Vehicle instrument panel lamps, improved pulse width dimmer syst

Details Vehicle instrument panel lamps, improved pulse width dimmer syst Vehicle instrument panel lamps, improved pulse width dimmer syst

1992-06-08

1993-12-07

Pascal, Robert J.

Electric lamp and discharge devices: systems

Special application

Vehicle

315209R, 315210, 315224, 315307, B60Q 126

Patent

active

052686167

ABSTRACT:
A pulse width dimming system responsive to low frequency pulse width modulated signals of various duty cycles employs a single charging capacitor in a charge pump circuit connected between a voltage source and the output of an FET for developing voltage pulse signals for controlling current through a field effect transistor used to control the intensity of lamps in a vehicle instrument panel.

REFERENCES:
patent: 4368406 (1983-01-01), Kruzich et al.
patent: 5001398 (1991-03-01), Dunn
patent: 5113120 (1992-05-01), Scott et al.

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