host and the PLC terminal device according to the carrier control signal; The first carrier director includes a first carrier path and a second carrier path; both the first carrier path and the second carrier path include a first switch, a second switch, and a carrier blocker; the first switch is connected in series with the carrier blocker, and the second switch is connected in parallel with a series circuit composed of the first switch and the carrier blocker; the first carrier director selects the transmission path by switching the conduction state of the first carrier path and the second carrier path. The first carrier director selects the transmission path by switching the conduction states of the first carrier path and the second carrier path, including: when the carrier control signal indicates a transmission path connecting the PLC host and the first group of PLC terminal devices, closing the second switch in the first carrier path and opening the first switch in the first carrier path, allowing the first carrier path to transmit PLC carrier signals; and opening the second switch in the second carrier path and closing the first switch in the second carrier path, disallowing the second carrier path from transmitting PLC carrier signals; when the carrier control signal indicates a transmission path connecting the PLC host and the second group of PLC terminal devices, closing the second switch in the second carrier path and opening the first switch in the second carrier path, allowing the second carrier path to transmit PLC carrier signals; and opening the second switch in the first carrier path and closing the first switch in the first carrier path, disallowing the first carrier path from transmitting PLC carrier signals.

16. The method according to claim 15, characterized in that, The carrier control signal includes control information for the carrier director; The first carrier director determines the carrier path of the first carrier director according to the control information of the carrier director, so as to connect the transmission path between the PLC host and the PLC terminal device.

17. The method according to claim 15, characterized in that, The carrier control signal includes the identifier of the PLC terminal device; The first carrier director determines the carrier path corresponding to the PLC terminal device based on the identifier of the PLC terminal device and the preset PLC topology, and connects the transmission path between the PLC host and the PLC terminal device.

18. The method according to claim 16, characterized in that, Before the PLC host plans the carrier transmission path and generates the carrier control signal based on the carrier transmission path, the method further includes: The PLC host uses PLC technology to encode the first transmission information to obtain the first PLC carrier signal; The PLC host obtains the PLC topology and plans the carrier transmission path based on the PLC topology and the PLC terminal devices in the PLC system that are to receive the first PLC carrier signal.

19. The method according to claim 18, characterized in that, The method further includes: The PLC host sends the first PLC carrier signal from its output terminal.

20. The method according to claim 18, characterized in that, The method further includes: The PLC host receives a second PLC carrier signal from the PLC terminal device through the carrier transmission path.

21. A method for transmitting power line carrier communication PLC carrier signals, characterized in that, include: Receive a carrier control signal from the PLC host, the carrier control signal being used to indicate the transmission path connecting the PLC host and the PLC terminal device; According to the carrier control signal, the transmission path between the PLC host and the PLC terminal device is connected by controlling the closed state of the first switch and the second switch; When the carrier control signal indicates the transmission path connecting the PLC host and the first group of PLC terminal devices, the second switch in the first carrier path is closed and the first switch in the first carrier path is opened, so that the first carrier path can transmit PLC carrier signals. And disconnect the second switch in the second carrier path and close the first switch in the second carrier path, so that the second carrier path is not allowed to transmit PLC carrier signals; When the carrier control signal indicates the transmission path connecting the PLC host and the second group of PLC terminal devices, the second switch in the second carrier path is closed, and the first switch in the second carrier path is opened, so that the second carrier path is allowed to transmit PLC carrier signals; and the second switch in the first carrier path is opened, and the first switch in the first carrier path is closed, so that the first carrier path is not allowed to transmit PLC carrier signals. Wherein, the PLC terminal device belongs to the first group of PLC terminal devices, or the PLC terminal device belongs to the second group of PLC terminal devices; the first carrier path connects the PLC host to the first group of PLC terminal devices, and the second carrier path connects the PLC host to the second group of PLC terminal devices; both the first carrier path and the second carrier path include a first switch, a second switch, and a carrier wave blocker; the first switch is connected in series with the carrier wave blocker, and the second switch is connected in parallel with a series circuit composed of the first switch and the carrier wave blocker.

22. The method according to claim 21, characterized in that, The carrier control signal includes control information for the carrier director; The transmission path connecting the PLC host and the PLC terminal device according to the carrier control signal includes: The carrier path of the first carrier director is determined based on the control information of the carrier director, so as to connect the transmission path between the PLC host and the PLC terminal device.

23. The method according to claim 22, characterized in that, The carrier control signal includes the identifier of the PLC terminal device; The transmission path connecting the PLC host and the PLC terminal device according to the carrier control signal includes: Based on the identifier of the PLC terminal device and the preset PLC topology diagram, the carrier path corresponding to the PLC terminal device is determined, and the transmission path between the PLC host and the PLC terminal device is connected.

24. A PLC main unit, characterized in that, include: A generation module and a transmission module; the generation module is used to generate carrier control signals; The transmission module is used to send the carrier control signal through the output terminal of the PLC host, wherein the carrier control signal is used to indicate the carrier transmission path connecting the PLC host and the PLC terminal device; The transmission module is specifically used to, when the carrier control signal indicates the transmission path connecting the PLC host and the first group of PLC terminal devices, close the second switch in the first carrier path and open the first switch in the first carrier path, so that the first carrier path is allowed to transmit PLC carrier signals; and open the second switch in the second carrier path and close the first switch in the second carrier path, so that the second carrier path is not allowed to transmit PLC carrier signals. When the carrier control signal indicates the transmission path connecting the PLC host and the second group of PLC terminal devices, the second switch in the second carrier path is closed, and the first switch in the second carrier path is opened, so that the second carrier path is allowed to transmit PLC carrier signals; and the second switch in the first carrier path is opened, and the first switch in the first carrier path is closed, so that the first carrier path is not allowed to transmit PLC carrier signals. Wherein, the PLC terminal device belongs to the first group of PLC terminal devices, or the PLC terminal device belongs to the second group of PLC terminal devices; the first carrier path connects the PLC host to the first group of PLC terminal devices, and the second carrier path connects the PLC host to the second group of PLC terminal devices; both the first carrier path and the second carrier path include a first switch, a second switch, and a carrier wave blocker; the first switch is connected in series with the carrier wave blocker, and the second switch is connected in parallel with a series circuit composed of the first switch and the carrier wave blocker.

25. The PLC main unit according to claim 24, characterized in that, The generation module is used to plan a carrier transmission path and generate a carrier control signal based on the carrier transmission path.

26. The PLC main unit according to claim 25, characterized in that, The PLC host also includes an encoding module; The encoding module is used to encode the first transmission information using PLC technology to obtain a first PLC carrier signal; The generation module is specifically used to obtain the PLC topology and, based on the PLC topology and the PLC terminal device in the PLC system that is to receive the first PLC carrier signal, plan the carrier transmission path.

27. The PLC main unit according to claim 24, characterized in that, The transmission module is also used to send a first PLC carrier signal from the output terminal of the PLC host.

28. The PLC main unit according to claim 27, characterized in that, The transmission module is also used to receive a second PLC carrier signal from the PLC terminal device through the carrier transmission path.

29. A carrier wave director, characterized in that, The carrier director includes: a receiving module and a power line carrier communication PLC control module; The receiving module is used to receive a carrier control signal from the PLC host, the carrier control signal being used to indicate the transmission path connecting the PLC host and the PLC terminal device; wherein the PLC terminal device belongs to a first group of PLC terminal devices, or the PLC terminal device belongs to a second group of PLC terminal devices; The PLC control module is used to connect the transmission path between the PLC host and the PLC terminal device according to the carrier control signal; The carrier guide further includes: a first carrier path and a second carrier path; both the first carrier path and the second carrier path include a first switch, a second switch, and a carrier blocker; the first switch is connected in series with the carrier blocker, and the second switch is connected in parallel with a series circuit composed of the first switch and the carrier blocker; the PLC control module is further configured to: when the carrier control signal indicates a transmission path connecting the PLC host and the first group of PLC terminal devices, close the second switch in the first carrier path and open the first switch in the first carrier path, allowing the first carrier path to transmit PLC carrier signals; and open the second switch in the second carrier path and close the first switch in the second carrier path, disallowing the second carrier path from transmitting PLC carrier signals; when the carrier control signal indicates a transmission path connecting the PLC host and the second group of PLC terminal devices, close the second switch in the second carrier path and open the first switch in the second carrier path, allowing the second carrier path to transmit PLC carrier signals; and open the second switch in the first carrier path and close the first switch in the first carrier path, disallowing the first carrier path from transmitting PLC carrier signals.

30. The carrier wave director according to claim 29, characterized in that, The carrier control signal includes control information for the carrier director; The PLC control module is used to determine the carrier path of the first carrier director based on the control information of the carrier director, so as to connect the transmission path between the PLC host and the PLC terminal device.

31. The carrier wave director according to claim 29, characterized in that, The carrier control signal includes the identifier of the PLC terminal device; The PLC control module is used to determine the carrier path corresponding to the PLC terminal device based on the identifier of the PLC terminal device and the preset PLC topology diagram, and to connect the transmission path between the PLC host and the PLC terminal device.

32. A chip system, characterized in that, The chip system is applied to a power line carrier communication PLC host; the chip system includes one or more interface circuits and one or more processors; the interface circuits and the processors are interconnected via lines; the interface circuits are used to receive signals from the memory of the PLC host and send the signals to the processors, the signals including computer instructions stored in the memory; when the processor executes the computer instructions, the PLC host performs the method as described in any one of claims 15-20.

33. A chip system, characterized in that, The chip system is applied to a first carrier transmitter; the chip system includes one or more interface circuits and one or more processors; the interface circuits and the processors are interconnected via lines; the interface circuits are used to receive signals from the memory of the first carrier transmitter and send the signals to the processors, the signals including computer instructions stored in the memory; when the processor executes the computer instructions, the first carrier transmitter performs the method as described in any one of claims 21-23.

34. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes computer instructions that, when executed on a device, cause the device to perform the transmission method as described in any one of claims 15-20.

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