Communication diode driver circuit

Details Communication diode driver circuit Communication diode driver circuit

H - Electricity

05

B

H05B 33/08 (2006.01)

Patent

CA 2576711

A Communication Diode Driver Circuit (CDDC,10) for selectively illuminating communication diodes (CDs,16) in response to incoming digital data pulses (12) with a LED drive current ILED (t) close to a nominal LED drive current IN therefor in a steady state operation of the CDDC. The CDDC includes a driver unit for driving the LED drive current ILED (t), and a closed loop feedback unit for continuously monitoring the LED drive current ILED (t) for providing a variable shift voltage SV (t). The driver unit includes a shift amplifier (22) for algebraically superimposing a pulsed analog data voltage ADV (t) corresponding to incoming digital data pulses, and the shift voltage SV (t).

L'invention concerne un circuit d'attaque de diode de communication (CDDC,10) permettant d'éclairer sélectivement des diodes de communication (CD,16) en réponse à des impulsions de données numériques entrantes (12) avec un courant d'attaque LED ILED (t) proche d'un courant d'attaque LED nominal IN dans un fonctionnement d'état permanent dudit circuit d'attaque de diode de communication (CDDC). Ce dernier comprend une unité d'attaque permettant d'activer le courant d'attaque LED ILED (t) et une unité d'asservissement en boucle fermée conçue pour surveiller en continu le courant d'attaque LED ILED (t) de manière à fournir un décalage de tension variable SV (t). L'unité d'attaque comprend un amplificateur de décalage (22) servant à superposer de manière algébrique une tension de données analogiques pulsées ADV (t) correspondant aux impulsions de données numériques entrantes, et la tension de décalage SV (t).

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