H - Electricity – 02 – H
Patent
H - Electricity
02
H
321/55
H02H 7/122 (2006.01) H02M 7/5387 (2006.01)
Patent
CA 1216626
Method and Apparatus for Controlling Switches in an Inverter Abstract A method and apparatus for controlling switches in an n-phase static inverter of the bridge type is dis- closed 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, n1 phase outputs are connected to one of the DC voltages while n2 phase outputs are connected to the other DC vol- tage, where n1 ? n2 and n1 + n2 = n. The n1 phase out- puts are identified by logic circuitry and the sw?tches 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 in- vention reduces the number of switching occurrences to the minimum required to achieve defined applied voltage pulse width modulation. Further, the method and appara- tus of the present invention does not result in the gene- ration of regenerative currents, and hence various types of DC sources may be used and the DC bus filter may be reduced or eliminated.
462094
Riches Mckenzie & Herbert Llp
Sundstrand Corporation
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