INVERTER

PROBLEM TO BE SOLVED: To protect an inverter against breakdown caused by overcurrent exceeding the maximum rated current. SOLUTION: A current detector 5 detects the phase currents of an induction motor IM and determines the maximum values which are outputted to first through third comparators 7-9. T...

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Bibliographische Detailangaben
Hauptverfasser:	YUASA HIROAKI, OKAMURA YUKIHIKO, IZUMIMOTO TOMOAKI
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROL OR REGULATION THEREOF CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To protect an inverter against breakdown caused by overcurrent exceeding the maximum rated current. SOLUTION: A current detector 5 detects the phase currents of an induction motor IM and determines the maximum values which are outputted to first through third comparators 7-9. The first through third comparators 7-9 compare the maximum values with first through third set reference levels and output detection signals when the set reference levels are exceeded. The first comparator 7 delivers a detection signal to an inverter 1 which then turns a switching element off to interrupt the PWM operation. Consequently, the current flowing through the induction motor IM is reduced thus protecting the inverter against breakdown caused by overcurrent.