TY - GEN
T1 - Enhanced bipolar Stacked Switched Capacitor energy buffers
AU - Afridi, Khurram K.
AU - Chen, Minjie
AU - Perreault, David J.
PY - 2012/12/17
Y1 - 2012/12/17
N2 - 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.
AB - 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.
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U2 - 10.1109/ECCE.2012.6342251
DO - 10.1109/ECCE.2012.6342251
M3 - Conference contribution
AN - SCOPUS:84870915867
SN - 9781467308014
T3 - 2012 IEEE Energy Conversion Congress and Exposition, ECCE 2012
SP - 4209
EP - 4216
BT - 2012 IEEE Energy Conversion Congress and Exposition, ECCE 2012
T2 - 4th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2012
Y2 - 15 September 2012 through 20 September 2012
ER -