Method for measuring phase currents in an inverter

PCT No. PCT/DK96/00030 Sec. 371 Date Oct. 14, 1997 Sec. 102(e) Date Oct. 14, 1997 PCT Filed Jan. 19, 1996 PCT Pub. No. WO96/23347 PCT Pub. Date Aug. 1, 1996The present invention relates to the measuring of phase currents in an inverter, where by pulse width modulation controlled semiconductor switch...

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Bibliographische Detailangaben
Hauptverfasser:	JENSEN, JOHNNY WAHL, JAEGER, JENS ULRIK, NIELSEN, SOEREN EJNAR, THOEGERSEN, PAUL BACH
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 THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES PHYSICS TESTING
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Beschreibung
Zusammenfassung:	PCT No. PCT/DK96/00030 Sec. 371 Date Oct. 14, 1997 Sec. 102(e) Date Oct. 14, 1997 PCT Filed Jan. 19, 1996 PCT Pub. No. WO96/23347 PCT Pub. Date Aug. 1, 1996The present invention relates to the measuring of phase currents in an inverter, where by pulse width modulation controlled semiconductor switches invert a direct voltage from an intermediate circuit into a three-phase alternating voltage. The phase currents are measured by measuring the intermediate circuit current when an active switch state creates an unambiguous relation between the intermediate circuit current and a phase current. Time shifts in the phase current measuring can be avoided by measuring the value id of the intermediate circuit current in two separate settings (+E,uns u+EE 1, +E,uns u+EE 1, +E,uns u+EE 6, +E,uns u+EE 6) of the same active switch state (+E,uns u+EE 1, +E,uns u+EE 6) in a modulation period (Tsw) and by creating a resulting means value of the measured values. The mean values can be related in time to the center of the modulation period, and the third phase current at the same time can be calculated, because the sum of the phase currents is equal to zero.