【应用】采用片式压敏电阻的PoE供电防雷防护方案，脉冲电流可高达127857W，瞬间反地线脉冲电压小

时间： 2021-08-14 来源：顺络

技术问答

在PoE供电的案例中，很多时候PD设备是处于室外环境，比如IP camera，功率AP等，PoE端口雷电防护措施是必须认真对待和设计的事项了。

背景和开发目的

PoE（Power over Ethernet）也称为以太网供电，是一种可以通过双绞线来传输电力到装置上的技术。以太网供电技术的出发点是让IP电话、路由器、网络摄像头等小型网络设备，可以直接从以太网双绞线获得电力，而无需单独铺设电力线，以简化系统布线，降低网络基础设施的建设成本。PoE的这些优点使其得到快速推广，如今在大部分的交换机，服务器等都集成PoE接口，其在通讯、物联网、安防等领域得到广泛应用。

PoE的具体规范和接线如下图，IEEE80 2.3af允许两种用法：

1. 如图1，应用空闲脚供电时4、5脚连接为正极，7、8脚连接为负极。

图1

2. 如图2，利用信号线（1、2、3、6）同时传递数据信号和48V的电源。应用数据脚供电时，将DC电源加在传输变压器的中点，在这种方式下线对1、2和线对3、6可以为任意极性。传输数据所用的芯线上同时传输直流电，其输电采用与以太网数据信号不同的频率，不影响数据的传输。

图2

按照IEC61000-4-5要求，端口PoE供电必须进行共模、差模雷电及浪涌防护，满足客户整机技术要求。

方案和特点

目前主要防雷器件有压敏电阻、TVS二极管、气体放电管等，它们的特性如下：

其中的片式压敏电阻 SDVL系列是顺络电子开发专门用于电源端浪涌防护的器件，相比目标TVS管，具有过流能力强、体积小、性价比高等优点。

具体方案

目前较为严格的雷电防护需求为：

（1）共模防护：10/700μS：4KV/100A(40Ω) or 8/20μS 700A

（2）差模防护：10/700μS：2KV/50A(40Ω) or 8/20μS 350A

推荐方案：如下图3当中的①和②分别是采用空闲线供电（①）和信号线供电（②）的两种PoE连接方式，推荐PSE和PD端分别进行雷电防护，PSE端可以根据实际情况进行雷电防护。

图3

具体方案-方案A：

具体方案-方案B：

方案分析：

1. 共模防护：

（1）在满足PoE 线路雷电防护标准的条件下，压敏电阻相比气放管，具有更高的性价比，是电源线路雷电防护及电源线路浪涌防护的主要元件。而气放管是数据传输线路雷电及浪涌防护的主要元件。

（2）由于压敏电阻能够吸收并衰减脉冲电流的能量，脉冲能量在地线（PE）的产生的瞬态电位升高远低于气体放电管（气放管不能吸收并衰减脉冲能量），因此压敏电阻对IC 的瞬间反地线脉冲电压影响很小。

（3）气放管的启动电压太高，而且启动电压的差异较大，其对线路保护效果有一定的分散性和风险。

2. 差模防护：

（1）对于既定的电源线路，压敏电阻的最大脉冲电流远大于相应的TVS，为满足产品雷电标准要求，TVS的性能参数需要更高，方可满足测试标准，而大功率TVS 价格很高。

（2）若受保护IC 的耐受脉冲电压能力较差，则采用压敏电阻保护效果有时候不甚理想，可在压敏电阻前端线路加电阻或电感元件以改善；若改善不良，则选用适当的TVS（TVS 的最大限制电压较小）。

以上方案已经得到多家IP Camera 厂家的认证和采用。由于方案的实际防护效果和整机电路环境有较大关系，请整机厂商试用该方案时如有异常请与世强联系。

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本文由奶爸工程师转载自顺络，原文标题为:新型高性价比PoE供电防雷防护方案，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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优恩半导体（UNSEMI）保护器件产品选型指南

目录- Electrostatic Discharge Protection Devices Transient Voltage Suppressors Thyristor Surge Suppressors Gas Discharge Tube Spark Gap Protectors Multilayer Chip Varistor Polymeric Positive Temperature Coefficient Thin Film Common Mode Filter Silicon bilateral voltage triggered switch RJ45 Network connectors

型号- 15SMBJ78CA,SMAJ6.0CA,SMAJ40CA,SMBJ20A-AT,SM8Z20A,15KP58A,UN2K8-400SMD,SMD1206-350,SMDJ78CA,UN3E8-75HM,P0300SC-2L,ESD05V02D-CP,UN3E8-75HP,TPSMB30CA,SMDJ16A-AT,15SMBJ7.5CA,UNC-301N-SMD,TPSMCJ18CA,PESD0603E12V,UN6-200,05D511K,20D241KYC,5.0SMDJ85C,SMDJ36CA-AT,5.0SMDJ85A,K2200G,UN0402E18V120P,SMCJ100CA,ESD15V52D-LCF,5KP30C,5KP30A,SMF120CA,SMBJ150CA,SMDJ170A,SM8Z33CA,TP5.0SMDJ28CA,53D681K,SMDJ170C,3KP80CA,UN2K8-800L,UN135-250,SMCJ30C,32D122K,SMCJ30A,UNA-471M,SA180C,SMAJ70CA-AT,K0900G,SM8Z24A,SA180A,4.0SMF5.0A,15KP54A,20D781KJ,SMF190A,P6KE8.2CA,TPSMA82A,P4KE180A,P4KE180C,14D181KSC,ESD24V26T-5L,20D331KYC,P4SMA82CA,SMF3.3A,TP5.0SMDJ15CA,SM8Z22A,MCM3216B SERIES,SMDJ160CA,SMBJ400CA,SMCJ80CA,SMD1812-200-24V,PXXXXLB,PXXXXLC,P6SMB51CA,PXXXXLA,ESD24V26T-4L,4.0SMF12CA,TPSMB43CA,ESD0402-240E2R5,SMDJ400A-AT,TPSMB110CA,ESD08V88D-C,SMCJ220CA,5.0SMDJ64CA-AT,5.0SMDJ80A,SMCJ440A-AT,10SMBJ40CA,5.0SMDJ80C,P4KE SERIES,SMD1206-075-16V,TP5.0SMDJ33A,15KP22CAS,UN2E8-90MSMD,5KP36C,5KP36A,UN135-200,SMCJ170CA-AT,UN3220-511H,ESD05V88D-2LA,SMAJ18CA,SA17CA,UN3E6-470MM,1.5KE170CA,25D122K,5KP90CA,5.0SMDJ160CA-AT,TPSMCJ40CA,SMF,TPSMAJ13CA,UN3E5-XXXL,3KP45CA,07D301K,10SMBT28A,SMD1210-075,UN1812-120H,TPSMBJ20CA,3KP58CA,K2600SD1,TPSMBJ40A,1.5SMC440A,UN3E6-350MM,07D431K,10D471KJ,UNS3220-180K,UN2E8-600MSMD,P6SMB520A,UNS2K SERIES,UN1812-121H,20D911KJ,SMAJ440CA-AT,20D511KYC,P6SMB16CA,P6KE500C,UN250-250,P6KE500A,SMBJ90C,15SMBJ9.0A,UN2220-470HS,ESD12V12D-A,SMBJ90A,ESD12V12D-C,UN3E8 SERIES,SMBJ12CA,TP5.0SMDJ30A,TPSMAJ26CA,UNA SERIES,SMD1210-050,PESD0603E18V,SMDJ11CA-AT,UNS3220-181K,SMBJ5.0A,SMBJ350CA-AT,SMBJ5.0C,TCF03025FH35002A,UN1206-270H,SMD0805-075,UNC-SMD SERIES,20D220K,SMBJ9.0,ESD15V52D-LAF,5.0SMDJ180A-AT,PESD0603E15V,SMD1210-020,UN1210-760H,UN3E8-75HSMD,6.0SMAJ,UN0402E SERIES,UN6-250,TP5.0SMDJ36A,SMBJ58A-AT,SMDT58CA,P4SMA47CA,ESD24V32D-C,UN3E6-230MM,ESD24V32D-A,SMD1210-035,UN2E5-XXXLL,ESD0402-5R5E500,SMD1210-005,07D560K,SMBJ85A-AT,20D,UN250,PXXXXDM,P4KE400A,MCM3216B121,P4KE400C,PXXXXTB SERIES,40D431KJ,ESD03V32D-LCD,10D101K,TPSMBJ33CA,ESD03V32D-LCA,SMCJ90CA-AT,SMD0805-050,ESD03V32D-LCC,07D561K,10SMBJ18CA,TPSMDJ12CA,P6KE27CA,SMBJ30CA-AT,SMCJ120A-AT,PXXXXEC,5KP33A,SMCJ16CAS,UN1210-200BSMD,PXXXXEA,10D102K,34S1000J,PXXXXEB,14D911K,20D221K,SMD1210-150-12V,07D821KJ,SMD1210-010,5KP33C,TPSMA6J13A,20D470KJ,UN2E8-150M,SMDT45CA,15SMBJ17CA,TPSMA6J13CA,SMAJ14A-AT,10SMBT33A,SMD0805-035,ESD05V32D-A,UNB-201N-SMD,TPSMA6J14A,SA9.0,UN3E6-350M,POE SERIES,UN135-1100-S,TPSMBJ33A,SMD0805-020,UN3E8-75H,10D112K,UN135-1100-C,UNB-181N,ESD05V88D-CDN,UN2E8-150H,14D561K,TPSMB91CA,TPSMAJ SERIES,TPSMA6J15A,ESD08V52D-HA,TPSMBJ36A,SMCJ7.5C,SMCJ7.5A,SMAJ400A,SMF19CA,UN3E5-150L,SA90A,UN1812 SERIES,SA90C,10D241K,SMD0805-010,10SMBJ180A,14D431K,LCDA05C-8,LCDA05C-4,25D,P6KE220CA,SA40CA,ESD05V32D-C,HCM1012GD900B05,10SMBT7.5A,ESD05V88D-CBP,10D821KEC,SMD0805-005,UN2E8-150ML,UN1812-760HS,ESD05V88D-CBD,SMCJ64A-AT,SMBJ48CA-AT,P3800TB,TPSMBJ30A,P3800TA,SMDJ90,UN3220-471HS,P6KE100CA,5KP28C,SMDT7.0A,P6SMB SERIES,5KP28A,14D681KJ,TPSMA100A,P3800SC,P3800SB,SMDJ85,6.0SMAJ54CA,ESD30V12D-C,P3800SA,ESD30V12D-A,SMDJ80,SMAJ8.5CA,SMAJ180C,SMAJ180A,UN2E5-90LSMD,TP5.0SMDJ40A,SMDJ75CA-AT,20D122KJ,10SMBT36A,ESD3.3V04D-LC,SMAJ350CA-AT,14D361KSC,5.0SMDJ220A,SMDJ78,UN30-160,UN16-900,ESD05V08P-LC,SMDJ75,25D121K,5KP8.0C,14D561KJ,SMDJ70,5KP8.0A,UN2K8-450L,1.5SMC10A,UN0805-420H,TPSMA6J26CA,SMDJ16CA,SMCJS SERIES,14D560K,SMBJ130C,SMBJ130A,5.0SMDJ350A,SMDJ64,SMDJ60,34S210J,5KP120CA,ESD12V52D-CF,30KP120A,UNS3220 SERIES,SMDJ43A-AT,SMDJ58,UN30-185,SMDJ54,P6KE75,10SMBJ7.0CA,SMDJ51,UN2E5-3600LL,20KP132A,SMAJ160CA-AT,10SMBT7.0A,UN2K8,P6KE62CA,UN30-135,SMDJ48,P6KE68,SMDJ45,SMDJ43,UNB-401M,SMDJ40,TPSMA36CA,P6KE82,ESD15V02D-CKN,5.0SMDJ78C,SMCJ7.0C,SMDT7.5A,5.0SMDJ78A,SMCJ7.0A,SMDJ51CA,5.0SMDJ48CA,UN111B339HWA1DFL,15KP51A,TPSMDJ,SMDJ36,SMDJ33,25D751KJ,P4SMA220A,SMDJ30,10SMBJ60A,P6KE91,KB-380,SM8Z26A,ESD3.3V12D-A,ESD3.3V12D-C,SMD1812-200-16V,TPSMCJ,UN2H8-5000LL,SMDJ28,5KP8.5C,SMDJ26,5KP8.5A,SMDJ24,UN2K8-600,SMDJ22,SMDJ20,UN1210-151H,SMD0805-110-12V,SMBJ11A-AT,07D331KJ,ESD0402M,UN16 SERIES,14D751KSC,SMD1812-300-16V,SM8Z28A,SMDJ19,ESD12V52D-HA,SMDJ18,SMDJ17,SMDJ16,TPSMB10J16CA,SMDJ15,TPSMBJ,SMDJ14,TPSMB56CA,SMDJ13,SMDJ12,SMDJ11,SMDJ10,SMCJ36A,SMD0805-010-30V,P6KE30,32D621KJ,SMCJ36C,SA190CA,5.0SMDJ75C,5.0SMDJ75A,UNA-SMD,15SMBJ160CA,SMF54CA,TPSMA6J18A,P4SMA91A,P6KE27,TPSMAJ,P6SMB170A,P0300DM,UN1812-390HS,P6KE24,P6KE22,P6KE43,SMCJ45CA,UN3E8-200HSMD,UN0603E,P6KE75CA,P0300EA,P0300EB,P0300EC,P6KE39,TPSMA6J19A,UN2H8,P6KE36,TCF03025U12002A SERIES,P6KE33,10SMBJ64A,SMCJ58CA,P6KE51,TPSMBJ110CA,SMDJ180CA-AT,25D511KJ,SMD1206-300,SMDJ7.5CA,TPSMA75A,UN1812-270HS,5.0SMDJ17A-AT,1.5KE18CA,14D201KJ,UN30-110,BLC03C-4,UN2K8-350L-2,5.0SMDJ70CA,UN2E5,UN2K8-350L-1,SMCJ33A,P6KE47,SMCJ33C,TPSMA6J16A,UN2E8,UN2E8-150HL,P4SMA350A,P6KE62,P4SMA6.8CA,ESD03V23T-LC,ESD03V23T-LA,ESD08V52D-A,15SMBJ180A,14D301K,10SMBT30A,P6KE56,ESD08V52D-C,TPSMA6J17A,5.0SMDJ33CA,UNS3K,UN2E6-SMD SERIES,UN1812-390H,TPSMDJ24CA,20D361K,40D361KJ,4.0SMF13CA,SMDJ160A,SMBJ160CA-AT,TP5.0SMDJ28A,

选型指南 - 优恩半导体 PDF 英文下载

符合性声明 (Declaration of Conformity)

型号- AMWSA,MPH,AWPR-2,PZ/APZ,MPL,HQ,SPH,MPM,ARCDC,GESD,EPZ,WPH,WPG,WPL,AMCW-B,HZ,WPN,SDMM,SVMH,WTX,WPL SERIES,MQA,HFZ,UPZ,ACSR,SLCP,WPZ,SDCW,SDV,SLFBF,AMCW-P,AMP,HFPZ,MQQ,TWP,ASWPA,SLDA,ALTWR-F,WPL系列,TWS,ALTWR-H,SWRB,ALTWR-G,MZA,ALTWR-C,FA,MWLA,MWTC,SWRH,SLFS,ARLDC,SLFT,ATWPEP,SLBL,SDNT-C,ATWPEQ,ATWS,HPZ,AMWPQ,BW,TPP,AMWLA,AMWPH,SDCL,MWSA,MWSC,CWS,ATWPEF,ACWS,SDVL,SZ,MCL-N,TC,SDNT,SLFD,SDFL,SWPA,GZ,SLFB,MCL-A,MCL,SLFL,SLFH,ATWPPQ

测试报告 - 顺络 - 2023.11.07 PDF 中英文下载

【选型】RS485通信口实现共模4KV，差模2KV防护设计如何选型？

本文将分享笔者近期刚完成的对RS485通信口实现共模4KV，差模2KV（IEC61000-4-5 Level 4）的防护设计。在该设计中，笔者选用了Littelfuse的系列防护器件，包含GDT（气体放电管）、PTC（自恢复保险丝）、TVS（瞬态电压抑制二极管）。

器件选型发布时间 : 2020-12-24

达晶微授权世强硬创代理，超3000个功率器件型号全方位覆盖用户需求

达晶微产品拥有3000多个产品型号，在手机、电脑、电视、通讯、安防、车载、穿戴、医疗、新能源汽车、光伏、储能等领域得到广泛应用。

签约新闻发布时间 : 2023-10-20

Sunlord's products符合性声明(Declaration of Conformity of Sunlord's products)

型号- MPH,AWPR-2,MPL,HQ,SPH,PZ,MPM,ARCDC,WPH,EPZ,GESD,WPG,WPL,HZ,AMCW-B,WPN,SDWL-F,SDMM,SVMH,WTX,WPL SERIES,MQA,HFZ,UPZ,ACSR,WPZ,SLCP,AMQC,SDCW,SDV,SLFBF,AMP,AMCW-P,HFPZ,MQQ,TWP,ASWPA,SLDA,WPL系列,TWS,SWRB,MZA,FA,MWTC,SWRH,SDWL,SLFS,SLFT,ATWPEP,SLBL,SDNT-C,HPZ,AMWPQ,WL,TPP,BW,AMWPH,MWSA,SDCL,MWSC,ATWPEF,MWSD,SDVL,SZ,MCL-N,TC,SDFL,SDNT,SLFD,SWPA,GZ,SLFB,MCL-A,MCL,SLFL,SLFH,ATWPPQ

测试报告 - 顺络 - 2022/7/13 PDF 中英文下载

电感制造商顺络（sunlord）授权世强代理其片式、陶瓷、高频、PoC、功率及车规级电感等

近日，顺络签约世强硬创电商，成为了世强代理的第238家品牌。顺络成立于2000年，主要从事芯片电子元件类型的开发制造，其主要产品包括线叠层片式电感器、绕线片式电感器、共模扼流器、压敏电阻器、NTC 热敏电阻器、LC 滤波器、各类天线、NFC 磁片、无线充电线圈组件、电容、电子变压器等。另外，顺络还推出了满足AEC-Q200的车规级产品，包括EMC元件、电感、变压器、无线充电圈等。顺络已在平台陆续

公司动态发布时间 : 2020-12-26

顺络压敏电阻选型表

顺络压敏电阻选型表，主要提供以下参数进行选型，Operating Temp：-55℃ ~+125℃；最大工作电压DC(V)：5.5V~455V;额定脉冲耐量Energy 10/1000μs(Joules)：0.003~8Joules；最大工作电压DC RMS(V)：4V~350V.

额定脉冲耐量Energy 10/1000μs(Joules)

额定脉冲耐量Peak Current 8/20μs(Amps)

选型表 - 顺络立即选型

SVMH Series High Voltage Multilayer Chip Varistor for Surge Suppression

型号- SVMH2016KA171PT181,SVMH5650KA321PT102,SVMH4532 TYPE,SVMH2016 TYPE,SVMH2016KA271PT500,SVMH3225KA191PT401,SVMH3216KA151PT301,SVMH5650KA301PT801,SVMH5650KA271PT801,SVMH4532,SVMH3216KA251PT101,SVMH5650KA231PT152,SVMH,SVMH2016KA301PT500,SVMH4532KA321PT251,SVMH5650 TYPE,SVMH3225KA151PT401,SVMH5650KA231PT202,SVMH5650KA191PT152,SVMH3216KA231PT201,SVMH3225KA301PT301,SVMH3225KA321PT151,SVMH3225 TYPE,SVMH4532KA301PT801,SVMH4532KA171PT801,SVMH4532KA301PT401,SVMH3225KA231PT401,SVMH2016KA191PT101,SVMH2016KA211PT101,SVMH5650KA231PT122,SVMH3216 TYPE,SVMH2016KA321PT500,SVMH3216KA271PT101,SVMH3216KA321PT600,SVMH5650KA191PT122,SVMH3216KA171PT301,SVMH5650KA211PT152,SVMH3216,SVMH5650KA151PT152,SVMH2016KA251PT500,SVMH SERIES,SVMH2016KA251PT700,SVMH2016KA151PT181,SVMH3225KA171PT401,SVMH3216KA301PT101,SVMH3225KA271PT201,SVMH2016KA151PT101,SVMH3216KA211PT201,SVMH5650KA171PT152,SVMH3225KA301PT401,SVMH2016KA231PT101,SVMH3225KA321PT251,SVMH5650KA251PT801,SVMH3225KA301PT201,SVMH2016,SVMH3225,SVMH3225KA251PT201,SVMH5650KA211PT122,SVMH5650KA351PT102,SVMH5650,SVMH3225KA211PT401,SVMH3216KA191PT201

数据手册 - 顺络 - 2023/3/23 PDF 英文下载