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Chen, Minjie; Perreault, David J.; Afridi, Khurram (2012)
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Languages: English
Types: Article
Subjects:

Classified by OpenAIRE into

ACM Ref: Hardware_GENERAL, Hardware_INTEGRATEDCIRCUITS
Electrolytic capacitors are often used for energy buffering applications, including buffering between single-phase ac and dc. While these capacitors have high energy density compared to film and ceramic capacitors, their life is limited. This paper presents a stacked switched capacitor (SSC) energy buffer architecture and some of its topological embodiments, which when used with longer life film capacitors overcome this limitation while achieving effective energy densities comparable to electrolytic capacitors. The architectural approach is introduced along with design and control techniques. A prototype SSC energy buffer using film capacitors, designed for a 320 V dc bus and able to support a 135 W load, has been built and tested with a power factor correction circuit. It is shown that the SSC energy buffer can successfully replace limited-life electrolytic capacitors with much longer life film capacitors, while maintaining volume and efficiency at a comparable level.
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