Powerline pulse position modulated transmitter apparatus and...

Details Powerline pulse position modulated transmitter apparatus and... Powerline pulse position modulated transmitter apparatus and...

2007-09-04

2007-09-04

Wu, Daniel (Department: 2612)

Communications: electrical

Systems

Selsyn type

C340S315000, C340S315000

Reexamination Certificate

active

11112568

ABSTRACT:
A transmitting controller is connected to a powerline and on command places a reference signal and a series of signal pulses in the powerline at a series of signal timing positions related to zero voltage crossing points so that the signals pulses are substantially in the powerline temporal quiet zone near zero crossing. The signal pulses are produced from a pair of capacitors and switches which are each sequentially charged a first polarity from the powerline and is discharged in the powerline at the opposite polarity so that the powerline voltage at the time of the pulse is additive to the pulse voltage. The receiving controller is connected to the powerline and has a filter circuit therein which filters away the powerline AC signal and noise to leave the reference and signal pulses. The signal pulses are compared to the position of starting reference pulses to determine in which signal timing position the pulses have occurred.

REFERENCES:
patent: 3689888 (1972-09-01), Wootton
patent: 4328482 (1982-05-01), Belcher et al.
patent: 4963853 (1990-10-01), Mak
patent: 4996513 (1991-02-01), Mak et al.
patent: 5614811 (1997-03-01), Sagalovich et al.
patent: 5933072 (1999-08-01), Kelley
patent: 6496104 (2002-12-01), Kline
patent: 6784790 (2004-08-01), Lester

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