基于简化线性模型的LLC谐振变换器双环控制策略  

Double Loop Control Strategy of LLC Resonant Converter Based on Simple Linearized Model

作　　者：晋建厂 Jin Jianchang(Naval Armament Department of PLAN,Beijing 100841,China)

机构地区：[1]海军装备部,北京100841

出　　处：《船电技术》2020年第S01期18-23,共6页Marine Electric & Electronic Engineering

摘　　要：本文提出了一种基于LLC谐振变换器简化线性模型的双环控制策略,通过引入谐振电流有效值反馈,改善了LLC谐振变换器的动态性能。文章首先采用描述函数法建立了LLC谐振变换器的基波大信号模型,然后忽略高频非主导极点的影响,并对变换器稳态增益曲线近似线性化,建立了LLC谐振变换器二阶等效线性模型,进而提出了输出电压外环、谐振电流有效值内环反馈的双环控制策略,并给出了控制器的设计方法。This paper proposes a double loop control strategy of LLC resonant converter based on simple linearized model.Resonant current feedback is used in this strategy to improve the dynamic performance of LLC resonant converter.Firstly the large signal model of LLC resonant converter is built using extended description function.Then the high frequency poles are ignored and the steady state gain curve is linearized.The simple linearized 2 order model of LLC resonant converter is obtained.Based on this model,the double loop control strategy is proposed.Outer loop uses the output voltage feedback and inner loop uses the resonant current feedback.The design method of this strategy is also given in this paper.

关 键 词：LLC谐振变换器 线性化 模型 双环控制 

分 类 号：TN624[电子电信—电路与系统]