Electronic circuit with capacitive switching ability

Details Electronic circuit with capacitive switching ability Electronic circuit with capacitive switching ability

H - Electricity

03

K

H03K 17/955 (2006.01)

Patent

CA 2619540

Electronic circuit for the detection of a capacitive variation on two distinct contact capacitors (C1, C2) and comprising means able of squaring the signals generated by a common pulse generator and filtered by two filters (R1, C1 - R2, C2), wherein the respective capacitors (C1, C2) are the same said contact capacitors which are connected to a respective terminal to a common ground (G); said means are also able to generate respective signals formed of trains of squared pulses, to compare said two signals and to provide an output signal depending on the result of said signals comparison. Said output signal depends on the phase difference between the pulses of said two trains of squared pulses.

L'invention porte sur un circuit électronique permettant la détection d'une variation capacitive sur deux condensateurs à contact distincts (C1, C2) et comprenant des moyens qui permettent la transformation en ondes carrées des signaux produits par un générateur d'impulsions commun et filtrés par deux filtres (R1, C1 - R2, C2), les condensateurs respectifs (C1, C2) étant les condensateurs à contact précités qui sont reliés à une borne respective et à une masse commune (G); lesdits moyens étant également capables de produire des signaux respectifs formés de trains d'impulsions carrées, afin de comparer les deux signaux précités et de fournir un signal de sortie en fonction du résultat de la comparaison des signaux. Le signal de sortie précité dépend de la différence de phase entre les impulsions des deux trains d'impulsions carrées.

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