Abstract: Abstract: This paper introduces a solution for the application of broadband PLC in IoT appliances, and explains the demand characteristics of IoT appliances for PLC communication. Based on the demand characteristics, the main components and functional modules used in the broadband PLC module are selected. Keywords: IoT broadband PLC household appliances; Cross phase coupling; Automatic networking; In phase interference 1 Internet of Things broadband PLC household appliance system and network composition Internet of Things broadband PLC power line carrier communication household appliances are to send some information about the household appliances themselves to the PLC gateway through the power line, and then the PLC gateway sends the data information sent by the household appliances to the desired place through the Internet

Abstract: This paper introduces a solution for applying broadband PLC to IoT appliances, and explains the demand characteristics of IoT appliances for PLC communication. Based on the demand characteristics, the main components and functional modules used in the broadband PLC module are selected.

Keywords: IoT broadband PLC household appliances; Cross phase coupling; Automatic networking; In-phase interference

1. IoT broadband PLC home appliance system and network composition

The Internet of Things broadband PLC power line carrier communication appliance is to send some information of the appliance itself to the PLC gateway through the power line, and then the PLC gateway sends the data information sent by the appliance to the desired place through the Internet. At the same time, it can send the user’s needs to the PLC gateway through the Internet. The PLC gateway sends the demand command data to the PLC appliance through the power line. The appliance runs and feeds back the operation information according to the user’s demand instructions.

IoT broadband PLC home appliance system

The broadband PLC home appliance system network of the Internet of Things includes several parts, including the perception layer, PLC communication layer, network layer, application layer, etc. Its physical composition is shown in Figure 1. Among them, refrigerators, water heaters, and other receiving users can send query and control commands through mobile phones, PADs, computers, and other devices. At the same time, refrigerators, water heaters, and other household appliances can return the required data to mobile phones, PADs, computers, and other devices according to the user’s command information. Due to the built-in PLC modules in the gateway and home appliances, data transmission here is no longer through traditional methods such as wireless or network cables, but directly through power lines. Moreover, due to the use of PLC communication, home appliances such as water heaters and air conditioners can also be designed with display boards separate from the entire machine, which is convenient to operate and can provide users with a comfortable experience.

Characteristics of Power Line Carrier Communication (PLC) IoT Home Appliances

PLC IoT appliances are different from ordinary household appliances and remote meter reading systems. Due to the reliance on power lines for data transmission and the fact that household appliances operate and display directly to users, it is required that each household appliance has appropriate sensing, transmission speed, strong anti-interference ability, interconnection, automatic networking, high communication reliability, and moderate transmission distance.

The appropriate induction and transmission speed are often required for different household appliances, and the data transmission speed is often different. For general household appliances such as water heaters, washing machines, refrigerators, and air conditioners that do not require image or sound transmission, a transmission speed of less than 10k is sufficient. For video devices such as IoT TVs and computers, a transmission rate of several hundred k or more is required.

Strong anti-interference ability generally refers to within a certain range, if there are multiple PLC devices or interference with the same transmission frequency on the power line, each device can communicate normally without being affected by other factors.

Interconnection (M2M) refers to the communication and transmission of relevant information between IoT appliances, as well as between the Internet and IoT appliances. Only in this way can “people be around when they are away from home, and the world is right in front of them when they are at home.”

Automatic networking refers to the use of certain measures to enable home appliances that require interconnection to form a network of their own without networking with PLC devices that do not require networking.

High communication reliability refers to the need for networked appliances to communicate effectively, rather than having to read multiple times due to the low success rate of one communication like remote meter reading. On the other hand, IoT appliances require people to meet their comfort requirements for handling and appreciation.

Moderate transmission distance refers to the general interconnection of household appliances within the same household. If the transmission distance of TRICONEX 3902AX is too far, it is easy to affect other users when there are many users. However, if it is controlled within 200 meters, it will not have too much impact on the use of other users.

Design of 3 IoT Broadband PLC Home Appliance Systems

Based on the characteristics of PLC IoT appliances, the most core technology is PLC communication technology. This design implementation plan mainly discusses how to achieve interconnection and intercommunication of appliances through PLC communication in IoT appliances from the following aspects.

3.1 Hardware composition of IoT PLC household appliances

Hardware composition of IoT home appliances

Hardware composition of IoT home appliances

The IoT PLC household appliances referred to in this article refer to household appliances composed of ordinary household appliances and PLC communication modules, and their hardware composition is shown in Figure 2. TVs, refrigerators, etc. can directly integrate PLC communication modules into the interior of household appliances. In addition to integrating the PLC communication module into the entire machine, TRICONEX 3902AX, air heaters, etc. can also separate the operation display board from the whole machine. The operation display board is also embedded with a PLC communication module, so that although the whole machine and the operation display board are separated, data exchange between the display board and the whole machine can still be maintained through PLC communication.

The PLC communication module inside the general machine is responsible for both communicating with its corresponding display board and communicating with the PLC terminal gateway.

The network exchange processing IC is responsible for receiving the data transmitted by INT6400 and converting the data to be transmitted to the RJ45 interface. The business processing IC parses the received data based on the communication protocol and directly transmits the data to the MCU on the home appliance PCB board through the SPI interface or UART interface. At the same time, the data transmitted from the home appliance is packaged and sent to INT6400. The specific module composition diagram is shown in Figure 3.