Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1998-05-04
1999-12-28
Sterrett, Jeffrey
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 37, 363 40, 363 65, H02M 544
Patent
active
060090022
ABSTRACT:
A method for operating a power electronic circuit having a first power convertor and at least one second power convertor is specified. The pulse duration-modulated driving of the switches of the circuit arrangement is effected according to a comparison of a reference oscillation with a carrier oscillation. According to the invention, a component of a third harmonic is admixed with the reference oscillation over virtually the entire drive-level range, in particular including low drive-level rates in the range from 20% to approximately 87%. It is also possible to admix a corresponding component of a ninth harmonic in the drive-level range from 20% to approximately 33%. This results in a low clock frequency for the first power convertor and the second power convertor need not have a feedback capability. (FIG. 1)
REFERENCES:
patent: 3648149 (1972-03-01), Brown et al.
patent: 5805437 (1998-09-01), Gruning
Asea Brown Boveri AG
Sterrett Jeffrey
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