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Published January 1991 | public
Journal Article Open

Constant-frequency control of quasi-resonant converters

Abstract

An additional independent control needed to eliminate the undesirable variable switching frequency of quasi-resonant converters can be obtained if the output rectifier is replaced by an active switch. The concept is applicable to all classes of quasi-resonant converters. It is demonstrated that in addition to operation at constant switching frequency, selected classes of constant-frequency quasi-resonant (CF-QR) topologies feature extended range of accessible conversion ratios and load currents. A practical example of a constant-frequency multi-resonant (CF-MR) buck converter operating at 2 MHz is described.

Additional Information

© Copyright 1991 IEEE. Reprinted with permission. Manuscript received September 20, 1989. This paper was presented at the 1989 High Frequency Power Conversion Conference, Naples FL, May 14-18. This work was conducted under the Power Electronics Program supported by grants from Boeing Electronics Company, GTE Communication Systems Corporation, Rockwell, Inc., and EG&G Almond Instruments Inc.

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August 22, 2023
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