压敏电阻的优缺点分析及选型介绍
优恩半导体在本文将对压敏电阻的优缺点及选型进行详细的讲解,为工程师们的设计提供理论基础。详细介绍内容如下:
压敏电阻是以氧化锌为材料烧结而成的半导体限压型浪涌器件;它以其优异的非线性特性和超强的浪涌吸收能力被广泛应用于电子电路中进行保护。
压敏电阻的优点:
1、通流量大(100A~70kA)其体积越大所能承受的浪涌电流越大
2、种类齐全,使用范围广
压敏电阻的缺点:
1、压敏电阻的非线性特性较差(动态电阻较大)
2、大电流时限制电压(箝位电压)较高
3、低电压时漏电流较大,较易老化
压敏电阻的选型:
在选用压敏电阻时,必须考虑电路的具体条件,一般应遵循以下原则:
● 1、压敏电压V1mA的选取
根据电源电压选取,连续施加在压敏电阻两端的电源电压,不能超过规格书中列出的“最大持续工作电压”值。即压敏电阻器的最大直流工作电压必须大于电源线(信号线)的直流工作电压VIN ,即VDC≥VIN;对于220V 交流电源的压敏选择,要充分考虑到电网工作电压的波动幅度, 选取压敏电阻的压敏电压值时,要留有足够的余量。国内电网一般的波动幅度为25%。应选用压敏电压为470V~620V 的压敏电阻较合适。选用压敏电压高一点的压敏电阻,可以降低故障率,延长使用寿命,但残压略有增大。
● 2、通流量的选取
压敏电阻的标称放电电流应大于要求承受的浪涌电流或设备工作中可能出现的最大浪涌电流。标称放电电流应按压敏电阻浪涌寿命次数定额曲线中冲击10 次以上的数值进行计算,约为最大冲击通流量的30%(即0.3 IP)左右。
● 3、箝位电压的选取
压敏电阻的箝位电压必须小于被保护的部件或设备能承受的最大电压(即安全电压)。
● 4、电容Cp 的选择
对于高频率传输信号,电容Cp 应小些,反之亦然
● 5、内阻匹配(Resistance Match )
被保护元器件(线路)内阻R(R ≥ 2Ω)与压敏电阻瞬态内阻Rv关系: R≥5 Rv;对于内阻较小的被保护元器件,在不影响信号传输速率的情况下,尽量採用大电容压敏电阻。
压敏电阻的应用参考:
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本文由伊哟转载自世强,原文标题为:压敏电阻的优缺点及选型,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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介绍压敏电阻的特点及应用
压敏电阻(Varistor)是一种电压敏感型电阻元件,当施加的电压超过其额定值时,电阻迅速减小,从而起到过电压保护作用。它广泛应用于电子设备中,防止电路因瞬态电压、浪涌电流或雷击等引发的损坏。本文中优恩半导体来为大家介绍压敏电阻的特点及应用,希望对各位工程师朋友有所帮助。
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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,
【应用】符合IEC 61000-4-5 Surge的AC36V电源端口浪涌&过压防护解决方案
AC36V电源广泛使用在工矿、船舶等LED电源,设备易遭受气候环境的影响而导致击雷击浪涌及过过压等损坏。本文推荐陶瓷气体放电管与压敏电阻串联搭配使用,可以延长压敏电阻的使用寿命及降低压敏电阻的漏电流,且后端的残压较单级防护降低很多。
应用方案 发布时间 : 2021-05-19
【技术】解析MOV压敏电阻的两大电路防护作用
压敏电阻中电阻的材料为半导体,因此压敏电阻其实也属于一种半导体电阻器。MOV压敏电阻作为一种防护器件,你知道它在电路中发挥着什么样的作用吗?现在本文优恩半导体就带你了解MOV压敏电阻的两大电路防护作用。
技术探讨 发布时间 : 2022-10-14
【技术】解析压敏电阻的生产过程
压敏电阻是一种具有特殊性质的电阻器件,它可以在电压变化时产生电阻值的变化,从而起到保护电路的作用。其特殊的电阻性质决定了它具有抗静电、耐高温和高电压等特点,因此在电子、通信、汽车等领域得到了广泛应用。本文优恩半导体介绍压敏电阻的生产过程。
技术探讨 发布时间 : 2023-04-11
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配备KEYSIGHT网络分析仪,可测量无线充电系统发射机/接收机线圈的阻抗,电感L、电阻R、电感C以及品质因数Q,仿真不同充电负载阻抗下的无线充电传输效率。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>
可定制分流器电阻范围20uΩ~100uΩ,可自由设计铜排形状尺寸,电镀:镀锡/镀镍。支持RoHS指令 、AEC-Q200。认证资格:IATF16949;ISO9001;检测精度:0.1%。
最小起订量: 100个 提交需求>
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