电感电压部分补偿交流功率法测量磁心损耗研究

磁性元件作为功率变换器的重要组成部分，其磁心损耗的精确测量对磁性元件的优化具有重要意义。为了提高传统双绕组交流功率法测量高频激磁磁心损耗的测量精度，本文详细分析电感电压补偿交流功率法的测量原理及其误差来源，基于电感电压补偿交流功率法在非完全补偿的情况下测量高阻抗角磁性元件磁心损耗时误差仍很大的问题，本文提出了电感电压部分补偿交流功率法精确测量任意波形激励下的磁性元件磁心损耗。最后建立测量平台，在非完全补偿条件下，该方法测量50 kHz正弦波激磁的金属磁粉芯磁心损耗的最大相对误差为13.54%,50 kHz矩形波激磁的金属磁粉芯磁心损耗的最大相对误差为9.8%,实验验证该方法可精确测量正弦波激磁和方波激磁的高阻抗角金属磁粉芯的磁心损耗。

Research on measuring magnetic core loss by the inductor voltage partial compensation AC power method

Magnetic components are important parts of power converters. The accurate core loss measurement is very important for the optimization of magnetic components. To improve the measurement accuracy of the traditional dual-winding AC power method for core loss measurement with high-frequency excitation, the measurement principle and error source of the inductor voltage compensation AC power method are analyzed in detail. Based on the error problem that the core loss of magnetic components with high impedance angle is measured with the inductor voltage compensated AC power method under incomplete compensation, the inductor voltage partially compensated AC power method is proposed to accurately measure the core loss under arbitrary waveform excitation in this article. Finally, the measurement platform is established under the condition of incomplete compensation. The maximum relative error of this method for core loss measurement of the powder core with 50 kHz sine wave excitation is 13. 54% , and the maximum relative error of core loss measurement of the powder core with 50 kHz rectangular wave excitation is 9. 8% . Experimental results show that the core loss of magnetic powder core under sine wave and square wave excitation can be accurately measured by the proposed method.