scholarly journals The Influence of Parasitic Components on LLC Resonant Converter

Energies ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 4305 ◽  
Author(s):  
Fang Li ◽  
Ruixiang Hao ◽  
Haodong Lei ◽  
Xinyi Zhang ◽  
Xiaojie You
Keyword(s):  
Load Condition ◽  
Equation Model ◽  
Soft Switching ◽  
Resonant Converter ◽  
Practical Applications ◽  
Conduction Loss ◽  
Light Load ◽  
Llc Resonant Converter ◽  
Simulation Results ◽  
Parasitic Components

In recent years, the LLC resonant converter has been widely used in DC–DC conversion applications. However, the parasitic components of the LLC resonant converter have a significant impact in practical applications, such as influence on the conduction loss and the soft-switching of power devices, the voltage oscillation across rectifier diodes, the unregulated output voltage at light load condition and so on. It is hard to analyze the higher-order circuits by the conventional analysis methods. Focusing on the operational principle of the LLC converter with parasitic components, the differential equation model is presented and solved by the numerical method in this paper. The simulation results verify the correctness of the theoretical analysis. The causes of two different frequency oscillations and the voltage spike are clarified. The design considerations and a specific example of the LLC converter are given. The experimental results are consistent with the simulation results, and the soft-switching of primary-side switches can be achieved in the prototype.

scholarly journals Isolated AC/AC Converter with LLC Resonant Converter High Frequency Link and Four-Quadrant Switches in the Output Stage

2020 ◽  
Author(s):  
Leonardo Freire Pacheco ◽  
Ivo Barbi ◽  
Kaio Cesar Maciel Nascimento
Keyword(s):  
Power Distribution ◽  
High Frequency ◽  
Distribution Systems ◽  
Soft Switching ◽  
Switching Frequency ◽  
Resonant Converter ◽  
Output Stage ◽  
Llc Resonant Converter ◽  
Four Quadrant ◽  
High Frequency Ac

An AC-AC converter with high-frequency link employing LLC resonant converter operating in the vicinity of the resonance frequency is studied, in which the output stage is unique and formed by a high-frequency AC-AC converter employing four quadrant switches. The topology, its operation and the modulation strategy are presented. The high-frequency stage switches located on the primary side of the transformer operate with soft switching of the ZVS type, while the four quadrant switches that form the output stage operate with soft switching of the ZCS type. Experimental data on a 1.5 kW experimental prototype that was designed, built and tested in the laboratory, with 220 VRMS input, 220 VRMS output and 40 kHz switching frequency are given in the paper. The studied converter can be considered a candidate for the building block of medium voltage solid-state transformers (SST) for power distribution systems.<br>

scholarly journals Differential Equation Model of the LLC Resonant Converter in the Ideal Case

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5439
Author(s):  
Fang Li ◽  
Haodong Lei ◽  
Ruixiang Hao ◽  
Siwei Liu ◽  
Xiaojie You ◽  
...  
Keyword(s):  
Differential Equation ◽  
Equation Model ◽  
Time Interval ◽  
Resonant Converter ◽  
Differential Equation Model ◽  
Ideal Case ◽  
Operational Principle ◽  
Initial Values ◽  
Llc Resonant Converter ◽  
The Ideal

The LLC resonant converter has been widely used in direct current (DC) power supply applications. However, fundamental harmonic approximation or other simplified analyses will introduce inevitable deviations. Therefore, the differential equation model with numerical solution of the LLC converter is proposed in this paper based on the operational principle of the ideal case. In order to solve the differential equation, initial values need to be substituted. The accurate LLC model based on time interval analysis is very complicated and cannot be used. In this paper, solution methods of the initial values corresponding to different switching frequencies are proposed. The initial values can be solved conveniently. Furthermore, the voltage gain curve is modified by the idealized analysis. Lastly, all the above research is verified by PSIM simulation. The work is helpful to understand the operational principle of the LLC resonant converter.

Energy Feedback Control of Light-Load Voltage Regulation for LLC Resonant Converter

2019 ◽  
Vol 34 (5) ◽  
pp. 4807-4819 ◽  
Author(s):  
Zhijian Fang ◽  
Junhua Wang ◽  
Rong Liu ◽  
Liangle Xiao ◽  
Junkun Zhang ◽  
...  
Keyword(s):  
Feedback Control ◽  
Voltage Regulation ◽  
Resonant Converter ◽  
Load Voltage ◽  
Energy Feedback ◽  
Light Load ◽  
Llc Resonant Converter

Erratum to “Hold-Up Time Compensation Circuit of Half-Bridge LLC Resonant Converter for High Light-Load Efficiency”

2021 ◽  
Vol 36 (2) ◽  
pp. 2446-2446
Author(s):  
Yeonho Jeong ◽  
Min-Su Lee ◽  
Jae-Do Park ◽  
Jae-Kuk Kim ◽  
Ronald A. L. Rorrer
Keyword(s):  
High Light ◽  
Resonant Converter ◽  
Compensation Circuit ◽  
Light Load ◽  
Llc Resonant Converter
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