Multiphase motor driving device

This invention provides a multiphase motor driving device capable of detecting ON failure of switching elements (Q2, Q4, Q6) on the lower side in an inverter circuit (3). The detection timing of the current flowing to a shunt resistor (Ru) of a U-phase is shifted from an OFF period to an ON period o...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	GUNJI, KEITA
Format:	Patent
Sprache:	eng ; fre ; ger
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 LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES MOTOR VEHICLES PERFORMING OPERATIONS PHYSICS TESTING TRAILERS TRANSPORTING
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Beschreibung
Zusammenfassung:	This invention provides a multiphase motor driving device capable of detecting ON failure of switching elements (Q2, Q4, Q6) on the lower side in an inverter circuit (3). The detection timing of the current flowing to a shunt resistor (Ru) of a U-phase is shifted from an OFF period to an ON period of a switching element Q1 on an upper side in the U-phase, and whether or not ON failure occurred in the switching element Q2 on the lower side is determined based on the current flowing to the shunt resistor (Ru) of the U-phase in the ON period. If the detection timing is simply shifted, the U-phase current that is necessary under normal circumstances may not be detected in the ON period of the switching element Q2 on the lower side, and thus the current value of the U-phase current is estimated based on the currents flowing to the shunt resistors (Rv, Rw) of the other two phases (V-phase, W-phase).