Alternating-current power grid communication control system

Abstract

The invention relates to an alternating-current power grid communication control system which comprises a modulation switch connected to an alternating-current input power supply, an AC / DC conversion module, a signal detection module and a signal demodulation module, wherein the AC / DC conversion module, the signal detection module and the signal demodulation module are arranged at the side of an electric appliance; the modulation switch is switched among an opening state, a closing state and a modulating state; the modulation switch comprises an MCU (Microprogrammed Control Unit) module used for generating an accurate control signal to control the modulation switch to be switched between the opening state and the modulating state; the AC / DC conversion module is used for receiving alternating current under the control of the modulation switch and converting the received alternating current into a rectification signal; the signal detection module is used for receiving and generating a detection signal based on the rectification signal; and the signal demodulation module is used for receiving and demodulating the detection signal so as to generate a communication signal used for communicating between the modulation switch and the electrical appliance. By implementing the invention, 50 or 60Hz sine waves of a power line in the alternating-current power grid can be utilized for transmitting data, and the signal modulating and demodulating method is simple and has lower cost.

Description

technical field [0001] The present invention relates to a communication system, more specifically, to an AC grid communication control system. Background technique [0002] In some applications of the AC power grid, it is necessary to control the terminal electrical appliances connected to the power line, such as dimming of lamps, switching of electrical appliances, and so on. Existing communication methods usually modulate data from baseband to high frequency band and transmit it in the form of high frequency carrier wave on the power line in the AC grid. Modulation methods include FSK (Frequency Shift Keying) and OFDM (Orthogonal Frequency Division Multiplexing), etc., and its communication rate is also divided into low, high, and broadband. Table 1 lists the application classification of the carrier communication on the power line of the prior art: [0003] [0004] Table 1 [0005] In the prior art, commonly used terminal electrical control methods generally focus ...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the modulation process of the communication method in the prior art is often complicated, the cost is high, and it is not suitable for small data communication on the power line. Or 60Hz sine wave to achieve the purpose of data transmission AC grid communication control system

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