Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1991-09-06
1992-10-06
Voeltz, Emanual T.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 98, 318811, H02M 7537
Patent
active
051538210
ABSTRACT:
A voltage conversion device, whether for inversion, or conversion includes a pulse-width-modulator and a three-phase bridge, each leg of the bridge has a pair of complementary switches (S1/S1*, S2/S2*, S3/S3*). One of the switches S1, S2 or S3 (S1*, S2* or S3*) conducts in those time intervals where the associated reference voltage U.sub.A U.sub.B or U.sub.C has a higher (smaller) amplitude than the other two reference voltages. According to the present invention, (a) three reference voltages are supplied, (b) the maximum of these voltages is detected, (c) the maximum is subtracted from the peak value of a triangle wave used for forming the PWM signal, and (d) the difference is added to each of the reference voltages to form augmented reference voltages supplying a PWM. The result is that when one of the three reference voltages is greater than the other two, a switch of one of the three complementary pairs of such switches in the bridge conducts, while in each of the other two complementary pairs, both switches open and close in response to the PWM signal such that only two currents are independently controlled by each of the two complementary pairs which are allowed to open and close, and the third current, associated with the complementing pair which is not allowed to switch, is controlled by the other two.
REFERENCES:
patent: 4364109 (1982-12-01), Okado et al.
patent: 4951187 (1990-08-01), Stemmler
patent: 4994951 (1991-02-01), Iwasa et al.
Baggot Breffni X.
Otis Elevator Company
Voeltz Emanual T.
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