【经验】电源适配器的辐射发射分析及解决方法

时间： 2021-06-16 来源：韬略科技

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电源适配器是小型便携式电子设备及电子电器的供电电源变换设备，一般由外壳、变压器、电感、电容、控制IC、PCB板等元器件组成，它的工作原理由交流输入转换为直流输出；按连接方式可分为插墙式和桌面式。广泛配套于安防摄像头，机顶盒，路由器，灯条，按摩仪等设备中。适配器本质上就是一个开关电源，因此EMC问题也越来越受到大家关注，接下来重点分析辐射干扰产生的原因和处理措施。

辐射干扰产生及解决方法

辐射干扰的测试包括电场发射和磁场发射，电场发射由du/dt产生，磁场发射由di/dt产生。注意：空间电容是电场发射的通道，共模电流可以产生相当大的电场发射。

（一）电场发射

图1：电场发射

1、电场发射主要产生于以下部分：（1）初级和次级电压变化，其中初级绕组电压变化的幅值大，对于电场发射起主导作用。（2）磁芯也是一个电场发射源。

2、解决方法在系统的PCB底层铺铜皮或额处加一块铜皮或单面板，可以有效的减小电场发射和共模电流。

图2：减少电场发射

（二）磁场发射

1、磁场发射分析一高di/dt 的环路通过环路的寄生电感产生磁场发射，次级侧的电流变化幅值大，对于磁场发射的起主导作用。磁场发射形成的方向见图27所示，方向符合右手定则。

图3：磁场发射

解决方法：高di/dt环路的寄生电感随环路面积增大而增大，因此磁场发射对于PCB的设计非常关键。次级侧的电流环面积要尽量的小，布线要尽量的短粗。

2、磁场发射分析二，变压器的杂散磁场也是一个磁场发射源，其主要由变压器的气隙产生。E型磁芯在两侧开气隙时杂散磁场大，在中心柱开气隙时杂散的磁场小。

图4：输出线发射

解决方法：在变压器的最外面包裹铜皮，铜皮两端短接，用导线连接到冷点，可以减小杂散的磁场。因为杂散磁场在铜皮中产生涡流，涡流反过来产生磁场阻碍变压器杂散磁通的外泄。输出棒状及鼓状的差模电感如同一个天线产生大的磁场发射。使用前述的相关的缓冲吸引电路可以减小相应的磁场发射。

（三）电缆的天线效应

1、产生模型充电器要带长的输出线进行测试，长的输出电缆也如同一个天线，并将共模电流放大，从而形成较大的共模电场辐射。

图5：线缆的天线效应

2、解决方法可以通过改变变压器的结构进行抑止，最好增加输出共模电感。才能有效的减小在30~50M间的电场发射。

共模电感设计：

图6：共模电感

（1）当有共模成分流过共模电感时，根据右手定则，会在两个线圈形成方向相同的磁场，相互加强，相当于对共模信号存在较高的感抗；

（2）当有差模成分流过共模电感时，根据右手定则，会在两个线圈形成方向相反的磁场，相互抵消，相当于对差模信号存在较低的感抗。

对于电源适配器的空间辐射，本文分析产生原因及解决方法，希望对于大家设计和整改有所帮忙，提前考虑空间辐射，解决起来才能事半功倍！

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本文由翊翊所思转载自韬略科技，原文标题为:电源适配器的辐射发射分析，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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应能微 MOSFET/TVS/电源管理芯片(PMIC)选型指南

目录- 公司简介 USB PD 快充/储能逆变DC-DC/电源适配器电池管理/电动工具电动车/无人机/吸尘器手机/平板/学习机 TWS耳机/音箱智能穿戴手表/手环工控/笔电/电脑机顶盒/路由器/WIFI6 安防摄像头/球机/交换机智能电表/水表/气表/热能表电子烟/广告机/电子笔/智能门锁 TVS封装电源管理芯片 TVS 应用设计

型号- AU1271P6,AU4581D3,APC2801 SERIES,ASM12,SLVU2.8-4,CM2302B,CM2302A,CMN3002TF5,AU4581D3H,SMF15A,AU0571P1A,AR0544P5LV,AU2424P5LV,AU1281D1F,AU0521D5,CM65R400XF,AU1221P1,CM60N10AGB,AR0511P1LV,CM2301B,CM2301A,AU2481D1F-T,AU2421P1,AU4891P1,SMCJ50CA,AU0591P1,CM2312J,AR0552S2,CMN6002GF5,AU2471D1F-T,CM20N65TP,AR0524P5,APO3605A,SMAJ15CA,SMAJ26A,AU0771P6,AU0541P1,AU0541P0,AR3341P0SC,APO2003F,CM1602A,AR0502S2,APO2003H,AR0502S1,AR6051P1,APO2003D,AU0581D3,ASD05,APO3105A,CMN1002PGLA,AR0502S5,ASD12CL,SMAJ26CA,SMAJ15A,APC2801,CM20N65TF,AU056P1,AU1501P4-3,CM4N65BTF,AR2411P1,AU0501P4-3,CM4N65BTP,AR0508PBA,AU1271D3,AU1201P4-3,CMN4002F5,AU0521P0,CM180N10AGB,CM80N10GF5,CM2305TW,CM5N65TF,CM5N65TP,CMN3003GF5,AR3324P5,AU0581P1A,AR1811P1A,CMN3004AF5,AU0521P4-3,AU0561D5,SMBJ15CA,AR0524P5B,AR0541P0S,CM7N65TP,AR3621P0,AR3621P1,AU0581P1H,AR0524P5L,AU1811P1,AR3621P6,CM65R550D,CM65R550F,CM7N65TF,APO3605,AR1811P0A,AR0541P1,CMN6004GLA,CM3401P,AU0521PZ,AU0701P4-3,AR1821P1,SMBJ26CA,CM65R550FF,ASD05C,APL0501A,APL0501B,AU0781D1F,AU0581P6,SMBJ26A,SRV05-4L,AU0581P1,AU1571P6,CM65R550FP,AR3311D3U,AU2804S8,CMN301R5F5,AR0504S2L,AR0504S2,AR0504S2A,ASRV05-4,SMBJ15A,AU0701P1,ASM24CLV,AR0521P0LV,ASM05C,AR0504P3,AU4501P4-3L,CMN3013F3D,AR5051P1,CM2302BH,AU0571D1F,CMN1003GXP,CM80N10LGF5,AU0791P1,CM65R310XF,AU0561P0,AU0561P1,CMP3007F5,CM3400,AR2421P1,AU0771D3,AR2421P0,APL0501 SERIES,AU0761D1F-T,CM65R310XP,CMP3007F3,AR0521D5,AU0511P0,AU0521M1,AU0591P1A,CM180N10GP,CM3407,AU0971P6,S4MF7.0CA,AST24CL,AU6351P1,CM65R550P,AU0771D1F,CM65R550U,AR0511D3,CM2N7002D,CM10N65TF,SMF15CA,CMBSS138,CM65R030FZ,CM4407,AU1571D3,CM10N65TP,AR0541P1SC,CMN6003GLA,ASM24CH,AU0581D3H,ASD05CL,AR3304P5,ASM24CL,AU4581P6H,CM65R640XP,AU3321P0,SMF7.0CA,AU2461D1F-T,APL0501,AR1521P1,AU3321P1,AR0521P1,CMN3010F3,CM65R640XF,CM1601A,AR0521P0,CM65R180F8,AU4501P4-3,AU4581P6,AU1271D1F,AU4581P1,CM60R030FZ,CM3134AK,AR0502S1A,CM65R175P,AU4571D3,CM1662,AR0541P0SC,AR0506PAL,SRV05-4,ASM24C,APO2003,APC2801A,AR3382P6L,APC2801B,SMF7.0A,CM175N10GLB,ASM12H,CM3400NJ,APO3605 SERIES,AU0561M1,AU2401P4-3F,AU2401P4-3D,APO2003 SERIES,CM1623T,AR3311D3,AU1261D1F-T,CM3134BT,AU0721P1,CMN3006F3,AU0721P0,AR1211D3,AR6061P1,CM15N10U,AU4521P4-3,CMN3003TF5,AR3311P0LV,CM65R400XP,AU2401P4-3,AU4581P1H,S4MF7.0A,ASR05,AU0721PZ,AU3361P0,ASM712H,AR3321P0,AR0511P0LV,AR3321P1,SMDJ50CA,AU0701P4-3F,AR3304P5J,AU0781P1,AR1255P4,CM12N65TP,AR0521P1LV,ASM712,AU3361P1,CM12N65TF

选型指南 - 应能微 - 2023/10/27 PDF 中文下载

【选型】国产降压电源芯片SGM61133助力机顶盒，可P2P兼容MPS的MP1652/MP1653

在机顶盒电源部分设计时，外部适配器输出DC12V，需要降压DCDC转为5V为后级供电。之前不少厂家会选择MPS的MP1652或MP1653，但随着国产化低成本压力越来越大，急需一颗高性价比替换料。本文推荐国产圣邦微降压电源芯片SGM61133做替换。

器件选型发布时间 : 2020-10-21

辰达行多面手DSK14肖特基二极管：电源、稳压器和整流器的全能助手！

MDD辰达半导体推出的DSK14肖特基二极管性能卓越，兼具小型化、低功耗和高效率等优势。它具备出色的高正向浪涌电流能力，特别适用于低压、高频逆变器和极性保护等应用。其电学特性表现优异，包括直流反向电压40V、正向电流1A、正向涌浪电流25A、反向电流300μA以及正向电压0.55V。

产品发布时间 : 2024-09-07

东科半导体是专注高频高效绿色电源IC和大功率电源IC的设计、生产、制造和销售的公司，公司主要产品有AC-DC，同步整流IC、触摸感应芯片，精密稳压芯片等，主要应用于电池充电器、智能家电、AC/DC 电源适配器、LED照明、移动数码、工业等领域。

同步整流芯片 AC-DC 触摸感应芯片精密稳压芯片氮化镓管理芯片

授权代理商 - 世强先进（深圳）科技股份有限公司线上商城技术资料

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金誉半导体（JINYU SEMICONDUCTOR）/迪浦电源管理芯片和MCU产品选型指南

目录- 公司简介 AC-DC电源管理系列车充电源管理&DC-DC降压电源管理&DC-DC升压电源管理系列 LDO线性管理&锂电保护系列锂电二合一&电池充电管理系列电池充放电管理&MCU产品系列双极锁存性霍尔开关低压微功耗HALL开关&快充协议产品系列 MCU部分产品封装

型号- PT8300,PT8261,PT2280,PT2281,DW01A,PT2712,PT2710,PTB153CX,PTM172SX,PT2711,PT4057,HT75XXM,PTB0131XXS-S16B,PT7203,PT3520,PT1812B,PTB152SX,PT1812A,HT75XXH,PTB251CX,PTB232CX,PTB133SX,PTB156SX,PT3515,PTB132BSX,PT6505,PT6503,PTM232CX,PT248,PT4054B,PT255,PT6020,PT253,PT8201,PT254,PT6023,PT8200,PT8035 3-515,PT2580,PT3773C,PT3773A,PTB131CX,PTB150CX,X,PTB232SX,PTB0232XXS-S14,PTB15A,PT258,PT5202,PTB271CX,PTB153SX,PT7200A,PTB134SX,PT7200B,PT7200C,PT7200D,PT6648,PT6601Q,PT6523,PT2005A,PT2005B,PT2005C,PT6002,PT6003,HT73XX,PTM151CX,PT2360,PTB0154BXXS-S14,PTB271SX,PT2358,PT437B,PT2783A,PT2783B,PT437,PT438,PTB131SX,PTB0131XXS-D16B,PTBO132XXS-S16A,PTB150CS,PTB234CX,PT2773C.,PTBO234XXS-S20,PT2502,PTBO132XXS-S14,PTF89S003X,PT8206,PT8203,PT2500,PT8202,PT8001,PT6220,PT8002,PT6221,PTM154CX,PTB0150XXS,PT2535,PTM173SX,PT6219,PTM154SX,PTB0150XXC,PT2773A,PT2773C,PT2773D,PT2010,PTB234SX,PT6212,PTB156CX,PT188,PT6291,PTB171BSX,PT181,DW01AP,PTBO234XXC-D20,PTBO232XXC-S16A,PT2008,PT6608,3TB154CSX,PT6206,PTB0232XXC-DK,PTB150G,HT75XX,PT4302

选型指南 - 金誉半导体,迪浦 - 2019/12/17 PDF 中文下载

竞沃（TLC）电路保护选型指南

描述- Founded in 2011, TLC is a Specialized and New Enterprise, the first surface-mounted resettable fuse manufacturer in China, the leader of PPTC industry, and a professional manufacturer of circuit protection components. Its main products include PPTC, SMD Fuse, TVS and ESD, NTC, WSF three-terminal Fuse, EVFuse and the other protective elements.

型号- PSMH0805 SERIES,LSML2920,AB20,EVR500-18,5HVB SERIES,F06F SERIES,EVF500-38,JWEN3,JWEN2,JWEN06,TSQF07 SERIES,JWET143-SERIES,EVF1000-25,F12TH SERIES,TDH SERIES,P6KE SERIES,TAB SERIES,AB19,F12FH,30KP SERIES,TA3VT,USMD1210 SERIES,P4KE,EVF500-30,AB10,AB11,AB29 SERIES,10HVA SERIES,P4SMA SERIES,TLV SERIES,10HVC SERIES,TDF SERIES,EVF500-25,TAF SERIES,P12S,TA3VF,EVS750-3624 SERIES,USML1210,EVS1000-2039,F06F_TH,JWEN2510,WTHC SERIES,5.0SMDJ SERIES,20KP,TD SERIES,AB29,AB10 SERIES,AN478 SERIES,EVR500-30,EVS750-4533,TB SERIES,EVF1000-30,20KP SERIES,SMCJ SERIES,F12FH SERIES,SMDJ,1.5SMC,EVR750-30 SERIES,EVR500-40,6HVD SERIES,EVR1000-40,10HVE SERIES,EVR500-40 SERIES,5KP,EVR250-30 SERIES,1.5KE SERIES,TA2VT,EVF500-51,F06T SERIES,SMFJ SERIES,EVR500-18 SERIES,6.6SMDJ SERIES,SMCJ,JWET553-SERIES,TSQF12 SERIES,F12TH,JWEN16,TA2VF,22HVA,F12T,NT52 SERIES,1.5SMBJ SERIES,JWET23-SERIES,SMF4J,NSMD1206,1.5SMBJ,ANT SERIES,EVR250-18,ANMZ SERIES,ANMZ,5HVB,5HVA,EVR750-40 SERIES,EVS750-3048 SERIES,EVS1000-4533 SERIES,SM6S,AB29N,30KP,P6SMB SERIES,JWET353-SERIES,F04F,15KP,TRM SERIES,F12 SERIES,TRG SERIES,AB11N SERIES,EVF500-25 SERIES,AB19.N SERIES,EVR750-40,AB09 SERIES,MSMH1812 SERIES,NT55 SERIES,WSFB,10HVF,WTHC,WSFC,10HVE,EVS1000-3048,WSFD,EVR1000-40 SERIES,EVS1000-2039 SERIES,NSMH1206,TRE SERIES,SQT L SERIES,SMFJ,EVS500-3624,JWEP8,10HVB,JWET26-SERIES,10HVA,AN498,10HVD,10HVC,JWET143,NT55,FSML0603 =,EVS750-2039,NSML1206 SERIES,EVR750-18 SERIES,NT51,MSML1812,NT52,MSMD1812 SERIES,EVF750-51,EVS500-4533 SERIES,JWET23,NT58 SERIES,NT58,F06F_TH SERIES,NSML1506 SERIES,5KP SERIES,TCSM SERIES,SM8S,8KP SERIES,FSMD0603 SERIES,SQT M,EVR250-40,TCSP SERIES,SQT L,TAL SERIES,3KP,JWEN2-SERIES,TLS,F06F,TA3VF SERIES,TCSA,PSML0805 SERIES,FSMD0603,EVF750-51 SERIES,TLV,WSFD SERIES,JWEN2510-SERIES,TCF SERIES,6HVA,F12,6HVC,EVS500-2039 SERIES,NSML1206,TCSMA,6HVB,PESD0402,JWEN16-SERIES,TRB SERIES,EVR250-30,P4KE SERIES,P8S SERIES,SM6S SERIES,8.0SMDJ,EVS500-3048,5HVA SERIES,JWET363,F12F_TH,EVF750-25 SERIES,EVF750-30,PESD0603 SERIES,EVF1000-25 SERIES,AB19.N,AB19 SERIES,EVF750-38,NSMH1206 SERIES,8.0SMDJ SERIES,SMF4J SERIES,6HVE,6HVD,ZSMD0201,MSMH1812,JWET563-SERIES,JWET353,TCST SERIES,TCSF,6HVC SERIES,6HVA SERIES,F06T,SQT M SERIES,FSML0603 SERIES,TCSP,EVF1000-30 SERIES,TCSM,JWET26,JWED5,TA2VF SERIES,TABF SERIES,EVF750-25,JWED9,TCST,EVS750-3048,EVS500-3048 SERIES,EVS750-2039 SERIES,JWED1,JWEN06-SERIES,PSML0805,F06FH SERIES,EVF750-30 SERIES,TCSF SERIES,SM8S SERIES,EVR750-30,NTS,EVS1000-3624 SERIES,JWED5-SERIES,6HVE SERIES,JWEN3-SERIES,PSMD0805 SERIES,TABF,EVF750-38 SERIES,EVS1000-3048 SERIES,10HVF SERIES,LSMD2920 SERIES,JWED9-SERIES,TCH SERIES,JWED1-SERIES,USML1210 SERIES,MSMD1812,TBF SERIES,10HVB SERIES,P12S SERIES,5.0SMDJ,WSFB SERIES,TA SERIES,EVS750-4533 SERIES,TEF SERIES,P8S,MSML1812 SERIES,PESD0603,EVS1000-3624,AN478,EVR750-18,SMBJ SERIES,TAB,TE SERIES,EVF500-51 SERIES,TAF,AB20 SERIES,EVS500-2039,TAL,F06FH,JWET563,TRA,LSMH2920 SERIES,TRC,TRB,TRE,EVS750-3624,TRG,TRF,EVS500-3624 SERIES,TRA SERIES,ASML0402 SERIES,TRM,F04F SERIES,AN498 SERIES,EVR500-30 SERIES,WED3,USMD1210,TA3VT SERIES,TBF,LSMD2920,EVR250-40 SERIES,8KP,15KP SERIES,PSMH0805,USMH1210 SERIES,SMA6J SERIES,JWET553,NSML1506,EVF500-30 SERIES,AB20U,WSFC SERIES,NSMD1206 SERIES,ASML0402,NT51 SERIES,EVS1000-4533,EVF500-38 SERIES,TRC SERIES,TA2VT SERIES,TCF,ANC,SMAJ SERIES,1.0SMBJ SERIES,TCH,TCSMA SERIES,ZSMD0201 SERIES,AB29N SERIES,ANT,WED3-SERIES,JWET363-SERIES,F12T SERIES,EVR250-18 SERIES,NTS SERIES,JWEN2010-SERIES,AB20U SERIES,TSQF07,LSMH2920,LSML2920 SERIES,TDF,TCSA SERIES,TDH,PSMD0805,1.5KE,ANC SERIES,AB11N,USMH1210,TLS SERIES,10HVD SERIES,P6KE,3KP SERIES,JWEP8-SERIES,JWEN2010,PESD0402 SERIES,6HVB SERIES,TRF SERIES,F12F_TH SERIES,6.6SMDJ,TEF,AB09,AB11 SERIES,SMDJ SERIES,TC SERIES,22HVA SERIES,TSQF12,1.5SMC SERIES,EVS500-4533

选型指南 - 竞沃 - REV.1 - 2024/6/20 PDF 中文下载

DK1203 10W 离线式开关电源

型号- DK1203

数据手册 - 东科半导体 - 版本：1.0 - 2022 年 6 月 PDF 中文下载

【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。

新产品发布时间 : 2021-08-16

CoreGaN：立足消费，走向工业

型号- CE65D245T30BS,CE65D550T30BS,CE65E300T30BS,CE65D100T30BS,CE65E160DNHI,CE65D070T30BS,CE65H600TOEI,CE65H900DNZ,CE65H160TOAIF,CE65E300DNYI,CE65H070TODI,CE65D800T30BS,CE65H600DNZI,CE65H110TOAI,CE65D150T30BS,CE65H270TOBI,CE65H600TOAIF,CE65E160T30BS,CE65H270TOAIF,CE65H270DNGI,CE65H900TOEI,CE65H110DNDI,CE65H160DNGI,CE65H270DNZI,CE65H160DNZ,CE65H070TOCI,CE65E160DNYI,CE65H270TOEI

商品及供应商介绍 - CORENERGY - 2024/1/30 PDF 中文下载

三端稳压器的特点和应用

三端稳压器是一个集成电路，配有输入、输出和接地三个引脚，用于将波动的输入电压稳定转换为设定的输出电压。它具有高稳定性、低噪声输出，并集成了过热、短路及过流保护功能，确保设备安全。设计简单且易于使用，它广泛应用于电源适配器、计算机硬件、通信设备和消费电子产品中，确保这些设备能获得稳定的电源供应，提高性能和可靠性。

产品发布时间 : 2024-08-09