Compact Bidirectional GaN Buck-Boost Converter for Negative Rail Supply in Bipolar DC-Grids

Conference: PCIM Europe 2018 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
06/05/2018 - 06/07/2018 at Nürnberg, Deutschland

Proceedings: PCIM Europe 2018

Pages: 8Language: englishTyp: PDF

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Kloetzer, S.; Fahlbusch, S.; Mueter, U.; Hoffmann, K.F. (Helmut Schmidt University, Faculty of Electrical Engineering, Department of Power Electronics, Germany)

A volume and weight optimized high-frequency bidirectional buck-boost converter for negative rail supply of modern bipolar DC micro-grids up to -300V is presented. By use of state-of-the-art eGaNHEMTs and ZVS turn-on, switching frequencies far beyond the range of similarly rated silicon based converters can be achieved. This enables higher power density while maintaining high efficiency of more than 97% at rated output power of 3kW. The proposed converter achieves soft turn-on for each operating point by using a control principle that only requires the measurement of DC-values.