Load-control circuit for a mains-powered asynchronous...

Details Load-control circuit for a mains-powered asynchronous... Load-control circuit for a mains-powered asynchronous...

H - Electricity

02

P

H02P 25/04 (2006.01) H02P 7/622 (1995.01)

Patent

CA 2088626

Disclosed is a circuit for controlling the load of an asynchronous motor (11), the circuit comprising two capacitors (19, 20), one of which (20) can be connected, by means of a switch (70), in parallel with the other (19). Control is provided by a current sensor (30) and a voltage sensor (40), whose signals (S1, S2) are compared by a comparator (25). Depending on the relative size of the signals (S1, S2) a switch control unit (60) with relaxation hysteresis characteristics switches the switch (70) on or off. The circuit is simple, operates independently of the mains voltage (U) being used and its switch point can be adjusted by means of the current sensor (30).

Circuit de commande de la charge d'un moteur asynchrone (11) comportant deux condensateurs (19, 20), dont un (20) peut être connecté en parallèle avec l'autre (19), au moyen d'un interrupteur (70). La commande provient d'un détecteur de courant (30) et d'un détecteur de tension (40) dont les signaux (S1, S2) sont comparés par un comparateur (25). Selon l'importance relative des signaux (S1, S2), un dispositif de commande de l'interrupteur (60) comprenant des caractéristiques d'hystérésis à relaxation ouvre ou ferme l'interrupteur (70). Le circuit est simple, fonctionne indépendamment de la tension du secteur (U) utilisée, et son point de commutation peut être réglé au moyen du détecteur de courant (30).

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