Reduced rating T-connected autotransformer for converting...

Details Reduced rating T-connected autotransformer for converting... Reduced rating T-connected autotransformer for converting...

2008-05-20

2008-05-20

Berthane, Adolf (Department: 2838)

Electric power conversion systems

Phase conversion without intermediate conversion to d.c.

With automatic voltage magnitude or phase angle control

Reexamination Certificate

active

07375996

ABSTRACT:
The invention provides a T-connected autotransformer for converting three-phase ac input voltages to nine phase shifted ac voltages feeding three sets of three-phase diode rectifier bridges. The nine phase shifted voltages are at an angle of +20 degree or −20 degree with respect to the supply voltages and their magnitudes are essentially identical. The present design requires substantially fewer coils than other autotransformers for 18-pulse AC-DC converters, resulting in saving in space, volume, weight, size and cost of the converter. The magnetics requirement is only about 30% of the drive rating. The output voltage ratio can also be selected to give an average dc output from the proposed converter same as that of a conventional three-phase diode bridge rectifier. However, it is also possible to step up or step down the output voltage as required.

REFERENCES:
patent: 5343080 (1994-08-01), Kammeter
patent: 5619407 (1997-04-01), Hammond
patent: 6198647 (2001-03-01), Zhou et al.
patent: 6249443 (2001-06-01), Zhou et al.
patent: 6335872 (2002-01-01), Zhou et al.

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