High Step-Up High-Frequency Zero-Voltage Switched GaN-Based Single-Stage Isolated

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: 6Language: englishTyp: PDF

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Jafari, Armin; Matioli, Elison (Power and Wide-band-gap Electronics Research Laboratory (POWERlab), Ecole polytechnique federale de Lausanne (EPFL), Switzerland)

In this work we demonstrate a high step-up singlestage DC-DC micro-converter for photovoltaic (PV) applications. To reduce the size of passive components and the overall system, the circuit was designed to work at a high switching frequency of 300 kHz, by relying on GaN power HEMTs. To reach the high step-up ratio required in this type of applications, we designed a high-frequency planar transformer with high turns ratio, which enabled a high boost of voltage in just a single-stage DC-DC converter with a phase-shifted full-bridge (PSFB) topology, reaching an efficiency of more than 93%.