Analytical Comparison of Dual-Input Isolated dc-dc Converter with an ac or dc Inductor for Renewable Energy Systems

Zhe Zhang, Maria del Carmen Mira Albert, Michael A. E. Andersen

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This paper presents two configurations of dualinput (DI) or three-port (TPC) isolated dc-dc converters for hybrid renewable energy systems such as photovoltaics and batteries. These two converters are derived by integrating an interleaved boost converter and a single-active bridge converter with an ac inductor as a power interfacing element or phase-shift softswitching converter with an output dc inductor. Both converters are controlled by a pulse-width modulation and phase-shift hybrid modulation scheme. The two converter topologies are, even though quite similar from the topological and control perspective, distinct in operation principles, voltage/power transfer functions, loss distributions, soft-switching constraints, and power efficiency under the same operating conditions. Moreover, the inductor
design differs greatly between these two cases. In this paper, a comprehensive comparison is given for the first time and thereby the corresponding design tradeoffs are discussed. Finally, a laboratory 1 kW prototype is constructed and tested to verify the theoretical analysis
Original languageEnglish
Title of host publicationIEEE International Future Energy Electronics Conference 2017
Publication date2017
ISBN (Print)9781509051571
Publication statusPublished - 2017
EventIEEE International Future Energy Electronics Conference 2017 - Kaohsiung, Taiwan, Province of China
Duration: 3 Jun 20177 Jun 2017


ConferenceIEEE International Future Energy Electronics Conference 2017
CountryTaiwan, Province of China


  • Converter
  • dc-dc
  • Multiple inputs
  • Renewable Energies
  • Soft swtiching

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