Symmetrical, phase-shifting, fork transformer

Details Symmetrical, phase-shifting, fork transformer Symmetrical, phase-shifting, fork transformer

1994-06-24

1995-10-03

Wong, Peter S.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

363129, 363 5, 363 64, H02M 700, H02M 706

Patent

active

054557593

ABSTRACT:
In 12-pulse and 18-pulse AC/DC converter systems a single wye connected auto transformer using appropriate segments of voltage from each phase connected in fork fashion is used to develop 6-phase and 9-phase voltages in a symmetrical manner such that inherent compensation is made for the dc converter output voltage to be within 4.2% of that of a 6-pulse converter. Additional design adjustments for step-up or step-down of voltage can be made without compromising the transformer symmetry. An unconnected but closed delta winding provides a path in which third harmonic currents, and multiples thereof can flow.

REFERENCES:
patent: 4876634 (1989-09-01), Paice
patent: 5138544 (1992-08-01), Jessee

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