Title:
AC POWER LINE SIGNALLING SYSTEM
Document Type and Number:
WIPO Patent Application WO2001090828
Kind Code:
A3
Abstract:
A transmitter produces a control signal which preferably has no DC component (i.e. its average magnitude is 0). The control signal is synchronized with an AC power signal on the AC power line and is embedded into it by summation to produce a modified AC power signal. A transmitter with an active load dropping circuit to provide a precisely shaped control signal is provided and a wave form with a small magnitude during the highest power portion of the AC power signal is provided, reducing the power consumption of the signalling system. A receiver calculates the area under each positive half wave of the modified power signal and compares it to a threshold to distinguish between "0" and "1" bits. In another embodiment, the receiver incorporates an asymmetric low pass filter. The filtered signal is attenuated (at a selected magnitude) when a "1" (or "0") bit is received. The receiver detects the attenuation by measuring the time for which the filtered signal exceeds the selected magnitude.
Inventors:
BOGDAN ALEXEI (CA)
HOFFKNECHT MARC OLIVER (CA)
HOFFKNECHT MARC OLIVER (CA)
Application Number:
PCT/CA2001/000671
Publication Date:
April 04, 2002
Filing Date:
May 08, 2001
Export Citation:
Assignee:
LUMION CORP (CA)
BOGDAN ALEXEI (CA)
HOFFKNECHT MARC OLIVER (CA)
BOGDAN ALEXEI (CA)
HOFFKNECHT MARC OLIVER (CA)
International Classes:
G05B19/042; H04B3/54; (IPC1-7): H04B3/54
Foreign References:
| EP0645870A1 | 1995-03-29 | |||
| US4400688A | 1983-08-23 | |||
| US4329678A | 1982-05-11 | |||
| US4328482A | 1982-05-04 |
Other References:
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 05 30 June 1995 (1995-06-30)
PATENT ABSTRACTS OF JAPAN vol. 009, no. 169 (E - 328) 13 July 1985 (1985-07-13)
PATENT ABSTRACTS OF JAPAN vol. 009, no. 169 (E - 328) 13 July 1985 (1985-07-13)
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