The Role of EMI Filters in Power Electronics

时间： 2024-08-01 来源：Knowles Official Website

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MLCC,DC link capacitors,safety capacitors,EMI Filter

As power conversion systems evolve to leverage higher voltages and wide bandgap semiconductors like silicon carbide (SiC) and gallium nitride (GaN), system designers face new challenges in managing the electromagnetic interference (EMI) frequency landscape. Here’s how EMI Filters play an important role in ensuring safe operation at higher voltages.

The Role of EMI Filters in Power Electronics

EMI filters are designed to keep internally generated electrical noise from conducting across the system and negatively impacting operations elsewhere. In other words, they contain and manage noise. In power electronics, they take the form of power line filters that protect the line from upstream noise.

While the list may differ depending on system requirements, the core components of a power line filter include:

●A common-mode filter circuit with two or more line-to-chassis capacitors and a common-mode inductor

●A differential mode (DM) filter circuit with at least one pair of series inductors and one line-to-line capacitor

●Compensation networks to adjust the filter’s quality (Q) factor and adapt the output impedance as needed

●Transient voltage suppression device(s) to defend against surges

Figure 1 shows an EMI filter structure that could be useful for single-phase AC applications or DC power inputs.

Figure 1: EMI filter structure designed for single-phase AC applications or DC power inputs

L1, a common-mode choke, suppresses EMI and improves signal integrity. L1, C5, and C6 work together to manage second-order losses. C5 and C6 are commonly known as Y capacitors. L2 and L3 are the two inductors that form the differential-mode inductance. C1, C2, and C4, also known as X capacitors, are line-to-line capacitors for differential-mode loss. With common- and differential-mode losses and two RC shunt networks (R1, C3, and R2, C7), quality factor and output impedance are controllable.

Normal/Differential Mode vs. Common Mode

Differential-mode, or normal-mode, noise is a voltage differential that appears between the power line and a neutral or return line, where power naturally flows through an electric circuit. These currents travel in opposite directions on the circuit’s conductors. Normal-mode transients have a direct path through the circuit, so, naturally, they have an opportunity to degrade system performance.

Power supplies and motor controls that leverage high-frequency switching, like pulse width modulation (PWM) motor controls, are major differential-mode noise contributors. For example, with PWM controls, switching creates differential-mode noise at the source because of high ripple currents in DC link capacitors.

Alternatively, common-mode currents travel in the same direction on the circuit’s conductors, so they return on a separate path. This kind of noise is more common between ground and two normal-mode lines. Since this type of noise is more common on more lines, it’s cause for concern; analog and digital circuits are susceptible to poor function and failure. Common-mode noise tends to be higher frequency than differential-mode noise because it originates from capacitive coupling. Higher frequency leads to coupling between components and lines. More coupling, more common-node noise.

The Role of safety capacitors in EMI Filter Circuits for Power Electronics

X capacitors and Y capacitors, identified in the description of Figure 1, are designated safety capacitors. Since they’re exposed to hazardous voltages more than other components, certification ensures that they’ll operate efficiently and safely under more extreme conditions.

Class-X and Class-Y capacitors minimize EMI in different applications. Class-X, or “across-the-line” capacitors, are placed between wires carrying AC current to prevent shock in the event of failure. Class-Y capacitors, or “line-to-ground” capacitors, offer line-to-ground protection and are rigorously tested to minimize shock risk in the event of a ground failure. X1/Y1 safety capacitors combine both classes and can function appropriately regardless of where they’re placed in the circuit.

Depending on your application requirements, see Knowles MLCC Class-X and Class-Yor our filmClass-XandClass-Ycapacitor pages for more information.

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本文由星晴123转载自Knowles Official Website，原文标题为:The Role of EMI Filters in Power Electronics，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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WIMA（威马）电子设备用薄膜电容器选型指南

描述- 作为世界领先的制造商，WIMA开发和制造高品质薄膜电容器，专业用于所有电子领域。

型号- MKP1O142207I_ _ _ _ _ _,DCHPN07180EU00_ _ _ _,FKP3C024703F00_ _ _ _,DCP4I052006J_ _ _ _ _ _,FKP4O121505B00 _ _ _ _,FKP1T016805F_ _ _ _ _ _,DCP4R251507I_ _ _ _ _ _,MKP1G021002C_ _ _ _ _ _,FKP1X024707H_ _ _ _ _ _,MKS4J033305D_ _ _ _ _ _,MKP1O112702C_ _ _ _ _ _,MKS4G044706G_ _ _ _ _ _,MKP4R042707J00_ _ _ _,MKS4D026802A_ _ _ _ _ _,DCP6P06470EN00_ _ _ _,SMDTC02680TA00_ _ _ _,MKS4S032206D_ _ _ _ _ _,MKP1U011803F_ _ _ _ _ _,MKS4F031002C_ _ _ _ _ _,SMDIO12150XA00_ _ _ _,MKS4F051507E_ _ _ _ _ _,MKP1M022205B_ _ _ _ _ _,FKP2D021501J00_ _ _ _,MKS4G051007F_ _ _ _ _ _,MKP2D021001B00_ _ _ _,SMDIF02680TB00_ _ _ _,SMDNC02220TA00_ _ _ _,MKS4U041007K_ _ _ _ _ _,MKX2AW35606A00_ _ _ _,MKPFAW36806A_ _ _ _ _ _,FKP1J026807A_ _ _ _ _ _,SMDNC02150TA00_ _ _ _,DCP4I052207G_ _ _ _ _ _,MKS4G041005G_ _ _ _ _ _,MKS0C036800F00_ _ _ _,MKP1G036806B_ _ _ _ _ _,FKS3D013302B00_ _ _ _,FKP1O126807B_ _ _ _ _ _,SMDTF02150QA00_ _ _ _,DCP4S048007I_ _ _ _ _ _,MKS4D022203C_ _ _ _ _ _,MKP1F051007H_ _ _ _ _ _,SMDTC02100QA00_ _ _ _,MKP1M043909F_ _ _ _ _ _,MKP1U031206F_ _ _ _ _ _,SMDIF03220VA00_ _ _ _,DCP4G052206G_ _ _ _ _ _,MKS4J041006B_ _ _ _ _ _,SNMPU036808H_ _ _ _ _ _,DCP4H162209J_ _ _ _ _ _,DCHPR27129EX00_ _ _ _,SMDIG02470XA00_ _ _ _,SMDID02330QA00_ _ _ _,MKS4C051005F_ _ _ _ _ _,MKX2AW43306I00_ _ _ _,SMDND02220KA00_ _ _ _,MKS4B043302F_ _ _ _ _ _,MKY22W35607D00_ _ _ _,MKP1W034707I_ _ _ _ _ _,SNFPU031007E_ _ _ _ _ _,FKP1G031005H_ _ _ _ _ _,SMDID02150QA00_ _ _ _,MKS4G032203G_ _ _ _ _ _,MKX2AW34705G00_ _ _ _,FKP0D002200B00_ _ _ _,MKS4B036802C_ _ _ _ _ _,FKS3D012202B00_ _ _ _,FKS2D024701K00_ _ _ _,FKP2D014701G00_ _ _ _,DCP4I058007K_ _ _ _ _ _,SMDIC03330QB00_ _ _ _,FKP0C014700E00_ _ _ _,MKS4O121002E_ _ _ _ _ _,SMDND03330QB00_ _ _ _,FKP1J041509F_ _ _ _ _ _,DCP4G042006A_ _ _ _ _ _,SMDTF02220QA00_ _ _ _,MKP1U024705G_ _ _ _ _ _,SNMPO144708L_ _ _ _ _ _,MKP2F033301M00_ _ _ _,MKS4G053307J_ _ _ _ _ _,MKS4D061809H_ _ _ _ _ _,MKS4O114702C_ _ _ _ _ _,MKS4O116803C_ _ _ _ _ _,MKP2O122201N00_ _ _ _,DCHPI07406EW00_ _ _ _,MKP1U018204D_ _ _ _ _ _,MKP 4F,DCP4G061809E_ _ _ _ _ _,MKX2AW36805I00_ _ _ _,SMDIF03150VA00_ _ _ _,MKP1G026804C_ _ _ _ _ _,FKP4J026805F00 _ _ _ _,MKS2D041001K00_ _ _ _,MKP1J051009H_ _ _ _ _ _,MKY22W13903D00_ _ _ _,MKP1G051507K_ _ _ _ _ _,FKP0D001500B00_ _ _ _,FKP4O133307F00 _ _ _ _,SNMPM046008L_ _ _ _ _ _,GTOMI05700GF00_ _ _ _,FKP3F013303A00_ _ _ _,FKP3F026804J00_ _ _ _,MKY22W24704F00_ _ _ _,DCP4L048006G_ _ _ _ _ _,MKS4D054706I_ _ _ _ _ _ _,MKP4J043306J00_ _ _ _,FKP1G022205A_ _ _ _ _ _,SMDTF03330XA00_ _ _ _,SMDIC03220QB00_ _ _ _,MKP4J031504F00_ _ _ _,DCHPS06780E700_ _ _ _,FKP4T021005B00 _ _ _ _,MKP4D052707G00_ _ _ _,MKP1O131506B_ _ _ _ _ _,MKS4F041504J_ _ _ _ _ _,MKS4S034707E_ _ _ _ _ _,MKP1M012203C_ _ _ _ _ _,MKPF4W42206J_ _ _ _ _ _,SMDID02470TA00_ _ _ _,FKP1G041007G_ _ _ _ _ _,SNMPM044708J_ _ _ _ _ _,MKS4O126805B_ _ _ _ _ _,SMDND02150KA00_ _ _ _,MKS4D064709J_ _ _ _ _ _,SNMPO142208H_ _ _ _ _ _,FKP1O114704C_ _ _ _ _ _,SMDIC02150KA00_ _ _ _,MKY22W31205F00_ _ _ _,FKP4T041007K00 _ _ _ _,MKX2AW25603H00_ _ _ _,SNFPU033307I_ _ _ _ _ _,SNMPV026806D_ _ _ _ _ _,FKP4U003304B00 _ _ _ _,MKS4S041007H_ _ _ _ _ _,DCP4S051809F_ _ _ _ _ _,MKP1F022203C_ _ _ _ _ _,DCHPI07244ET00_ _ _ _,MKX2AW23902F00_ _ _ _,SMDIC02330KA00_ _ _ _,FKP2O103301D00_ _ _ _,DCHPS06585EM00_ _ _ _,FKP2D006801D00_ _ _ _,FKP4U012204D00 _ _ _ _,DCP4P044006G_ _ _ _ _ _,MKS 2,MKP 10,FKP4J021504C00 _ _ _ _,GTOMI05100GA00_ _ _ _,MKS 4,MKPFBW51009D_ _ _ _ _ _,MKP1W021205G_ _ _ _ _ _,MKS2B041001C00_ _ _ _,FKP1X031007J_ _ _ _ _ _,SNMPR044708L_ _ _ _ _ _,MKP1V015604D_ _ _ _ _ _,MKX2AW24704B00_ _ _ _,MKS4S033306I_ _ _ _ _ _,SNMPK047007K_ _ _ _ _ _,MKS4O126804F_ _ _ _ _ _,GTOMG05500GC00_ _ _ _,SMDTD03150KB00_ _ _ _,MKX2AW23903F00_ _ _ _,DCP6N06900EO00_ _ _ _,FKS3D011502B00_ _ _ _,MKS2G021501A00_ _ _ _,FKP0D003300B00_ _ _ _,SMDIF02680VA00_ _ _ _,MKS4C054706F_ _ _ _ _ _,MKP4F052207H00_ _ _ _,SMDTF02330QA00_ _ _ _,MKX14W31005D00_ _ _ _,MKP1D041806D_ _ _ _ _ _,MKP1U033307F_ _ _ _ _ _,MKP1V012704B_ _ _ _ _ _,MKP4R022204D00_ _ _ _,SMDIC02220KA00_ _ _ _,MKP4F041206A00_ _ _ _,MKP1V031506I_ _ _ _ _ _,FKP1U034709H_ _ _ _ _ _,FKP1G034707E_ _ _ _ _ _,FKP2O101501D00_ _ _ _,FKP0C006800B00_ _ _ _,FKP3F011502B00_ _ _ _,FKP3G021004B00_ _ _ _,MKP1F032205B_ _ _ _ _ _,FKP1Y016806D_ _ _ _ _ _,FKP4J041007G00 _ _ _ _,MKP2L023301M00_ _ _ _,MKS0G016800B00_ _ _ _,MKS2D024701A00_ _ _ _,SNMPK044707I_ _ _ _ _ _,DCHPN07110ER00_ _ _ _,MKX2AW15602C00_ _ _ _,MKP1W021805I_ _ _ _ _ _,SNMPW041008J_ _ _ _ _ _,DCP4H162409J_ _ _ _ _ _,DCHPI07492EX00_ _ _ _,DCHPI07152E200_ _ _ _,SNMPW032207F_ _ _ _ _ _,MKS4D062209E_ _ _ _ _ _,SNMPU034708E_ _ _ _ _ _,FKP4T022206A00 _ _ _ _,FKP 02,SMDTF02100TA00_ _ _ _,SMDIC03470VA00_ _ _ _,FKP4T024706D00 _ _ _ _,DCHCN06450JB00KS00,MKS4U041009D_ _ _ _ _ _,FKP1J021004D_ _ _ _ _ _,SMDTD02680KA00_ _ _ _,FKS2C022201E00_ _ _ _,MKP1W041007K_ _ _ _ _ _,MKS4C062709D_ _ _ _ _ _,MKP1D031003G_ _ _ _ _ _,SNMPM042208E_ _ _ _ _ _,SNMPU041007J_ _ _ _ _ _,MKS4C042204C_ _ _ _ _ _,GTOMI04450GA00_ _ _ _,MKP1J016802C_ _ _ _ _ _,MKPF3Y43306

选型指南 - WIMA - Edition 2023/2024 - 04.23 PDF 英文下载

Knowles（楼氏电子）多层陶瓷电容器选型指南

描述- At Knowles Capacitors, they make Single Layer, Multilayer, High Reliability and Precision Variable Capacitors; EMI Filters; and Thin Film Devices.

型号- XX1206N472J101NX050HTM-HB,UL SERIES,085J2500101JHT,404027K00470GQB-AF9,E01,0603 H,E03,E07,1206Y0500224KXT---,0805B123K501LEAR,SV2220,1210Y1000103KXT---,C17CF620J-7UN-X0T,1206J1000103MXTH20,1210Y2000103KCT---,2220YA300563KSTS3X,CR1206N562K101NHT-4,1812Y1000334MXTE03,RG3640R124K102PX---T,2225B3K06P80GQBRW221,8111M1000102JC□□□□□,1812YA250103KJT,1206G224K250NX050HTM,2220B1K00104JETJ,8131T,1206Y1000103MXTE07,8151M,8171M,1808JA250102KJTSYX,8111M,120625000223JQT--,8111N,C17UL620J7UNX-0T,8131M,0603J0500471JBB_ _ _,1206W476K6R3NX080T,1808JA250102GJTS2X,0805 H SERIES,0805J2504P70BUT,1812Y5000474KJT,C17CF470J7WAX0B,C17CF620J7UN-X0T,0603 H SERIES,1812Y5000474KJTWS2,1206Y1000473KNT,1206HD272F101NGHT,MD0603N102J500NHT-BA,MD0603BW102K500NHT-BA,AH SERIES,MD SERIES,CF SERIES,0805 H,1808JA250102GJTSYS,2520E563K501LGWR,1206YA120103JXT,C17AH620J-7UA-X0T,8121T,RC3640R124K102PX---T,1206G500391JGTH25,8161M,1206RE331J501NHT,0805Y1000103KST---,1206Y1K00152KXTVC1,8121M,8165M,8121N,8141M,ST3640B474M101LJXW-5R,8111M1000102JC□□□□□□,1210Y1000103JDT_ _ _,SV2220BB476M101LJW-10R

选型指南 - KNOWLES - 2024/2/15 PDF 英文下载

KNOWLES多层陶瓷片式电容器（MLCC）选型表

提供了多种封装，X7R符合AEC-Q200以及安规认证等特点。产品性能优越，Flexicap结构设计下具有极高的可靠性，产品涉及广泛，最高耐压6000V，旗下拥有非常有竞争力的高Q电容。

产品型号	品类	Size Code	Termination Material	Rated Voltage(Vdc)	Capacitance Value（pF、nF、uF）	Capacitance Tolerance(%、pF)	Dielectric Classification
0603J0500120JAB	Multilayer Ceramic Chip Capacitor	0603	Nickel barrier	50Vdc	12pF	±5%	C0G/NP0(1B) to AEC-Q200

选型表 - Knowles 立即选型

Change of Dielectric Withstand Voltage (DWV) for 630Vdc rated parts (2022/01)

型号- 1812Y6300104KJT---,1812RN104K630CTR,1812RN104K630CT,8121M6300104KJTC42---

产品变更通知及停产信息 - KNOWLES - 24h February 2022 PDF 英文下载

【经验】解析SLC和MLCC这两种电容器的应用

在电路设计初期，工程师们就需要决定是选用单层电容器(SLC）还是多层陶瓷电容器（MLCC）来满足应用需求。今天Knowles（楼氏）和你分享如下:总的来说，两者似乎有类似的功用，因为无论是SLC还是MLCC，它们都可作电路中的充储电、滤波或旁路之用。

设计经验发布时间 : 2022-05-10

楼氏电容使用FlexiCap™柔性端头的MLCC，具有更高的抗机械断裂能力

与传统的电容器相比，使用楼氏电容Knowles的FlexiCap™柔性端头的MLCC，能承受更大程度的电路板弯曲，从而具有更高的抗机械断裂能力，同时还具有与烧结端头电容器同等的电气特性。

厂牌及品类发布时间 : 2022-03-19

Filter Type SFSWR Solder Mount Hermetic EMI Filter (3.25mm Body Diameter, Glass Hermetic Sealed Bottom End) Datasheet

型号- SFSWR5000331MC0,SFSWR5000102MX0,SFSWR5000221MC0,SFSWR5000100ZC0,SFSWR5000472MX0,SFSWR5000682MX0,SFSWR5000471MC0,SFSWR,SFSWR5000103MX0,SFSWR5000680ZC0,TYPE SFSWR,SFSWR5000681MX0,SFSWR5000330ZC0,SFSWR5000222MX0,SFSWR5000151MC0,SFSWR5000101MC0,SFSWR2000223MX0,SFSWR1000333MX0,SFSWR5000220ZC0,SFSWR5000332MX0,SFSWR2000153MX0,SFSWR1000223MX0,SFSWR5000470ZC0,SFSWR5000152MX0

数据手册 - KNOWLES - Issue 1 - 2024/5/2 PDF 英文下载

SLCs vs. MLCCs: Which Capacitor Type is Right for My Application?

One early decision that circuit designers must make is to determine if a single-layer capacitor (SLC) or multi-layer ceramic capacitor (MLCC) is the right fit for their application needs.

设计经验发布时间 : 2022-02-24