Configurable interrupter for circuit overcurrent conditions

Details Configurable interrupter for circuit overcurrent conditions Configurable interrupter for circuit overcurrent conditions

H - Electricity

02

H

H02H 5/00 (2006.01) H02H 6/00 (2006.01)

Patent

CA 2469522

Electrical power distribution circuits for motor vehicles incorporate a switching element for controlling the energization of the circuits. Current metering elements associated with each switching element indicate the current drawn by the respective electrical circuits. A microcontroller (48) is provided which provides an activation signal for the switching elements, often in accord with a pulse width modulated duty cycle. The microcontroller (48) implements a circuit protective algorithm which takes as inputs the indication of current drawn by a particular electrical circuit and the duty cycle. An equivalent D.C. current is estimated for determining a heat index for a hypothetical fuse suitable for protecting the circuit. When the heat index exceeds the rating for the fuse the fuse melts.

Selon l'invention, des circuits de distribution de courant électrique pour des véhicules à moteur comprennent un élément de commutation permettant de commander l'alimentation desdits circuits. Des éléments de dosage de courant associés à chaque élément de commutation indiquent la quantité de courant prélevé par les circuits électriques respectifs. Un microcontrôleur (48) permet d'obtenir un signal d'activation pour les éléments de commutation, souvent en accord avec un rapport cyclique à modulation de largeur d'impulsion. Ledit microcontrôleur (48) met en oeuvre un algorithme de protection de circuit qui prend comme entrées les indications de courant prélevé par un circuit électrique particulier et le rapport cyclique. Un courant continu équivalent est estimé, permettant de déterminer un indice de chaleur pour un hypothétique fusible apte à protéger le circuit. Lorsque l'indice de chaleur dépasse la limite du fusible, celui-ci fond.

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