Rectifier transformer

Claim 1

A rectifier transformer circuit adapted for connection to a three-phase power frequency system for providing a rectified ac signal at a predetermined phase shift, without the necessity of using a phase shift transformer, or an interphase transformer, said rectifier transformer circuit comprising: means providing a magnetic flux path circuit including a magnetic core having an iron flux return path; electrical winding means; said electrical winding means including a zig-zag wye primary winding adapted for connection to said three-phase power frequency system, and a single six-phase star secondary winding: said zig-zag wye primary winding including three coils each having a zig portion having N 1 turns and a zag portion having N 2 turns, with the number of said turns being selected to obtain a predetermined phase shift φ between said primary and secondary windings according to the relationship: ##EQU2## said six-phase star secondary winding having a common terminal and a plurality of output terminals, wherein said iron flux return path allows: (a) the voltage at said common terminal to oscillate, and (b) each phase of the secondary winding to carry current for one-third of a power frequency cycle; and a plurality of rectifier means each having first and second terminals, said first terminals each being connected to one of said plurality of output terminals and said second terminals being connected together, such that said rectified ac signal is produced between said common terminal and said second terminals.