High Frequency, High Efficiency, and High Power Density GaN-Based LLC Resonant Converter: State-of-the-Art and Perspectives

Applied Sciences

Annunziata Sanseverino¹  Enzo De Santis¹  Simone Palazzo¹  Seyed Abolfazl Mortazavizadeh¹  Francesco Velardi¹  Giovanni Busatto¹  Giuseppe Panariello²  Arturo Amendola²  Dario Di Ruzza² 

[1] Department of Electrical and Information Engineering, University of Cassino and Southern Lazio, 03043 Cassino, Italy;Rete Ferroviaria Italiana (RFI), 00161 Roma, Italy;

关键词: LLC;    resonant converter;    GaN HEMT;    review;   

DOI  :  10.3390/app112311350

来源: DOAJ

【 摘 要 】

Soft switching for both primary and secondary side devices is available by using LLC converters. This resonant converter is an ideal candidate for today’s high frequency, high efficiency, and high power density applications like adapters, Uninterrupted Power Supplies (UPS), Solid State Transformers (SST), electric vehicle battery chargers, renewable energy systems, servers, and telecom systems. Using Gallium-Nitride (GaN)-based power switches in this converter merits more and more switching frequency, power density, and efficiency. Therefore, the present paper focused on GaN-based LLC resonant converters. The converter structure, operation regions, design steps, and drive system are described precisely. Then its losses are discussed, and the magnets and inductance characteristics are investigated. After that, various interleaved topologies, as a solution to improve power density and decrease current ripples, have been discussed. Also, some challenges and concerns related to GaN-based LLC converters have been reviewed. Commercially available power transistors based on various technologies, i.e., GaN HEMT, Silicon (Si) MOSFET, and Silicon Carbide (SiC) have been compared. Finally, the LLC resonant converter has been simulated by taking advantage of LTspice and GaN HEMT merits, as compared with Si MOSFETs.

【 授权许可】

Unknown