【2017年整理】EMI滤波器的防护设计.ppt

EMI滤波器的防护设计; 滤波器;?? ? 电源线上既有mV级骚扰电压,也有数百,上千伏瞬态骚扰(其中,浪涌,电快速瞬变脉冲群占88.5%,电压跌落占11%,电压中断占0.5%),特别是对敏感设备,会造成直接影响.是45%计算机丢失数据和发生故障的主要原因. 电子设备含有CPU,开关电源,可控硅,变频调速,马达,继电器等时,也会对外界产生骚扰 ? ;;;;;;EMI电源滤波器插入损耗的计算方法 ; 如我们采用A参数表示滤波器网络，A参数矩阵为： 则 所以EMI滤波器插入损耗和插入衰减的定义不同不能 直接照搬,为此EMI滤波器的插入损耗需要重新推导。 ;低频差模插入损耗的推导;插入损耗的原理图;;;增加差模扼流圈后的效果;插入损耗的测量方法; 0.1Ω/100Ω及100 Ω/ 0.1Ω阻抗测量方法;?? ? ? Ly = 0.3 - 38 mH， Cy 0.1μF 漏电流 3.5 mA Lx = 几十-几百μH Cx 0.1 ?F ?;;;;;单电容型滤波器;;;插入损耗;;;电源线滤波器的特性;;国际耐压规范;泄漏电流与安全; ;;;; EMI滤波器的正确选择和使用;失配的对应电路;;;;;;正确的安装方法 ;;EMI滤波器设计使用实例;EMI滤波器设计使用实例;EMI滤波器设计使用实例;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.; ; ;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.; ;;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.;Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.;