【经验】解析以太网辐射超标原因及其整改方案分享
某网络机顶盒有一个HDMI接口、一个网口、若干USB端口，塑料外壳。进行辐射骚扰测试时，该机顶盒的网口传输模式测试超标，需要分析其辐射超标产生的原因，并给出相应的对策。辐射原始测试数据如下：
数据分析：
1、水平部分：250MHz、375MHz、500MHz、625MHz、750MHz、875MHz频点能量比较强，接近测试限制；
2、垂直方向：在30-110MHz有一个窄带接近测试限制。
辐射源头分析：
1、水平方向的超标频点都是网络时钟频率125MHz的倍频点；
2、低频超标部分首先怀疑是电源引起的，在电源上增加磁环，没有改善，但是把网线拔掉 后，低频部分改善很多。
结论：把网线拔除后，水平和垂直的频点都能得到很大改善，所以断定不满足测试要求的频点都是由网口设计产生。
处理措施：
1、在TR+/TR- TX+/TX- 增加33PF滤波电容，对策后数据如下：
2、更改网络变压器，两种变压器内部电路对比如下：
原变压器
更改新变压器，两种变压器区别如下：
1)从原理图可以看出:
原变压器的CMC在前面TX:P1-3 RX:P6-8, P2 P7 为中心抽头,TRANSFORMERS 在后面TX:P16-14 RX:P11-9, P15 P10 为中心抽头;
新变压器:TRANSFORMERS 在前面面TX:P1-3 RX:P6-8, P2 P7为中心抽头,CMC 在后面P16-14 RX:P11-9, P15 P10 为中心抽头。
2)从电性评估:
原变压器的TX:P1-3 RX:P6-8 的DCR 参数为1.2 ohms MAX,TX:P16-14 RX:P11-9 的DCR 参数为0.8 ohms MAX;
新变压器的TX:P1-3 RX:P6-8 的DCR 参数为0.8 ohms MAX,TX:P16-14 RX:P11-9 的DCR 参数为1.2 ohms MAX。
3)从材料评估: 新变压器使用了更好的抗干扰材料.(EMI测试可以看出)
3、测试数据如下：
增加对策后网口性能评估，眼图测试如下：
增加对策后眼图测试OK，对产品性能影响不大。
思考与启示
网络端口RJ45作为现在最常用的端口之一，它的辐射超标问题，也是我们经常遇到的，因此掌握它的整改方法的同时一定要在设计之初在器件选型和layout时给予足够的重视，才能避免后续整改浪费大量人力物力！
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本文由JWM转载自韬略科技，原文标题为:以太网辐射超标整改方案，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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Eaton Bussmann(伊顿巴斯曼) 磁性产品（电感器和变压器）选型指南
目录- Magnetics products overview Automotive solutions Computing (V-core, multi-phase, VRM, POL) solutions Commercial and industrial solutions Custom capabilities and electronic components
型号- HCV1707,WCLA2012V1,FPT1006,FP1109,SDCHA1V60,FP1108,WCLA1005V1,MPIA40-V2,FP0505R,UP2B,CTX-52M,WCLA1608V1,SD14,SD12,SD10,WCL2520,HCM1A0703,FP1105,SD18,SDQ,FP0805,TL1212V2,FP0807,UP1B,DR1050,TLP1013V1,HCM1A1104,CTX01-18738-R,HCM1305,HCM1307,POE13,CMS3,CMS2,DRAQ75,CMS1,RL,SDCHA,HCMA0703,FP1206,FP1208,DRQ74,HC2LP,UP4B,SDCH,ECMS1V0704,POE26,SD,HCM1A1305V2,MCLA2012V1,HCMA1707,MCL2012V2,ACE1V,MCL2012V1,SDCL,SG1,SG3,SG2,SG5,SG4,SDCHA1V50,SG7,SG6,TL1211V2,SG9,TL1211V1,SG8,MCLA1608V1,FP0906,CL,CTX01-18754-R,SD20,DRA73,UP3B,MCLA1608V2,SD25,HCM1A,DRA74,MPI40-V2,FP1008L,DRQ73,SDCX,CTX_1X,HCSA1V1008,MCLA3216V1,SD53,CL1108,CPL2,DR,CTX__-3,CTX__-2,EPM78,CTX__-4,SDCLA1V40,HCM0703,CTX__-1,HCF1007,HC1,HC3,SDCH1V50,EPM12V2,UP,EPM12V1,HC8,CTX17-18913-R,HC7,HCM1A4020V2,HC9,EXL1V0402,HCSA,FP3,FP2,FP4,CTX__-1P,HCM,MCL1608V1,FP0507V,MCL1608V2,ECMS1V1306,VP1,VP3,CPLE,SDCH1V60,VP2,VP5,VP4,CLA1108,HCM1103,HCM1A1307,CPLA,HCM1A1305,HCM1104,FP1107R,POE4,FP,HCV1206,DR1040,CTX__-2P,CTX-52LP,FP1108B,FP0910V,SDQ25,ECMS1V0905,HCMA1104,POE7,HCM1A0805,HCX,ECMS,ECMT,CTX__-3P,SDCXA,UP2.8B,MCLA1005V2,CL0608,FP1109B,DR1030,FPX,SDQ12,HC8LP,DRAQ127,CTX__-4A,UP5,HCM1A0703V2,SDCH1V80,MCL1005,WCL,TL1012V2,DR124,FP1505,DR125,EPM,ACE1V3225,SDCL1V25,MPI,CTX__-4P,ACE1V2012,CLB1108,VPH1,FP1012V,DR127,VPH2,VPH3,VPH4,VPH5,SD6030,TLVR,HCM0503,HCP0704,MFBA2V1005,MPIA25-V2,HCM1AV2,DRAP127,UP2UC,DRAP124,SDCL1V30,DRAP125,FP1308R,DRAP,DRAQ,CTX17-18765-R,FP0404,EXL1V0603,CMS,EXL1V0606,SD8328,EXL1V0605,CL0904,FP1309B,SD6020,FP1108L4,FP1108L3,MPIA20-V1,FP1108L2,HCM1707,MPI25-V2,WCL3225,FP1108L1,CTX-52,SDCL1V40,CMLA,CL1110-R,ACE1V4532,TL1011V2,DRA127,CL1208,DRA125,FP1010R,DRA124,FP1010V,HCMA1305,MPI20-V1,EPM12,HCP0605,DRQ127,DRQ125,EXL1V0503,WCLA,EXL1V0505,EPM78VX,RL1218,DRA,FPT705,HCM1A1105V2,MCL,LD,SDCL1V20,FPV1006,CPL,ECMT1V17,HCM1A1707V2,DRQ,ECMT1V24,ECMT1V20,HCM1A0805V2,FP1007R6,RL1011,FP1110V2,FP1110V1,LCPI,CTX01-19603-R,MFBA2V1608,HCM1A0503,UP0.4C,SD3114,MFBA2V2012,SD3118,MCLA,HCMA0503,SDCLA,HCM1A1104V2,CLH1110R1,HCM1A2213V2,LD1,HCM1A1707,LD2,MFBA,FPV1507,SD7030,FP1507R,SDCHA1V80,FP1007,FP1008R6,FP1008R5,DR73,FP1008R7,DR74,HCP0805,HCF1305,HCM1A1307V2,SD8350,HCM1A0503V2,FP1006,MPIA,FP1005,EXL1V1010,FP2207,FP0705,FP0708,EXL1V0705,FP0707,EXL1V0703,MFBX,HCMA,EXL1V0707,EXL
电路保护产品选择指南
描述- 本指南提供了电路保护产品选择指南，包括关键考虑因素、技术描述和产品选型表格。它旨在帮助用户快速找到适合其应用的适当保护解决方案。涵盖了过电流保护、过电压保护和静电放电抑制等技术，并介绍了各种产品的规格和应用。 **主要内容包括**： - 电路保护技术的概述； - 过电流和过电压保护解决方案； - 静电放电抑制方案； - 产品规格与选型指南； - 应用领域分析； - 常见电路威胁和保护措施； - 保护ICs的应用； - 变压器、气体放电管、TVS二极管阵列等具体产品的介绍； - Littelfuse公司的背景信息和优势。
型号- PXXX0SAMC,LS2406ERQ23,1812L,LVR,SPHV,30KPA-HR,456SE,456SD,15KPA,SP33R6-04UTG,345 SERIES,1210,ITV9550 30A,AQ24CANFD,SDP,AC,LS2406ERQ33,PXXX2AC,RUEF110S,MICROSMDCH,562 SERIES,AQ1003-01ETG,SDPXXX0T023G5,150603,800,801,802,804,806,807,BA,808,BB,PGB2,PGB1,P4SMA,TSM600,PTF070,MICROASMD,SC7520-08UTG,SC1103C-01UTG,PTF078,PTF077,559 SERIES,LS0504EVT233,PTF075,AQXXC-01LTG,810,811,356 SERIES,5KP,813,814,FB65,FB66,CA,SC7538-08UTG,CG,CH,PTF080,286677,PICOASMDCH,PXXX2AX,MINIASMDC,SMF4L,121004,B61089BDR,282008,121001,282007,820,121003,AK10-Y,821,121002,282002,823,824,282001,FB55,DA,828,DB,FB58,NANOASMDCH,820-20,830,831,834,835,PLED ULTRA LOW,101001,3453,3452,605,606,RKEF,607,PXXX2ACMC,LS12052BD33,AGRF,PTF0080M,B61089QDR,RUEF135V,850,851,852,3455,853,AHEF100,60R,617,618,GTCX36-XXXM-R05,FEMTOSMD,PXXX0Q12X,860,862,HA,PICOASMD,HB34,GTCX36-XXXM-R10,2920L,SP8008,AQ4337-01ETG,155 SERIES,P6SMB,803-01 SERIES,SLD,810 SERIES,870,PTF015,874,875,876,342 SERIES,877,5.0SMDJXXS-HRA,348 SERIES,30KPA,SM7,SM24CANB,SMCG-HR,TSV250,FC09B1606NL-0,SMD,SMF,TPSMB-VR,881,342006 W,35408 SERIES,OMN002,400,OMN004,885,35406 SERIES,881 SERIES,OMN006,646,405,647,V20H275AUTO,407,649,RXEF,101010,52100001009,AQ24CANA,AQHVXX-01LTG,656,101002,PXXXXDF,658,101003,5KPA-HR,5.0SMDJ,570 SERIES,AQ3530-01FTG,B-SERIES,662,1206L400SLWR,663,422,664,665,LA,SMBLCE-HR,L-SERIES,AQHVXX-01LTG-C,PTF050,SC1105-01UTG,PTF055,G-SERIES,435,437,438,ITV5432,A-SERIES,870 SERIES,PTF065,440,RGEF,437A,441,SP1103C,443,202,203,254 121,445,446,688,447,3453 SERIES,448,449,ULTRAMOV™ 25S,208,209,TR600,04450001,PTF030,438A,451,SRP,452,453,454,TSM250,PTF035,AUMOV®,213,456,215,821 SERIES,458,216,LV ULTRAMOV,459,217,218,SP3401,SP3400,AQ3522-01FTG,P6KE,TPSMC,FHN26G2,TPSMB,PTF040,TPSMD,LS2405IDD23,PTF045,460,461,5KPA-HRA,462,220,464,465,466,224,467,225,576 SERIES,468,254 101,229,BXXX0CX,SL0902A,102080,470,BXXX1UX,471,472,230,473,232,233,501A,476,234,235,477,MIDSMD,PXXX4UCMC,239,MHS,P4KE,850 SERIES,813 SERIES,AQ1205-01ETG,483,RA,485,487,802 SERIES,259UL913,ITV4030 22A,SP3530,SM20,345121,102064,345121 SERIES,254 201 - 208,251,SA,494,PLEDXUX,253,SD,SE,SG,SH,259,4.0SMDJ,SL1002A,SM,15KPA-HRA,15KPA-HR,GTCX37-XXXM-R10,102074,102076,102079,102078,NANOSMDCH,GTCA28-XXXM-R03,NY61AP,262,102071,263,265,266,3.0SMC,267,DSLP,268,269,520 002,520 003,520 004,SL1003A,520 005,1KSMB,345101,MLA,LS24062RQ23,1210L,AQ36CANA-02HTG,445073,MLE,MHP-TAM15,272,273,MLN,M-SERIES,274,E-SERIES,275,278,279,AQ3102-02HTG,MHP-TAC6,803-01,MHP-TA,285,AQ3041,SMBLCE-HRA,PLEDXUSXA,SP4322-01ETG,AQ3045,TP1.5KE,SP4208,SC1205-01ETG,820-20 SERIES,354 SERIES,CG33.0L,SP11XX,359 SERIES,ULTRAMOV25S,MS-SERIES,111 SERIES,100 SERIES,NANOSMDC,346877,PICOASMDCH010F-2,340 SERIES,AHRF300,AHEF,342025,342024,342021,ZA,AQ3400,XGD,FH604,AQ1250-01ETG,PXXX3ACMC,FH602,PXXX6U,SP4010,PLEDXN,SZD200,TPSMF-4L,HG34,PLEDXS-A,J-SERIES,824 SERIES,FEMTOASMDC,ITV5432 30A,AK6-Y,557 SERIES,SL1021A,SL1021B,SP4020,SP4022,SP4021,SMDCH,SP4024,281010,SP4023,PLED,MINISMDC,AXXXXUX6,254 011 - 008,SMTAK3,PXXX0Q22XLH,MHP-TAM6,AK15,445005,281007,154T,281008,281005,SC1004U-ULC-04UTG,AK10,1.5KE,AQ1005,51800001009,PXXXXS4X,ITMOV,354701 SERIES,483A,445004,LS05006VPQ33,SP4044,BXXX1UC4,SP4045,5200001,SMBJ,AQXX-01LTG,AQ7538-08UTG,SP1064E-04UTG,TCF250,ITV9550,SMTOAK2,SMAJ,AQ7520-08UTG,PXXX3AX,NANOASMDC,461E,811 SERIES,800 SERIES,157T,FC51,PXXX1U,PXXX1S,TRF250,SMBJ-HRA,SMDJ,CG3,SP3384NUTG,CG2,CG5,CG4,2205,CG7,B3XX4UX,CG6,VLP,VLR,0603L,PLEDXUX-A,SMCJ,PICOASMDC,LS0504EDD12,SMD2,PXXX0Q22C,GTCA28,GTCX35-XXXM-R05,SP00R6-01WTG,SMDJ-HR,SMDC,TMOV34S,AHRF,440A,AXGD10603NR,K-SERIES,TPSMC-VR,H-SERIES,SZ1SMB,SZ1SMC,SZ1SMA,219XA,AK20-Y,ITV9550L2030MR,ULTRAMOV,441A,824 - 20 SERIES,SZ1.5SMC,SP1250-01ETG,C-SERIES,SC1210-01ETG,TB-SERIES,0402L,ITV9550 45A,AHRL,DHB34,FHN26W,AUML,TP6KE,LTKAK3,AQRV05-4HTG,LTKAK2,72R,977,TLP,LTKAK6,AQ15CANA-02HTG,XTREME,PXXX3AC,SP3205-01ETG,501,3452 SERIES,504,505,506,507,GTCX23-XXXM-R01,508,8.0SMDJ,PXXX3U,100060,100061,122090,100062,100063,100064,100065,PXXX0SX,100066,SC1533-01LTG,SPHV-C,AHS,122093,150318,TS600,150319,150316,150317,150315,AQ3102-02JTG,150312,513,514,100058,100059,2016L,286377,SP4337-01WTG,122088,122087,122083,GTCX26-XXXM-R05,521,523,ITV4030,AK15-Y,100067,526,150322,527,PXXX2SXLH,SL1411A,AK1,AK3,AK6,VTP,422A,SMCJ-HRA,ASMD,C-III,SR70,0805L,860 SERIES,RHEF,SMF3.3,303,304,305,308,35409,35408,35407,35406,TPSMA6L,PXXX2SX,SP724,SP725,SC1115-01UTG,TSL250,LOW RHO,HMOV,SP723,SP720,SP721,LVR025K-2,312,313,30R,314,556,315,557,559,318,SLD6S,SP1305,SP712,LCE,560,562,322,564,324,325,326,328,SLD5S,CX-SERIES,345101 SERIES,570,571,332,SLD8S,PXXX0SD,576,TRF600,PICOSMDC,SP3522,3.0SMCJ,SZSMF,LS1205EVD33,SP1326,AQ12CANA-02HTG,340,150307,100,342,FHN20G,344,345,35407 SERIES,348,SMAJ-HRA,150300,AUMOV,LTKAK10,445 SERIES,SC1333-01ETG,RUEF,GTCX25-XXXM-R02,GTCX25-XXXM-R05,LS0502SCD33,111,354,356,52000001009,359,SP3420,150274,RUSBF,SP1003,SP3422,560 SERIES,PXXX0ME,564 SERIES,SP2555NUTG,51900001009,10207101009,520 101,369,SL1122A,571 SERIES,824 - 20,SP1233,AQ2555NUTG,SP1255P,600R,PXXX4UX,WB07B0606L
竞沃（TLC）公司及产品介绍
描述- 竞沃电子科技有限公司——电子保护元器件专业制造商
型号- 04 100,NSML 1206,06 110,USML 1210,TVS SERIES,TRB SERIES,TRA SERIES,TRC SERIES,PC01,PSMD 0805,UU918,USMD1210,PB01,ASML 0402,AB19U,FSMD 0603,12 100,AB11,TRM SERIES,TLV SERIES,T31-19-8,MSML 1812,AB20U,PSML 0805,06 100,TLS SERIES,NPH106060E18,TD SERIES,CH270060E18,TRF SERIES,TRG SERIES,T90-52,MSMD 1812,AB09,LSMD 2920,NSMD1206,NSML***L1505,12 113,FSML 0603,12 110,T20-10-10
【产品】次级反馈反激式AC-DC离线式开关电源控制芯片DK1203,全电压输入85V-265V，待机功耗小于0.3W
东科半导体DK1203是次级反馈反激式AC-DC离线式开关电源控制芯片。该芯片采用高集成度的CMOS电路设计，具有输出短路、次级开路、过温、过压等保护功能。该芯片内置高压功率管和自供电线路，具有外围元件极少，变压器设计简单等特点。
DK1203 12W 交直流转换芯片
描述- DK1203是一款高性能的反激式次边反馈开关电源控制芯片，适用于AC-DC转换。它具备全面的智能化保护功能和多种脉冲功率调节模式，实现低待机功耗和高效能。芯片内置高压功率管和自供电线路，简化了外围元件和变压器设计。
型号- DK1203
电子商城
现货市场
服务
可定制变压器电压最高4.5KV，高频30MHz；支持平面变压器、平板变压器、OBC变压器、DCDC变压器、PLC信号变压器、3D电源、电流变压器、反激变压器、直流直流变压器、车载充电器变压器、门极驱动变压器等产品定制。
最小起订量： 100000 提交需求>
提供辐射发射测试、传导发射预测试、EMI噪声频率扫描服务。消费电子辐射发射预测试频率范围30MHz-1GHz、 车载电子9KHz-3GHz，并针对问题给出EMC整改方案。支持到场/视频直播测试，资深专家全程指导。
实验室地址： 深圳 提交需求>
授权代理品牌：集成电路
授权代理品牌：分立元件
授权代理品牌：接插件及结构件
授权代理品牌：部件、组件及配件
授权代理品牌：电源及模块
授权代理品牌：电子材料
授权代理品牌：仪器仪表及测试配组件
授权代理品牌：电工工具及材料
授权代理品牌：机械电子元件
授权代理品牌：加工与定制
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