scholarly journals High-Efficiency Bidirectional LLC Resonant Converter with Primary Auxiliary Windings

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4692 ◽  
Author(s):  
Eun-Soo Kim ◽  
Jae-Sung Oh
Keyword(s):  
Power Flow ◽  
Mutual Coupling ◽  
High Efficiency ◽  
High Gain ◽  
Resonant Converters ◽  
Resonant Converter ◽  
Llc Resonant Converter

In this paper, high-efficiency bidirectional LLC resonant converters with primary auxiliary windings in transformers of resonant circuits are proposed. Even though resonant capacitors are used on the primary and secondary sides, the proposed converter can operate, regardless of the direction of the power flow, with the high gain characteristics of the LLC resonant converter without the mutual coupling of resonant capacitors. The operation principles and gain characteristics of the proposed bidirectional DC–DC converters are described in detail. A 3.3 kW prototyped bidirectional LLC resonant converter for interfacing 750 VDC buses was built and tested to verify the effectiveness and applicability of this proposed converter.

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

2021 ◽  
Vol 11 (23) ◽  
pp. 11350
Author(s):  
Seyed Abolfazl Mortazavizadeh ◽  
Simone Palazzo ◽  
Arturo Amendola ◽  
Enzo De Santis ◽  
Dario Di Ruzza ◽  
...  
Keyword(s):  
Power Density ◽  
High Power ◽  
High Frequency ◽  
High Efficiency ◽  
Resonant Converters ◽  
Switching Frequency ◽  
High Power Density ◽  
Resonant Converter ◽  
Gan Hemt ◽  
Llc Resonant Converter

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.

scholarly journals A High Efficiency LED Driver Circuit using LLC Resonant Converter

2010 ◽  
Vol 15 (1) ◽  
pp. 35-42 ◽  
Author(s):  
Dae-Seong Shin ◽  
Young-Jin Jung ◽  
Sung-Soo Hong ◽  
Sang-Kyu Han ◽  
Byung-Jun Jang ◽  
...  
Keyword(s):  
High Efficiency ◽  
Resonant Converter ◽  
Led Driver ◽  
Driver Circuit ◽  
Llc Resonant Converter

scholarly journals Optimal Design of a High Efficiency LLC Resonant Converter with a Narrow Frequency Range for Voltage Regulation

Energies ◽  
2018 ◽  
Vol 11 (5) ◽  
pp. 1124 ◽  
Author(s):  
Junhao Luo ◽  
Junhua Wang ◽  
Zhijian Fang ◽  
Jianwei Shao ◽  
Jiangui Li
Keyword(s):  
Optimal Design ◽  
High Efficiency ◽  
Voltage Regulation ◽  
Resonant Converter ◽  
Frequency Range ◽  
Llc Resonant Converter ◽  
Narrow Frequency Range

scholarly journals Accurate Design of High-Efficiency LLC Resonant Converter With Wide Output Voltage

IEEE Access ◽  
2017 ◽  
Vol 5 ◽  
pp. 26653-26665 ◽  
Author(s):  
Hengshan Xu ◽  
Zhongdong Yin ◽  
Yushan Zhao ◽  
Yongzhang Huang
Keyword(s):  
Output Voltage ◽  
High Efficiency ◽  
Resonant Converter ◽  
Accurate Design ◽  
Llc Resonant Converter

scholarly journals Dual Interleaved LLC Converter for High Power Applications and Wide Load Range

2019 ◽  
Vol 25 (3) ◽  
pp. 4-9
Author(s):  
Michal Frivaldsky ◽  
Jan Morgos ◽  
Andrej Kanovsky
Keyword(s):  
High Power ◽  
High Efficiency ◽  
Negative Impact ◽  
Power Converter ◽  
Switching Frequency ◽  
Resonant Converter ◽  
Load Range ◽  
High Switching Frequency ◽  
Llc Resonant Converter ◽  
Operational Range

Dual interleaved LLC resonant converter with half bridge topology of main circuit characterized by high switching frequency (500 kHz), high power density (60 W/inch3) and high efficiency (above 96 %) over entire operational range (20 %–100 %) is described. Focus was given on the practical design of power converter, which will be able to fulfil requirements on wide load range operation characterized by upcoming normative. Since proposed topology is based on dual interleaved LLC converter, the resonant component´s critical tolerance was also investigated to secure reliable and optimal operational point. Consequently, proposals for elimination of intolerance negative impact are also described. The results of theoretical analysis were verified directly through experimental measurements. Experimental results are finally compared with upcoming industrial standard 80 Plus Titanium.

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