LIGHT-EMITTING DIODE DRIVING CIRCUIT CAPABLE OF CONTROLLING THE CURRENT OF A CONSTANT LIGHT-EMITTING DIODE

The present invention relates to a light-emitting diode driving circuit, comprising: a switching element, which supplies input power to a light-emitting diode or cuts off the supply of power to the light-emitting diode; a first sensing element, which is connected to the light-emitting diode and whic...

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Bibliographic Details
Main Author PARK, SHIHONG
Format Patent
LanguageEnglish
French
Published 24.02.2011
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Summary:The present invention relates to a light-emitting diode driving circuit, comprising: a switching element, which supplies input power to a light-emitting diode or cuts off the supply of power to the light-emitting diode; a first sensing element, which is connected to the light-emitting diode and which generates a feedback voltage corresponding to the current flowing through the light-emitting diode; a controller, the reference voltage of which is identical to the reference voltage of the first sensing element, and which controls the on/off operation of the switching element on the basis of the feedback voltage; and a first inductor and a diode, which are connected to the light-emitting diode and which provide the light-emitting diode with the current induced during the "on" operation of the switching element when the switching element is turned off. L'invention concerne un circuit de commande de diode électroluminescente comprenant un élément de commutation qui fournit un courant d'entrée à une diode électroluminescente ou coupe l'alimentation en courant vers la diode électroluminescente, un premier élément de détection qui est relié à la diode électroluminescente et qui génère une tension de rétro-action correspondant au courant traversant la diode électroluminescente, une unité de commande dont la tension de référence est identique à la tension de référence du premier élément de détection et qui commande l'activation et la désactivation de l'élément de commutation sur la base de la tension de rétro-action, ainsi qu'une première inductance et une diode qui sont reliées à la diode électroluminescente et qui, lorsque l'élément de commutation est désactivé, fournissent à la diode électroluminescente le courant induit lors de l'activation de l'élément de commutation.
Bibliography:Application Number: WO2010KR05426