Led forward voltage estimation in pulse oximeter

Details Led forward voltage estimation in pulse oximeter Led forward voltage estimation in pulse oximeter

A - Human Necessities

61

N

A61N 5/00 (2006.01) H05B 33/08 (2006.01)

Patent

CA 2556716

An apparatus and method for determining if a forward voltage of an LED in a pulse oximeter is within a predetermined range. This is accomplished by measuring the current through the LED, and also by knowing the duty cycle of the pulse width modulator (PWM) drive signal to the LED.

L'invention concerne un appareil et un procédé de détermination si la tension directe d'une DEL dans un sphygmo-oxymètre se trouve à l'intérieur d'une gamme prédéterminée. Ceci est exécuté par mesure du courant passant dans la DEL et également par connaissance du cycle de travail du signal d'attaque du modulateur d'impulsions en durée (PWM) envoyé à la DEL.

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