Evaluation of current stresses in nine-switch energy conversion systems

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Abstract

Converters with reduced-switch counts usually face some performance tradeoffs, which make them suitable for some applications but not others. The same applies to the nine-switch converter, which is a reduced-switch version of the back-to-back twelve-switch converter. The nine-switch converter has since been shown to experience a higher voltage stress, which can be lowered in some cases. A corresponding evaluation of its current stress is however lacking, and is hence addressed now by computing its switch currents when used for ac-ac, ac-dc, dc-ac and dc-dc energy conversions. Relevant expressions, application requirements and simulation results are presented for identifying cases, where the nine-switch converter can have an improvement in performance despite its reduced-switch count. These cases are verified in experiments using a 1.5 kW prototype built in the laboratory.

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Qin, Z., Loh, P. C., Bahman, A. S., & Blaabjerg, F. (2014). Evaluation of current stresses in nine-switch energy conversion systems. IET Power Electronics, 7(11), 2877–2886. https://doi.org/10.1049/iet-pel.2014.0005

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