Lamp dimmer

Details Lamp dimmer Lamp dimmer

1983-02-07

1984-11-13

Dixon, Harold

Electric lamp and discharge devices: systems

Regulation of the control current and/or potential applied...

315287, 315291, 315311, 315297, G05F 100

Patent

active

044828446

ABSTRACT:
A lamp dimmer suited for fluorescent and other lamps which controllably notches the applied voltage to a lamp circuit each half cycle. Progressively larger dimming control voltages produces progressively wider notches as well as progressively causing the notches to be further from the zero-crossing occurrence toward the peak occurrence of the half cycles, thereby providing means for varying power to the light circuit. Optocoupler means is employed with respect to a power output bridge to isolate the control circuit from the power output circuit to the lamp. A photosensor used to sense the ambient light conditions is used to produce the dimming control voltage so as to achieve a balancing effect between the ambient and the artificial light produced by the lamp.

REFERENCES:
patent: 3265907 (1966-08-01), Kurata et al.
patent: 3265930 (1966-08-01), Powell
patent: 4087702 (1978-05-01), Kirby
patent: 4114071 (1978-09-01), Thrower et al.
patent: 4189664 (1980-02-01), Hirschfeld
patent: 4350935 (1982-09-01), Spira et al.
patent: 4371812 (1983-02-01), Widmayer
patent: 4395660 (1983-07-01), Waszkiewicz

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