高频磁元件磁芯损耗的测量研究

发布时间：2018-05-11 06:20

本文选题：磁芯损耗 + 直流测量法　；参考：《福州大学》2014年硕士论文

【摘要】：磁性元件是功率变换器必不可少的部分,是功率变换器高功率密度和高效率的重要影响因素。磁芯损耗是磁性元件选取的重要依据,精确的磁芯损耗数据对设计者尤为重要。因此,针对磁芯损耗的测量方法的研究具有十分重要的意义。本文介绍了现有磁芯损耗的测量方法,分析了各个方法的特点和存在的不足,指出直流测量法可以有效克服传统交流功率计法测量高阻抗角的磁性元件时,电压和电流测量的相角偏差对测量误差的影响。并基于直流测量法设计了一台可以测量电力电子功率变换器各种脉宽调制波形激励下磁芯损耗的实验样机,通过DC/AC全桥逆变电路将直流输入转换为施加在被测磁性元件上的波形激励,通过测量输入直流功率间接得到磁芯的损耗值。本文采用基于TMS320F28022的DSP控制,能方便的产生多路PWM,并能调节死区时间；论文详述了硬件电路设计,分析了电路的损耗组成及计算公式；介绍了定标扣除装置电路损耗的方法；为能实时设置所需参数,读取状态数据,本文设计了上位机功能和界面。针对手动定标扣除电路损耗周期长,操作繁琐的问题,本文上位机中还设计了自动定标界面,通过设置相关参数,该界面能实时测量和保存数据。针对直流测量法实验样机,本文采用三个空芯电感定标,得出电路损耗计算公式,并通过另外两个空芯电感对定标精度予以验证。为验证样机装置测量磁元件损耗的测量精度,本文将装置测量结果与量热法测量的结果比较,文中介绍了量热法装置及其定标。实验结果表明装置测量结果与量热法测量比误差小于10%。有限元仿真磁芯损耗是一种有参考价值的磁芯损耗模型,本文分析了采用Ansoft Maxwell有限元仿真软件仿真磁芯损耗的原理,并采用Mathcad编译了模型公式,计算结果与Ansoft仿真结果一致。文中针对某一磁芯的磁芯损耗进行了Ansoft仿真及实验测量,并对测量结果做了分析。
[Abstract]:Magnetic element is an essential part of power converter, and it is an important factor of high power density and high efficiency of power converter. Core loss is an important basis for the selection of magnetic elements, and accurate core loss data is particularly important for designers. Therefore, the study of core loss measurement method is of great significance. This paper introduces the existing methods of core loss measurement, analyzes the characteristics and shortcomings of each method, and points out that DC measurement method can effectively overcome the traditional AC power meter method in measuring magnetic elements with high impedance angle. The effect of phase angle deviation of voltage and current measurement on measurement error. Based on the DC measurement method, an experimental prototype is designed to measure the core loss under the excitation of various pulse width modulation waveforms of power electronic power converters. The DC input is converted into the waveform excitation applied to the measured magnetic element by the DC/AC full-bridge inverter circuit. The loss value of the core is obtained indirectly by measuring the DC power input. DSP control based on TMS320F28022 is adopted in this paper, which can produce multi-channel PWMs conveniently and adjust dead-time. The paper describes the hardware circuit design, analyzes the circuit loss composition and calculation formula, and introduces the method of calibrating and deducting the circuit loss. In order to set the required parameters and read the state data in real time, the function and interface of upper computer are designed in this paper. In order to solve the problem of long loss period and complicated operation of manual calibration deduction circuit, an automatic calibration interface is designed in this paper. By setting relevant parameters, the interface can measure and save data in real time. Aiming at the experimental prototype of DC measurement method, this paper uses three hollow inductors to calibrate the circuit losses, and verifies the calibration accuracy by two other hollow inductors. In order to verify the measuring accuracy of the device for measuring the loss of magnetic elements, this paper compares the measuring results of the device with that of the calorimetric method. The calorimetric device and its calibration are introduced in this paper. The experimental results show that the ratio error between the measured results and the calorimetric method is less than 10. Finite element simulation core loss is a kind of core loss model with reference value. This paper analyzes the principle of using Ansoft Maxwell finite element simulation software to simulate core loss, and compiles the model formula with Mathcad. The calculated results are consistent with Ansoft simulation results. In this paper, the core loss of a magnetic core is simulated and measured by Ansoft, and the measured results are analyzed.
【学位授予单位】：福州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

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