What is the PLC power line carrier
The full name of PLC in English is called Power Line Communication. From the literal point of view, we can understand that this is a technology that uses existing power lines to transmit signals through carrier waves. Its biggest feature is that there is no need to re-arrange the network, as long as there is a wire, data transmission can be carried out.
The main disadvantages of PLC technology
Since PLC technology is so cattle, as long as the wire is set up, data communication can be transmitted to where, why do we not use PLC power line technology to access the Internet in daily life, but use ADSL, fiber optics, etc. as broadband access? This is due to some inherent shortcomings of PLC technology that limit its wider application.
1. The distribution transformer has a blocking effect on the power carrier signal, so the power carrier signal can only be transmitted within one distribution transformer area;
2. The electronic line has a large attenuation on the carrier signal, so the general power carrier signal can only be transmitted on the single-phase power line;
3. There are many power devices on the power line, which will cause interference to the carrier signal, and the interference signal power may be much larger than the carrier signal.
In summary, power lines are not an ideal medium for carrier signal transmission, so PLC carrier technology has been limited to applications such as remote meter reading. However, with the construction of smart grid, the interconnection communication between smart home appliances and smart meters provides a new stage for PLC carrier technology, and the major manufacturers are constantly improving the PLC carrier technology, making it more suitable for data transmission. And communication.
Main PLC carrier technology
At present, the domestic carrier communication is basically a narrow-band FSK carrier. This method is greatly affected by the load of the power line. The communication channel is easy to cause instability, and its propagation rate is not enough, which does not meet the requirements of real-time communication of smart meters, so many new The carrier communication improvement scheme came into being.
Such as the S-FSK and ASK modulation automatic switching technology used by ON Semiconductor, the n-PSK modulation technology adopted by STMicroelectronics, and the PLC-G3 solution of Maxim in the main push is based on OFDM modulation technology, and the Middle East and Europe are being deployed. The PRIME standard is also based on OFDM modulation technology. Major semiconductor manufacturers have corresponding chip solutions for each technology, such as Maxim's MAX2990, MAX2992, STMicroelectronics ST7580, etc., while Texas Instruments' C2000 platform uses DSP solutions, users only need to modify the software protocol. A variety of standard solutions such as FSK, G3, and PRIME have been realized, which has brought great convenience to the design. Interested friends can refer to the author's previous article "Smart Meter Solutions", I believe it will definitely give you some inspiration.
With the continuous development of smart grid, I believe that PLC carrier technology will certainly be more and more widely used, and with the continuous improvement and evolution of this technology, it will become more and more deep into our lives, changing Our way of life.
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