High efficiency and high power factor single-stage

May 14th, 2015
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— In this paper, a high efficiency and high power factor single-stage balanced forward-flyback converter merging a foward and flyback converter topologies is proposed. The conventional AC/DC flyback converter can achieve a good power factor but it has a high offset current through the transformer magnetizing inductor, which results in a large core loss and low power conversion efficiency.

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13 High Efficiency And High Power Factor Single StageHigh efficiency and high power factor single-stagebalanced forward-flyback converterYoon Choi, Moon-Hwan Keum, and Sang-Kyoo HanJeong-il KangPower Electronics System Laboratory, POESLAKookmin UniversitySeoul, 136-702, Republic of KoreaE-mail : djhan@kookmin.ac.krVisual Display, R&D TeamSamsung Electronics. Co. Ltd.Suwon, Republic of KoreaE-mail : jeongil.kang@samsung.comAbstract In this paper, a high efficiency and high powerfactor single-stage balanced forward-flyback converter merging a foward and flyback converter topologies is proposed. Theconventional AC/DC flyback converter can achieve a good power factor but it has a high offset current through the transformer magnetizing inductor, which results in a large core loss and low power conversion efficiency. And, the conventional forwardconverter can achieve the good power conversion efficiency with the aid of the low core loss but the input current dead zone near zero cross AC input voltage deteriorates the power factor. On the other hand, since the proposed converter can operate as theforward and flyback converters during switch on and off periods, respectively, it cannot only perform the power transfer during an entire switching period but also achieve the high power factor due to the flyback operation. Moreover, since the currentbalanced capacitor can minimize the offset current through the transformer magnetizing inductor regardle

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