Nine-phase step-up/step-down autotransformer

Details Nine-phase step-up/step-down autotransformer Nine-phase step-up/step-down autotransformer

2007-09-25

2007-09-25

Mai, Anh (Department: 2832)

Inductor devices

With means to change coil length or connections

Plural coils

C363S154000, C363S152000, C363S148000, C336S005000

Reexamination Certificate

active

11436133

ABSTRACT:
An irregular polygon connection of a three-phase autotransformer using only five windings per phase provides a source of nine-phase power suitable for an 18-pulse AC to DC power converter. The windings are connected in a manner to limit the amount of third harmonic current circulating in them. When the autotransformer is used to power a nine-phase AC to DC converter its kVA rating is typically less than 50% of the DC load kW. An additional tap on one of the five windings allows a wide range of AC output voltages to be obtained. Voltages greater than, less than, or equal to the AC input voltage can be obtained. Other multi-phase outputs are feasible. Additional isolated windings can provide means for the invention to operate as an efficient double-wound transformer.

REFERENCES:
patent: 5148357 (1992-09-01), Paice
patent: 6249443 (2001-06-01), Zhou et al.
patent: 6335872 (2002-01-01), Zhou et al.
patent: 6861936 (2005-03-01), Kamath

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