Power converter with output inductance

Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter

Reexamination Certificate

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C363S097000

Reexamination Certificate

active

07050309

ABSTRACT:
In a power converter, the duty cycle of a primary winding circuit causes near continuous flow of power through the primary and secondary winding circuits during normal operation. By providing no regulation during normal operation, a very efficient circuit is obtained with a synchronous rectifier in the secondary operating at all times. However, during certain conditions such as start up or a short-circuit, the duty cycle of the primary may be reduced to cause freewheeling periods. To simplify the gate drive, the synchronous rectifiers may be allowed to turn off during the freewheeling periods, resulting in large ripple. A filter inductance of the secondary winding circuit reduces that ripple, and is sufficient to minimize ripple during normal operation, but still allows large ripple during the freewheeling periods. By accepting large ripple during other than normal operation, a smaller filter inductance can be used.

REFERENCES:
patent: 3663941 (1972-05-01), Pasciutti
patent: 5870299 (1999-02-01), Rozman
patent: 5999417 (1999-12-01), Schlecht
Mweene, L. Haachitaba, et al., “A High-Efficiency 1.5 kW, 390-50 V Half-Bridge Converter Operated at 100% Duty-Ratio,” IEEE, 1992, pp. 723-730.
Mweene, Loveday Haachitaba, “The Design of Front-End DC-DC Converters of Distributed Power Supply Systems with Improved Efficiency and Stability,” Thesis, Massachusetts Institute of Technology, Sep. 1992, pp. 1-184.

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