一种基于简化时域方程的LLC谐振变换器参数设计方法  

Parameter design method of LLC resonant converter based on simplified time-domain equations

作　　者：牛靖凯 吴学智[1] 赵宇明 荆龙[1] 童亦斌[1] 辛晓敏 NIU Jingkai;WU Xuezhi;ZHAO Yuming;JING Long;TONG Yibin;XIN Xiaomin(School of Electrical Engineering,Beijing Jiaotong University,Beijing 100044,China;Shenzhen Power Supply Bureau Co.,Ltd.,Shenzhen 518020,China)

机构地区：[1]北京交通大学电气工程学院,北京100044 [2]深圳供电局有限公司,广东深圳518020

出　　处：《电力自动化设备》2022年第6期103-110,共8页Electric Power Automation Equipment

基　　金：中国南方电网有限责任公司科技项目(090000KK52180116)。

摘　　要：LLC谐振变换器中的谐振元件参数会影响变换器的增益、损耗、体积等主要特性,而目前大多关于谐振参数的优化设计方法存在精度不高、算法复杂等不足。对此,基于简化时域方程对重载下LLC谐振变换器开关频率小于谐振频率的工况进行了分析,指出影响增益的主要因素为电感系数。同时,以谐振阻抗作为关键变量,基于时域分析对软开关过程以及谐振电容电压峰值进行了分析,并给出了相关的约束方程。在以上分析的基础上,提出了一种谐振参数优选值的设计方法,具有准确、简单、快速的优点。最后利用仿真及实验对该设计方法进行了验证。The parameters of resonant elements in LLC resonant converter are the main factors affecting the gain,loss,volume of the converter,etc.However,most of the optimal design methods for resonant parameters have some shortcomings,such as low precision and complex algorithm.Based on the simplified time-domain equations,the operating conditions of switching frequency less than resonant frequency with heavy load are analyzed,and it is pointed out that the main factor affecting the gain is the inductance coefficient.At the same time,taking the resonant impedance as the key variable,the soft switching process and the peak voltage of the resonant capacitor are analyzed in time domain,and the relevant constraints are given.On the basis of the above analysis,an accurate,simple and fast design method to obtain the optimal value of resonance parameters is proposed.Finally,the proposed design method is verified by simulation and experiment.

关 键 词：LLC谐振变换器 谐振参数 简化时域方程 谐振电容电压峰值 参数设计 

分 类 号：TM46[电气工程—电器]