Improved LLC resonant converter with wide range input and high efficiency

被引：0
|
作者：
Zhou G.-H. [1 ]
Fan X.-Y. [1 ]
Xu D. [1 ]
Wu S.-R. [1 ]
机构：
[1] College of Electrical Engineering, Southwest Jiaotong University, Chengdu
来源：
Dianji yu Kongzhi Xuebao/Electric Machines and Control | 2020年 / 24卷 / 10期
关键词：
Fixed frequency control; Hybrid mode; LLC resonant converter; Phase shift control; Soft switch; State plane trajectory; Wide input voltage range;
D O I：
10.15938/j.emc.2020.10.002
中图分类号：
学科分类号：
摘要：
Compared with the traditional LLC resonant converter with frequency conversion control, the LLC resonant converter with fixed frequency and phase shift control has the advantages of simple design of magnetic components. However, when the variation ranges of input voltage and load are wide, the efficiency of fixed frequency-controlled LLC resonant converter becomes poor due to large circulating current. To solve the above problems, an improved LLC resonant converter with hybrid-mode fixed frequency control was proposed, which can significantly broaden the voltage gain range of the converter and make the LLC converter adapt to a wider range of voltage input. At the same time, the efficiency of the converter was improved, and it is simple to implement. In the control structure switches of the improved converter, zero voltage switch (ZVS) was achieved, and in the secondary rectifiers diode, zero current switch (ZCS) was achieved, and the circulating current loss is small under all input voltage and output current conditions. The hybrid mode fixed frequency controlled in improved LLC resonant converter was analyzed theoretically in detail by the state plane trajectory model, and the expression of voltage gain and the realization condition of soft switch were derived. Correctness of the theoretical analysis is verified by an experimental prototype with 120-400V input and 300W/48V output. © 2020, Harbin University of Science and Technology Publication. All right reserved.
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页码：9 / 18
页数：9
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