A large DC-gain highly efficient hybrid switched-capacitor-boost converter for renewable energy systems

Dazhong Gu, Dariusz Czarkowski, Adrian Ioinovici

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A new hybrid switched-capacitor-boost converter in which the energy is processed only once is proposed: the input ports of a switched-capacitor (SC) circuit and a boost power stage are connected in parallel whereas their output ports are connected in series. The SC converter is formed by two sub-stages which are operated with interleaving. It is unregulated. Its capacitors are charged till almost saturation, the difference between the voltages across the capacitors at the end of the charging interval and end of the discharging interval is very small, resulting in a very high efficiency of the capacitors charging process. The purpose of the SC stage is to give most of the voltage step-up gain. It processes most of the energy. Only a small portion of the energy is processed by a PWM boost converter. Its purpose is to assure overall regulation. As the role of this stage is not to step-up the voltage, it can work with a small duty-cycle value, chosen to get the highest possible efficiency. The sub-stages of the SC circuit are interleaved with the boost stage to minimize the input current ripple. As a result, a converter with high efficiency, large voltage step-up, and small input current ripple is obtained. The line and load regulation ability of the new configuration is proved analytically and confirmed experimentally. A 200 W prototype was built to step-up an input voltage of 14 V to 98 V. The measured efficiency is 87%.

Original languageEnglish (US)
Title of host publicationIEEE Energy Conversion Congress and Exposition
Subtitle of host publicationEnergy Conversion Innovation for a Clean Energy Future, ECCE 2011, Proceedings
Pages2495-2500
Number of pages6
DOIs
StatePublished - Nov 28 2011
Event3rd Annual IEEE Energy Conversion Congress and Exposition, ECCE 2011 - Phoenix, AZ, United States
Duration: Sep 17 2011Sep 22 2011

Publication series

NameIEEE Energy Conversion Congress and Exposition: Energy Conversion Innovation for a Clean Energy Future, ECCE 2011, Proceedings

Other

Other3rd Annual IEEE Energy Conversion Congress and Exposition, ECCE 2011
CountryUnited States
CityPhoenix, AZ
Period9/17/119/22/11

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment

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  • Cite this

    Gu, D., Czarkowski, D., & Ioinovici, A. (2011). A large DC-gain highly efficient hybrid switched-capacitor-boost converter for renewable energy systems. In IEEE Energy Conversion Congress and Exposition: Energy Conversion Innovation for a Clean Energy Future, ECCE 2011, Proceedings (pp. 2495-2500). [6064100] (IEEE Energy Conversion Congress and Exposition: Energy Conversion Innovation for a Clean Energy Future, ECCE 2011, Proceedings). https://doi.org/10.1109/ECCE.2011.6064100