【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
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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描述- 本资料为Sunlord公司符合性声明,声明其产品符合欧盟RoHS指令、无卤要求、EU REACH 235项高度关注物质的限值要求,并保证产品不含冲突地区矿产。声明详细列出了限用物质的名称、CAS编号、限量要求,以及特别声明中某些物质的存在和含量。此外,还提供了适用产品型号列表,涵盖多种工艺平台、产品类别和系列。
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
【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)。
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。
AU0781D1F-T单线双向TVS二极管
描述- 该资料介绍了AU0781D1F-T双向TVS二极管的特点和应用。这种二极管采用先进的单晶硅技术,提供快速响应时间和低ESD钳位电压,适用于保护敏感数据和电源线路。它符合IEC 61000-4-2(ESD)标准,并具有小型化设计和高ESD/浪涌防护能力。
型号- AU0781D1F-T
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.
产品型号
|
品类
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Operating Temp(℃)
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最大工作电压DC(V)
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最大工作电压DC RMS(V)
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压敏电压 Min.@1mA DC(V)
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压敏电压 Max.@1mA DC(V)
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限制电压8/20μs(V)
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限制电压8/20μs(Amps)
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额定脉冲耐量Energy 10/1000μs(Joules)
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额定脉冲耐量Peak Current 8/20μs(Amps)
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L×W(mm*mm)
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T尺寸(mm)
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SDVL1608SD090PTHS101
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压敏电阻
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-55℃ ~+125℃
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9V
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6.4V
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11V
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16V
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30V
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1Amps
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0.1Joules
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100Amps
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1.6mm×0.8mm
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0.8mm
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选型表 - 顺络 立即选型
SDV系列多层片式压敏电阻器
描述- 该资料介绍了SDV系列多层芯片压敏电阻(Varistor)的特性、规格和应用。SDV系列适用于高密度安装,具有优异的钳位比和快速响应时间,适用于IC和晶体管的瞬态电压保护、ESD保护和MOSFET保护等。
型号- SDV1608A140C251□PTF,SDV1608E180C180□PTF,SDV1608H220C050YPTF,SDV1005H140C100□PTF,SDV2012,SDV1005E090C300□PTF,SDV1005E180C300□PTF,SDV1005H220C120□PTF,SDV1608S5R5C100□PTF,SDV1005S180C0R5YPTF,SDV1608E220C500□PTF,SDV1608S090C120□PTF,SDV1005S090C0R5YPTF,SDV1005S5R5C050YPTF,SDV-H,SDV1608,SDV1608A220C141□PTF,SDV1005S140C030YPTF,SDV1608H260C100□PTF,SDV1608E220C800□PTF,SDV2012A140C701□PTF,SDV1608E220C101□PTF,SDV1608A300C141□PTF,SDV1608E180C101□PTF,SDV SERIES,SDV,SDV1608S090C100□PTF,SDV2012E180C101□PTF,SDV-A,SDV1608A260C161□PTF,SDV-E,SDV1608E180C800□PTF,SDV2012E260C800□PTF,SDV1608S5R5C0R5YPTF,SDV2012A220C401□PTF,SDV1608S5R5C120□PTF,SDV1608A180C141□PTF,SDV1608S090C010YPTF,SDV1608E140C300□PTF,SDV1608A220C121□PTF,SDV1005E090C800□PTF,SDV1608H260C0R5YPTF,SDV2012A090C701□PTF,SDV1608 SERIES,SDV1608H,SDV1608A090C201□PTF,SDV1608A220C161□PTF,SDV1005H260C020YPTF,SDV1005H260C0R5YPTF,SDV1005 SERIES,SDV1608E,SDV1608H300C100□PTF,SDV1608E260C500□PTF,SDV1608H180C100□PTF,SDV1608E260C180□PTF,SDV1608H260C010YPTF,SDV1005E140C180□PTF,SDV1608H220C030YPTF,SDV1005S360C050YPTF,SDV1608H140C120□PTF,SDV1005H180C050YPTF,SDV1608S5R5C020YPTF,SDV1005H TYPE,SDV1005H260C030YPTF,SDV1005H140C120□PTF,SDV1005H220C050YPTF,SDV1608A,SDV1608E220C300□PTF,SDV1608S090C020YPTF,SDV1005S420C050YPTF,SDV1608E180C300□PTF,SDV2012A140C401□PTF,SDV1005H180C100□PTF,SDV1608A090C361□PTF,SDV2012A220C251□PTF,SDV1608E140C800□PTF,SDV1608E090C101□PTF,SDV1608A140C121□PTF,SDV1608H220C100□PTF,SDV1608S140C030YPTF,SDV1608E090C500□PTF,SDV1005S5R5C120□PTF,SDV1608A090C141□PTF,SDV1005E180C800□PTF,SDV1005S180C030YPTF,SDV1608S180C010YPTF,SDV1608E090C180□PTF,SDV1005S140C020YPTF,SDV1608E TYPE,SDV1608H TYPE,SDV1608S140C0R5YPTF,SDV2012A180C701□PTF,SDV1005S140C050YPTF,SDV2012E,SDV1005S180C020YPTF,SDV2012A300C181□PTF,SDV1005E220C180□PTF,SDV1005S090C020YPTF,SDV1005,SDV1608A180C231□PTF,SDV1005H260C100□PTF,SDV1608H260C030YPTF,SDV1608A090C231□PTF,SDV1005E TYPE,SDV1608A260C121□PTF,SDV2012A090C102□PTF,SDV1005S090C010YPTF,SDV1608S090C050YPTF,SDV1608S5R5C050YPTF,SDV1005E140C800□PTF,SDV1005E140C500□PTF,SDV2012A220C501□PTF,SDV1608E180C600□PTF,SDV2012A260C401□PTF,SDV1005S5R5C010YPTF,SDV1608S180C0R5YPTF,SDV1608H140C100□PTF,SDV1005S5R5C100□PTF,SDV1608H220C120□PTF,SDV1005S090C120□PTF,SDV1005E090C180□PTF,SDV1005E220C500□PTF,SDV1005S180C010YPTF,SDV1608A180C121NPTF,SDV1608A TYPE,SDV2012A140C901□PTF,SDV1608E090C300□PTF,SDV2012A TYPE,SDV1608A180C361□PTF,SDV2012A180C501□PTF,SDV1005S5R5C020YPTF,SDV1005S140C0R5YPTF,SDV1608S,SDV1005E090C500□PTF,SDV1608S5R5C030YPTF,SDV1608S140C020YPTF,SDV1608E260C300□PTF,SDV1005S090C030YPTF,SDV1608H480C100□PTF,SDV1608A220C231□PTF,SDV1005E220C150□PTF,SDV1608S090C030YPTF,SDV1608A180C121□PTF,SDV2012A260C251□PTF,SDV1005E180C500□PTF,SDV1005S5R5C030YPTF,SDV1608S140C050YPTF,SDV1608S5R5C010YPTF,SDV1608E140C500□PTF,SDV1608A140C141□PTF,SDV1608A140C361□PTF,SDV1608E140C101□PTF,SDV1005S090C100□PTF,SDV1608A090C121□PTF,SDV1005H220C100□PTF,SDV1608H260C120□PTF,SDV1608S180C030YPTF,SDV1005S140C010YPTF,SDV1005E140C300□PTF,SDV1608A300C121□PTF,SDV1608E140C180□PTF,SDV1608H180C050YPTF,SDV1005S,SDV1608S090C0R5YPTF,SDV2012A180C301□PTF,SDV1005S090C050YPTF,SDV1608S180C020YPTF,SDV-E SERIES,SDV-H SERIES,SDV2012E TYPE,SDV-A SERIES,SDV1005H260C120□PTF,SDV1005S TYPE,SDV1608E090C800□PTF,SDV2012E300C500□PTF,SDV1608S140C010YPTF,SDV1005E180C150□PTF,SDV1005E180C180□PTF,SDV1608H260C020YPTF,SDV1608S TYPE,SDV1005E220C300□PTF,SDV2012A300C301□PTF,SDV1005H,SDV1608E220C180□PTF,SDV1005E,SDV1005H260C010YPTF,SDV2012E220C101□PTF,SDV1005H220C030YPTF,SDV1005S5R5C0R5YPTF,SDV1608H180C120□PTF,SDV2012A
Sunlord's products符合性声明(Declaration of Conformity of Sunlord's products)
描述- 本资料为Sunlord公司符合性声明,声明其产品符合欧盟RoHS指令、无卤要求、EU REACH 224项高度关注物质的限值要求,并保证产品不含冲突地区矿产。声明详细列出了限用物质名称、CAS No.、限量,并特别说明了部分产品中特定物质的存在及含量。资料还包含了适用产品型号列表,涵盖多种工艺平台、产品类别和系列。
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
优恩半导体带网变和浪涌保护的百兆/千兆以太网RJ45连接器,网口高温85°C不丢包、保障网口通讯安全稳定
描述- 随着科学技术的高速发展,万物互联并网的趋势已经成为必然。网络端口也越来越多的出现在电子产品上面,因其较远的传输距离且复杂的布线环境,如架空户外及通信机房等电磁环境较复杂的地方,极易通过网线端引入干扰导致系统重启、死机及严重的芯片损坏等现象。此类情况必然给后续产品的稳定性及可靠性带来一定隐患,如何保证网口部分能高效 、可靠 、安全地抵挡住外界的干扰,一套完善的解决方案就显得尤为重要 。
型号- UN111B324GWA1DFL,UN111B339GWA1DFL,UN111B339HWA1DFL,UN111Q303AB2A1DFL,UN111Q303GWA1DFL,UN111B339DB2A1DFL,UN111B339AB2A1DFL,UN111Q303DB2A1DFL,UN111B324FB2A1DFL,UN111B324AB2A1DFL,UN111B372BA2A1DFL,UN111Q303HWA1DFL
SVMH系列高压多层片式浪涌抑制压敏电阻器
描述- 本资料介绍了Sunlord公司生产的SVMH系列高压多层片式压敏电阻器。该产品适用于交流电路,具有小型化设计、良好的浪涌抑制能力和优异的耐压性能。产品广泛应用于电源、网络接口和LED照明等领域的防雷和过压保护。
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
Sunlord 符合性声明
型号- MPH,AWPR-2,MPL,HQ,PZ,SPH,ARCDC,MPM,GESD,EPZ,WPH,WPG,AMCW-B,HZ,WPL,WPN,SDMM,HFZ,UPZ,SLCP,AMQC,WPZ,SDCW,AMCW-P,SDV,SLFBF,HFPZ,ASWPA,SLDA,WPL系列,MZA,SLFS,SDWL,SLFT,ATWPEP,SLBL,HPZ,AMWPQ,WL,BW,SDCL,ATWPEF,MWSC,MWSD,SDVL,SZ,TC,SDFL,SDNT,SLFD,SWPA,GZ,SLFB,MCL,SLFL,SLFH,ATWPPQ
电子商城
现货市场
服务
整体外形尺寸小至0.6*0.3*0.3mm (DFN0603),工作电压范围覆盖2.5V~36V,电容值低至0.2pF,浪涌能力最高可达240安培,静电等级可达空气放电、接触放电±30KV。提供免费浪涌测试仪、静电测试仪测试。
提交需求>
可定制LAMP LED、 CHIP LED、 PLCC LED、 汽车用车规级LED、COB LED的尺寸/电压/电流等参数,电压1.5-37V,电流5-150mA,波长470-940nm。
最小起订量: 30000 提交需求>
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