Logic input circuit with energy transfer and adaptable in...

G - Physics – 05 – B

Patent

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Details

G05B 19/042 (2006.01) G01R 19/155 (2006.01) G01R 19/165 (2006.01) G05B 19/418 (2006.01)

Patent

CA 2350664

The invention concerns a logic input circuit for an industrial equipment automatic system powered by a direct current voltage source, in particular a battery (16), comprising a voltage amplifying energy converter (12) consisting of an inductance coil L and a switching transistor TR, connected to the input E1 of the circuit (10); a logic level sensor DL with optocoupler (20), and a clock circuit H controlling the transistor switching TR by adjusting the frequency or the cyclic ratio to be adapted in voltage to the signals applied at the input E1, and the overvoltage value generated in logic high (1) by the inductance coil L when the transistor TR is switched off-state.

Un circuit d'entrée logique pour un automatisme d'un équipement industriel alimenté par une source de tension continue, notamment une batterie (16), comporte: un convertisseur d'énergie (12) élévateur de tension composé d'une bobine d'inductance L et d'un transistor TR de commutation, connectés à l'entrée E1 du circuit (10); un détecteur de niveau logique DL à optocoupleur (20), et un circuit d'horloge H pilotant la commutation du transistor TR par réglage de la fréquence ou du rapport cyclique pour s'adapter en tension aux signaux appliqués à l'entrée E1, ainsi que la valeur de la surtension engendrée dans l'état logique haut (1) par la bobine d'inductance L lors de la commutation du transistor TR vers l'état bloqué.

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