Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1986-03-28
1987-12-22
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
324133, G08B 2100
Patent
active
047149167
ABSTRACT:
A detector for indicating loss of voltage on a monitored conductor includes first and second serially connected capacitors, and a rectifier circuit which derives operating power from the monitored conductor to charge the capacitors in the presence of voltage on the conductor. A forward-biased diode connected across the second capacitor limits the voltage developed across the second capacitor during charging to a relatively low level. Upon loss of voltage a portion of the charge in the first capacitor is transferred to the second capacitor, causing the voltage across the second capacitor to reverse polarity and progressively increase. This causes an enhanced field effect transistor connected across the capacitor to become conductive and discharge the first capacitor through a relay or other indicating device to provide a control effect indicative of voltage loss.
REFERENCES:
patent: 3328690 (1967-06-01), Lockie et al.
patent: 3524133 (1970-08-01), Arndt
patent: 3524178 (1970-08-01), Stratton
patent: 3577041 (1971-05-01), Kring
patent: 3991366 (1976-11-01), Schweitzer, Jr.
patent: 4152643 (1979-05-01), Schweitzer, Jr.
patent: 4234847 (1980-11-01), Schweitzer
patent: 4375617 (1983-03-01), Schweitzer, Jr.
patent: 4402033 (1983-08-01), Mayer
patent: 4424512 (1984-01-01), Schweitzer, Jr.
patent: 4550288 (1985-10-01), Schweitzer, Jr.
Radio and Electronics Constructor, vol. 28, No. 11, pp. 686-687, Jun. 1975; "Mains Failure Monitor" by N. R. Wilson.
Hofsass Jeffery A.
Rowland James L.
LandOfFree
Voltage loss detector does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Voltage loss detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Voltage loss detector will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-820600