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High-frequency isolated ac-dc converter with stacked architecture

Author(s)
Bandyopadhyay, Saurav; Lim, Seungbum; Perreault, David J
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DownloadS. Lim, S. Bandyopadhyay, and D.J. Perreault, “High-Frequency Isolated ac-dc Converter with Stacked Architecture,” IEEE Applied Power Electronics Conference, 2017. (1.299Mb)
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Abstract
This paper presents a new isolated ac-dc power converter achieving both high power factor and converter miniaturization suitable for many low power ac-dc applications. The proposed ac-dc converter architecture comprises a line-frequency rectifier, a stack of capacitors, a set of regulating converters, and a multi-input isolated bus converter. Among many suitable circuit implementations, the prototype system utilizes the resonant-transition buck converter as a regulating converter, and the capacitively-aided isolated bus converter for the isolated bus converter. The converter is miniaturized by operating at high frequency (1–10 MHz range), and it buffers the ac-line frequency energy with a pair of stacked ceramic capacitors (1 μΕ and 150 μΕ, 100 V rating) without a requirement for electrolytic capacitors. The prototype converter is implemented to operate from 120 Vac to 12 V, and up to 50 W output as an example isolated ac-dc converter for power supply applications. The prototype converter demonstrates with 88 % efficiency and 0.86 power factor, and provides 50 W/in3 power density, which is five times higher than the power density of typical conventional designs.
Date issued
2017-05
URI
http://hdl.handle.net/1721.1/112227
Journal
2017 IEEE Applied Power Electronics Conference and Exposition (APEC)
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Citation
Lim, Seungbum, Saurav Bandyopadhyay, and David J. Perreault. “High-Frequency Isolated Ac-Dc Converter with Stacked Architecture.” 2017 IEEE Applied Power Electronics Conference and Exposition (APEC) (March 2017).
Version: Author's final manuscript
ISBN
978-1-5090-5366-7
ISSN
1048-2334

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