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Copyright of Science: Future of Lithuania / Mokslas: Lietuvos Ateitis is the property of Vilnius Gediminas Technical University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Science: Future of Lithuania / Mokslas: Lietuvos Ateitis is the property of Vilnius Gediminas Technical University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In this paper the investigation results of a boost Flyback convert-er, which is used in a micro-inverter, are presented. The efficien-cy characteristics of the converter at various carrier frequencies and output loads were investigated. An alternative circuit diagram solution, which is less complex in structure and has fever com-ponents but has the same properties as the classic circuit scheme, for the converter is proposed. The proposed Flyback converter is less expensive. Its efficiency is 2–3 % higher than the classic Flyback converter when the converter output power is less than 95 W. Santrauka Darbe tirtas fotovoltinės energijos moduliams skirto mikroinverterio įtampą aukštinantis Flyback topologijos keitiklis. Ištirtos šio keitiklio naudingumo faktoriaus charakteristikos esant įvairioms nešlio dažnių ir keitiklio tiekiamos energijos galioms. Ištyrus klasikinį keitiklį, pasiūlytas patobulintas keitiklis, kuriame naudojama mažiau elektronikos komponentų. Pasiūlytas Flyback keitiklis yra pigesnis. Jo naudingumo faktorius yra 2–3 % aukštesnis už klasikinio, kai tiekiama keitiklio galia nesiekia 95 W. Reikšminiai žodžiai: Flyback keitiklis, tinklo mikroinverteris, impulso pločio moduliacija, naudingumo faktorius.