Highly Efficient Low-Voltage DC-DC Converter at 2-5 MHz with High Operating Current Using GaN Gate Injection Transistors

Conference: PCIM Europe 2014 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05/20/2014 - 05/22/2014 at Nürnberg, Deutschland

Proceedings: PCIM Europe 2014

Pages: 8Language: englishTyp: PDF

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Umeda, Hidekazu; Kinoshita, Yusuke; Ujita, Shinji; Morita, Tatsuo; Tamura, Satoshi; Ishida, Masahiro; Ueda, Tetsuzo (Green Innovation Development Center, Automotive & Industrial Systems Company, Panasonic Corporation, 1 Kotari-Yakemachi, Nagaokakyo-shi, Kyoto 617-8520, Japan)

Highly efficient conversions from 12 V to 1.2 V are confirmed at 2-5 MHz with high output current by DC-DC converters using Gallium Nitride (GaN) Gate Injection Transistors (GITs). Reduction of the gate lengths of the GITs with optimized structure designs reduces the RonQg down to 19.1 mOmeganC, which is a figure-of-merit for high speed switching. The peak operating efficiency at 2 MHz reaches 90% together with high output current of 50 A by the single-phase operation. The operating frequency can be increased to 5 MHz by the GaN-based DC-DC converter with the peak efficiency as high as 81%, which cannot be achieved by existing Si-based converters.