Very low duty cycle pulse width modulator

H - Electricity – 03 – K

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Details

H03K 7/08 (2006.01) G09G 3/34 (2006.01)

Patent

CA 2272276

An apparatus which outputs very low duty cycle pulses of a consistent width. It is common to use a pulse width modulator as part of a liquid crystal display dimming system to vary the brightness. In the typical pulse width modulating scheme for lamp dimming, certain noise irregularities may appear at the beginning of a camping voltage. These irregularities result in pulse widths which vary greatly. In the present invention, the slope of the camping voltage is greatly increased at the beginning of the period, thus making the comparison between the reference voltage and the camping voltage more accurate.

L'invention concerne un appareil produisant des impulsions de largeur constante à très faible rapport cyclique. D'habitude, on utilise un modulateur de largeur d'impulsion faisant partie du système de gradation d'un dispositif d'affichage à cristaux liquides, pour varier la luminosité. Dans le mécanisme type de modulation de largeur d'impulsion destiné au réglage d'intensité d'une lampe, quelques irrégularités de bruit peuvent se produire au début d'une tension en dent de scie. Ces irrégularités provoquent des largeurs d'impulsion présentant une grande variation. Dans la présente invention, la pente de la tension en dent de scie est considérablement accrue au début de la période, ce qui permet d'effectuer une comparaison plus précise entre la tension de référence et la tension en dent de scie.

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