Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1990-10-11
1992-04-28
Wong, Peter S.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 37, 363 2, H02M 500
Patent
active
051093278
ABSTRACT:
An electronic system comprises a three-phase transformer, a power conversion circuit, and a control circuit. The three-phase transformer has primary windings and first, second and third secondary windings. The primary windings are connected to three-phase power supply and the first secondary winding is connected in phase with a single-phase load, such as an electric railway. The second and third secondary windings are connected to the single-phase load by the power conversion circuit. The power conversion circuit includes an a.c. to d.c. converter, a d.c. to a.c. converter, and a single-phase transformer. The d.c. to a.c. converter is adapted to convert out of phase power from the second and third windings, into a d.c. voltage signal. The d.c. to a.c. converter is connected to a.c. to d.c. converter and is adapted to convert the d.c. voltage signal into a single-phase a.c. voltage signal. The single-phase transformer has a primary winding which is connected to the d.c. to a.c. converter, and a second winding which is connected to the single-phase load. The control circuit is operably associated with the power conversion for controlling the a.c. to d.c. converter and the d.c. to a.c. converter, so that the single-phase load appears as a balanced three-phase load on the three-phase power supply.
REFERENCES:
patent: 3202896 (1965-08-01), Lewus
patent: 4638418 (1987-01-01), Alexander
patent: 4985819 (1991-01-01), Mori et al.
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