摘要
LLC谐振变换器因其较高的效率和功率密度,在电动汽车充电领域得到广泛应用。然而电池电压电流在充电过程中宽广的变化范围增加了LLC谐振型充电机参数优化设计的复杂度。本文分析了电池电压电流在充电过程中的变化特性,提出了一种以励磁电感最大为优化目标的LLC谐振变换器参数优化设计方法。首先基于基波近似(FHA)模型在考虑极端工况约束下获取了参数设计初值,然后在变换器精确数学模型基础上借助数值分析方法对参数初值进行优化,克服了基波近似无法精确描述变换器增益特性的缺点。最后设计制造了一台输入电压220VAC,输出电压50V-100VDC,输出电流0-30A的3kW原理样机,最高效率可达94.5%,实验结果证实所提参数优化设计方法的正确性与可行性。
LLC resonant converter has been widely applied for battery charging of electric vehicle for its high efficiency and power density.However,the wide output voltage ranges during battery charging make it more difficult to design the parameters of LLC resonant converter.This paper analyzes the characteristics of the battery voltage and current during the charging process.Then an optimal design method for resonant tank parameters of LLC resonant converter is proposed aiming at maximizing the magnetic inductor.The initial design parameters are derived at first based on the fundamental approximation(FHA)model considering the constraints of extreme conditions.Then the numerical analysis method is used to optimize the initial parameters based on the accurate mathematical model of LLC converter,which restrains the prediction errors of FHA model.Finally,a 3kW LLC resonant converter is built with input 220VAC,output 50-100VDC and 0-30A,to validate the effectiveness of the proposed optimal design method,which can achieves a high efficiency of 94.5%.
作者
陈建民
方支剑
蔡涛
Chen Jianmin;Fang Zhijian;Cai Tao(China Ship Development and Design Center,Wuhan 430064,China;School of Automation,China University of Geosciences,Wuhan 430074;School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《船电技术》
2019年第A01期66-74,共9页
Marine Electric & Electronic Engineering
关键词
LLC谐振变换器
充电机
参数设计
数值分析
LLC resonant converter
battery charger
parameters design
numerical analysis
