Dimming interface using combination of analog and digital dimming

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12144077
APP PUB NO 20230123235A1
SERIAL NO

17490034

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An LED lighting system includes switching circuitry adjustably driving a string of LEDs and being controlled by a reference current and an enable signal. A controller generates the reference current and enable signal based upon a PWM signal such that the switching circuitry: sources a first LED current to the string of LEDs that is proportional to a duty cycle of the PWM signal when the duty cycle is greater than a threshold duty cycle to thereby perform analog dimming; and sources a second LED current to the string of LEDs that has a duty cycle proportional to the duty cycle of the PWM signal when the duty cycle of the PWM signal is less than the threshold duty cycle, such that an average LED current delivered to the string of LEDs is proportional to the duty cycle of the PWM signal to thereby perform digital dimming.

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Patent Owner(s)

Patent OwnerAddress
STMIROELECTRONICS S R LVIA C OLIVETTI 2 AGRATE BRIANZA (MB) 20864

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Adragna, Claudio Monza, IT 100 1428
Gritti, Giovanni Bergamo, IT 26 259

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