Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1989-12-21
1991-04-16
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 56, 363 67, H02M 3335
Patent
active
050087940
ABSTRACT:
Flyback converters can generate multiple voltage levels by rectifying and filtering multiple windings on a single power transformer. Different voltages should be related by the turns ratio of the respective windings. Transformer leakage inductance causes leading edge voltage spikes on some windings causing the filters to peak charge to a higher value than expected. The addition of a small coupled inductor between two or more windings will block the leading edge spike allowing the filter to charge to the correct voltage. The turns ratio of the coupled inductor is selected to cancel the leading edge voltage spike on the desired winding. The coupled inductor can be used to correct the voltage of a winding used for feedback purposes as well as improving the cross regulation between multiple converter outputs.
REFERENCES:
patent: 1712677 (1929-05-01), Peter
patent: 4191986 (1980-03-01), Huang et al.
patent: 4703409 (1987-10-01), Spreen
Beha Jr. William H.
Power Integrations, Inc.
Schatzel Thomas E.
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