Enhanced bipolar Stacked Switched Capacitor energy buffers

Khurram K. Afridi, Minjie Chen, David J. Perreault

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

5 Scopus citations


The Stacked Switched Capacitor (SSC) energy buffer is a recently proposed architecture for buffering energy between single-phase ac and dc. When used with film capacitors, it can increase the life of grid-interfaced power converters by eliminating limited-life electrolytic capacitors while maintaining comparable energy density. This paper introduces an enhanced version of the bipolar SSC energy buffer that achieves a higher effective energy density and round-trip efficiency, while maintaining the same bus voltage ripple ratio as the original design. Furthermore, the enhanced buffer uses fewer capacitors and switches than the original design. The enhancement in performance is achieved by modifying the control and switching patterns of the buffer switches. A prototype enhanced SSC energy buffer, designed for a 320 V bus and a 135 W load, has been built and tested. The design methodology and experimental results for the enhanced SSC energy buffer are presented and compared with the original design. The paper also presents a comparison of unipolar and bipolar SSC energy buffers. It is shown that while bipolar designs are superior in terms of effective energy density at low ripple ratios, unipolar designs can outperform bipolar designs at high ripple ratios.

Original languageEnglish (US)
Title of host publication2012 IEEE Energy Conversion Congress and Exposition, ECCE 2012
Number of pages8
StatePublished - 2012
Externally publishedYes
Event4th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2012 - Raleigh, NC, United States
Duration: Sep 15 2012Sep 20 2012

Publication series

Name2012 IEEE Energy Conversion Congress and Exposition, ECCE 2012


Other4th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2012
Country/TerritoryUnited States
CityRaleigh, NC

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Fuel Technology


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