Duty cycle brightness control for lighting device
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United States of America Patent
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Jul 18, 2017
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app pub date -
Mar 24, 2016
filing date -
Mar 25, 2015
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Abstract
A brightness control circuit for a DC-powered LED light uses a PWM generator. The LED brightness is a function of the duty cycle of a drive signal to a transistor connected in series with the LED. In several embodiments the duty cycle signal generated by the PWM is controlled by at least one momentary SPST switch, or, in one alternative, by first and second SPST switches operable in a make-before-break sequence in a voltage divider circuit.
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