Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1991-09-17
1993-04-27
Stephan, Steven L.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 98, 318811, H02M 7537
Patent
active
052068021
ABSTRACT:
The invention is used in a voltage conversion bridge for use in converting an AC voltage to a DC voltage or inverting a DC voltage into an AC voltage. In a three-phase bridge having one of three reference phase voltages U.sub.A or U.sub.B or U.sub.C associated with each leg, one of the switches S1, S2 or S3 (or alternatively their complements S1*, S2* or S3*) conducts in the time intervals where the associated voltage U.sub.A, U.sub.B or U.sub.C has a higher (or alternatively, smaller) amplitude than the other two reference voltages, and during these times the blanking interval compensation loss is compensated. According to the invention, (a) a three reference voltages are supplied; (b) the maximum of these voltages is detected; (c) the maximum is subtracted f the peak value of a triangle wave used for forming difference; (d) the difference is added to each of reference voltages to form a three first augmented reference voltages to a blanking interval loss compensator; (e) if the voltage conversion bridge is not saturated and adding a blanking interval deviation voltage compensation signal would not cause saturation, a blanking interval voltage deviation compensation signal is added to the first augmented reference voltages to compensate for voltage deviation caused by a blanking interval, thereby providing second augmented reference signals; and (f) the compensated signals are supplied to the PWM section, which in turn supplies PWM signals to a three-phase bridge. This method minimizes voltage deviations caused by the use of a blanking interval.
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"Power Electronics Converters, Applications, and Design" John Wiley & Sons, New York, 1989, pp. 141-144.
Baggot Breffni X.
Davidson Ben M.
Otis Elevator Company
Stephan Steven L.
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