Phase-controlled reversible power conversion with equal duty cyc

Details Phase-controlled reversible power conversion with equal duty cyc Phase-controlled reversible power conversion with equal duty cyc

1989-09-29

1991-07-02

Stephan, Steven L.

Electric power conversion systems

Current conversion

Having plural converters for single conversion

363 71, 363 95, 307 3, H02M 768

Patent

active

050290649

ABSTRACT:
A universal phase-controlled reversible power converter having one transformer with multiple windings couples a d.c. voltage to an associated transformer winding through a fixed port having controllable switches; and further simultaneously couples any number of a.c., d.c., combination a.c. and d.c. or stochastic voltages, each to an associated transformer winding and each through an associated variable port having a filter with an inductor and controllable switches. All couplings, transpiring in any number of relatively independent ports, are to an equal duty cycle substantially constant amplitude square wave within the transformer's windings. Any number of relatively independent open-loop transfer functions, or closed feedback control loops, may be simultaneously active (i) to control switching in variable ports so as to continuously couple power regardless of its waveform or distortion, or regardless of variations in waveform or distortion even so far as changes between a.c. and d.c., and (ii) to control switching in any of the variable ports so as to cause the port to present a controlled counter emf to a source of power, or any desired output waveform to a sink of power despite any variations in its impedance. Aggregate coupling, and conversion, efficiency ranges to 95% at kilowatt power levels.

REFERENCES:
patent: 3517300 (1970-06-01), McMurray
patent: 4323882 (1982-04-01), Gajjar
patent: 4358716 (1982-11-01), Cordes et al.
patent: 4849870 (1989-07-01), Heinrich
patent: 4872100 (1989-10-01), Diaz
Harada et al., "Phase-Controlled DC-AC Converter with High Frequency Switching"; Jun. 17, 1988, IEEE.

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