Coil impedance detection method and object detection method...

G - Physics – 01 – V

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G01V 3/10 (2006.01) G01R 27/16 (2006.01)

Patent

CA 2434318

A triangular wave generating circuit (21) generates a sweep voltage of a triangular wave, a VCO (22) generates a sweep of a frequency according to the sweep voltage, and a driving coil (4) is driven by the sweep voltage. From the current flowing through the driving coil (4), an interference component is extracted and rectified by a rectifier circuit (27). A peak hold circuit (28) holds a peak value of an interference voltage within a period corresponding to one sweep. The peak value thus held is compared by a comparator circuit (29) with a predetermined value and accordingly, a relay circuit (30) outputs a signal indicative of whether an object is present or not.

Selon cette invention, un circuit générateur d'ondes triangulaires (21) génère une tension de balayage d'une onde triangulaire et un oscillateur commandé par tension (VCO) (22) module la fréquence en fonction de la tension de balayage. Une bobine d'excitation (4) est excitée par la tension de balayage, extrait une composante d'interférence et rectifie cette dernière dans un circuit de rectification (27) en fonction du courant passant dans la bobine d'excitation (4). Un circuit de maintien de crête (28) maintient une valeur de crête de tension d'interférence dans un temps de balayage, et compare la valeur de crête maintenue à une valeur prédéterminée par un circuit de comparaison (29), émettant ainsi à partir d'un circuit de relais (30) un signal indiquant si un objet est présent ou non.

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