Automobile dashboard light control

Electricity: power supply or regulation systems – Input level responsive

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Details

323351, 323905, G05F 500

Patent

active

061077879

ABSTRACT:
Dashboard dimmer light circuit for a vehicle, for example a car or truck. A power supply 10 provides a step-function voltage signal to an op-amp oscillator circuit 20 which provides a triangular voltage oscillation signal to an op-amp level comparator 40 which, in turn, compares the triangular voltage oscillation signal to a voltage reference for providing a pulse-width-modulated (PWM) voltage signal to a power FET driver 70 which, in turn, responds to the pulse-width-modulated voltage signal by providing a current signal to an automobile dashboard dimmer light 80. Features of the invention include a) a dashboard dimmer light having a stable oscillator frequency, b) PWM duty cycle stability in a dashboard dimmer light, c) efficient accomplishment of the invention's oscillator and level comparator functions within a single IC, d) reduction of electromagnetic interference which might otherwise intefere with other electronic equipment in the dashboard.

REFERENCES:
patent: 4325021 (1982-04-01), McMackin
patent: 4772995 (1988-09-01), Gautherin et al.
patent: 5514947 (1996-05-01), Berg
patent: 5519598 (1996-05-01), Sakai et al.
patent: 5572112 (1996-11-01), Saeki et al.
patent: 5818207 (1998-10-01), Hwang
patent: 5847554 (1998-12-01), Wilcox
patent: 5949224 (1999-09-01), Barkaro

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