DEAD TIME COMPENSATION CIRCUIT FOR INVERTER

PURPOSE:To correct a command voltage at a starting time in a short time, to detect an actual zero current more accurately and to perform the accurate detection irrespective of a frequency. CONSTITUTION:The polarity of a correction voltage at a starting time is determined on the basis of the directio...

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Bibliographische Detailangaben
Hauptverfasser:	YUASA HIROAKI, OKAMURA YUKIHIKO
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:	PURPOSE:To correct a command voltage at a starting time in a short time, to detect an actual zero current more accurately and to perform the accurate detection irrespective of a frequency. CONSTITUTION:The polarity of a correction voltage at a starting time is determined on the basis of the direction of rotation of an induction motor and command voltages of two phases. Thereby the polarity of the correction voltage at the starting time is determined in a short time. A detecting method of a zero current is varied in accordance with a change in the amplitude of a current flowing through a coil of the induction motor. Thereby a zero current not shifting from an actual zero current is detected without being affected by noise. A zero current detecting time is changed in accordance with a frequency. Thereby a shift of a detected zero current from the actual zero current is prevented for both of low and high frequencies.