摘要
光伏逆变器辅助电源中的反激式变压器由于开关元器件的高频动作导致变压器在高频信号下出现了寄生电容。首先对反激变压器绕组进行建模,分析得到不同层之间的绕组均会形成寄生电容且当绕组间距离增加时,寄生电容增大,反之寄生电容减小。然后根据反激变压器的等效电路模型分析得到EMI差模、共模干扰源、传导路径及相应的电流表达式。最后通过试验分析得到差模干扰是传导干扰的主要组成部分而共模干扰是辐射干扰的主要组成部分。
Parasitic capacitance appears in the fly-back transformer of the auxiliary power supply of the photovoltaic inverter in the case of high-frequency signal due to high-frequency operation of the switching elements.Firstly,this paper established a model for windings of the fly-back transformer,and analysis revealed that windings between different layers would generate parasitic capacitance,which would rise with increasing distance between the windings and vice versa.Then,analysis of the equivalent circuit model of the fly-back transformer revealed the interference sources of the EMI mode and common mode as well as their conductive pathways and current expressions.Finally,experimental analysis indicated that difference mode interference was the main component of conductive interference while common mode interference was the main component of radiated interference.
作者
路染妮
王钰洁
孙红雨
Lu Ranni;Wang Yujie;Sun Hongyu(Xi’an Aeronautical Polytechnic Institute,Xi’an Shaanxi 710089,China;College of Electrical Engineering,Xi’an Jiao Tong University,Xi’an Shaanxi 710049,China;Northwest China Investigation and Design Institute Co.,Ltd.,Xi’an Shaanxi 710065,China)
出处
《电气自动化》
2019年第5期19-22,共4页
Electrical Automation
关键词
光伏
电源
反激
EMI
差模
共模
photovoltaic
power supply
fly-back
EMI
differential mode
common mode
