High-frequency isolated ac-dc converter with stacked architecture
Author(s)Bandyopadhyay, Saurav; Lim, Seungbum; Perreault, David J
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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.
2017 IEEE Applied Power Electronics Conference and Exposition (APEC)
Institute of Electrical and Electronics Engineers (IEEE)
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).
Author's final manuscript