Dynamic protection circuit for a motor type load

H - Electricity – 02 – H

Patent

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H02H 7/085 (2006.01) E05F 15/16 (2006.01)

Patent

CA 2237642

An express down vehicle window lift motor drive system in which an overcurrent detection circuit (10) interprets the flow of electrical power to the lift motor when the motor current exceeds a threshold which is set dynamically as a function of motor in-rush or peak current. Motor current is measured as a small voltage drop across a current shunt. When the current level rises above the dynamically set threshold energization of the motor is halted.

La présente invention a pour objet un circuit de détection des surtensions (10) pour système de lève-vitre à moteur électrique à abaissement rapide; le système en question est utilisé pour interpréter la circulation du courant électrique parvenant au moteur de relevage lorsque le courant du moteur dépasse un seuil qui est consigné dynamiquement en fonction du courant de crête du moteur. Le courant du moteur se traduit sous forme de faible chute de tension dans un shunt d'ampèremètre. Lorsque le niveau de courant dépasse le seuil consigné dynamiquement, l'excitation du moteur est interrompue.

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