Signal processing unit for a pressure switch or the like

H - Electricity – 01 – H

Patent

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Details

H01H 35/26 (2006.01) G01L 9/04 (2006.01) G01L 19/12 (2006.01)

Patent

CA 2413869

Disclosed is a signal processing unit for a pressure switch or the like, comprising a sensor element, such as a strain gauge bridge (26-1, 26-2, 26-3, 26-4) to supply an analog electrical signal (28-1, 28-2) that corresponds to a pressure, a signal processing unit (32-1, 32-2, 38, 40) which is connected downstream of the sensor element to amplify and digitize the analog signal, and a control unit for electrical switches which is connected downstream of the signal processing unit to switch external loads or the like. According to the invention, the signal processing unit comprises a chopper amplifier (12), which switches or balances the polarity of the analog electrical signal present at its input (34) and supplied by the sensor element (26) and the amplified analog electrical or digitized signal present at its output at the same clock rate.

L'invention concerne une unité de traitement de signaux pour un manocontact ou un dispositif semblable, qui comprend un élément capteur, par exemple un pont à extensiomètre (26-1, 26-2, 26-3, 26-4) pour alimenter un signal électrique analogique (28-1, 28-2) qui correspond à une pression, une unité de traitement de signaux (32-1, 32-2, 38, 40) qui est branché en aval de l'élément capteur pour amplifier et numériser le signal analogique, et un module de commande de contacteurs électriques, qui est branché en aval de l'unité de traitement des signaux afin de commuter les consommateurs extérieurs ou autres dispositifs semblables. Selon l'invention, l'unité de traitement des signaux comprend un amplificateur à hacheur (12), qui commute ou équilibre la polarité du signal analogique présent à titre de signal d'entrée (34) et fourni par l'élément capteur (26) et le signal analogique amplifié ou le signal numérique présent en tant que signal de sortie, à la même fréquence d'horloge.

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