Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1992-09-22
1994-05-03
Skudy, R.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
363 78, 363 17, 363132, H02M 744
Patent
active
053093496
ABSTRACT:
A current detection method for a direct-current (DC) to three-phase alternating-current (AC) converter can utilize only a single DC sensor to detect and calculate the three-phase alternating currents. The method can detect a direct current value of one phase at each of six different gate states of three pairs of transistors in the DC to three-phase AC converter by means of the DC sensor. In the two-level pulsewidth modulation control, the control signal includes a plurality of carrier periods each being subdivided into three intervals. The three pairs of transistors are switched to the zero state in one interval of each carrier period, and to two different gate states respectively in the two other intervals. The method can detect two current values of different phases respectively in the two other intervals of each carrier period, and then calculate the current value of the other phase in accordance with the principle that the sum of the three-phase currents is always equal to zero.
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Davidson Ben
Industrial Technology Research Institute
Skudy R.
LandOfFree
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