Method and apparatus for device-dependent calibration of...

H - Electricity – 01 – H

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H01H 47/00 (2006.01) G01R 31/327 (2006.01) H01H 45/00 (2006.01)

Patent

CA 2356002

A system and method are provided for ensuring increased accuracy of individual relays (e.g., within a control system comprising a sensor) to close substantially coincidentally with respect to a current zero-crossing of an incoming power supply waveform. To determine timing of contact operation, a microcontroller operates the contacts in response to one of a series of test pulses, and determines the amount of time required for contact operation. The difference between timing of contact operation and zero-crossing is determined and adjusted to offset errors incurred by microcontroller threshold variations and power supply voltage variations. The calibrated value is then provided to the sensor in order to extend sensor life.

La présente invention concerne un système et une méthode permettant d'assurer la précision de relais individuels (p. ex. dans un système de contrôle comportant un capteur) afin de se fermer essentiellement en coïncidence par rapport au passage à zéro d'une onde d'alimentation de courant. Pour déterminer la synchronisation d'activation de contacteurs, un microcontrôleur actionne les contacteurs en réponse à une impulsion d'essai parmi une série desdites impulsions, et détermine la période nécessaire à l'activation des contacteurs. La différence entre le calage d'activation des contacteurs et du passage à zéro est déterminée et ajustée afin de compenser des erreurs encourues par les variations de seuil du microcontrôleur, et les variations de la tension d'alimentation en courant. La valeur étalonnée est alors transmise au capteur afin de prolonger la vie utile de ce dernier.

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