EMC_Seminar

EMC、Electromagnetic Compatibility：电磁兼容EME、Electromagnetic Environment：电磁环境EME effects、Electromagnetic Environment effects：电磁环境效应Electromagnetic Emission：电磁发射Noise：噪声Interference：干扰Susceptibility：敏感度Degradation of Performance：性能劣化Electromagnetic Disturbance：电磁骚扰Electromagnetic Interference：电磁干扰Unwanted Signal：无用信号Undesired Signal：无用信号Interfering Signal：干扰信号Immunity to A Disturbance：骚扰抗扰度EMS、Electromagnetic Susceptibility：电磁敏感性Level：水平Lightning：雷击Lightning Withstand Level：抗雷击水平Limit：限值Limit of Disturbance：骚扰限值Limit of Interference：干扰限值Compatibility Level：兼容电平（此处指：系统能“兼容”的最大干扰电平）Emission Level of A Disturbance Source：骚扰源发射水平Emission Limit from A Disturbance Source：骚扰源发射限值Margin：裕量Emission Margin：发射裕量Immunity Level：抗扰度电平Immunity Limit：抗扰度限值Immunity Margin：抗扰度裕量Electromagnetic Compatibility Margin：电磁兼容裕量1.骚扰电压disturbance voltage在规定条件下测得的两分离导体上两点间由电磁骚扰引起的电压2.骚扰场强disturbance field strength在规定条件下测得的给定位置上由电磁骚扰产生的场强3.骚扰功率disturbance power在规定条件下测得的电磁骚扰功率4.参考阻抗reference impedance用来计算或测量设备所产生的电磁骚扰的、具有规定量值的阻抗5.人工电源网络artificial mains network串接在被试设备电源进线处的网络它在给定频率范围内，为骚扰电压的测量提供规定的负载阻抗，并使被试设备与电源相互隔离【注】：人工电源网络又称线路阻抗稳定网络（line impedance stabilization network ——LlSN）6.△形网络delta network能够分别测量单相电路中共模及差模电压的人工电源网络7.V形网络V－network能够分别测量每个导体对地电压的人工电源网络【注】：V形网络可设计成用于任意导体数的网络8.差模电压differential mode voltage一组规定的带电导体中任意两根之间的电压使差模电压又称对称电压（symmetrical voltage）9.共模电压common mode voltage每个导体与规定参考点（通常是地或机壳）之间的相电压的平均值10.共模转换common mode conversion由共模电压产生差模电压的过程11.对称端子电压symmetrical terminal voltage用△形网络测得的规定端子上的差模电压12.不对称端子电压asymmetrical terminal voltage用△形网络测得的规定端子上的共模电压13.V端子电压V－terminal voltage用V形网络测得的电源线与地之间的端子电压14.（屏蔽电路的）转移阻抗transfer impedance（of a screened circuit）屏蔽电路中两规定点之间的电压与屏蔽体指定横断面上的电流之比15.（同轴线的）表面转移阻抗surface transfer impedance（of a coaxial line）同轴线内导体单位长度L的感应电压与同轴线外表面上的电流之比16.（装置在给定方向上的）有效辐射功率effective radiated Power （of any device in a given direction）在给定方向的任一规定距离上，为产生与给定装置相同的辐射功率通量密度而必须在无损耗参考天线输入端皎加的功率【注】：如不注明，无损耗参考天线系指半波偶极子17.（检波器的）充电时间常数electrical charge time constant （of a detector）检波器输人端突然加上一设计频率的正弦电压后，其输出端电压达到稳态值的（1—1／e）所需的时间18.（检波器的）放电时间常数eletrical discharge time constant （of a detector）从突然切除正弦输入电压到检波器输出电压降至初始值的1／e所需的时间19.（指示仪表的）机械时间常数mechanical time constant （of an indicating instrument）测量仪指示器的自由振荡周期与2xxxx之比【注】：自由振荡的特征是无阻尼运动20.（接收机的）过载系数overload factor（of a receiver）正弦输入信号最大幅值与指示仪表满刻度偏转时输入幅值之比，对应于这一最大输入信号，接收机检波器前电路的幅／幅特性偏离线性应不超过1 dB21.准峰值检波器quasi－peak detector具有规定的电气时间常数的检波器当施加规则的重复等幅脉冲时，其输出电压是脉冲峰值的分数，并且此分数随脉冲重复率增加趋向于122.准峰值电压表quasi－peak voltmeter准峰值检波器与具有规定机械时间常数的指示仪表的组合23.（准峰值电压表的）脉冲响应特性Pulse response characteristic（of a quasi－peak voltmeter）准峰值电压表的指示值与规则重复等幅脉冲的重复率之间的关系24.峰值检波器peak detector输出电压为所施加信号峰值的检波器25.均方根值检波器root－mean－square detector输出电压为所施加信号均方根值的检波器26.平均值检波器average detector输出电压为所加信号包络平均值的检波器【注】：平均值必须在规定的时间间隔内求取27.模拟手artificial hand模拟常规工作条件下，手持电器与地之间的人体阻抗的电网络28.（辐射）测试场地（radiation）test site在规定条件下能满足对被试装置的电磁发射进行正确测量的场地29.（四分之一波长）阻塞滤波器stop（quarter－wave）filter围绕导体设置的可移动的同轴可调谐机构，用来限制导体在给定频率的辐射长度30.吸收钳absorbing clamp能沿着设备或类似装置的电源线移动的测量装置，用来获取设备或装置的无线电频率的最大辐射功率31.带状线stripline由两块平行板构成的带匹配终端的传输线，电磁波在其间以横电磁波模式传输，从而产生供测试使用的电磁场32.横电磁波室TEM cell一个封闭系统，通常为矩形同轴线，电磁波在其中以横电磁波模式传输，从而产生供测试使用的规定的电磁场33.模拟灯dummy lamp一种模拟荧光灯无线电频率阻抗的装置，它可替代照明装置中的荧光灯以便对照明装置的插入损耗进行测量34.平衡一不平衡转换器balun用来将不平衡电压与平衡电压相互转换的装置35.电流探头current Probe在不断开导体并且不对相应电路引入显著阻抗的情况下，测量导体电流的装置36.接地（参考）平面ground（reference）Plane一块导电平面，其电位用作公共参考电位37.屏蔽壳体shielded enclosure。

电磁兼容性〔EMC〕或电磁干扰〔EMI〕室是一种高度专业化的测试设备，用于测试电子设备，违反有关辐射和传导射频〔RF〕发射和抗扰度的监管标准。

有许多不同类型的EMC测试设备，测试单元，放开地域测试站点〔OATS〕和用于EMC测试的EMC测试室。

在用于执行EMC测试的全部不同类型的EMC测试设备中，最常见的一种无疑是半消声室。

半消声室半消声室和OATS是几乎全部辐射和传导发射测试标准〔包含ANSI C63.4和CISPR 16〕中描述的首选测试设施。

这些标准非常详细地描述了低压无线电噪声发射的测量方法电气和电子设备。

术语“无回声〞表示非反射，无回声和无回声。

术语“半〞表示腔室的一局部是反射性的，通常是位于腔室底部的金属板接地参考平面。

地板保持反射并且没有装载汲取器的原因是因为它使现实世界更接近于自由空间环境，并且因为如果从被测设备发出的RF能量〔EUT〕，辐射发射测量更加可重复和X〕充分反映。

相反，穿过泡沫汲取材料的反射不同地衰减〔有时根本不衰减〕，这取决于撞击在其上的RF场的入射角。

虽然地板是反射性的，但是腔室的其余五个侧面用铁氧体瓦，RF泡沫汲取器或两者的混合组合处理，以使腔室看起来更像自由空间以产生其内产生的任何RF能量。

有关RF 汲取材料如何工作以及援助选择最合适您需求的RF汲取材料的更多详细信息，请参见参考文献2和3。

射频屏蔽室RF屏蔽室构成了半消声室的根底。

它是一种近射频不可穿透的金属盒，可在很宽的频率范围内提供高达100 dB的电场和磁场屏蔽效能。

它对排放测试很有用，因为来自外界的信号或环境噪声无法穿透它，因此更简单测量仅由EUT产生的辐射。

它还有利于抗扰度测试，因为机箱内部产生的信号不会泄漏到外界，可能对附近的设备或人员造成有害干扰。

请记住，半消声室有不同类型的屏蔽材料和配置，每个屏蔽材料和配置都有不同的屏蔽性能水平。

如果您的应用需要最大的屏蔽效果，那么您可能需要考虑双重电隔离的屏蔽材料。

Seminar教学法在健康评估中的应用【摘要】本文介绍了Seminar教学法在健康评估中的应用。

首先从研究背景、目的和意义入手，探讨了Seminar教学法在健康评估中的基本原理以及具体应用。

接着分析了Seminar教学法的优势与局限性，并对其与传统教学方法进行了比较。

对Seminar教学法在健康评估教学中的效果进行了评估，展望了其未来的应用前景。

本文总结了Seminar教学法在健康评估中的应用展望，并提出了未来研究方向，为相关领域的教学工作提供了参考。

Seminar教学法在健康评估教学中的应用有助于提高学生的主动学习能力，培养其问题解决和团队合作能力，为培养具有健康评估技能的专业人才奠定基础。

【关键词】Seminar教学法, 健康评估, 应用, 健康评估教学, 效果评估, 健康评估中的应用展望, 未来研究方向1. 引言1.1 研究背景健康评估是医学领域中非常重要的一个环节，通过对患者的生理指标、心理状态、生活习惯等方面进行全面评估，可以为医生制定科学合理的治疗方案提供重要依据。

在传统的医学教育中，对于如何进行有效的健康评估的教学方式常常比较单一，缺乏互动和实践的环节，导致学生在实际应用中的能力不足。

引入更加灵活、多样化的教学方法对于提升学生的综合能力和实践能力至关重要。

1.2 研究目的本研究旨在探讨Seminar教学法在健康评估中的应用，通过分析其基本原理、具体应用、优势与局限性、与传统教学方法的比较以及效果评估，进一步了解该教学法在健康评估教学中的有效性和实用性。

具体目的如下：1.了解Seminar教学法在健康评估中的基本原理，探究其在教学过程中的具体运作机制，为深入研究提供理论基础。

2.探讨Seminar教学法在健康评估中的具体应用情况，分析其在实际教学中的实际效果和应用场景，为教学实践提供参考依据。

4.评估Seminar教学法在健康评估教学中的效果，通过实证研究和数据分析，探讨该教学方法对学生成绩、学习兴趣等方面的影响，为教学改进提供实践指导。

必维国际检验集团 -- 电子电气部电子电器产品国际认证介绍Prepared by: Nancy Liu (国际认证部)Dec. 19, 2014必维国际认证服务简介服务范围安全 & EMC 能效 无线和通讯必维优势一站式服务：本地测试、产品评估、文件制作，以及注册或获得证书 必维获得多个国家发证资格（中东地区，巴西） 必维与多国认证机构签定认可协议，直接认可BV报告 必维可提供多个国家当地代理商服务 必维可提供完善的后续增值服务：提供最新资讯，技术或文件培训， 产品设计指导，工厂检查指导…Bureau Veritas IA Presentation - Dec. , 20142必维国际认证服务简介•Europe•Asia •North America•Middle East •Oceania •Africa•South AmericaBureau Veritas IA Presentation - Dec. , 20143必维国际认证服务主要国家Asia-Pacific 亚太地区Australia & New Zealand 澳大利亚和新西兰 China 中国 Japan 日本 Singapore 新加坡 Malaysia 马来西亚 Korea 韩国 Thailand 泰国 Cambodia 柬埔寨 Taiwan 台湾 Vietnam 越南 India 印度 HK 香港 Indonesia 印度尼西亚 The Philippines 菲律宾 Sri Lanka 斯里兰卡 Brunei 文莱 Kazakhstan 哈萨克斯坦 Laos 老挝 PakistanBureau Veritas IA Presentation - Dec. , 2014Africa 非洲地区South Africa 南非 Kenya 肯尼亚 Nigeria 尼日利亚 Algeria 阿尔及利亚 Libya 利比亚 Uganda 乌干达 Comoros 利摩罗 Congo 刚果 Burundi 布隆迪 Benin 贝宁 Tanzania 坦桑尼亚 Egypt 埃及4必维国际认证服务主要国家America 美洲地区Brazil 巴西 Mexico 墨西哥 Columbia 哥伦比来 Argentina 阿根廷 Chile 智利 Peru 秘鲁 Panama 巴拿马 Paraguay 巴拉圭 Venezuela 委内瑞拉 Uruguay 乌拉圭Middle East 中东地区Saudi Arabia 沙特阿拉伯 Israel 以色列 UAE 阿联酋 Kuwait 科威特 Lebanon 黎巴嫩 Bahrain 巴林 Jordan 约旦 Oman 阿曼 Qatar 卡塔尔 Turkey 土耳其 Yemen 也门Europe 欧洲地区Russia 俄罗斯 Ukraine 乌克兰 Serbia 塞尔维亚 Croatia 克罗地亚 Switzerland 瑞士 Norway 挪威 Sweden 瑞典 Finland 芬兰 UK 英国 Albania 阿尔巴尼亚 Moldova 摩尔多瓦 Belarus 白俄罗斯Bureau Veritas IA Presentation - Dec. , 20145必维国际认证服务简介— 必维国际认证服务简介—产品范围音视频和信息技术类设备计算机，笔忘本电脑，显示器，平板电脑，打印机，复印机，服务器，DVD 放映机， 功率放大器，音响，鼠标，键盘，电源…家用电器水壶，咖啡机，搅拌器，烤箱，微波炉，冰箱，洗衣机，空调，吸尘器…灯具固定式灯具，移动式灯具，嵌入式灯具，镇流器，LED驱动，灯管，灯泡 （荧光灯泡 ，节能灯泡，LED灯泡）， 灯座...零部件电线，插头，连接器，电线组件，开关..无线 & 通讯产品:带蓝牙和WiFI的玩具，电脑，手表，蓝牙耳机，蓝牙音响，无线鼠标，手机，平板， 无线路由器...光伏产品光伏组件，逆变器，蓄电池等电池干电池和可充电电池（电芯 和电池包）Bureau Veritas IA Presentation - Dec. , 20146主讲国家Australia & New Zealand 澳大利亚和新西兰 Japan 日本 Korea 韩国 China 中国 India 印度 Argentina 阿根廷 Mexico 墨西哥 Brazil 巴西Bureau Veritas IA Presentation - Dec. , 20147大洋洲地区VXXXX/QXXXX澳大利亚 澳大利亚Rating: 240V, 50Hz新西兰 新西兰Rating: 230V, 50HzBureau Veritas IA Presentation - Dec. , 20148澳大利亚和新西兰 （RCM）ERAC: Electrical Regulatory Authorities Council 电气法规管理委员会 EESS: Electrical Equipment Safety System 电子产品安全系统澳洲认证要求改变2013年3月1日起，原来的认证标志（C-Tick，A-Tick ，RCM）统一为唯一的标志 RCM。

2009 Murata EMC SeminarForChanghong上海市长宁区兴义路8号万都中心1201室村田(中国)投资有限公司村田电子贸易村田电子贸易（（上海上海））有限公司Agenda:1. EMC Components types and Selection guid;2. Murata EMC Components Introduction●BLM series Beads;●NFM series three-terminal Capacitor;3. Murata EMC Solution for Differential Signal NoiseSuppression;●USB2.0;●HDMI1.3;●LVDS;4. Murata Power InductorAgenda:1. EMC Components types and Selection guid;2. Murata EMC Components Introduction●BLM series Beads;●NFM series three-terminal Capacitor;3. Murata EMC Solution for Differential Signal NoiseSuppression;●USB2.0;●HDMI1.3;●LVDS;Three Terminal CapacitorChip Ferrite beads Common mode Choke coilsLC/RC FilterRF InductorWirewoundLQW15/18 seriesFilm typeLQP03/15 seriesMultilayerLQG15/18 series040206030201040204020603SizeWirewoundLQH3NP seriesWirewoundLQH32C seriesMultilayerLQM18/21F seriesWirewoundLQH2MC series08061210Size06030805Power Inductor InductorEMI Filter1212 ProductsNoiseSignalGround LineNoise energy => HeatNoise is bypassed togroundEMI Filter Performance|Z| =2πfL|Z| =1/2πfCSignal Line/Power LineSignal Line/Power LineNoiseSignalSignalTypical ApplicationsSuppression of noise radiation from I/O cable;Chip Ferrite BeadsI/O Surge ProtectionSuppression of noise radiation from internal connection cablePrevention of noise conduction through IC Grounds;Chip Ferrite BeadsNoise suppression on high density bus lines;Chip Ferrite Beads / ArraySuppression of noise radiation from fast signal lines;Chip Signal line filterSuppression of switch mode noise;DC power line filterNoise suppression on IC power line;Chip 3-Terminal Capacitor Chip Ferrite BeadsNoise suppression on data bus line;Chip 3-Terminal Capacitor Chip Ferrite Beads / ArrayNoise suppression on telephone lines USB / IEEE1394 lines;Common mode choke coilSuppression of noise radiation from fast I/O cable;Chip Signal line filterFunction of EMC components Separating signal and noiseSignal + NoiseSignalNoiseEMIfilterFreq.LevelSignal NoiseLow pass filter separates signal and noise.Freq.InsertionlossFunction of EMC componentsRelationship between Noise and WaveformThird HarmonicFifth HarmonicSixth HarmonicFilter Type of Filter Noise Level without FilterNoise LevelWaveformEMI Filter with low shape factorEMIFilter with high shape factorcharacteristicsdBf1fFiltercharacteristics dB f1f dB fdBfWaveformEMI Filter Insertion VS FrequencySignal band Noise bandFrequencyI n s e r t i o n L o s sEMI filter with high shape factorEMI filterwith low shape factorf1 f2EMC 器件特性的表征器件特性的表征：：插入损耗5050ΩΩ5050ΩΩEMI filterA (V)C (V)5050ΩΩ5050ΩΩA (V)B (V)插入损耗2040608010011/101/1001/1,0001/10,0001/100,000Voltage rate example1(V)0.1(V)0.01(V)1(mV)0.1(mV)0.01(mV))(log 20dB CB=I n s e r t i o n l o s s (d B )ｊ2πf Cap１We generally call “Bypass capacitor”“De-coupling capacitor”5050ΩΩ5050ΩΩA (V)C (V)5050ΩΩ5050ΩΩA (V)B (V)CapZ ＝0204060800.11101001000周波数周波数((MHz MHz))挿入損失(d B )Insertion loss characteristics of capacitors100p F 1000p F10000p F100000p F 20d B /d e c .ノイズノイズ電流電流電流ををバイパスCapacitor Makes FilterWe generally call “inductor”and “choke coil.”For EMC solution we use usually ferrite beads.5050ΩΩ5050ΩΩA (V)C (V)5050ΩΩ5050ΩΩA (V)B (V)Z ＝j 2πf LL0204060800.11101001000周波数周波数((MHz MHz))挿入損失(d B )Insertion loss characteristics of inductor1000n H100n H10000n H100000n H 20d B /d e c .20dBReducing noise currentGenerally, insertion loss of ferrite beads is slower curvethan other inductors.Inductor Makes FilterEquivalentSeriesInductance(ESL) CapacitorInductorParasiticcapacitance To get high insertion loss at high freq. band we should use low ESL capacitor and low parasitic capacitance inductor 0204060800.11101001000周波数周波数((MHzMHz))挿入損失(dB)1608サイズ積層積層コンデンサコンデンサ100000pFfofo=2πLC１CapacitorInductorTrace on the PCB has parasitic components.inductorNoise routeviacapacitorCapacitance value and ESL value influence capacitance freq. characteristics.020*******.11101001000周波数周波数((MHz MHz))挿入損失(d B )0603size MLCC freq. characteristics （measured ）100000pF10000pF 1000pF 100pFESL=0.5ｎH周波数周波数((MHz MHz))挿入損失(d B )0603size MLCC freq. characteristics （calculated ESL value changes ）Cap=10000pFESR=0.15ohm0.5nH5nH0.05nH 0.005nHBefore SRF: Insertion loss depends on cap. value.After SRF: Insertion loss depends on ESL value.(ESL include component’s ESL and pattern’s.)Capacitor Frequency CharateristicsI n s e r t i o n l o s s (d B )20406080100100k1M 10M 100M 1G 10G5k1k5020010measurement impedance measurement impedance（（Ω）Chip 3terminal cap. 100Chip 3terminal cap. 100ｐｐF Insertion lossFreq. Freq. （（MH MHｚ）ｚ）Insertion loss value depends on circuit impedance.On high impedance circuit capacitor is effective.On low impedance circuit ferrite beads is effective.CapacitorInductorInsertion loss depends on circuit impedance40100k1M 10M 100M 1G 10GFreq. Freq. （（MH MHｚ）ｚ）10502001k 5k102030measurement impedance measurement impedance（（Ω）Chip ferrite beads 600Chip ferrite beads 600ΩΩat 100MHz Insertion lossI n s e r t i o n l o s s (d B )Relation between Selecting EMI filter and Circuit ImpedanceOutput impedance (Zo)High LowH i g hL o w CapacitorπtypeL typeL typeinductorT typeEMIfilterZiZo Input impedanceOutput impedanceHow to chose EMI filterI n p u t i m p e d a n c e (Z o )2009 Murata EMC Seminar For ChanghongAgenda:1. EMC Components types and Selection guid;2. Murata EMC Components Introduction●BLM series Beads;●NFM series three-terminal Capacitor;3. Murata EMC Solution for Differential Signal NoiseSuppression;●USB2.0;●HDMI1.3;●LVDS;Chip Ferrite BeadsChip Ferrite Bead Technology TrendDown SizingDown Sizing High FrequencyHigh Frequency Large Rated CurrentLarge Rated Current ArrayArray100MHz100MHz 500MHz500MHz 1GHz1GHz 3A3A 6A6A 020102010402040206030603Wide Frequency RangeWide Frequency Range 0200400600800100012001400160018002000110100100010000Frequency (MHz)I m p e d a n c e (o h m )HP4291ABLM18AG102SN1BLM18HG102SN11A 1A BLM SeriesComposition ratio of Ferrite Beads by size60%50%40%30%20%10%0%96979899012345678910Year01005 size0201 size0402 size0603 size0805 size1206 size1806 sizeRed Font ：New（）impedance at 100MHz Large current type ＢＬＭ＊＊Ｐ/Ｅ/Ｓ/KG SeriesRatedCurrent（ｍＡ）0402 size0603 size0805 size1206 size 700BLM15EG221SN1(220Ω)1000BLM15PG100SN1(10Ω)BLM18PG300SN1(30Ω)BLM18EG221TN1(220Ω)BLM18PG471SN1(470Ω)1200BLM18PG331SN1(330Ω)1300BLM15PD121SN1(120Ω)BLM18KG601SN1(600Ω)1400BLM18PG221SN1(220Ω)1500BLM15EG121SN1(120Ω)BLM15PD800SN1(80Ω)BLM18PG181SN1(180Ω)BLM18SG331TN1(330Ω)BLM18KG471SN1(470Ω)BLM21PG331SN1(330Ω)BLM31PG601SN1(600Ω) 1700BLM15PD600SN1(60Ω)BLM18KG331SN1(330Ω)2000BLM18PG121SN1(120Ω)BLM18EG101TN1(100Ω）BLM18EG121SN1(120Ω)BLM18EG221SN1(220Ω)BLM21PG221SN1(220Ω)BLM31PG391SN1(390Ω) 2200BLM15PD300SN1(30Ω)BLM18KG221SN1(220Ω)2500BLM18SG221TN1(220Ω)3000BLM18PG330SN1(33Ω)BLM18SG121TN1(120Ω)BLM18KG121TN1(120Ω)BLM21PG300SN1(30Ω)BLM21PG600SN1(60Ω)BLM31PG500SN1(50Ω)BLM31PG121SN1(120Ω) 3500BLM18KG700TN1(70Ω)4000BLM18SG700TN1(70Ω)6000BLM18SG260TN1(26Ω)BLM21PG220SN1(22Ω)BLM31PG330SN1(33Ω) Ferrite Bead Rated Current -ImpedancePart Number Impedance Rated DCat 100MHz Current Resistance (Ω) (mA) (Ω max.)BLM18KG260TN1 26 6000 0.007BLM18KG700TN1 70 3500 0.022BLM18KG121TN1 120 3000 0.030BLM18KG221SN1 220 2200 0.050BLM18KG331SN1 330 1700 0.080BLM18KG471SN1 470 1500 0.130BLM18KG601SN1 600 1300 0.150(BLM18KG_TN1: 1.6X0.8X0.6mm)(BLM18KG_TN1: 1.6X0.8X0.8mm)BLM18KG series: 060326Ω-600ΩBLM18KG SeriesNEWBLM15PD SeriesBLM15PD series:0402 (1.0X0.5X0.5mm)30Ω-120ΩPart Number Impedance Rated DCat 100MHz Current Resistance(Ω) (mA) (Ω max.) BLM15PD300SN1 30 2200 0.035 BLM15PD600SN1 60 1700 0.060 BLM15PD800SN1 80 1500 0.070 BLM15PD121SN1 120 1300 0.090BLM15EG seriesBLM15EG seriesFor High Frequency NoiseHigh Rated CurrentHigh Impedance at high frequency0100200300400110100100010000Frequency (MHz)I m p e d a n c e (Ω)BLM15AG221SN1BLM15EG221SN1700mA300mABLM15EG SeriesBLM15EG series:0402 (1.0X0.5X0.5mm)120Ω, 220ΩImpedance Impedance Rated DCPart Number at 100MHz at 1GHz Current Resistance(Ω) (Ω) (mA) (Ω max.) BLM15EG121SN1 120 145 1500 0.095 BLM15EG221SN1 220 270 700 0.28BLM18EG/HE SeriesBLM18EG/HE series:0603 (1.6X0.8mm, SN1: t=0.8mm, TN1: t=0.5mm)Impedance Impedance Rated DC Part Number at 100MHz at 1GHz Current Resistance(Ω) (Ω) (mA) (Ω max.) BLM18EG101TN1 100 140 2000 0.045 BLM18EG121SN1 120 145 2000 0.04 BLM18EG181SN1 180 260 2000 0.05 BLM18EG221TN1 220 300 1000 0.15 BLM18EG331TN1 330 450 500 0.21 BLM18EG391TN1 390 520 500 0.30 BLM18EG471SN1 470 550 500 0.21 BLM18EG601SN1 600 700 500 0.35 BLM18HE601SN1 600 600 800 0.25 BLM18HE102SN1 1000 1000 600 0.35 BLM18HE152SN1 1500 1500 500 0.502009 Murata EMC Seminar For ChanghongAgenda:1. EMC Components types and Selection guid;2. Murata EMC Components Introduction●BLM series Beads;●NFM series three-terminal Capacitor;3. Murata EMC Solution for Differential Signal NoiseSuppression;●USB2.0;●HDMI1.3;●LVDS;4. Murata Power Inductor2 Terminal CapacitorEquivalentCircuitInside structureEquivalentCircuitInside structure Inside Electrode Inside Electrode3 Terminal CapacitorInside electrode has a little inductance2 terminal capacitor can not work well in G Hz band because of this inductance3 terminal capacitor construction convert one of inside electrode inductance to series to noise route.And by-pass route inductance was separated in two ways.Digital Signal LineCable ConnectionPower Supply LineDigital signalRS232C etc.Analog signalHeadphone, Microphone etc.Digital signalClock , Data etc.Noise Suppression by NFMCountermeasure for Power line noise Minimization of mounting space & Optimization. .Many capacitors are required at IC’s power line for power integrity and noise suppression.Main ICNo space to mount . Suitable layout is difficult !!31Countermeasure for Power line noise Minimization of mounting space & Optimization.By using high performance capacitor (NFM), the number of usage can be reduced!! =>can design these capacitors on suitable position.Power Line of Main IC44pcs (Beads + Capacitors)14pcs!! (NFM 9pcs + Capacitors5pcs)32Countermeasure for Power line noise Minimization of mounting space & Optimization.Ripple voltage3.5 3.45 3.4 3.35 3.3 3.25 3.2 3.15 3.1 -0.0004 -0.0003 -0.0002 -0.0001 0 0.0001 0.0002 0.0003 0.0004Sam eBead+Cap10uF+110nF NFM_10uFqua l i ty!Measurement point (3.3V power line)33Countermeasure for Power line noise Minimization of mounting space & Optimization.Noise measurementMagnetic field distribution measurement data by EMI testerInitialAfterImp rov ed !EMI TESTER34Effective noise countermeasure with 3terminal capacitor (NFM) 2terminal capacitorPower line PinZ3terminal capacitor (NFM)GND Pin Noise source is DSPZDC power supplyDSPDC power supplyDSPZ8 Z1 Z7Z6Z5 Z4bypass capacitorZ8 Z4 Z5Z6 Z1 Z3 Z2Z2Z3Z7With 3terminal capacitor, noise current doesn’t flow to other circuit2terminal capacitor 7pcs3terminal capacitor 2pcs35Countermeasure for Power line noise Minimization of mounting space & Optimization.36Noise suppression for IC power lineReduction of ESL by land pattern, ground and via under NFM. Two terminal capacitor Three terminal capacitor (NFM)MSLMSLGND GNDCurrentLarge dimension for current path InductanceCurrentsmall dimension for current pathExpansion currentSuppression of expansion current37Classification by Application NFM_ _ C series ----- For Signal Line Capacitance Variation is richExample 22,47,100,220,470,1000,2200,22000pFNFM_ _ P series ----For Dc power Supply LineHigh capacitance0.022uF - 27uF (22000pF)High Rated Current38NewNFM15PC seriesFor DC Power Supply Line NFM15PC series: 0402 (1.0X0.5X0.3mm) 0.1 to 0.47uFNFM15P seriesNewPart NumberCapacitance (uF) 0.1Rated Current (A) 1Rated Voltage (Vdc) 10NFM15PC104R1A3NFM15PC474B0J30.4726.339NFM18PC seriesNFM18P series For DC Power Supply Line NFM18PC series: 0603 (1.6X0.8X0.8/0.6mm) 0.1uF – 2.2uFPart Number NFM18PC104R1C3 NFM18PC224R0J3 NFM18PC474R0J3 NFM18PC105R0J3 NFM18PC225B0J3 NFM18PC225B1A3Capacitance (uF) 0.1 0.22 0.47 1 2.2 2.2Rated Current (A) 2 2 2 2 2 4Rated Voltage (Vdc) 16 6.3 6.3 6.3 6.3 1040NFM18PS series0603 (1.6X0.85X0.6mm) NFM18PS series:0.47uF –4.7uF424.7NFM18PS475R0J36.321.0NFM18PS105R0J36.320.47NFM18PS474R0J3Rated Voltage(Vdc)Rated Current(A)Capacitance(uF)Part NumberP r e l i m in a r yFrequency [MHz]I n s e r t i o n L o s s [d B ]0603 SizeNFM18PS474R0J3NFM18PC474R0J3Standard TypeNFM18PS seriesEDN Award:Best Component4.7uFNFM18PS475R0J31.0uF NFM18PS105R0J30.47uF NFM18PS474R0J3Capacitance Part Number P r e l im i n ar yPart Number Capacitance(mF)Rated Voltage (Vdc)Rated Current (A )IR (min.)(M ohm)Operating Temperature Range(℃)LxW (mm)T (mm)NFM21PC104R1E30.1±20％2521000-55 to +125 2.0x1.250.85±0.1NFM21PC224R1C30.22±20％1621000-55 to +125 2.0x1.250.85±0.1NFM21PC474R1C30.47±20％1621000-55 to +125 2.0x1.250.85±0.1NFM21PC105B1A3 1.0±20％104500-40 to +85 2.0x1.250.85±0.1NFM21PC105B1C3 1.0±20％164500-40 to +85 2.0x1.250.85±0.1NFM21PC225B0J3 2.2±20％ 6.34200-40 to +85 2.0x1.250.85±0.1NFM21PC475B0J34.7±20％106100-40 to +852.0x1.250.85±0.1Part Number Capacitance(mF)RatedVoltage(Vdc)RatedCurrent (A)IR (min.)(M ohm)Operating Temperatur e Range(℃)LxW (mm)T (mm)NFM18PC104R1C30.1±20％1621000-55 to +125 1.6x0.80.6±0.1NFM18PC224R0J30.22±20％6.321000-55 to +125 1.6x0.80.6±0.1NFM18PC474R0J30.47±20％6.321000-55 to +125 1.6x0.80.6±0.1NFM18PC105R0J3 1.0±20％6.32500-55 to +125 1.6x0.80.8±0.1NFM18PC225B0J32.2±20％ 6.32200-40 to +85 1.6x0.80.6±0.1NFM18PC225B1A3 2.2±20％104200-40 to +851.6x0.80.8±0.1NFM21/18P series is the EMI suppression filters for high speed IC power lines!!High performance! 3terminal capacitor NFM series2009 Murata EMC Seminar For ChanghongAgenda:1. EMC Components types and Selection guid;2. Murata EMC Components Introduction●BLM series Beads;●NFM series three-terminal Capacitor;3. Murata EMC Solution for Differential Signal NoiseSuppression;●USB2.0;●HDMI1.3;●LVDS;4. Murata Power InductorUSB cable becomes radiative antenna(have nothing to do with USB block)Unstable GND layerCross-talkNoise from other circuit Noise source of USB(2):Be affected from other circuitNoise problem of differential transmission lineMeasurement system for USB Full SpeedEvaluation boardTest fixture board(E2645-66501:Agilent)Oscilloscope (Infinium54846A:Agilent)5mCH1:D+CH2:D-CH3:TRGUSB cable(5m)Personal computer USB equipment(FS signal->Trigger)Around 5cmHub Hub(for FS)To use ferrite bead for High SpeedWithout filterBLM18BB470SN1(47ohm at 100MHz)Failure01002003004005001101001000Fr equency [M H z]I m p e d a n c e [Ω]BLM18BA220SN (22ohm at 100MHz)Failure1002003004005001101001000Fr equency [M H z]I m p e d a n c e [Ω]Without filter1101001000100001101001000Fr equency [M H z]Im p e d a n c e [Ω]DLP11SN900HL2(90ohm at 100MHz)PassRecommended circuit for High SpeedChip Ferrite BeadBLM18KG121TN1BLM18KG221SN1DLW21HN900SQ2Wire Wound Common Mode Choke CoilDLW21SN900SQ2Film Common Mode Choke CoilDLP11SN900HL2D+D－GNDV DDUSBControllerIt may be made an error at EOP370ohm90ohmwithout filterTo use common mode chokeＶ＝Ｍd dtＩ-1.00.01.02.03.04.05.01.01.21.41.61.8T i me [s ]V ]o l t a g e [V -1.00.01.02.03.04.05.01.01.21.41.61.8T ime [s ]]V o l t a g e [V -1.00.01.02.03.04.05.01.01.21.41.61.8T i me [s ]a ]V o l t g e [V。

EMC电磁兼容培训(含多场合)EMC电磁兼容培训：理论与实践相结合，助力电子产品质量提升一、引言随着科技的飞速发展，电子产品在人们日常生活中的应用越来越广泛。

然而，电子设备在工作过程中产生的电磁干扰（EMI）和电磁敏感性（EMS）问题，不仅会影响设备的正常运行，还可能对其他设备产生干扰。

因此，电磁兼容（EMC）成为电子产品设计和制造中必须考虑的关键因素。

为了提高我国电子产品在国际市场的竞争力，加强EMC电磁兼容培训显得尤为重要。

二、EMC电磁兼容培训的重要性1.提高电子产品质量电磁兼容培训可以帮助电子工程师掌握EMC的基本知识和设计方法，从而在产品研发阶段就充分考虑电磁兼容问题，避免或减少产品在后期测试和整改过程中出现的问题，提高产品的质量和可靠性。

2.满足国内外法规要求各国政府对电子产品的EMC要求越来越严格，不合规的产品无法进入市场。

电磁兼容培训可以帮助企业了解相关法规和标准，确保产品在设计、生产和测试过程中符合要求，顺利进入国内外市场。

3.提升企业竞争力掌握EMC技术的企业可以在产品研发和生产过程中降低成本、缩短周期，提高市场竞争力。

电磁兼容培训有助于培养企业内部的技术人才，提升整体研发实力。

三、EMC电磁兼容培训内容1.理论知识培训（1）电磁兼容基本概念：介绍电磁兼容的定义、分类、产生原因等。

（2）电磁兼容相关法规和标准：解读我国及国际上的电磁兼容法规和标准，如欧盟CE、美国FCC等。

（3）电磁兼容测试方法：介绍传导干扰、辐射干扰、静电放电、电快速瞬变脉冲群等测试项目和方法。

（4）电磁兼容设计原理：讲解电磁兼容设计的基本原则和常用技术，如屏蔽、滤波、接地等。

2.实践操作培训（1）电磁兼容测试设备操作：学习使用电磁兼容测试设备，如信号发生器、频谱分析仪、天线等。

（2）电磁兼容测试案例分析：分析典型的电磁兼容问题，并提出解决方案。

（3）电磁兼容设计实例：结合实际产品，进行电磁兼容设计和整改。

seminar教学大纲在大学教育中，研讨会（seminar）教学是一种常见的教学方法。

它通过学生主动参与讨论和交流，促进学生的学习和思考能力的发展。

本文将探讨研讨会教学的大纲设计，以及如何有效地组织和引导学生的讨论。

一、研讨会教学的目标和原则研讨会教学的目标是培养学生的批判性思维和问题解决能力。

通过参与讨论，学生可以学会自主思考，提出问题，并通过与他人的交流和互动来获得新的见解和知识。

在研讨会教学中，教师的角色是引导者和组织者，而学生则是主要的参与者和学习者。

研讨会教学的原则包括学生主导、问题导向、互动交流和反思。

学生主导意味着学生在研讨会中发挥主动性和自主性，提出问题和观点。

问题导向意味着研讨会的讨论围绕特定的问题展开，通过讨论和交流来解决问题。

互动交流是研讨会教学的核心，学生之间以及学生与教师之间的互动和交流可以促进思想碰撞和知识共享。

最后，反思是研讨会教学的重要环节，通过反思，学生可以总结和巩固所学的知识和经验。

二、研讨会教学的大纲设计研讨会教学的大纲设计需要考虑以下几个方面：主题选择、学习目标、教学内容和评估方式。

主题选择是研讨会教学的关键，一个好的主题可以激发学生的兴趣和思考。

主题可以选择与课程内容相关的问题或者与社会热点话题相关的问题。

在选择主题时，教师需要考虑学生的背景知识和兴趣，以及教学的目标。

学习目标是研讨会教学的重要组成部分，它可以指导学生的学习和思考。

学习目标应该明确、具体和可衡量，可以包括知识目标、技能目标和情感目标。

例如，学生可以通过研讨会学习到某个专业领域的知识，提高批判性思维和表达能力，以及培养合作和团队精神。

教学内容是研讨会教学的核心，它需要根据主题和学习目标来确定。

教学内容可以包括教师提供的背景知识、相关文献和案例分析等。

同时，学生也可以通过自主学习和研究来获取更多的信息和素材。

评估方式是研讨会教学的重要环节，它可以帮助教师了解学生的学习情况和思考能力。

评估方式可以包括课堂讨论的表现、小组报告和个人论文等。

emc 英文术语Electromagnetic Compatibility (EMC) is a crucial concept in the world of electronics and electrical engineering. It refers to the ability of an electronic or electrical system to function properly in its intended environment without causing or being affected by electromagnetic interference (EMI). EMC is essential for ensuring the reliable and safe operation of a wide range of electronic devices, from everyday household appliances to complex industrial equipment.The term "EMC" encompasses two main aspects: electromagnetic emissions and electromagnetic susceptibility. Electromagnetic emissions refer to the unintentional generation of electromagnetic energy by electronic devices, which can interfere with the operation of other nearby devices. Electromagnetic susceptibility, on the other hand, refers to the vulnerability of a device or system to external electromagnetic disturbances, which can cause malfunctions or even damage.To achieve EMC, engineers and designers must consider both the emissions and susceptibility of their electronic systems. This involvescarefully designing the circuitry, shielding, and grounding of the device to minimize the generation of electromagnetic energy and to ensure that the device is resilient to external electromagnetic interference.One of the key aspects of EMC is the concept of electromagnetic compatibility standards. These are sets of guidelines and requirements that electronic devices must meet in order to be considered EMC-compliant. These standards are developed by various international organizations, such as the International Electrotechnical Commission (IEC), the European Union (EU), and the Federal Communications Commission (FCC) in the United States.The IEC, for example, has developed the IEC 61000 series of standards, which cover a wide range of EMC-related topics, including electromagnetic emissions, electromagnetic immunity, and electromagnetic field measurement. These standards provide detailed specifications for the maximum allowable levels of electromagnetic emissions and the minimum levels of electromagnetic immunity that electronic devices must meet.Compliance with EMC standards is crucial for the safe and reliable operation of electronic devices, particularly in safety-critical applications such as medical equipment, transportation systems, and industrial automation. Failure to meet EMC requirements can resultin malfunctions, equipment damage, and even safety hazards.To ensure EMC compliance, manufacturers and designers must follow a rigorous design and testing process. This typically involves conducting EMC simulations and measurements at various stages of the product development lifecycle, from the initial design phase to final product testing.One of the key tools used in EMC analysis is electromagnetic simulation software. These software packages allow engineers to model the electromagnetic behavior of their electronic systems and to predict the potential for electromagnetic interference. By identifying and addressing EMC issues early in the design process, engineers can reduce the time and cost associated with post-production EMC testing and compliance.In addition to simulation tools, EMC testing is also a critical component of the product development process. This involves subjecting the electronic device to a series of electromagnetic disturbances, such as electrostatic discharge, radiated electromagnetic fields, and conducted electromagnetic interference, to ensure that the device can withstand these disturbances without malfunctioning.The importance of EMC extends beyond the realm of electronics andelectrical engineering. As our world becomes increasingly interconnected and reliant on electronic devices, the need for effective EMC management has become more critical than ever. The proliferation of wireless communication technologies, such as Wi-Fi, Bluetooth, and cellular networks, has created a complex electromagnetic environment that requires careful coordination and management to ensure the reliable and safe operation of these systems.In the field of telecommunications, for example, EMC considerations are crucial for ensuring that different wireless systems can coexist without interfering with each other. This is particularly important in crowded urban environments, where multiple wireless networks and devices are operating in close proximity.Similarly, in the automotive industry, EMC is a critical factor in the design and development of modern vehicles. With the increasing integration of electronic systems in vehicles, from engine management to infotainment systems, the potential for electromagnetic interference has become a significant concern. Manufacturers must ensure that these systems are designed and tested to be EMC-compliant, to prevent issues such as engine stalling, display malfunctions, or even safety-related problems.Beyond the technical aspects of EMC, there are also importantregulatory and legal considerations. Many countries have implemented laws and regulations that require electronic devices to meet specific EMC standards before they can be sold or used within their borders. Failure to comply with these regulations can result in fines, product recalls, or even legal action.In conclusion, Electromagnetic Compatibility (EMC) is a critical concept that underpins the reliable and safe operation of a wide range of electronic devices and systems. By understanding and addressing EMC considerations throughout the product development lifecycle, engineers and designers can ensure that their products not only function as intended but also coexist harmoniously within the complex electromagnetic environment that surrounds us. As our reliance on electronic technologies continues to grow, the importance of EMC will only become more pronounced, making it an essential area of study and practice for anyone working in the field of electronics and electrical engineering.。

标准三米法EMC暗室EMC在屏蔽室的天花板和四面墙贴上吸波材料，地面的吸波材料米用活动式铺设，即构成EMC实验室。

一.用途：可对通讯设备、电子、电气设备进行电磁兼容（EMC测试，即电磁干扰（EMI）和电磁敏感度（EMS测试。

适用频率30MHZ-18GH可延至40GHz二.主要规格及性能屏蔽效能，满足EN 50147-1、GB12190-90技术参数如下：米法EMC 音室EMC在屏蔽室的天花板和四面墙贴上吸波材料，地面的吸波材料采用活动式铺设，即构成EMC实验室。

一.用途：可对通讯设备、电子、电气设备进行电磁兼容（EMC测试，即电磁干扰（EM）和电磁敏感度（EMS测试。

适用频率30MHZ-18GH可延至40GHz二.主要规格及性能屏蔽效能，满足EN 50147-1、GB12190-9Q技术参数如下：频率屏蔽效能14 kHz> 60 dB磁场100 kHz> 80 dB磁场100 kHz> 100 dB电场1 MHz> 100 dB磁场1 MHz> 100 dB电场100 MHz> 100 dB电场1 GHz> 100 dB平面波10 GHz> 100 dB微波18 GHz> 100 dB微波归一化场地衰减测试的NSA值与理论的NSA值相比较，其误差在土4dB以内满足ANSI C63.4、EN55022 CISPR-22:1997、GB9254-1998《信息技术设备的无线电骚扰限值和测量方法》附录A的要求（见表一）[NextPage]测试空间分布场均匀度在0-6dB 之内，满足IEC61000-4-3 ，GB/T17626.3-1998 的要求（见表二）。

[NextPage]按照CISPR22 Claas B （GB9254-1998 的规定，在30MHz-1GHZ勺频率范围内，无EUT的情况下，测得的环境电平值，至少低于规定的B级限值10dB。

关于做seminar和做研究的基本原则
⼀、怎样做seminar
1、作报告：准备做报告的同学要认真阅读⽂献，重点要把握以下⼏点：
（1）⾸先要了解作者⽴题意图，理解并学习作者整个研究的设计。

（2）着重学习作者的研究⼿法。

（3）重点关注作者的结论是什么，哪些是创新点或新的知识，这些知识点应该作为我们研究的基础，切忌⽣硬模仿别⼈的实验过程。

2、听报告：听报告的同学态度要端正，尊重作报告同学的劳动成果，并从报告中学习新的知识和⼿法。

⼆、怎样做研究
1、做研究必须要有问题，针对问题设计实验。

做研究实际是⼀个围绕问题，找证据点，然后通过设计实验来证明证据点的过程。

前提需要⼤量学习：（1）学习基础知识。

这些知识可以从书本中学，也可以从⽂献中学。

（2）学习新的实验⼿法。

实验不应只了解实验室已有的⼿法，也应拓展思路，学习掌握其他好的实验⼿法。

2、要学会逻辑性思考。

逻辑由概念组成，所以应准确理解和把握概念。

如果理解不准确，则会思维紊乱，导致逻辑思考得到的结论与实际不符。

同样在写毕业论⽂时也应注意整体的逻辑性。

3、⼯程硕⼠也需要有⾃⼰的研究，⽅向是实现⼯程化，⽽不是重点放在“研究为什么”。

其中最便捷的⽅法是：对已有的知识进⾏组合，找到可⾏的⼯艺及参数，然后经过⾃⼰的验证，并做优化处理，最终确定出⼯艺流程图、⼯⼚布局图和设计说明。

前提要熟悉物料平衡、相关设备和经济预算等知识。