Communications: electrical – Systems – Selsyn type
Patent
1992-11-02
1993-11-23
Crosland, Donnie L.
Communications: electrical
Systems
Selsyn type
340310R, H04B 300, H04L 2700
Patent
active
052648230
ABSTRACT:
Data is transmitted on a power line as a momentary interruption of the power at or near the zero crossing of the current. The interruption is preferably a small fraction of the period of the frequency of the power line. The data is transmitted only to those devices in series circuit with the transmitter. The transmitter combines 60 Hz and 120 Hz clock signals with data from a shift register to interrupt current in a predetermined pattern, in which an interruption of both the positive going and negative going zero crossings define a logic "1" and the absence of interruptions is a logic "0." A data prefix identifies succeeding bits as data. The receiver produces a pulse width modulated signal in response to the data.
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patent: 4300126 (1981-11-01), Gajjar
patent: 4348582 (1982-09-01), Budek
patent: 4400688 (1983-08-01), Johnston et al.
patent: 4408185 (1983-10-01), Rasmussen
patent: 4914418 (1990-04-01), Mak et al.
patent: 5005187 (1991-04-01), Thompson
Crosland Donnie L.
Motorola Lighting, Inc.
Wood J. Ray
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