Through the receiving link, the PLC signal extracted from AC power line is filtered.
Through the transmission link, the PLC signal is power amplified, and then the PLC signal is injected into the AC power line.
Through the PLC controller, the bidirectional conversion between PLC signal and RS485 signal is realized.
Through RS485 transceiver interface circuit, RS485 signal transceiver path is provided to realize communication with data collector.
Working principle of Huawei plc smart home scheme
Huawei plc Smart Home Solution This is a mid-band power line carrier communication technology based on HPLC/IEEE 190 1 combined with Huawei's unique technology, which is oriented to the Internet of Things scene. Its working frequency range is 0.7- 12MHz, with low noise and relatively stable channel quality. Using orthogonal frequency division multiplexing technology, the frequency band utilization rate is high and the anti-interference ability is strong. By modulating the digital signal on the high-frequency carrier, the high-speed and long-distance transmission of data in the power line medium is realized. The communication rate of PLC-IoT application layer is 100Kbps to 2Mbps, and the transmission distance can be extended to several kilometers through multi-level networking. Based on IPv6, it can carry rich Internet of Things protocols, enable intelligent terminal devices and realize full connection of devices.
At the same time, PLC-IoT accurately and effectively establishes the transmission model of power line communication channel, determines the best signal transmission frequency according to the frequency selection characteristics, and obtains the channel characteristics of power line through the analysis of a large number of measured data. Its advantages can be summarized as follows:
1. Based on the open standard IPv6 technology, different types of terminal devices can * * enjoy the PLC network, and the host application of the Internet of Things and multiple applications in the container can * * * enjoy the same PLC network, and independently access the terminal devices managed by them, without affecting each other, thus improving the concurrency and communication efficiency of the PLC network.
Second, based on the new generation area identification technology of China, the transformer area to which the terminal equipment belongs can be automatically analyzed in the local module only through software analysis and processing according to the characteristics of broadband carrier technology, power grid and signal, without any additional equipment. Using the identification results of the undisturbed station area, the white list configuration can be eliminated, thus reducing the on-site configuration and improving the efficiency of equipment deployment.
Third, PLC-IoT+RF dual-mode communication adopts broadband power line carrier and micro-power wireless communication technology. In the scene of high-frequency acquisition, PLC-IoT and RF dual channels collect data from different nodes in parallel, which improves the efficiency by about 40%. When key information interacts, the dual channels can transmit key information at the same time, forming redundant channels and realizing reliable communication. When the equipment is out of power and the PLC link is disconnected, the power failure event can be reported in time through radio frequency communication.
Fourthly, PLC-IoT module cooperates with bypass coupling circuit, which provides another escape channel for PLC-IoT communication. When the power line switch is turned off, the PLC-IoT module can continue to communicate through the bypass coupling unit, and report important information such as power failure events to the Internet of Things gateway, so as to realize active repair after power failure, improve operational efficiency and customer satisfaction, and solve the problem of how to report information and handle it in time after power failure.
5. The combination of 5.PLC-IoT module and edge computing gateway provides a plug-and-play framework. The SDK of the PLC-IoT terminal module is open, and the third-party application can automatically discover its own terminal equipment through simple function calls, and register the service app in the container with the remote Internet of Things platform, so that the Internet of Things gateway and the terminal equipment can quickly establish a service channel, effectively solving the problems of complicated online process and time-consuming installation and deployment of traditional terminal equipment.
PLC- internet of things products:
PLC front end
"IP-based PLC front-end communication module (used with core board)
As the central coordinator of PLC network, responsible for establishing PLC network.
Size: 92.62mm * 67.62mm * 24.5mm PLC miniature tail end
IP-based PLC terminal communication module (integrated in terminal equipment)
As the networking node of PLC network, it is managed by coordinator.
Support the secondary development of partners.
Size: 36mm*27mm* 17.55mm (excluding pins) PLC standardized tail end.
Terminal communication module of PLC based on IP
As the networking node of PLC network, it is managed by coordinator.
Size: 65.5mm*45.3mm*20mm IOT gateway core board
Edge computing core board, supporting virtualization and container technology
Support partners to develop container-based APP applications.
Size: 92.6mm * 80mm *13.9mm.
Huawei PLC solution
With Huawei's intelligent host as the central control system, it has a stable and reliable PLC whole-house network, high-speed and full-coverage whole-house WiFi, supports rich and extensible HarmonyOS System Eco-2 facilities, carries out distributed information management and intelligent decision-making on the whole-house environment, user behavior and system equipment, and brings users an immersive, personalized and growing whole-scene intelligent experience.
The scheme configuration includes PLC hardware enabling devices+scene experience: the hardware includes the whole house intelligent host (including the whole house Wi-Fi6+ system), as well as core PLC hardware enabling devices such as sensors, curtain motors, lighting drivers (including lamps) and control panels. The scene experience includes preset 50+ scenes, including the first batch of HarmonyOS AI scenes (ordinary scenes are scenes set by ifttt preset conditions)
The whole house PLC technology has the advantages of high maturity, high stability, high connectivity, high reliability and easy deployment. At present, it has realized the support of 2000 meters transmission distance, and easily covers large-sized units up to 500 square meters. Huawei's laboratory tests show that the cumulative 1 10,000+hours are not disconnected, the communication success rate is as high as 99.99%, and the network is disconnected under extreme conditions. Extensibility can connect up to 384 devices to meet the expansion needs of a large number of devices in the family.
The other is to realize the whole house Wi-Fi6+ wireless network without dead angle coverage, which is also the superior solution of home broadband. The main routing module of the whole house Wi-Fi6+ includes 1 IPTV, 1 uplink optical cat, 1 PLC, and five multi-room AP extensions with ***8 network ports to realize the whole house Wi-Fi coverage.
What is plc technology?
Before we know what PLC-IoT is, we need to know what PLC is. PLC(PowerLineCommunication) is power line communication, also known as power line network, which refers to the use of existing power lines to transmit data or information through digital signal processing.
PLC does not need networking and additional communication costs, and is also very compatible with the existing street lamp control system. However, PLC is greatly influenced by cable quality and load, and its anti-interference ability to signals is poor.
PLC-IoT (Power Line Communication Internet of Things) has improved PCL, with stronger anti-interference ability and better communication quality. At the same time, digital signals can be modulated on high-frequency carriers, and the transmission distance can be extended to several kilometers through multi-level networking, thus realizing high-speed and long-distance data transmission in power line media.
Simply put, PLC, that is, power line communication (PLC for short) is a carrier communication mode that uses power lines (low voltage, medium voltage or DC) as the medium to transmit data and information.
PLC power line communication technology realizes high-speed, reliable, real-time and long-distance data transmission on power line. Its outstanding feature is that it can realize networking power supply without additional special communication lines. Huawei whole house intelligence is a whole house intelligence system based on Huawei HiSilicon PLC-IoT chip.
The PLC-IoT system can control each device independently, edit the scene according to the requirements, realize the simultaneous control of different products, and realize the linkage control with each device on the HiLink platform. Users can view and control devices remotely or near Huawei Smart Life Applications.
The difference between Huawei whole house intelligent PLC and traditional PLC
Power carrier technology was also applied more than ten years ago, and people like Power Cat have been using this technology.
The essential difference between Huawei whole house intelligent PLC technology and traditional PLC technology lies in the use of protocol, bandwidth technology and transmission data category.
First of all, unlike the PLC technology used by routers and power cats, Huawei's whole house intelligent PLC-IoT is a system based on IEEE1901.1protocol; The technology of router PLC based on the protocol G. HNIEEE1901.1belongs to narrowband technology, with a bandwidth of 1.6MHz- 12MHz, which only transmits control signaling and heartbeat messages, and each device occupies little bandwidth. G.hn technology belongs to broadband technology, because the efficiency of data transmission is completely different. Traditional PLC technology transmits data services, which takes up a lot of bandwidth resources, so it may be disturbed by the noise of other electrical appliances in use, leading to a jump in transmission rate. In some disturbing scenes, it will affect the user experience, which is usually called "failure". However, it is usually used in an open environment without isolators and other measures, which is easy to be disturbed.
As an independent loop, Huawei intelligent PLC-IoT system is connected to the home circuit. In order to reduce the noise generated by blocking traditional household appliances, a filter is installed on the independent loop to block the interference of traditional household appliances to intelligent furniture equipment, thus achieving the requirements of stability and safety. The PLC loop can support up to 384 devices. Smart home PLC technology is a mature technology, which is widely used in industrial scenes such as power grid and street lamps, and the stable communication distance can be as high as 2KM. Huawei applies this technology to home scenes, and the connection stability of equipment can be guaranteed.
What is Huawei PLC?
PLC is just a technical route, just like ZigBee, SigMesh and even the traditional bus technology. Until now, ZigBee and SigMesh have not been separated, and each has its own advantages and disadvantages. When PLC entered the war, compared with the traditional bus technology, ZigBee and SigMesh could not do it.
PLC has proved its "wide area" application value in the application of remote meter reading and street lamp monitoring, but this is almost beyond the reach of all other technical routes. Huawei's ambition lies in the real Internet of Everything, and smart home is only part of it. PLC can meet the application of wide-area intelligent interconnection and home intelligent interconnection almost at the same time, and can take into account the rapid transformation and reconstruction of two business application types at the same time, so it is a "roughly correct" direction. The remaining problem is only the maturity of technology and application.
There is also a very important content that is usually not put on the table, that is, standards, which involve not only interests, but also national and social security, as well as family and personal privacy protection, just like the application of 5G technology.
If ZigBee, SigMesh, KNX and PLC can achieve basically the same interconnection and intelligent effect, the cost performance will not be much different. In the field of social public and large family applications, PLC will become the first choice, which is the comprehensive demand of society.
Giant enterprises do standards and capital, large enterprises do strategies and tactics, medium-sized enterprises do business and channels, and small enterprises do products and technologies. The focus is different, the goal is different, and the result is certainly different.
At least three factors of PLC meet the technical route selection requirements of Huawei Intelligent Interconnection: 1, application field coverage; 2. Brand-new standard setting; 3. Seamless combination of wired and wireless.
On this basis, Huawei emphasizes the HiLink system, and does not completely exclude other types of intelligent technology integration, such as SigMesh, which is also promising to be integrated into Huawei's intelligent interconnection system.
HiLink is the root system, Wi-Fi is the backbone, intelligent interconnection technologies such as PLC and SigMesh are branches, the switch panel socket of the intelligent speaker routing gateway is green leaves, and the terminal application products are in full bloom. Huawei plc Smart Home Scheme This system can make the reality closer to the ideal smart life. In those days, this design would only appear in science fiction stories and movies. As soon as I got home, I automatically opened the curtains, turned on the floor heating and adjusted the light to the right brightness. Anyway, what function I want to achieve, I can directly buy a functional home appliance to access this whole house intelligent system.