基于老化补偿的功率模块全生命周期在线结温监测方法  

Full Life-Cycle Online Junction Temperature Monitoring of Power Module Based on Aging Compensation

作　　者：郑丹 宁圃奇[1] 仇志杰[1] 范涛[1] 温旭辉[1] Zheng Dan;Ning Puqi;Qiu Zhijie;Fan Tao;Wen Xuhui(Institute of Electrical Engineering Chinese Academy of Sciences,Beijing,100190,China)

机构地区：[1]中国科学院电工研究所,北京100190

出　　处：《电工技术学报》2024年第12期3705-3717,共13页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划资助项目(2021YFB2500600)。

摘　　要：功率模块结温在线监测对提升系统性能和可靠性具有重要意义。应用导通饱和压降和电流对结温进行估计,对测量带宽要求不高,对硬件和算法的侵入性低,是比较理想的结温在线监测方法。但是传统的测量方法很难满足结温精度要求,另外长期工作下功率模块老化会引起温度模型参数漂移,进一步加剧结温估计误差。为此,该文提出一套高精度测量电路和采样校准策略,应用温漂抑制、动态自适应采样、误差定向标定、同步时序控制等策略,大幅提高了在线采样分辨率和结温估计精度。针对老化问题,提出一种基于大电流注入的急停控制策略,解决了老化特征参数在线辨识问题,实现了结温模型的老化补偿,大大提高了老化后的结温监测精度,实现了全生命周期高精度在线监测。最后,在250kW三相变流器平台上进行了实验验证,得到老化前后的结温估计误差,证明了该文方法对提高结温监测精度具有明显效果。Online junction temperature(T_(J))monitoring of power modules is essential to improve system performance and reliability.T_(J) estimation method with on-state voltage(V_(CE))at high current(OVHC method)has the advantages of sampling bandwidth,control strategy invasion,and hardware integration.Nevertheless,higher requirements are still put forward for the on-state voltage and current online sampling accuracy to ensure T_(J) estimation precision.Due to the difficulty and cost of online measurement,T_(J) online monitoring is still in the theoretical research stage,and there are few high-precision engineering applications.Furthermore,most thermal sensitive electrical parameters(TSEPs)are affected by the degradation of power modules,which is a common challenge.Therefore,it is essential to measure and decouple the aging characteristic parameters.This paper introduces the T_(J) model,identification method,and online monitoring architecture of OVHC.Then,the high-precision measurement circuit and sampling strategy are proposed.The temperature resolution of V_(CE) can be increased by over 6 times using dynamically adjustable subtractors and multipliers to form a range adaption circuit,coupled with thermal matching of FRDs and harmonic suppression.To reuse the low precision current sensor of the converter,a current calibration method oriented to T_(J) accuracy is adopted to eliminate the system error of the sensor.Furthermore,the delay compensation in hardware and the synchronous oversampling strategy in software are proposed.High-quality sampling is realized through circuit design and strategy control without relying on advanced devices.The hardware cost and volume are very small,which creates conditions for practical application.The influence of aging on OVLC is mainly manifested in the increase of V_(CE) caused by bond wire shedding,which leads to the drift of T_(J) model.Therefore,the change of on-state impedance at 0℃(ΔR_(L,0))is derived to characterize the aging process of the module.A sudden-stop control strategy

关 键 词：结温在线监测 导通饱和压降 高精度测量 老化补偿 参数辨识 

分 类 号：TM46[电气工程—电器]