PWM CONTROLLING CIRCUIT AND LED DRIVER CIRCUIT HAVING THE SAME IN

PURPOSE: A PWM(Pulse Width Modulation) control circuit and an LED driving circuit using the same are provided to control the boosting of a driving voltage by determining the connecting condition of each LED array according to a feedback voltage. CONSTITUTION: A voltage detecting unit(110) is connect...

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Bibliographic Details
Main Authors KIM, JIN WOOK, LIM, CHANG SIK, RYU, BEOM SEON
Format Patent
LanguageEnglish
Korean
Published 28.08.2012
Subjects
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
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Summary:PURPOSE: A PWM(Pulse Width Modulation) control circuit and an LED driving circuit using the same are provided to control the boosting of a driving voltage by determining the connecting condition of each LED array according to a feedback voltage. CONSTITUTION: A voltage detecting unit(110) is connected to a plurality of LED arrays and detects the minimum voltage from feedback voltages of the LED arrays. A control unit(120) outputs a control signal for controlling the boosting operation of the LED arrays. A PWM signal generating unit(130) outputs a PWM signal corresponding to the control signal. A driving voltage generating unit supplies driving voltages to the LED arrays according to the PWM signal.
Bibliography:Application Number: KR20110014795