Calling system based on flexible alternating current signal technology and communication method for calling system
An AC signal and call system technology, applied in the field of communication, can solve the problems of large signal attenuation, complex load situation, communication difficulties, etc., and achieve the effect of reducing interference and strong reliability
Inactive Publication Date: 2012-06-13
CHONGQING UNIV
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Problems solved by technology
However, because the low-voltage distribution network is directly oriented to users, this inherent feature makes the communication environment extremely harsh, such as: complex load conditions, strong and time-varying noise interference, large signal attenuation, small channel capacity, etc.
Therefore, it is quite difficult to realize high-performance low-voltage power line carrier communication
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[0032] The present invention will be further described below in conjunction with drawings and embodiments.
[0033] The call system is realized by using a flexible AC signal technology, and its core idea is to use the distortion of the grid voltage waveform to carry information. The low-voltage distribution line is used as the carrier of the communication signal. By controlling the conduction of the thyristor at the end signal sending device, the signal is superimposed on the fundamental voltage near the voltage zero crossing point, and the signal contained in the voltage waveform is detected by the first-end signal receiving device. Identify and locate the signal source based on the identification, so as to realize the end-to-end call function.
[0034] Such as figure 1 As shown, the specific implementation scheme of the flexible AC signal technology refers to short-circuiting the power supply in a short period of time before the voltage zero crossing by controlling the on-o...
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The invention discloses a calling system based on a flexible alternating current signal technology. The system comprises a power line, a tail end signal transmission device and a head end signal receiving device, wherein the tail end signal transmission device and the head end signal receiving device are arranged on and connected to the power line through sockets. A communication method based on a flexible alternating current signal comprises the following steps that: 1) a transmitter detects whether the line bears information or not; 2) the transmitter loads the information onto a voltage waveform; 3) a receiver detects whether the line carries the information or not; and 4) the receiver interprets the information, and gives a response. Compared with a special communication line, the power line is not required to be rewired, and is suitable for alteration. Compared with the conventional calling system and the conventional power carrier calling system, the calling system is simple and easy, and simultaneously can maximally reduce the interference of background noise over a calling signal. Compared with wireless communication, the invention has high reliability, and can avoid the interference over other equipment.
Description
technical field [0001] The invention relates to the communication field, in particular to a communication device and method for a power line power frequency voltage waveform. Background technique [0002] With the continuous development of social economy, the service industry as the tertiary industry is vigorously rising. In order to ensure good service quality and achieve high service efficiency, call systems are used in many service industries, such as hospitals, restaurants and KTV and other service places. Therefore, the existence and quality of the call system will have a great impact on people's quality of life, and sometimes even endanger people's lives. A good call system has extensive social significance and great practical value. [0003] The traditional call system generally adopts dedicated line transmission mode, but because of its cumbersome wiring installation and inconvenient maintenance, its cost performance is very low. [0004] Due to the various limitat...
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IPC IPC(8): H04B3/54
Inventor 雍静牛亮亮周程里王晓静吴元洪杨本强刘强杨岳
Owner CHONGQING UNIV