Electricity: power supply or regulation systems – Input level responsive
Patent
1998-10-29
2000-08-22
Sterrett, Jeffrey
Electricity: power supply or regulation systems
Input level responsive
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.
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Evans Steven M.
Methode Electronics Inc.
Newman David L.
Sterrett Jeffrey
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