Temperature protection circuit for light-emitting diodes

Temperature protection circuit for light-emitting diodes

Techniques are disclosed for regulating the temperature of a plurality of light-emitting diodes (LEDs) by monitoring the voltage drop across the LEDs. In one example, a driver circuit supplies a constant driver current to the LEDs. A temperature regulation circuit monitors the voltage drop across th...

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Hauptverfasser: Galvano Maurizio, Pamato Marco
Format: Patent
Sprache:eng
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ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
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creator Galvano Maurizio
Pamato Marco
description Techniques are disclosed for regulating the temperature of a plurality of light-emitting diodes (LEDs) by monitoring the voltage drop across the LEDs. In one example, a driver circuit supplies a constant driver current to the LEDs. A temperature regulation circuit monitors the voltage drop across the LEDs to determine whether the junction temperature of the LEDs exceeds a maximum operating temperature. If the junction temperature of the LEDs exceeds the maximum operating temperature, the temperature regulation circuit uses digital pulse-width modulation (DPWM) to decrease a digital duty cycle of the driver current supplied to the LEDs.
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subjects ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
title Temperature protection circuit for light-emitting diodes
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