scholarly journals A Si-FET-Based High Switching Frequency Three-Level LLC Resonant Converter

Energies ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 3082
Author(s):  
Yang ◽  
Han
Keyword(s):  
Optimal Design ◽  
High Performance ◽  
Input Voltage ◽  
Switching Frequency ◽  
Design Consideration ◽  
Resonant Converter ◽  
Switching Losses ◽  
High Switching Frequency ◽  
Llc Resonant Converter ◽  
Resonant Inductor

This paper highlights the proposed silicon field-effect transistor (Si-FET)-based high switching frequency three-level (TL) LLC resonant converter. It provides a detailed operational analysis of the converter; the multilevel (ML) organization of cells; voltage-balancing principles; current-balancing principles; loss comparison between Si-FETs and gallium-nitride (GaN)-FETs; and an optimal design consideration based on loss analysis. This analysis reveals that the switching losses of all power switches can be considerably reduced as the voltage across each switch can be set to half of the input voltage without an additional circuit or control strategy. Moreover, the current of each resonant inductor is automatically balanced by a proposed integrated magnetic (IM)-coupled inductor. Therefore, the operating frequency can be easily increased to near 1 MHz without applying high-performance switches. In addition, the resonant tanks of the converter can be a group of cells for multilevel operation, which indicates that the voltage across each switch is further reduced as more cells are added. Based on the results of the analysis, an optimal design consideration according to the resonant tank and switching frequency is discussed. The proposed converter was validated via a prototype converter with an input of 390 V, an output of 19.5 V/18 A, and a frequency of 1 MHz.

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.

Design and Implementation of LLC Resonant Converter for Photovoltaic Battery Charging Application

2015 ◽  
Vol 785 ◽  
pp. 101-105
Author(s):  
Adrian Soon Theam Tan ◽  
Shahid Iqbal
Keyword(s):  
High Efficiency ◽  
Input Voltage ◽  
Voltage Regulation ◽  
Photovoltaic System ◽  
Resonant Converter ◽  
Battery Charging ◽  
Zero Voltage Switching ◽  
Design And Implementation ◽  
Switching Losses ◽  
Llc Resonant Converter

Photovoltaic power conditioning system (PVPCS) requires a high efficiency dc-dc converterstage capable of wide input voltage regulation and have the ease of maximum power point implementation for both stand alone photovoltaic system and grid-connected system. Galvanic isolation at the dc-dc stage can replace the isolation needed in the inverter stage and thus reduce the sizeof isolation transformer and increases overall system efficiency. This paper presents detailed analysis,design and implementation of a LLC resonant converter for photovoltaic battery charging application.The LLC resonant converter operate with zero voltage switching (ZVS) turn on and low current turnoff thus reducing switching losses. The experimental results are given to validate the operation andperformance of the converter.

scholarly journals A Comprehensive Overview in Control Algorithms for High Switching-Frequency LLC Resonant Converter

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4455
Author(s):  
Hwa-Pyeong Park ◽  
Mina Kim ◽  
Jee-Hoon Jung
Keyword(s):  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
High Power ◽  
Power Conversion ◽  
Voltage Regulation ◽  
Control Algorithms ◽  
Switching Frequency ◽  
Resonant Converter ◽  
High Switching Frequency ◽  
Llc Resonant Converter

An LLC resonant converter has been widely used in various industrial applications because of its high cost-effectiveness, high power conversion efficiency, simple design methodology, and simple control algorithms using a pulse frequency modulation (PFM). In addition, the soft switching capability of the LLC resonant converter is good to obtain high switching frequency operations, which can get the high-power density of the power converter. Over the past years, several studies have been conducted to improve the performance of a high switching frequency LLC resonant converter with resonant tank design, optimal power stage design, and enhanced control algorithms. This paper is the review paper in terms of the control algorithms for the LLC resonant converter. It focuses on the overview of the high switching-frequency LLC resonant converter in terms of the control algorithms. The advanced control algorithm can improve power conversion efficiency, dynamic performance, tight output voltage regulation, and small electro-magnetic interference. The operational principles of the control algorithms are briefly explained to show their own characteristics and advantages. Thereafter, the research issues for the future works will be discussed in the conclusion.

scholarly journals High-Frequency LLC Resonant Converter with GaN Devices and Integrated Magnetics

Energies ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1781 ◽  
Author(s):  
Yu-Chen Liu ◽  
Chen Chen ◽  
Kai-De Chen ◽  
Yong-Long Syu ◽  
Meng-Chi Tsai
Keyword(s):  
High Frequency ◽  
High Efficiency ◽  
Power Converter ◽  
Maximum Efficiency ◽  
Switching Frequency ◽  
Resonant Converter ◽  
Leakage Inductance ◽  
Llc Resonant Converter ◽  
Resonant Inductor ◽  
Secondary Side

In this study, a light emitting diode (LED) driver containing an integrated transformer with adjustable leakage inductance in a high-frequency isolated LLC resonant converter was proposed as an LED lighting power converter. The primary- and secondary-side topological structures were analyzed from the perspectives of component loss and component stress, and a full-bridge structure was selected for both the primary- and secondary-side circuit architecture of the LLC resonant converter. Additionally, to achieve high power density and high efficiency, adjustable leakage inductance was achieved through an additional reluctance length, and the added resonant inductor was replaced with the transformer leakage inductance without increasing the amount of loss caused by the proximity effect. To optimize the transformer, the number of primary- and secondary-side windings that resulted in the lowest core loss and copper loss was selected, and the feasibility of the new core design was verified using ANSYS Maxwell software. Finally, this paper proposes an integrated transformer without any additional resonant inductor in the LLC resonant converter. Transformer loss is optimized by adjusting parameters of the core structure and the winding arrangement. An LLC resonant converter with a 400 V input voltage, 300 V output voltage, 1 kW output power, and 500 kHz switching frequency was created, and a maximum efficiency of 97.03% was achieved. The component with the highest temperature was the transformer winding, which reached 78.6 °C at full load.

Design of Magnetic Integrated Transformer for LLC Resonant Converter

2014 ◽  
Vol 1070-1072 ◽  
pp. 1621-1624
Author(s):  
Tong Li Wu ◽  
Ke Hong Wang ◽  
Jia Jia Yang
Keyword(s):  
Electric Vehicle ◽  
Design Process ◽  
Switching Frequency ◽  
Resonant Converter ◽  
Test Results ◽  
Magnetic Components ◽  
Series Resonant ◽  
Design Values ◽  
Llc Resonant Converter ◽  
Resonant Inductor

There are altogether three magnetic components in the resonant tank of LLC resonant converter: the series resonant inductor, the parallel inductor and the transformer. The method to realize the magnetic integrated transformer in LLC resonant converter is presented. The design process is provided, and a magnetic integrated transformer is constructed and the test results correspond well with the design values. A prototype of 1350 W, 100 kHz LLC resonant converter type electric vehicle DC/DC converter equipped with the magnetic integrated transformer is built to verify the performance of the magnetic integrated transformer, and the efficiency at 320 V input, 13.5 V/100 A output is 91.5% at the switching frequency of 100 kHz.

Univesal Design of LLC Resonant Converter with Fixed Switching Frequency

2020 ◽  
Author(s):  
Jiangtao Xu ◽  
Yun Wei ◽  
Xin Cheng ◽  
Hua Yang ◽  
Hongxiang Xue ◽  
...  
Keyword(s):  
Switching Frequency ◽  
Resonant Converter ◽  
Llc Resonant Converter
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