Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1983-09-19
1985-12-17
Wong, Peter S.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 98, H02M 114
Patent
active
045595933
ABSTRACT:
A method and apparatus for controlling switches in an n-phase static inverter of the bridge type is disclosed wherein the inverter includes n pairs of switches connected across two DC voltages, with a phase output being developed at the junction between switches of each pair. In such an inverter, at any particular time, n.sub.1 phase outputs are connected to one of the DC voltages while n.sub.2 phase outputs are connected to the other DC voltage, where n.sub.1 .ltoreq.n.sub.2 and n.sub.1 +n.sub.2 =n. The n.sub.1 phase outputs are identified by logic circuitry and the switches associated with such phase outputs are operated during times when a pulse width modulation waveform is in a low state so that all phase outputs are connected to the same DC voltage. The method and apparatus of the present invention reduces the number of switching occurrences to the minimum required to achieve defined applied voltage pulse width modulation. Further, the method and apparatus of the present invention does not result in the generation of regenerative currents, and hence various types of DC sources may be used and the DC bus filter may be reduced or eliminated.
REFERENCES:
patent: 3523236 (1970-08-01), Howell et al.
patent: 3538420 (1970-11-01), Klein
patent: 3609507 (1971-09-01), Beck
patent: 3694718 (1972-09-01), Graf et al.
patent: 3971972 (1976-07-01), Stich
patent: 4291368 (1981-09-01), Yarema et al.
Ault Anita M.
Sundstrand Corporation
Wong Peter S.
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