摘要
电力电子封装绝缘面临着高频率脉宽调制电压及高运行温度的双重考验,其劣化性能亟待深入研究。该文通过电树枝老化和理化分析试验等手段,探究高温高频方波脉冲作用下环氧树脂的电树枝生长特性。结果表明,随着频率的升高,电树枝生长速率并非单调上升,这主要与树枝通道是否碳化及空间电荷相关。不同温度和频率耦合作用下环氧树脂电树枝生长机制有显著差异。低频下,随温度升高,电树枝形态由树枝状转变为丛状,电树枝生长速率明显下降;而在中高频下,其生长速率显著提升,并在高温-高频耦合作用下产生大面积气泡状碳化区域。结果可为高频高温下电力电子封装绝缘设计和状态评价奠定一定理论基础。
The packaging insulation of power electronics faces the dual challenges of high-frequency pulse width modulation voltage and high operating temperature,and its degradation performance urgently needs further research.This article investigates the electrical tree growth characteristics of epoxy resin under the action of high-temperature and high-frequency square wave pulses through methods such as electrical tree aging and physicochemical analysis experiments.The results indicate that as the frequency increases,the growth rate of electrical tree does not increase monotonically,primarily due to the influence of tree channel carbonization and space charge effects.There are significant differences in the growth mechanism of the epoxy resin electrical tree under different temperature and frequency coupling effects.At low frequencies,as the temperature increases,the morphology of the electrical tree changes from dendritic to clustered,and the growth rate of the electrical tree significantly decreases.At medium and high frequencies,its growth rate significantly increases,and under the coupling effect of high temperature and high frequency,a large region of bubble-like carbonization area is generated.The relevant work lays a theoretical foundation for the insulation design and condition evaluation of power electronic packaging under high-frequency and high-temperature conditions.
作者
张云霄
林温馨
周远翔
刘育豪
黄婉莹
ZHANG Yunxiao;LIN Wenxin;ZHOU Yuanxiang;LIU Yuhao;HUANG Wanying(Fujian Key Laboratory of New Energy Generation and Power Conversion(College of Electrical Engineering and Automation,Fuzhou University),Fuzhou 350108,Fujian Province,China;State Key Laboratory of Power System Operation and Control for New Energy Systems(Department of Electrical Engineering,Tsinghua University),Haidian District,Beijing 100084,China)
出处
《中国电机工程学报》
北大核心
2025年第14期5710-5722,I0033,共14页
PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING
基金
国家自然科学基金项目(92266110)
福建省自然科学基金项目(2022J01112)
新型电力系统运行与控制全国重点实验室项目(SKLD22KZ10)。
关键词
温频耦合
方波脉冲
环氧树脂
电树枝
碳化
temperature-frequency coupling
square wave pulse
epoxy resin
electrical tree
carbonization
