Anti-flicker circuit for automatic turn-on of nightlight

Details Anti-flicker circuit for automatic turn-on of nightlight Anti-flicker circuit for automatic turn-on of nightlight

1983-08-12

1986-05-13

Moore, David K.

Electric lamp and discharge devices: systems

With radiant energy sensitive control means

Plural radiant energy responsive devices

315156, 315159, H05B 3702

Patent

active

045889260

ABSTRACT:
A second photoelectric element or cell (P2) is mounted in series with a first photoelectric element or cell (P1) of the prior art and in parallel with a portion of a voltage divider of which said first element is a part to shunt out a portion of the divider in response to light from a light load turned on by the operation of said first element incident to an increase in impedance thereof due to ambient darkness. Addition of the second photoelectric cell results in hysteresis of the turn-on/turn-off operating points of the first cell to prevent flicker to the light which is present at or near dusk in lights controlled by the prior art circuits. Mechanically, one cell (P1) is mounted on the side of a collar (21) surrounding the neck of a light bulb (13) outside direct light rays from the filament (23) while cell (P2) is mounted on the collar top in the direct path of light rays from the filament.

REFERENCES:
patent: 3450939 (1969-06-01), Misencik
patent: 4207501 (1980-06-01), Smallegan

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