Design and implementation of LLC resonant converter with high efficiency at light load condition

2010 ◽  
Author(s):  
Ya-Chun Chen ◽  
Tsorng-Juu Liang ◽  
Wei-Jing Tseng ◽  
Jia-You Lee ◽  
Lung-Sheng Yang
Keyword(s):  
High Efficiency ◽  
Load Condition ◽  
Resonant Converter ◽  
Design And Implementation ◽  
Light Load ◽  
Llc Resonant Converter

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 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 High Efficiency Isolated On-Board EV Battery Charger Using LLC Resonant Converter

2021 ◽  
Author(s):  
Sevilay Cetin ◽  
Keyword(s):  
Output Voltage ◽  
High Efficiency ◽  
Load Condition ◽  
Voltage Regulation ◽  
Resonant Converter ◽  
Battery Charger ◽  
Voltage Range ◽  
Wide Range ◽  
Electrical Vehicle ◽  
Llc Resonant Converter

In this study, high efficiency design of an on-board Electrical Vehicle (EV) battery charger is presented. The presented charger has two stages where the first stage is conventional front-end boost converter and the second stage is LLC resonant converter. The basic principles of both stage are discussed and the detailed design procedures are presented in terms of wide range output voltage regulation, wide range load condition, high efficiency and high power density. The presented design approach is tested with a prototype implemented with 2.5 kW output power at 250 V-450 V output voltage range. The peak efficiency of system is obtained as 95.53% at full load condition.

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