Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1983-11-16
1985-06-11
Wong, Peter S.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
307110, 320 1, 363 17, 363 43, 363 98, H02M 7515
Patent
active
045232695
ABSTRACT:
A DC to N phase AC converter, where N is an integer greater than 2, includes a DC source having first and second terminals for deriving equal amplitude opposite polarity DC voltages, a series resonant circuit, and N output terminals, one for each phase of the converter. The series resonant circuit is selectively connected in series with the first and second terminals and the N output terminals for an interval equal to one half cycle of the resonant circuit resonant frequency, so that current flows between a selected one of the first and second terminals and the resonant circuit and a selected one of the N output terminals during the interval. The resonant circuit current is zero at the beginning and end of the interval. A capacitor shunting each of the output terminals has a value relative to the capacitance of the series resonant circuit such that the voltage across each output terminal remains approximately constant between adjacent exchanges of energy between the resonant circuit and the output terminal. The selective connection is in response to a comparison of the actual voltage across each of the N output terminals and a reference voltage for each of the N output terminals. The comparison controls when the flow of current between the selected first and second terminals and the selected output terminal via the resonant circuit begins. The frequency of the AC voltage developed across the N output terminals is much less than the resonant frequency of the circuit.
REFERENCES:
patent: 3902107 (1975-08-01), Brown
patent: 3939392 (1976-02-01), Chalmers et al.
patent: 4191993 (1980-03-01), Kratz et al.
patent: 4191994 (1980-03-01), Kratz et al.
Baker Richard H.
Chambers Derek
Chu David L.
Hudak James A.
Rebsch D. L.
Reliance Electric Company
Wong Peter S.
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