Lighting system having photosensing timing switch circuit

Details Lighting system having photosensing timing switch circuit Lighting system having photosensing timing switch circuit

1982-08-10

1987-02-24

Moore, David K.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Electric switch controlled by the radiant energy responsive...

315129, 315360, H05B 3702

Patent

active

046459804

ABSTRACT:
A lighting system, which includes one or more lighting apparatus sets, includes a control circuit. The control circuit has an ambient light sensing component and processing circuitry which produce a control signal whenever the intensity of ambient light reaches a given level and remains at that level or less. A delay (debounce) circuit receives the control signal and provides an output which effects the transfer of power to the lighting apparatus set or sets and starts a timing circuit which is operatively arranged to assure continuing transfer of power to the set or sets for a given time interval, at the expiration of which power is removed from the set or sets. An alarm circuit also controlled by an output from the timing circuit may provide a warning alarm shortly before the expiration of the ON time interval. The control circuit may also turn OFF the power to the set or sets when ambient light of a set intensity becomes present.

REFERENCES:
patent: 3184637 (1965-05-01), Skinner
patent: 4281365 (1981-07-01), Elving et al.
patent: 4283661 (1981-08-01), Doty
patent: 4354120 (1982-10-01), Schornack
patent: 4362970 (1982-12-01), Grady
patent: 4388567 (1983-06-01), Yamazaki et al.
patent: 4451763 (1984-05-01), Sodini
B. E. Kerley, "Garden Path Lighting".
R. A. Penfold, "Dusk to Dawn Switch", Radio and Electronics Constructor, vol. 33, No. 10, Jun. 1980, Great Britain.

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