Method and apparatus for preventing overheating in an...

H - Electricity – 02 – H

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H02H 7/085 (2006.01) A47L 9/28 (2006.01) H02H 7/093 (2006.01)

Patent

CA 2576281

A control circuit for a motor includes a voltage regulator having a thermal shutdown apparatus that turns off the voltage regulator when the temperature of the control circuit rises above a pre-determined threshold level, wherein the voltage regulator is used to provide power to a plurality of insulated gate bipolar transistors controlling a plurality of stator windings of the motor. Thus the voltage regulator prevents the control circuit and the various components on the control circuit from being damaged from overheating. An embodiment of the control circuit is adapted to generate an error code in response to the shutdown of the voltage regulator and to monitor the operation of the motor to ensure that the motor has been turned off and then on before turning on the power supply to a plurality of phase windings.

La présente invention se rapporte à un circuit de commande pour moteur, comprenant un régulateur de tension pourvu d'un dispositif d'arrêt thermique qui arrête le régulateur de tension lorsque la température du circuit de commande dépasse un niveau seuil prédéterminé. Le régulateur de tension sert à alimenter une pluralité de transistors bipolaires à porte isolée commandant une pluralité d'enroulements de stator du moteur. Le régulateur de tension empêche ainsi la détérioration du circuit de commande et des divers composants du circuit de commande sous l'effet d'une surchauffe. Une des formes de réalisation de ce circuit de commande est conçue pour générer un code d'erreur en réponse à l'arrêt du régulateur de tension, et surveiller le fonctionnement du moteur afin de vérifier que ce dernier a bien été arrêté, puis a redémarré, avant d'activer l'alimentation d'une pluralité d'enroulements de phase.

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