Circuit for controlling an indicator light to turn off slowly

Details Circuit for controlling an indicator light to turn off slowly Circuit for controlling an indicator light to turn off slowly

1995-07-17

1997-07-01

Pascal, Robert

Electric lamp and discharge devices: systems

With automatic shunt and/or cutout

Plural shunts and/or cut-outs

3151693, 315360, 315136, 315227R, H05B 3702

Patent

active

056441940

ABSTRACT:
A circuit for turning off an indicator light operates in two phases that provide a first rapid discharge phase and a second slow discharge phase. This sequence dims the light in a visual approximation of the exponential dimming that occurs with lights that operate with power supplies that have capacitors that give a slow turn off. The preferred light is an electroluminescent element that will be called a glow-effect capacitor which stores sufficient charge for slow turn off. When a switch associated with the light is opened, an FET turns on to discharge the capacitor rapidly to a selected voltage. This FET is then turned off and other components discharge the capacitor slowly. The switching signal for this FET is formed as a logic function of the switch position (open or closed) and the occurrence of the selected voltage level on the glow-effect capacitor.

REFERENCES:
patent: 4486691 (1984-12-01), Beggs
patent: 4646079 (1987-02-01), Kitai et al.
patent: 4924109 (1990-05-01), Weber

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