Electricity: electrical systems and devices – Safety and protection of systems and devices – Arc suppression at switching point
Reexamination Certificate
2007-08-07
2007-08-07
Bruce, David (Department: 2112)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Arc suppression at switching point
C361S005000, C361S093100, C361S102000, C361S042000
Reexamination Certificate
active
11100363
ABSTRACT:
An arc fault detection circuit collects samples of sensed current, determines a peak current value from the samples for each line cycle, determines a hysteresis value for a compressor load as a function of differences between the peak current values, and generates a trip signal responsive to the sensed current and the hysteresis value. The circuit determines a difference value for each line cycle from the present peak current value less the previous peak current value, low pass filters the difference value to provide a low pass filtered value, determines a peak value from the low pass filtered value, determines that the absolute value of the low pass filtered value is less than a portion of the peak value and responsively saves the peak value, and determines the hysteresis value as a function of the saved peak value. An operating mechanism opens separable contacts responsive to the trip signal.
REFERENCES:
patent: 5224006 (1993-06-01), MacKenzie et al.
patent: 5691869 (1997-11-01), Engel et al.
patent: 5818237 (1998-10-01), Zuercher et al.
patent: 5839092 (1998-11-01), Erger et al.
patent: 5933305 (1999-08-01), Schmalz et al.
patent: 6246556 (2001-06-01), Haun et al.
patent: 6259996 (2001-07-01), Haun et al.
patent: 6477021 (2002-11-01), Haun et al.
patent: 6570392 (2003-05-01), Macbeth et al.
patent: 6577138 (2003-06-01), Zuercher et al.
patent: 6650516 (2003-11-01), Langford et al.
patent: 6653219 (2003-11-01), Fukuyama
patent: 7068480 (2006-06-01), Wong et al.
patent: 2003/0072113 (2003-04-01), Wong et al.
Microchip Technology Inc., “Save More Energy with PIC Microcontrollers featuring nanoWatt Technology”, www.microchip.com
anowatt, 2003, 2 pp.
IAEI News, “Five New Categories for AFCI Devices Under UL 1699”, 2003, p. 94.
Underwriters Laboratories, “Arc Fault Circuit Interrupters—UL 1699”, Dec. 2000, pp. 33, 34, 43-45.
Elms Robert T.
Parker Kevin L.
Brandt Michael
Bruce David
Eaton Corporation
Moran Martin J.
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