Abstract
A philosophy for the improvement of the extraction of controlled dc power from a polyphase ac supply line is presented. Extension of this philosophy for the interface of synchronous polyphase networks is briefly indicated. The needed kilovolt-ampere capacity of the supply line is reduced to nearly two thirds of the capacity needed for conventional controlled ac/dc converter systems. The new system requires only a small fraction of the physical weight of conventional converters. The improvements are derived from the interposition of a modulated high-power frequency carrier between the linked systems for the purpose of reconciliation of their conflicting characteristics. The harmonic content of the ac-phase currents is greatly reduced. The system operates with internal frequencies near 10 kHz; efficiencies in the upper nineties have been attained with this type of converter.
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