基于柔性电感的恒频控制LLC谐振变换器  

Constant-frequency Controlled LLC Resonant Converter Based on Flexible Inductor

作　　者：王锐 阚加荣[2] WANG Rui;KAN Jiarong(School of Electrical and Information Engineering,Jiangsu University,Zhenjiang 212013,China;School of Electrical Engineering,Yancheng Institute of Technology,Yancheng 224051,China)

机构地区：[1]江苏大学电气信息工程学院,镇江212013 [2]盐城工学院电气工程学院,盐城224051

出　　处：《电源学报》2022年第1期28-35,共8页Journal of Power Supply

基　　金：国家自然科学基金资助项目(51577164);江苏省第五期333工程资助项目;江苏省六大人才高峰人才资助项目(XNY-045);江苏省高校青蓝工程资助项目。

摘　　要：传统LLC谐振变换器采用变频控制,在输入电压变化范围较宽时开关频率变化范围宽,其磁性元件难以优化设计。将LLC谐振变换器中的谐振电感设计为柔性电感,通过改变柔性电感的电感而改变变换器的谐振频率,改变LLC变换器的输出特性,实现宽输入电压、宽负载范围内的恒频调压,进而可以实现变压器、电感、滤波电容等元件的优化设计。首先介绍了柔性电感的原理,分析了采用柔性电感的全桥LLC谐振变换器的工作特性,并给出了闭环恒频控制的实现方案。最后通过一台输入电压23~35 V、输出电压100 V、功率200 W的原理样机,验证了基于柔性电感的恒频控制LLC谐振变换器的可行性。The variable-frequency strategy is a commonly used method for regulating the voltage in an LLC resonant converter.If the input voltage varies widely,then the switching frequency of the converter will be operated in a wide range,which results in difficulty in designing magnetic components.In this paper,the resonant inductor in the LLC resonant converter is designed as a flexible inductor.The resonant frequency of the LLC resonant converter and its output characteristics can be regulated by changing the inductance of the flexible inductor.As a result,the constant-frequency voltage regulation can be realized even if the input voltage and loads vary widely.Moreover,the design of components such as transformer,inductor,and filter capacitor can be optimized.The principle of the flexible inductor is introduced,and the operation characteristics of the full-bridge LLC resonant converter with the flexible inductor are analyzed.The implementation scheme of closed-loop constant-frequency control was given,and the experimental results of a 200 W prototype with 23~35 V input voltage and 100 V output voltage validated the effectiveness of the constant-frequency controlled LLC resonant converter based on a flexible inductor.

关 键 词：LLC谐振 柔性电感 恒频控制 

分 类 号：TM46[电气工程—电器]