Dimmer

Details Dimmer Dimmer

1980-05-16

1982-03-23

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315127, 315208, 315224, 315225, 361111, H05B 3904

Patent

active

043215092

ABSTRACT:
A dimmer suitable for use to control the intensity of illumination of a lamp or lamps for illuminating an instrument panel provided in a compartment of a vehicle such as a motor car, comprises: a dimming transistor connected to a lamp or lamps to be dimmed for controlling an electric current supplied to said lamp or lamps, a switching circuit connected to said dimming transistor for generating pulses having a controllable duty ratio to cause said dimming transistor to turn `ON` on `OFF`, surge voltage sensing means for sensing a surge voltage applied to an electric source line, and transistor shutoff means for shutting off said dimming transistor in response to a signal from said surge voltage sensing means.

REFERENCES:
patent: 3253186 (1966-05-01), Rogers et al.
patent: 3793535 (1974-02-01), Chowdhuri
patent: 3858088 (1974-12-01), Scarpino et al.
patent: 3893043 (1975-07-01), Fukuoka
patent: 4134101 (1979-01-01), Jones, Jr.

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