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An Analysis of Non-Isolated DC-DC Converter Topologies with Energy Transfer Media

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  • Se-Un Shin

    (Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI 48109, USA)

Abstract

As miniaturized mobile devices with various functionalities are highly desired, the current requirement for loading blocks is gradually increasing. Accordingly, the efficiency of the power converter that supports the current to the loading bocks is a critical specification to prolong the battery time. Unfortunately, when using a small inductor for the miniaturization of mobile devices, the efficiency of the power converter is limited due to a large parasitic DC resistance ( R DCR ) of the inductor. To achieve high power efficiency, this paper proposes an energy transfer media (ETM) that can make a switched inductor capacitor (SIC) converter easier to design, maintaining the advantages of both a conventional switched capacitor (SC) converter and a switched inductive (SI) converter. This paper shows various examples of SIC converters as buck, boost, and buck-boost topologies by simply cascading the ETM with conventional non-isolated converter topologies without requiring a sophisticated controller. The topologies with the ETM offer a major advantage compared to the conventional topologies by reducing the inductor current, resulting in low conduction loss dissipated at R DCR . Additionally, the proposed topologies have a secondary benefit of a small output voltage ripple owing to the continuous current delivered to the load. Extensions to a multi-phase converter and single-inductor multiple-output converter are also discussed. Furthermore, a detailed theoretical analysis of the total conduction loss and the inductor current reduction is presented. Finally, the proposed topologies were simulated in PSIM, and the simulation results are discussed and compared with conventional non-isolated converter topologies.

Suggested Citation

  • Se-Un Shin, 2019. "An Analysis of Non-Isolated DC-DC Converter Topologies with Energy Transfer Media," Energies, MDPI, vol. 12(8), pages 1-19, April.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:8:p:1468-:d:223880
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    References listed on IDEAS

    as
    1. Hassan Saif & Yongmin Lee & Hyeonji Lee & Minsun Kim & Muhammad Bilawal Khan & Jung-Hoon Chun & Yoonmyung Lee, 2018. "A Wide Load Current and Voltage Range Switched Capacitor DC–DC Converter with Load Dependent Configurability for Dynamic Voltage Implementation in Miniature Sensors," Energies, MDPI, vol. 11(11), pages 1-21, November.
    2. Van-Thuan Tran & Minh-Khai Nguyen & Youn-Ok Choi & Geum-Bae Cho, 2018. "Switched-Capacitor-Based High Boost DC-DC Converter," Energies, MDPI, vol. 11(4), pages 1-15, April.
    3. Jung-Duk Suh & Yeong-Ho Yun & Bai-Sun Kong, 2019. "High-Efficiency DC–DC Converter with Charge-Recycling Gate-Voltage Swing Control," Energies, MDPI, vol. 12(5), pages 1-12, March.
    4. Miran Rodič & Miro Milanovič & Mitja Truntič & Benjamin Ošlaj, 2018. "Switched-Capacitor Boost Converter for Low Power Energy Harvesting Applications," Energies, MDPI, vol. 11(11), pages 1-29, November.
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