A power line communication method based on an IGBT
A technology of power line communication and comparison method, which is applied in the direction of distribution line transmission system, etc., can solve the problems of low information transmission efficiency and inability to adapt to information transmission requirements, and achieve the effect of increasing the speed.
Inactive Publication Date: 2019-05-28
BEIJING FEILIXIN INFORMATION SECURITY TECH CO LTD
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Problems solved by technology
At present, this communication method uses silicon controlled rectifier trigger, which can only implement low-frequency signal superposition in the descending stage of AC waveform, and only one bit of information can be superimposed in each cycle. Generally, the effective transmission information can only reach below 10bps. Long station area information or user information, coupled with check digits and redundant codes, the information transmission efficiency is very low, and it cannot meet the increasing information transmission requirements in the future
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[0019] The present invention will be further described below in conjunction with accompanying drawing.
[0020] The transmitter structure is as figure 2 , the data encoding circuit 10 processes the demand for sending data, and the control drive circuit 11 drives the IGBT switch 12 to superimpose a low-frequency waveform with a width of 0.5ms on the AC mains waveform every 0.5ms. Each low-frequency waveform represents 1bit information. In a half-wave cycle, 8 bits of information are sent. In order to ensure safety, a current-limiting overvoltage protection circuit 13 needs to be added to the IGBT switch 12 to protect the safe operation of the power supply system.
[0021] At the receiving end, before entering the digital circuit, the sampling circuit 21 samples the AC mains waveform, and the output signal enters the filter circuit 22 for filtering to remove interference other than the signal frequency, and then the sampled signal is conditioned by the signal conditioning circ...
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The invention discloses an IGBT-based power line communication method. A communication system is composed of a transmitting end and a receiving end. The transmitting end utilizes the switching characteristic of the IGBT element to superpose signals at different positions of an alternating current mains supply waveform, so that multi-bit information transmission in an alternating current period isrealized. And after the receiving end samples the alternating current waveform, the data decoding circuit is used for recovering the information in each period into the original information. Accordingto the method, the bit information capable of being transmitted in an alternating current period is increased by 8-8 times compared with bit information capable of being transmitted in a silicon controlled rectifier mode; And by 16 times, one byte or even more bit information can be transmitted in one alternating current waveform period.
Description
technical field [0001] The invention belongs to the technical field of communication, and in particular relates to the field of long-distance power line carrier communication. Background technique [0002] In the context of the increasing development of smart grids, the most basic function of the power sector is to implement refined management of users, and the physical topology of low-voltage lines is the primary task of the power management sector to implement refined management. The line sorting method depends on the appearance of the line and the construction line diagram. It is difficult to accurately identify the long-term power supply lines; the power-off combing method can accurately identify the relationship between the household meter and the transformer, but it will affect the user experience. , for users who cannot power off, this method cannot be used. The most convenient technology is to use the power line carrier communication method of superimposing low-freq...
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IPC IPC(8): H04B3/54
Inventor 不公告发明人
Owner BEIJING FEILIXIN INFORMATION SECURITY TECH CO LTD