Variable frequency charge pump in capacitive level sensor

G - Physics – 01 – F

Patent

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Details

G01F 23/26 (2006.01)

Patent

CA 2627076

A method of determining a fluid or material level. The method comprises the steps of : providing, at a first frequency, a current operatively capable of changing a capacitor; charging at least first and second capacitive devices to a predetermined voltage using the provided current; measuring the amount of current respectively necessary to charge the first and second capacitive devices to the predetermined voltage; determining a liquid level based on the measured signals from charging the first and second capacitive devices; and varying the first frequency.

L'invention porte sur un procédé permettant de déterminer le niveau d'un fluide ou d'un matériau, comportant les étapes suivantes: fourniture à une première fréquence d'un courant pouvant charger un condensateur; charge d'au moins un premier et un deuxième dispositif capacitif à un niveau prédéterminé de tension à l'aide dudit courant; mesure de la quantité de courant respectivement nécessaire pour charger le premier et le deuxième dispositif capacitif à la tension prédéterminée; détermination du niveau d'un liquide à l'aide des signaux mesurés de charge du premier et du deuxième dispositif capacitif; et variation de la première fréquence.

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