Three-phase ac to dc power converter with power factor correctio

Details Three-phase ac to dc power converter with power factor correctio Three-phase ac to dc power converter with power factor correctio

1984-01-23

1987-07-14

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

313 44, 313 11, H02M 112, H02M 7155

Patent

active

046806890

ABSTRACT:
A system for converting three-phase AC to DC voltage employs three separate converter circuits having their outputs connected in parallel to reduce current harmonics. Each converter circuit includes a full wave rectifier feeding a pulse width current modulator which modulates the DC current flow to the load in a manner to maintain the magnitude of the DC current proportional to the instantaneous magnitude of the DC voltage. The current modulators act as substantially resistive loads to reduce source current harmonics and correct the power factor. The modulators include a pair of transistors connected in a push-pull circuit which are controlled by an oscillator circuit to modulate the DC current at a frequency which is many orders of magnitude greater than the line frequency of the AC source. The DC current outputs of the modulators are coupled through DC/DC isolation transformers to the load.

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Design and Manufacturing Guidelines-NAVMA7 P4855-1, "Navy Power Supply Reliably", Department of the Navy, Dec., 1982.

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