A Study on Calculation and Mitigation of Minor Hysteresis Loss of Magnetic Materials on Inductors, and High-Efficiency Utility Interactive Inverters utilizing Low Loss Inductors

本研究针对PWM逆变器高频开关动作所造成的电感磁芯微小磁滞损耗进行了研究，并提出了一种新的损耗计算方法。本研究的主要成果如下：1）电感磁芯微滞环损耗精确测量方法的开发：在功率变换器的设计过程中，准确的损耗预测和计算是最重要的问题之一。功率半导体器件的损耗计算方法已被研究，并提出了许多有用的方法。在集中，精确和有效的损失计算电感器上使用的直流斩波电路和交流逆变器电路没有得到很好的研究。其主要原因是难以把握磁体的非线性现象 ...更多信息 感应器上的材料。本研究的重点是准确测量的磁滞损耗的磁性材料，动态变化，根据工作条件的功率转换器。研究了斩波电感动态小磁滞回线的测量方法。并成功开发了基于B-H分析仪的精密测量方法。在此基础上，提出了一种新的损耗表达方法，即损耗图，它可以计算斩波电路中任意情况下的电感损耗。2）PWM逆变器交流滤波电感铁损计算方法的改进研究了PWM逆变器电路中交流滤波电感铁损的计算方法。PWM逆变器中交流滤波电感的动态滞环轨迹与直流斩波电路中交流滤波电感的动态滞环轨迹具有不同的特性。B-H平面上的轨迹的最关键的特征是由调制信号引起的轨迹不形成闭合形状，因此难以计算每个开关周期中的铁损。在这项研究中，研究人员开发了一种准闭环概念，可以预测每个开关周期的铁损。通过使用这种方法，研究人员已经表明，铁损的损耗分布的差异是完全不同的PWM调制方法。该结果清楚地证实了电感器上的损耗因调制方法而异的原因。少

In this research, minor-hysteresis-loss on the inductor magnetic core which is caused by the high-frequency switching action of the PWM inverters has been studied and also a novel loss calculation method is invented. Also, effective design method in which accurate loss estimation taking in to account is proposed by utilizing the novel calculation method Major achievements on this research are as follows,1) Development of Precise Measuring Method of Minor-Hysteresis Loss on the Inductor Core :On the design process of power converters, accurate loss prediction and calculation are one of the most important issues. The loss calculation method on the power semiconductors has been studied and many useful methods have already been proposed. On the centrally, precise and effective loss calculations of the inductors used on the dc chopper circuit and ac inverter circuit did not have been studied well. The main reason for that is difficulty of grasping the nonlinear phenomenon of the magnetic ma … More terials on the inductor. This study focused on the accurate measurement of magnetic hysteresis loss on the magnetic materials which dynamically changes according to the operation condition on the power converters. The researchers have been studied the measuring method of dynamic minor-hysteresis loop on the chopper inductor. And, accurate measuring method based on the B-H analyzer is successfully developed. Based on the measured results, a novel loss expression method, which we call it "Loss map", is also proposed which enables to calculate the inductor core loss at arbitrary condition of the chopper circuit is invented. This result confirms the experimental results very well.2) Development of Iron Loss calculation of ac Filter Inductor on the PWM Inverter.Iron loss of ac filter inductor of which operates in the PWM inverter circuit is developed. The dynamic hysteresis locus of the ac filter inductor on the PWM inverter has different characteristics compared to that on the dc chopper circuit. The most crucial feature of the locus on the B-H plane is that the locus caused by the modulation signal does not form a closed shape, and hence it is difficult to calculate the iron loss in each switching period. In this study, the researchers have developed a quasi closed loop concept which enables to predict the iron loss on each switching periods. By using this method, researchers have showed that the difference of loss distribution of the iron loss is completely different depending upon the PWM modulation method. This result clearly confirms why the loss on the inductor is different depending on the modulation methods. Less