Iron Loss Calculation Method of Filter Inductor Core on a Single-Phase PWM Voltage Source Inverter
Iron Loss Calculation Method of Filter Inductor Core on a Single-Phase PWM Voltage Source Inverter
复制标题
单相PWM电压源逆变器滤波电感铁芯铁损计算方法
DOI：
10.1541/ieejias.127.217
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
K. Ishii
中科院分区：
文献类型：
--
作者：
S. Iyasu;Toshihisa Shimizu;K. Ishii
为了提高功率变换器的变换效率和功率密度，研究降低磁元件损耗的方法是电力电子领域的重要课题之一。传统上，降低变压器和交流电动机的磁化损耗的方法一直在研究。然而，只有少数文献报道了高频PWM开关条件下使用的AC/DC滤波电感的电感铁损。在这种情况下，BH平面上的磁轨迹具有两种磁环。一个是由低频电流引起的，这取决于输出电流，另一个是由高频涟漪电流引起的，这取决于逆变器的调制条件。本文将前一个磁回路称为主回路，后一个磁回路称为动态副回路。此外，众所周知，磁工作点和动态小回路的形状根据低频电流的瞬时幅度而改变。特别是在开关频率远高于输出频率的情况下，动态小回路（高频涟漪电流）引起的损耗通常占电感铁损的主导地位。因此，电感器上的损耗计算通常比变压器上的损耗计算复杂。作者报道了一种新的磁性材料损耗图，如图1所示。利用该损耗图，可以计算各种变流器电感上的铁损。在我们计算DC-DC转换器上电感器上的铁损的情况下，将损耗图上的数据乘以开关频率和磁芯体积就足够了。在此基础上，提出了一种利用损耗图计算PWM逆变器交流滤波电感铁损的新方法。该方法利用损耗图和简单的电路仿真计算动态小回路引起的铁损。讨论了PWM逆变器的控制方法与铁耗的关系。通过500 W的实验装置验证了该方法的有效性。图3示出了实验结果和计算结果引起的铁损的比较。计算结果与实验结果吻合较好。Fig. 1.磁性材料的损耗图（SK磁芯）
In order to increase both the conversion efficiency and the power density of the power converters, a study on the loss reduction method on the magnetic component is one of the most important issue among the power electronics authorities. Traditionally, reduction methods of the magnetizing loss of the transformers and the ac motors have been studied. However, only a few papers have been reported the inductor iron loss of the ac/dc filter inductor under the use of the high-frequency PWM switching condition. In this case, the magnetic trajectory on the BH-plane has two kind of the magnetic loops. The one is caused by the low-frequency current which depends on the output current and another is caused by the highfrequency ripple current which depends on the modulation condition of the inverter. In this paper, the former magnetic loop is called a major loop and the later magnetic loop is called a dynamic minor loop. Also, it is well known that the magnetic operating point and the shape of dynamic minor loop are changed according to the instantaneous amplitude of the low-frequency current. Especially, in the case when the switching frequency is much higher than the output frequency, the loss caused by dynamic minor loops (the highfrequency ripple current) usually dominate the iron loss of the inductor. Hence the loss calculation on the inductors are usually complicated compared to that on the transformers. The authors have reported a novel loss map of magnetic materials as shown in Fig. 1. By using this loss map, we can calculate the iron loss on the inductors in many kinds of converters. In the case when we calculate the iron loss on the inductor on DC-DC converters, it is enough to multiply the data on the loss map the switching frequency and the volume of the core. Furthermore, we have proposed a novel iron loss calculation method of the ac filter inductor on the PWM inverter by using the loss map. This method enables to calculate the iron loss caused by the dynamic minor loops by using the loss map and executing the easy circuit-simulation. The relation between the control method for the PWM inverter and the iron loss is discussed. The effectiveness of this method is verified through 500 W experimental set-up. Fig. 3 shows the comparison of the iron loss caused of the experimental results and the calculation results. It is clear that the calculation results are good agreement with the experimental results. Fig. 1. Loss map of the magnetic material (SK-core)