摘要
为了有效地评估和预测功率变换器中磁元件的磁芯损耗,将反映磁芯一个励磁周期内损耗的动态磁滞回线以椭圆回线等效,推导出了无直流偏磁工况下脉宽调制(pulse width modulation,PWM)波形励磁的磁芯损耗模型。采用差值损耗测量思想,以DC/AC逆变电路作为测试电路,测量了直流偏磁及PWM波励磁下的磁芯损耗。进一步根据直流偏磁下磁芯损耗的测量结果及其特征的分析,构思了以磁芯基本磁化曲线模型为基础的直流偏磁和PWM波励磁下的磁芯损耗模型。最后,对比了测试数据和所提出的模型的计算结果,验证了模型的正确性。
In order to evaluate and predict the core losses of magnetics in power converters, by equivalently replacing the dynamic B-H loop which surrounding area reflects the core losses in a magnetizing cycle period with an elliptical loop, the model of magnetics core losses under the PWM excitation without DC bias was derived. The core losses of magnetics under both DC bias and PWM excitations using a DC/AC inverter as the test circuit were measured by differential loss test idea. By the analysis of the core loss test results and their characteristics, a new core loss model considering the effects of both DC bias and PWM excitations was conceived based on the basic B-H curve. Finally, the test results were compared with the proposed model and the model accuracy was verified.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2015年第10期2601-2606,共6页
Proceedings of the CSEE
基金
国家自然科学基金项目(51277032)
福建省自然科学基金项目(2012D092)~~
