Advantages of using a two-switch forward in single-stage power factor corrected power supplies

Lars Petersen

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A single-stage power factor corrected power supply using a two-switch forward is proposed to increase efficiency. The converter is operated in the DCM (discontinues conduction mode) and it is shown that this operation mode ensures the intermediate DC-bus to be controlled only by means of circuit parameters and therefore independent of load variations. The DCM operation often has a diminishing effect on the efficiency but by use of the two-switch topology high efficiency with minimum circuit complexity can be achieved in this mode. A 500 W 70 V prototype of the two-switch boost-forward PFC power supply has been implemented. The measured efficiency is between 85% and 88.5% in the range 30 W-500 W and the measured power factor at full load is 0.95.
Original languageEnglish
Title of host publicationProceedings of Telecommunications Energy
Place of PublicationPhoenix, AZ
Publication date2000
ISBN (Print)0-7803-6407-4
Publication statusPublished - 2000
EventTwenty-Second International Telecommunications Energy Conference - Hyatt Regency Phoenix, Phoenix, United States
Duration: 10 Sep 200414 Sep 2004
Conference number: 22


ConferenceTwenty-Second International Telecommunications Energy Conference
LocationHyatt Regency Phoenix
CountryUnited States

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