Communication method utilizing power line
A communication method and power line technology, applied in distribution line transmission system, signal transmission/reception through power distribution, transmission/reception of signals by modifying power waves, etc., can solve problems such as power lines cannot be used
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Embodiment 1
[0034] A communication system to which the communication method of the present invention is applicable will be outlined below while referring to FIG. 1 . The communication system adopted in the present invention, for example, as shown in FIG. 1 , includes a plurality of (only 2 are shown in FIG. 1 ) first devices (sub-units) 10, and the plurality of first devices (sub-units) 10 is connected to a secondary power line L that is introduced into a building, an ordinary house, or a factory, etc., and supplies commercial power; a host 20, the host 20 is connected to these sub-units 10 through the secondary power line L, and monitors and manages these sub-units 10. Receive commercial AC power through the secondary power line L of the switchboard 30 . In FIG. 1 , the host 20 is installed downstream of the switchboard 30 , but the host 20 may be connected to a secondary power line (incoming line from a utility pole) (not shown) upstream of the switchboard 30 .
[0035] In the communic...
Embodiment 2
[0044] FIG. 4 shows AC waveforms including processed waveforms transmitted from the slave 10 to the master 20 in this embodiment. That is, as shown in FIG. 4, a current value that is higher than the peak value A of the reference waveform by a predetermined allowable load amount (for example, a current value) ΔI is preset as the allowable value B, and the value is stored in the host computer. In the common memory 25 of 20, the load signal is supplied from the slave unit 10 to the secondary power line, and the peak value C of the processed waveform formed by processing a part of the reference waveform based on the load signal is shown in the figure. When the host computer 20 judges that it is between the peak value A and the allowable value B, it is a correct load amount, and the host computer 20 judges that the peak value D exceeding the allowable value B is an incorrect and abnormal load amount. Then, the host machine 20 can judge whether or not the load amount is correct base...
Embodiment 3
[0046] FIG. 5 shows AC waveforms including processed waveforms transmitted from the slave 10 to the master 20 in this embodiment. In this embodiment, as shown in the figure, the magnitude of the loads is set across multiple stages, and for the degree of the corresponding loads, inherent information is provided, and the negative signs corresponding to these loads are signaled The secondary power line is supplied at a time corresponding to the power frequency. By this load signal, the amplitude of the reference waveform is partially increased, and the heightened part (processing waveform) is divided into multiple sections (three sections in the embodiment) according to the high and low values of the height, and in the corresponding height, there is a characteristic Information. That is, as shown in FIG. 5, the peak value of the reference waveform is defined as a signal "0", the first level L1 higher than the peak value is defined as a signal "1", and the higher second and thi...
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