共模电感及原理应用

WürthElektronikeiSos©2009WÜRTHELEKTRONIKEISOSGMBH&CO.KG伍尔特电子有限公司(Eisos)2009CURRENTCOMPENSATEDCHOKES-SELECTION&APPLICATIONS–-电流补偿扼流选型和应用WürthElektronikeiSos©2009Whycurrentcompensated?为何要电流补偿?•economicadvantagesmoreexpensivethanSMDferriteeasytomakemoreturnover•经济优势比贴片铁氧体价格高更简单的制作工艺•technicaladvantagesbetterefficiencyhighcurrentwithhighinductancevalueonlysolutionforsomehighspeedsignal(USB,CAN…..)•技术优势提高效率大电流和高感值唯一的一些高速信号解决方案例如：(USB,CAN…..)•currentcompensatedchoke=commonmodechoke–WHY?•电流补偿扼流=共模扼流–为什么呢?WürthElektronikeiSos©2009reductionofinterferences•outwardsyourdevice•inwardsyourdevice•减少干扰•外部设备•内部设备result:•„no“orlowinfluencingofusedsignal•highattenuationofinterferencesdifferentialmodecommonmodeEMV-AllgemeinGrundlagenFilter&SignaleEinfügedämpfungFiltertopologienSimulationWhycurrentcompensated?为何要电流补偿?结果:•没有或者对有用信号的干扰很小差模•阻止衰减共模WürthElektronikeiSos©2009CommonModeChoke共模滤波器1101001000100001101001000f/MHzImpedanz/Ωnoise(commonmode)共模噪声usedsignal(differentialmode)有用信号(差模differentialmodeimpedan差模阻抗commonmodeimpedance共模阻抗•bestsolutiontofilternoiseclosetosignalfrequency•最好的方案过滤噪声接近信号频率WürthElektronikeiSos©2009CommonModeChoke共模滤波器•incomparisontosingle-choke相较于单扼流圈currentcompensatedorcommonmodechoke电流补偿或者说共模线圈singlechoke单扼流圈commonmodeimpedance共模阻抗High高lowtomedium低到中等differentialmodeimpedance差模阻抗Low低medium中等dependencyofimpedancefromloadcurrent阻抗依赖于负载电流Independent独立dependson„core“依靠，磁芯attenuationofusedsignal有用信号的衰减Low低High高WürthElektronikeiSos©2009CommonModeChoke共模扼流圈•Measurement测量1101001000100001101001000f/MHzImpedanz阻抗/Ωdifferentialmodeimpedance差模阻抗commonmodeimpedance共模阻抗WürthElektronikeiSos©2009CommonModeChoke共模扼流圈•differentdesigns不同的设计bifilar双绞线式sectional分段绕组LS~0,5…2%*LRLS~0,01…0,1%*LRWürthElektronikeiSos©2009CommonModeChoke共模扼流圈•differentdesigns•不同设计WE-SL2744226bifilarwinding双线绕组WE-SL2744226Ssectionalwinding分段绕组ImpedanceSL2:744226/S1101001000100001101001000Frequency[MHz]Impedance[Ohm]comm.bifilardiff.bifilarcomm.sectionaldiff.sectionalWürthElektronikeiSos©2009CommonModeChoke共模扼流圈分段绕组•Whendoweofferasectionalwinding•?什么时候我们提供下面的共模线圈?Sectional分段绕组onlysolutiontoguaranteedistancesbetweenthetwowindingaccordingtoIEC60938orUL1283max.voltageapplication:250VAC/DChighleakageinductor提供方案保证量绕组的距离，是依据IEC60938orUL1283应用最大电压:250VAC/DC高漏电感•powersupply:highvoltageapplication•signal:lowandhighspeedsignal•电源:应用高压•信号:低高速信号CMchokeDMchoketwoproductsinone(preferredforpowersupplies)2合一产品(适用于电源)max.voltage:printindatasheet最大电压:参考数据表WürthElektronikeiSos©2009CommonModeChoke共模扼流圈•datasignalapplication应用在数据信号Bifilar双绞线lowleakageinductor低漏电感•powersupply:lowvoltageapplication•signal:onlylowspeedsignal•电源:应用于低压•信号:仅应用于低速信号lowvoltageapplication(42VAC/80VDC)lowvoltageapplication(42VAC/80VDC)应用于低压(42VAC/80VDC)WürthElektronikeiSos©2009CommonModeChoke–Mainadvantages共模扼流圈–主要优点WE-LFWE-CMBWE-FCWE-CMBNiZn•bigrangeofsizestoXrefourcompetitor•大范围的尺寸代替我们竞争对手•SVcaseisverycompetitive产品有很大竞争优势•highcurrent-upto35A大电流可达到35A•lesscompetitorwiththispackage较少的竞争对手有这样的封装•highleakageinductance•highfrequencyattenuation高频衰减•highcurrent大电流WE-LF-SMD•dreamfordesigner•highVoltageSMD•highleakageinductance•高漏感WürthElektronikeiSos©2009CommonModeChoke共模扼流圈WE-FC:Internationalsize(Europe,Asia,US)国际尺寸(欧洲，亚洲，美国)+highestleakageinductance+极大的漏电感+smallsize+小尺寸+excellenthighfrequency高频+highvoltageburstperformance+高压工作-onlyforsmallcurrentsavailable-（紧应用于小电流）smallpowersupplies小功率WE-CMB:WE-CMBNiZn:smallsizeapplications用于小尺寸highcurrentapplications用于大电流motordriver马达驱动+specialsize+特殊的尺寸+productwithhighnominalcurrent产品要求的高额定电流+verysmallsize+很小的尺寸+onlyverticalversion仅有垂直型+specialsize+highfrequencyattenuation+attenuationofburst(IEC61000-4-4)+特殊尺寸+高频衰减+瞬间衰减(IEC61000-4-4)WürthElektronikeiSos©2009CommonModeChoke共模扼流圈WE-LF:Europeanstandardcomponent+Isolationtocomponentsaround+Mechanicalprotectionofthecore+easytoplace欧标元件+绝缘+机械保护磁芯+易存放generalindustrialapplicationspowersupplies一般用于工业电源WE-LFSMD:+specialsize+Isolationtocomponentsaround+mechanicalprotectionofwindingandcore+easytoplace+reflowsolderable+definedsolderpad+特殊的尺寸+绝缘+机械保护磁芯和绕组+易存放+可过回流焊+规范的焊盘smallpowersupplies(lineundloadfilter)lightingtechnologysmallsizeapplications小功率电源(线与负载滤波)照明技术用于小尺寸WürthElektronikeiSos©2009CommonModeChoke共模扼流圈•comparisondifferentpowerlinecommonmodechokes•比较不同功率的共模扼流圈0123456current[A]789101112WE-LF0,4mH47mH0,68mH47mH1,8mH47mH1,8mH27mHTypSTypMTypLTypXLWE-LFSMD0,7mH47mHTypSWE-FC0,82mH33mHTypS14µH100µHTypMWE-CMBNiZnWE-CMB1mH39mH1mH20mH1mH20mH1mH20mH1mH20mHTypXSTypSTypMTypLTypXL0,5mH1,8mH14-35ATypXXLWürthElektronikeiSos©2009CommonModeChoke共模扼流圈Insertionloss(commonmode)WE-CMBXS:MnZn=NiZn0102030405060700,11101001000frequency[MHz]attenuation[dB]14礖30礖47礖100礖1mH5mH10mH20mH39mH•comparisoncommonmodechokesCMB–CMBNiZn•CMB共模扼流圈的比较CMB–CMBNiZnCMBNiZnCMBWürthElektronikeiSos©2009CommonModeChoke共模扼流圈•comparisoncommonmodechokesCMB–LF–FC共模扼流圈比较CMB–LF–FCInsertionlossWE-FC,WE-LF,WE-CMB0102030405060708010100100010000Frequency[kHz]Attenuation[dB]FC:HorizontalFC:VerticalLF:27mHFC:22mH(Horrizontal)FC:22mH(Vertical)CMB:20mHWE-FCh