Electric lamp and discharge devices: systems – Regulation of the control current and/or potential applied...
Reexamination Certificate
2008-07-01
2008-07-01
Vu, David H. (Department: 2821)
Electric lamp and discharge devices: systems
Regulation of the control current and/or potential applied...
C315S199000, C315SDIG002
Reexamination Certificate
active
07394204
ABSTRACT:
A method and apparatus for detecting a zero crossing or desired phase angle of a power line signal having a variable amplitude uses a ratio between a peak amplitude of the power line signal and the amplitude of the power line signal at a desired phase angle for a known amplitude version of the power line signal to detect when a variable amplitude version of the power line signal is at the desired phase angle or zero crossing. The detection of the phase angle is used to determine if a notch is present in the power line signal. A substantially constant width pulse is generated if a notch is detected regardless of the amplitude of the power line voltage or current. The invention is particularly useful in a lighting system for generating and detecting pulses used to communicate information from a power line communication controller to a series of electronic ballasts over a power line used to power the ballasts. The information can be used to control a dimming function of the ballasts.
REFERENCES:
patent: 4348582 (1982-09-01), Budek
patent: 5821703 (1998-10-01), Callahan et al.
patent: 6111368 (2000-08-01), Luchaco
patent: 6844810 (2005-01-01), Cern
patent: 6924732 (2005-08-01), Yokoo
patent: 6933835 (2005-08-01), Kline
patent: 6965302 (2005-11-01), Mollenkopf et al.
patent: 6965303 (2005-11-01), Mollenkopf
patent: 6980091 (2005-12-01), White, II et al.
patent: 6987430 (2006-01-01), Wasaki et al.
patent: 6987444 (2006-01-01), Bub et al.
patent: 6998962 (2006-02-01), Cope et al.
patent: 6999505 (2006-02-01), Yokoo et al.
patent: 7023324 (2006-04-01), Kodama et al.
patent: 7030734 (2006-04-01), Butler et al.
patent: 7034225 (2006-04-01), Thompson et al.
patent: 7034663 (2006-04-01), Mansfield et al.
patent: 7042351 (2006-05-01), Kline
Dernovsek John Jay
Li Changsheng
Shet Deepak
Patterson Mark J.
Universal Lighting Technologies, Inc.
Vu David H.
Waddey & Patterson
LandOfFree
Zero crossing detection of line voltage/current of variable... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Zero crossing detection of line voltage/current of variable..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zero crossing detection of line voltage/current of variable... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2796171