Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1980-10-20
1982-12-07
Shoop, William M.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
318801, 318807, H02M 7515
Patent
active
043630898
ABSTRACT:
A self-commutating inverter supplies controllable frequency power to a load. The load, which may be a simple induction motor or the like, has plural load windings which may be arranged in two groups so that a load winding in one group has a complementary load winding in another. Thyristors are associated with each of the complemented load windings and the thyristors of each group of load windings are capacitively coupled. A DC potential is applied to the inverter by a pair of terminals. As different thyristors are enabled, current is commutated from one load winding to another. Excessive voltages induced by commutating the inductive loads are reduced by unidirectionally conducting devices coupled between a terminal and a divided load winding. For producing three phase power of controlled frequency, the load has six windings, forming two groups of three windings each. The thyristors associated with each group of windings conduct periodically in a sequence, with each thyristor conducting for one third (or 120.degree.) of the period. While the conduction periods for each of the groups of load windings are equal, they are offset in time by one-sixth (or 60.degree.) of the period.
REFERENCES:
patent: 3701939 (1972-10-01), Petersen et al.
patent: 3769555 (1973-10-01), Dolbachian et al.
patent: 4143308 (1979-03-01), Deplante et al.
patent: 4164697 (1979-08-01), Everett
patent: 4214196 (1980-07-01), Boyce
Shoop William M.
T. B. Wood's Sons Company
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