Importance

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Abstract

1. In an apparatus for transferring electrical energy between a unidirectional potential circuit and an alternating potential circuit, a pair of unidirectional potential busses adapted to be connected to the unidirectional potential circuit, a pair of alternating potential busses adapted to be connected to the alternating potential circuit, a transformer having first and second winding parts, said second winding part having first and second pairs of connections, means connecting said first winding part to said alternating potential busses, first and second separately energized current conducting paths connecting said first pair of connections of said second winding part to said unidirectional potential busses for transfer of energy from said unidirectional busses to said alternating potential busses, said first path when conductive being effective to conduct current between said unidirectional busses in one direction and through a first portion of said second winding part in a first direction to thereby induce a potential of a first polarity in said first winding part, said second path when conductive being effective to conduct current between said unidirectional busses in said one direction and through said first portion of said second winding part in a direction opposite to said first direction to thereby induce a potential of a second polarity in said first winding part, said second polarity being opposite to said first polarity, third and fourth separately energized current conducting paths connecting said second pair of connections of said second winding part to said unidirectional potential busses for transfer of energy from said alternating potential busses to said unidirectional potential busses, said third path when conductive being operable to conduct current between said unidirectional busses in a second direction through a second portion of said second winding part, said fourth path when conductive being operable to conduct current between said unidirectional busses in said second direction through said second portion of said second winding part, the turns of said winding parts being arranged such that the ratio of the turns of said first winding part with respect to the turns of said second winding part which are located between said first connections is greater than the ratio of the turns of said first winding part with respect to the turns of said second winding part which are located between said second connections, and means rendering said first path conductive solely for a first predetermined interval of each first half cycle of current flow through one of said winding parts and thereafter rendering conductive for the remainder of each of first half cycles of said current in said one winding part the one of said third and fourth paths which connects the said second pair of connections for the flow of current from the most positive one of said second pair of connections to the most negative one of said second pair of connections, said last-named means being operable to render said second path conductive solely for a second predetermined interval of each second half cycle of the current flow through said one winding part and thereafter rendering conductive for the remainder of each of said second half cycle of said current in said one winding part the other of said third and fourth paths.

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First Claim