无线充的EMC辐射问题分享

时间： 2024-08-22 来源：韬略科技EMC公众号

技术问答

一、前言

随着用电设备对供电质量、安全性、可靠性、方便性、即时性、特殊场合、特殊地理环境等要求的不断提高，使得接触式电能传输方式越来越不能满足实际需要。

无线技术的发展，使得无线电功率的传输成为可能，无线充电器的研究与开发也将实现用户的要求。

二、原理分析

无线充的工作原理和变压器的工作原理很类似，充电器通电后，产生一个交变电流，交变电流使无线充内部的发射线圈产生一个交变磁场，当手机或者其它需要充电设备靠近这个交变磁场时，充电设备的接收线圈会感受到磁场，并且将电磁能量转化为电能，进行充电，前提条件是充电设备必须有接收线圈。

三、实际案例分享

下图为某个无线充在无线充电15W正常工作时的垂直方向和水平方向的测试数据。我们可以看到的是两个方向测试的结果差异不大，都是在30MHz~200MHz之间有一些包络超标。

通过噪声超标的频段推测噪声源头是主板的DCDC噪声和MOS管开关噪声，通过电源线束传输增强导致噪声超标。

根据推测，我们可以通过对噪声源头以及噪声路径进行整改，从而降低噪声。

1.在噪声源头DCDC的SW脚靠近芯片端接入RC吸收电路10Ω2.2nf；

2.MOS管产生噪声的原因是当MOSFET关断时，其DS之间的电压从0上升到Vds(off)，因此有很大的dV/dt，我们可以通过增大MOS管的驱动电阻来增长MOS管的关断时间，在开关时刻电压电流交叠时间就越大，造成的开关损耗就越大，从而达到dV/dt下降的结果。MOS管的驱动电阻有一个选取范围，通常是5Ω~100Ω之间，在这里我们将5Ω调成10Ω。

如上图所示，RL为驱动电阻位置，右边为方波输出

3.针对电源线束引出的噪声增强问题，在电源输入的正极和负极绕一个磁环，发现噪声有明显的改善，把磁环换成我们公司的大电流共模滤波器，根据封装和电流要求，所以选择了TLDCM7035-2-701TF的大电流共模滤波器。根据单极天线骚扰源公式：

E=12.6*10^-7fIL/r

E：电场强度（V/m）
f：电流的频率（MHz）
L：电缆的长度（m）
I：电流的强度（mA）
r：测试点到电流环路的距离（m)

我们通过减小噪声输出的天线长度来降低噪声。

在将共模电感设计进电路的时候，我们需要注意共模电感下的地层需要掏空，滤波电路的输入、输出之间要做好隔离，共模电感才能达到很好的滤波作用。（具体可以参考上图设计L3）。

如上图所示，我们可以看到在30MHz~200MHz之间有一些包络超标都有了明显的改善。

在PCB板设计时，我们可以根据环形天线骚扰源公式：

E=263*10-16f^2AI/r

E：辐射强度(V/m)
f：电流的频率(MHz)
A：电流的环路面积(cm²)
I：电流的强度(mA)
r：测试点到电流环路的距离(m)

对PCB板设计优化来减小噪声回路面积从而达到降低噪声的目的，在设计电路时，我们尽可能的将电容和电感往DCDC芯片靠近。我们还可以在PCB板背面覆铜到地，这样会有更好地散热和也能降低噪声，最好使用多层板。

四、总结

无线充是最近几年才开始流行并且广泛使用的，所以关于无线充的其它一些EMC问题还是比较少遇到，当我们遇到这些问题时，依然是遵从干扰源——耦合路径——干扰敏感源这三方面去分析并且解决问题。

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本文由ll转载自韬略科技EMC公众号，原文标题为:无线充的EMC辐射问题分享，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。

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目录- 公司简介和产品介绍产品型号规格及代码定义车规MLCC产品范围车规MLCC-C0G系列车规MLCC-X7R系列车规MLCC-X7S系列车规MLCC-X7T系列应用技术要求

型号- A360J0201C0G500NA,A271F0805C0G101NK,A271J0805C0G101NK,A392M0402X7R250NB,A331G0805C0G251NK,A1R2A0402C0G250NB,A100G0603C0G101ND,A0R5B0603C0G101ND,A821M0402X7R160NB,A471K0201X7R100NA,A471M0201X7R100NA,A392K0402X7R250NB,A821K0402X7R160NB,A1R8B0201C0G250NA,A3R0A0603C0G500ND,A272K0603X7R101ND,A272K0402X7R160NB,A226M1210X7S250N3,A272M0402X7R160NB,A102J1206C0G631N1,A105M0805X7S101NH,A102F1206C0G631N1,A103G1206C0G631N1,A2R7A0603C0G101ND,A2R7C0603C0G101ND,A8R2C0201C0G500NA,A1R5B0402C0G500NB,A105K0805X7S101NH,A102M0201X7R100NA,A225K0805X7R250N5,A226K1210X7S250N3,A473K0603X7R101ND,A3R0C0603C0G500ND,A102K0201X7R100NA,A225M0805X7R250N5,A122G0603C0G101ND,A180G0201C0G500NA,A180G0201C0G250NA,A683J1206C0G500N1,A5R6C0402C0G250NB,A0R6A0603C0G101ND,A332J0805C0G251NH,A561K0402X7R250NB,A104M0402X7R160NB,A227M1210X7T2R5N3,A683F1206C0G500N1,A562F1210C0G631NO,A3R6B0402C0G500NB,A1R3B0402C0G250NB,A153K0402X7R100NB,A104M0603X7R101ND,A562J1210C0G631NO,A101F0603C0G101ND,A103F1206C0G500NE,A153M0402X7R100NB,A472G1206C0G631N1,A104K0603X7R101ND,A332F0805C0G251NH,A105K0805X7R160N5,A221F0402C0G250NB,A240F0603C0G500ND,A153G1206C0G101NE,A105M0805X7R160N5,A6R0B0201C0G500NA,A6R0B0201C0G250NA,A9R0C0603C0G101ND,A103J0805C0G101NH,A332K0402X7R100NB,A6R2D0201C0G500NA,A221J0402C0G250NB,A7R5B0603C0G500ND,A7R5D0603C0G500ND,A240J0603C0G500ND,A183G1210C0G631NP,A6R0D0201C0G500NA,A222G1206C0G251NO,A332M0402X7R100NB,A563M0402X7R500NB,A8R0C0201C0G250NA,A1R1B0402C0G250NB,A151J0805C0G251NK,A103J1206C0G500NE,A8R2C0201C0G250NA,A561M0402X7R500NB,A103F0805C0G101NH,A563K0402X7R500NB,A104K0402X7R160NB,A151F0805C0G251NK,A561K0402X7R500NB,A121F0603C0G101ND,A123F1206C0G500NE,A360J0201C0G250NA,A392M0402X7R500NB,A1R0B0603C0G500ND,A121J0603C0G101ND,A123J1206C0G500NE,A223G0805C0G500N5,A392K0402X7R500NB,A823K0603X7R101ND,A182M0201X7R250NA,A823K0402X7R160NB,A272J0603C0G500ND,A102G0603C0G101ND,A471G0805C0G101NK,A823M0402X7R160NB,A333F1206C0G101NE,A6R0D0201C0G250NA,A104G1206C0G500N1,A152M0201X7R250NA,A681F0603C0G101ND,A681J0603C0G101ND,A152K0201X7R250NA,A221M0402X7R101NB,A1R6A0402C0G500NB,A272F0603C0G500ND,A333J1206C0G101NE,A221M0201X7R160NA,A223M0603X7R500ND,A3R3B0603C0G500ND,A8R0C0201C0G500NA,A471M0402X7R160NB,A1R2A0402C0G500NB,A1R2C0402C0G500NB,A1R3B0402C0G500NB,A101J0603C0G101ND,A360F0201C0G250NA,A1R6C0402C0G500NB,A223K0603X7R500ND,A823K0805X7R101N5,A471G0603C0G101ND,A221K0402X7R101NB,A823M0805X7R101N5,A272G0805C0G101NK,A471K0402X7R160NB,A390G0402C0G250NB,A472J0805C0G101NH,A221K0201X7R160NA,A682K0201X7R100NA,A8R0B0402C0G500NB,A8R0D0402C0G500NB,A5R0B0603C0G500ND,A682M0201X7R100NA,A560G0201C0G250NA,A220G0402C0G250NB,A820G0603C0G500ND,A271G1206C0G631NK,A123K0402X7R100NB,A122K0201X7R100NA,A101G0805C0G201ND,A472F0805C0G101NH,A182K0201X7R250NA,A123M0402X7R100NB,A1R0A0402C0G250NB,A272K0201X7R100NA,A1R0C0402C0G250NB,A471F1206C0G631NK,A471J1206C0G631NK,A152G0805C0G251NK,A272M0201X7R100NA,A102G0805C0G101NK,A122M0201X7R100NA,A4R0A0201C0G250NA,A683K0402X7R100NB,A0R9A0603C0G500ND,A562K0201X7R250NA,A6R8B0603C0G101ND,A1R2B0603C0G500ND,A561G1206C0G251NK,A1R6C0402C0G250NB,A3R3A0402C0G500NB,A222K0402X7R250NB,A240G0402C0G250NB,A270G0603C0G101ND,A2R0B0201C0G500NA,A1R5A0201C0G250NA,A330F0201C0G500NA,A682F1206C0G631N1,A3R0B0402C0G250NB,A182G0805C0G251NK,A1R8C0402C0G500NB,A183G1206C0G101NE,A563M0402X7R250NB,A330J0201C0G500NA,A1R0C0402C0G500NB,A3R9A0402C0G250NB,A106M0603X7T6R3NK,A472G0603C0G500ND,A2R4B0603C0G101ND,A120G0603C0G101ND,A273J1206C0G500NE,A102M0402X7R160NB,A821M0201X7R100NA,A391K0402X7R101NB,A822K0201X7R160NA,A102M0603X7R101ND,A473G1206C0G500N1,A1R5B0402C0G250NB,A682J1206C0G631N1,A273F1206C0G500NE,A822K0603X7R250ND,A391K0201X7R160NA,A1R5A0201C0G500NA,A101J0805C0G101ND,A820F0603C0G101ND,A6R2B0201C0G250NA,A104M0805X7R101N5,A820J0603C0G101ND,A106M0805X7S250NH,A7R0B0603C0G101ND,A101F0805C0G101ND,A682G0805C0G251NH,A223M0603X7R250ND,A183K0402X7R100NB,A4R0C0201C0G500NA,A822G0805C0G500N5,A361F1206C0G251NK,A681M0402X7R100NB,A5R1B0603C0G101ND,X7T系列,A222J0603C0G500ND,A122M0603X7R101ND,A431K0201X7R100NA,A0R7B0603C0G101ND,A5R1C0603C0G500ND,A682K0402X7R160NB,A221J1206C0G251NK,A6R2B0201C0G500NA,A360G0402C0G500NB,A220G0402C0G500NB,A391J1206C0G251NK,A4R3B0603C0G101ND,A471J0603C0G500ND,A271K0201X7R160NA,A3R3C0402C0G250NB,A271K0402X7R101NB,A273K0603X7R500ND,A105M0603X7R250ND,A1R6B0201C0G250NA,A122M0402X7R160NB,A152G0603C0G101ND,A152F1210C0G631NK,A474M0603X7R160ND,A153G1210C0G631NP,A471F0603C0G500ND,A152J1210C0G631NK,A682K0603X7R101ND,A222F0603C0G500ND,A391F1206C0G251NK,A683M0603X7R160ND,A4R3B0201C0G250NA,A5R6B0603C0G500ND,A1R1A0603C0G500ND,A3R6C0201C0G250NA,A183M0402X7R500NB,A1R5C0603C0G500ND,A180F0402C0G500NB,A222G1210C0G631NO,A5R6D0201C0G250NA,A8R2D0402C0G500NB,A3R6A0603C0G500ND,A272M0603X7R101ND,A1R1C0201C0G250NA,A473K0402X7R160NB,A681J0805C0G251NK,A182F1210C0G631NK,A1R8B0201C0G500NA,A474K0805X7S101NH,A821G0603C0G101ND,A475M0603X7T6R3NK,A182J1210C0G631NK,A473M0805X7R101N5,A106K0805X7T6R3NH,A240G0402C0G500NB,A8R0D0402C0G250NB,A331M0201X7R250NA,A560G0201C0G500NA,A6R2C0402C0G500NB,A390G0402C0G500NB,A221F120

选型指南 - 微容科技 - 2022版 - 2022/7/27 PDF 中文下载