Electric power conversion systems – Frequency conversion without intermediate conversion to d.c. – By semiconductor converter
Patent
1981-08-14
1982-09-28
Shoop, William M.
Electric power conversion systems
Frequency conversion without intermediate conversion to d.c.
By semiconductor converter
363165, H02M 5275
Patent
active
043521550
ABSTRACT:
When the input frequency is below a preselected value, an unrestricted frequency changer (UFC) is operated in the conventional manner by sequentially switching to more positive input phases while the fundamental component of the output waveform is positive going and to more negative input phases while it is negative going. Above the preselected input frequency, the UFC is operated in a complementary manner; that is, by switching to more negative input phases while the output waveform fundamental component is positive going and to more positive input phases when it is negative going. The switching instants occur in UFC operation when the reference waveform is equal in amplitude but opposite in slope to each waveform in a set of timing waveforms phase locked to the input waveforms. During complementary UFC operation, switching occurs when the reference waveform is not only equal in amplitude to the timing waveforms but also has a slope of the same sense.
REFERENCES:
patent: 3431483 (1969-03-01), Lafuze
patent: 3493838 (1970-02-01), Gyugyi et al.
patent: 4001670 (1977-01-01), Gyugyi et al.
patent: 4030022 (1977-06-01), Bird
patent: 4084223 (1978-04-01), Gross et al.
Gyugyi et al, "Static Power Frequency Changers", John Wiley & Sons, 1976, pp. 384-395.
Shoop William M.
Telfer G. H.
Westinghouse Electric Corp.
Wong Peter S.
LandOfFree
Variable speed constant frequency power converter with two modes does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Variable speed constant frequency power converter with two modes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable speed constant frequency power converter with two modes will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-402359