Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1994-07-07
1996-07-09
Mullen, Thomas
Communications: electrical
Condition responsive indicating system
Specific condition
307117, 340567, G08B 1300
Patent
active
055348505
ABSTRACT:
An electrical circuit for use in occupancy detectors for preventing false triggering when a load such as a light is de-energized. The occupancy detector includes circuitry for providing an intermediate signal indicating detection of a target object. An output stage receives the intermediate signal and in response provides a trigger signal for energizing the light or other load. An RC network, having a characteristic charge decay time, is coupled to the output stage such that the characteristic charge decay time governs the duration for which the output stage asserts the trigger signal for energizing the light or other load. Output signals from the occupancy-detecting circuitry are applied to the RC network through a first transistor switch. A second RC network, having its own characteristic charge decay time, is provided and the trigger signal is applied to charge the second RC network. When the output stage deasserts the trigger signal (thereby de-energizing the light or other load), the second RC network is discharged through a second transistor switch so as to bias the second transistor switch to its conducting state. The second transistor switch is connected to cut off the first transistor switch for the duration of the second RC network's characteristic charge decay time. During this period the first RC network is blocked from receiving the output of the occupancy-detecting circuitry, which is diverted instead over a bypass path through the second transistor switch.
REFERENCES:
patent: 4344071 (1982-08-01), Allen
Aronson Elliot B.
Lee Larry C. Y.
Mullen Thomas
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