【选型】开关电源中的压敏电阻应该如何选型
开关电源多采用脉冲宽度调制(PWM)技术,脉冲波形呈矩形,其上升沿与下降沿包含大量的谐波成分,另外输出整流管的反向恢复也会产生电磁干扰(EMI),这是影响可靠性的不利因素,这使得系统具有电磁兼容性成为重要问题。
在保护电路的方面,为使电源能在各种恶劣环境下可靠地工作,应在设计时加入多种保护电路,如防浪涌冲击、过欠压、过载、短路、过热等保护电路措施。
因为元器件直接决定了电源的可靠性,所以元器件的选用是尤为重要。元器件的失效主要集中在以下四点:制造质量问题、器件可靠性的问题、设计问题、损耗问题。在使用中应对此予以足够重视。在开关电源中常用的一种保护元器件就是压敏电阻,它的阻值会随着电压的变化而变化,因此在开关电源线路中使用压敏电阻,能够同时提供电压和雷击浪涌保护,当故障发生时能及时启动给电路提供保障。
笔者整理了开关电源中压敏电阻的一些选型要点,下面来给大家介绍:
压敏电阻选型要点:
选用压敏电阻器前,应先了解以下相关技术参数:标称电压是指在规定的温度和直流电流下,压敏电阻器两端的电压值 。漏电流是指在25℃条件下,当施加最大连续直流电压时,压敏电阻器中流过的电流值。等级电压是指压敏电阻中通过8/20等级电流脉冲时在其两端呈现的电压峰值。通流量是表示施加规定的脉冲电流(8/20μs)波形时的峰值电流 。浪涌环境参数包括最大浪涌电流Ipm(或最大浪涌电压Vpm和浪涌源阻抗Zo)、浪涌脉冲宽度Tt、相邻两次浪涌的最小时间间隔Tm以及在压敏电阻器的预定工作寿命期内,浪涌脉冲的总次数N等。
一般地说,压敏电阻器常常与被保护器件或装置并联使用,在正常情况下,压敏电阻器两端的直流或交流电压应低于标称电压,即使在电源波动情况最坏时,也不应高于额定值中选择的最大连续工作电压,该最大连续工作电压值所对应的标称电压值即为选用值。对于过压保护方面的应用,压敏电压值应大于实际电路的电压值,一般应使用下式进行选择:
VmA=av/bc
式中 :a为电路电压波动系数;v为电路直流工作电压(交流时为有效值);b为压敏电压误差;c为元件的老化系数,;这样计算得到的VmA实际数值是直流工作电压的1.5倍 ,在交流状态下还要考虑峰值,因此计算结果应扩大1.414倍 。
另外,选用时还必须注意:
(1)必须保证在电压波动最大时,连续工作电压也不会超过最大允许值,否则将缩短压敏电阻的使用寿命;
(2)在电源线与大地间使用压敏电阻时,有时由于接地不良而使线与地之间电压上升,所以通常采用比线与线间使用场合更高标称电压的压敏电阻器 。
压敏电阻所吸收的浪涌电流应小于产品的最大通流量。
更多硕凯品牌压敏电阻型号及参数,可参考世强电商平台【选型】硕凯电子(Socay)MOV压敏电阻选型指南。
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SOCAY硕凯压敏电阻20D561K在路灯电源输出端的浪涌防护,通流量可达6.5KA
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硕凯电子(Socay)MOV压敏电阻选型指南
目录- Radial Lead Metal Oxide Varistor
型号- 14D181K,40D271K,25D301K,10D681KJ,10D221KJ,07D121KJ,14D821K,20D470K,20D361K,14D182KJ,10D112KJ,40D911K,14D180K,07D220K,32D361K,05D621K,53D122K,07D680K,14D820K,25D751K,10D560KJ,14D301KJ,10D331KJ,20D181KJ,07D241KJ,07D241K,32D241K,32D471K,40D152K,05D511K,07D471K,20D201KJ,10D220KJ,34S621K,05D470KJ,20D431KJ,20D121K,14D390KJ,53D112K,05D361KJ,07D680KJ,14D181KJ,07D471KJ,07D121K,14D182K,53D221K,53D681K,20D471K,20D241K,10D561KJ,20D182KJ,32D122K,10D330KJ,05D820K,07D221KJ,34S821K,14D270KJ,25D511K,05D241KJ,10D511K,40D182K,05D471KJ,05D180K,34S182K,20D151K,14D391KJ,20D781KJ,07D681KJ,07D361K,20D911K,05D121KJ,07D470K,10D621K,07D330KJ,07D561KJ,20D271K,10D121KJ,14D511KJ,32D221K,32D112K,07D220KJ,14D621KJ,53D361K,32D681K,10D680KJ,14D271KJ,10D241KJ,10D751K,32D331K,10D911KJ,53D241K,14D781KJ,32D561K,25D621K,40D391K,53D471K,07D560KJ,05D680KJ,32D102K,20D331KJ,10D470KJ,40D122K,20D431K,10D820KJ,20D681KJ,20D201K,10D301K,20D221KJ,20D781K,25D681K,10D361KJ,05D201K,25D122K,05D431K,34S301K,07D151KJ,07D301K,20D561KJ,53D301K,05D390KJ,20D330KJ,40D112K,40D221K,40D681K,25D561K,25D331K,34S201K,34S431K,40D,07D431K,10D821KJ,10D471KJ,07D201K,20D220KJ,14D471K,05D511KJ,20D911KJ,20D151KJ,14D241K,40D331K,40D561K,32D391K,25D221K,53D,25D112K,05D621KJ,05D270KJ,14D911KJ,53D751K,14D151KJ,14D470K,20D560KJ,07D271KJ,14D361K,05D391KJ,07D470KJ,32D271K,14D270K,14D391K,05D751K,53D331K,53D561K,20D112K,20D220K,20D680K,14D470KJ,53D102K,05D151KJ,32D911K,14D390K,25D102K,07D781K,40D361K,05D271KJ,34S511K,10D431K,07D361KJ,10D201K,10D781K,20D122K,07D820KJ,20D241KJ,20D471KJ,07D330K,05D301K,07D681K,07D560K,20D680KJ,32D,20D,40D241K,40D471K,32D152K,53D781K,20D102K,07D221K,05D820KJ,10D331K,10D330K,10D560K,10D681K,10D101K,14D471KJ,20D331K,20D561K,53D431K,53D201K,10D151KJ,14D271K,14D361KJ,07D561K,25D431K,25D201K,20D101K,07D101K,07D331K,34S751K,10D561K,10D102K,14D911K,20D221K,20D560K,20D681K,20D330K,07D821KJ,25D781K,14D151K,20D470KJ,10D,05D121K,20D621K,34S122K,05D201KJ,20D361KJ,05D431KJ,34S,20D820KJ,14D102K,32D511K,40D301K,25D271K,10D511KJ,14D121KJ,14D821KJ,05D241K,20D511K,14D241KJ,05D471K,10D271KJ,10D220K,10D221K,05D180KJ,10D112K,10D680K,14D101K,14D331K,14D561K,32D621K,25D391K,07D181KJ,07D301KJ,20D821KJ,34S241K,34S471K,05D361K,07D621K,10D241K,05D470K,10D471K,14D680KJ,14D431K,14D201K,25D,25D152K,40D751K,14D820KJ,07D751KJ,10D270KJ,10D121K,20D121KJ,10D621KJ,10D391KJ,25D911K,14D781K,25D361K,14D,40D102K,14D330KJ,05D301KJ,14D560KJ,34S102K,05D101K,05D561K,05D331K,07D511KJ,07D391KJ,14D221KJ,14D681KJ,14D122K,14D112KJ,10D751KJ,40D781K,05D221K,05D330K,05D560K,05D681K,34S781K,20D301K,07D511K,10D361K,10D390KJ,10D470K,20D122KJ,53D511K,07D270KJ,14D121K,10D182KJ,14D331KJ,40D201K,40D431K,14D561KJ,34S112K,34S681K,05D220K,07D390KJ,34S221K,05D680K,14D220KJ,53D621K,14D112K,14D221K,14D560K,14D681K,10D301KJ,07D621KJ,14D122KJ,05D,14D330K,25D471K,25D241K,20D751K,07D751K,34S561K,20D271KJ,34S331K,32D821K,05D181KJ,14D680K,10D181KJ,14D220K,14D102KJ,53D391K,10D911K,07D271K,07D781KJ,10D271K,05D391K,05D270K,05D390K,20D112KJ,34S271K,05D220KJ,07D,20D511KJ,07D151K,34S911K,53D271K,32D781K,10D151K,20D270KJ,05D681KJ,20D621KJ,53D911K,20D101KJ,20D182K,32D201K,32D431K,10D180KJ,14D751K,20D391KJ,05D560KJ,05D751KJ,14D101KJ,07D390K,10D201KJ,14D431KJ,20D391K,14D621K,20D270K,05D221KJ,07D101KJ,10D390K,05D561KJ,05D330KJ,53D152K,07D270K,07D391K,10D270K,07D331KJ,05D181K,20D390K,34S391K,14D511K,20D102KJ,10D391K,40D821K,20D390KJ,10D781KJ,10D182K,07D180KJ,07D821K,53D821K,14D180KJ,32D301K,25D182K,40D511K,53D182K,05D331KJ,34S361K,10D102KJ,40D621K,20D821K,07D180K,10D180K,10D820K,05D151K,34S152K,10D431KJ,14D201KJ,20D181K,25D821K,32D751K,14D751KJ,07D431KJ,20D301KJ,07D201KJ,20D751KJ,20D820K,07D181K,05D101KJ,10D181K,10D821K,07D820K,05D271K,10D101KJ,14D301K,20D180K,20D180KJ
【经验】压敏电阻防雷的工作原理及特点
压敏电阻器相当于一个可变电阻,它是并联于电路中的,当电力线被雷击时,雷电波的高电压使压敏电阻击穿,雷电流通过压敏电阻流入大地,使电力线上的电压被钳制在安全范围内。压敏电阻的性能稳定、通流能力大,由于其突波承受能力取决于它的物理尺寸,因而有可能获得不同的浪涌电流值。
基于硕凯压敏电阻14D561K的IGBT快速开关电路,在浪涌抗干扰度试验中通过4级,且试验电压提高10%
本试验选用压敏电阻14D561K:击穿电压:504V-616V;通流量IPP高达4500A;位电压最大值 925V(50A);工作温度:-55 至+125°C;具有通流量大、残压低、响应时间快等特点。当干扰电压达到一定值时,就会把两端的电压钳位住,从而保护IGBT不被击穿
赛尔特(SETsafe丨SETfuse)MOV压敏电阻选型指南(简版)
描述- 赛尔特设计、制造、销售业界领先的电路控制及安全保护元器件、提供电路安全解决方案。产品销往40多个国家和地区,与世界500强的部分企业有深远的合作,首创、独创多个产品;取得CCC、UL、cUL、VDE、TUV、PSE、KC等认证,符合RoHS、REACH。SETsafe | SETfuse has a presence in more than 40 countries and regions recognising products. Some of the world's 500 fortune companies are valuable customers.
型号- 14D,TFV15S SERIES,SFV20DXXXK,10D,10D 系列,20S 系列,14D201,34S,10S,SFV40SXXXK,7D SERIES,53D 系列,20D SERIES,SFV7DXXXKT,20S SERIES,20D471,TFV8S 系列,SFV10SXXXK,TFV,TFV10S,25D821,TFV15S 系列,TFV10SXXX,15S,34S821,10S SERIES,15S 系列,TFV SERIES,TYPE K,10D621,20D 系列,TYPE H,25D SERIES,SFV15SXXXK,SFV10DXXXKT,SFV10DXXXK,7D 系列,TYPE T,20D201,SFV34SXXXK,TFV8S SERIES,TFV10S SERIES,TYPE Q,15S SERIES,SFV20SXXXK,53D SERIES,20D,15S820,34S431,14D820,14D621,25D431,SFV14DXXXK,14D 系列,TFV15S,SFV53DXXXK,34S SERIES,34S 系列,20S,25S 系列,SFV7DXXXK,TFV15SXXX,25D,SFV14DXXXKT,14D SERIES,53D,TFV8SXXX,SFV25DXXXK,10D681,7D,SFV25SXXXK,25D201,10D201,25S,10D SERIES,14D471,25S SERIES,25D 系列,SFV20DXXXKT,TFV10S 系列,TFV8S,10S 系列
【应用】国产压敏电阻14D561K用于LED路灯,通流量可达6KA
由于LED灯具有节能、响应时间短、使用寿命长、可直接替换传统灯等优点,所以LED灯的应用越来越广泛,现如今LED路灯也是随处可见。本篇主要讲述硕凯电子14D561K压敏电阻在LED路灯的应用,具有大通流量雷电在电源线路上产生感应浪涌,这个浪涌的能量会在电线上产生一个突波,即浪涌波,浪涌就是通过这样的感应方式进行传输的。
14D Series Metal Oxide Varistors
型号- 14D181K,14D102KJ,14D561-182K,10D,14D821K,14D182KH,14D182KJ,14D102K,14D121KJ,14D102KH,14D821KH,14D180K,14D821KJ,14D241KJ,14D820K,14D101K,14D331K,14D561K,14D152KH,14D471KE,14D751K,14D301KJ,14D152KJ,14D101KJ,14D431KJ,14D621K,14D431KH,14D680KJ,14D390KJ,14D431K,14D201K,14D471K,14D181KJ,14D241K,14D182K,14D820KJ,14D511K,14D911KH,14D911KJ,14D781K,14D151KJ,14D470K,14D361K,14D,14D270K,14D391K,14D330KJ,14D560KJ,14D270KJ,10D511K,14D221KJ,14D681KH,14D180KJ,14D470KJ,14D681KJ,14D391KJ,14D112KJ,14D390K,5D,14D511KH,14D511KJ,14D121K,14D112KH,14D331KJ,14D621KJ,32D,14D561KJ,20D,14D621KH,14D561KH,14D751KH,14D271KJ,14D201KJ,14D220KJ,14D471KJ,14D 系列,14D751KJ,14D471KH,14D221K,14D112K,14D560K,14D681K,14D152K,14D330K,14D271K,14D361KJ,14D781KH,14D SERIES,14D781KJ,7D,14D951KJ,14D951K,14D951KH,14D911K,14D680K,14D301K,14D151K,14D220K
【应用】10D681K压敏电阻用于洗衣机电源,满足差模2KV的浪涌测试
在洗衣机电源控制板中,由于存在接入市电电压不稳定以及雷雨天气产生的感应雷会对开关电源造成不良影响。针对此问题,硕凯电子给出了一个性价比较高的防护方案,只需要在输入端加一级压敏电阻就可以解决以上问题。可以过1.2/50uS组合波差模2KV的浪涌测试,测试次数正负五次,间隔60秒。该方案用到了普通型的压敏电阻10D681K。
【经验】放电电阻、热敏电阻、压敏电阻、吸收电阻、VCC电阻、反馈电阻等开关电阻的计算
开关电源里面用量很大的一个元器件——电阻。本文讲述了关于放电电阻、热敏电阻、压敏电阻、吸收电阻、VCC电阻、反馈电阻等开关电阻的计算
10D Series Metal Oxide Varistor
型号- 14D,10D470KJ,10D,10D911K,10D781KJ,10D681KH,10D 系列,10D781KH,10D681KJ,10D951K,10D511K,10D182K,10D820KJ,10D271K,10D301K,10D221KJ,10D152KJ,10D551KH,10D112KJ,10D112KH,10D361KJ,10D511KJ,10D152KH,10D751KJ,10D751KH,10D621K,10D151K,10D431K,10D271KJ,5D,10D220K,10D221K,10D112K,10D201K,10D361K,10D781K,10D121KJ,10D470K,10D680K,10D390KJ,10D180KJ,10D182KH,10D102KJ,10D560KJ,10D102KH,10D331KJ,10D182KJ,10D471KH,10D951KJ,20D,10D951KH,10D180K,10D820K,10D201KJ,10D431KH,10D680KJ,10D821KJ,10D220KJ,10D471KJ,10D152K,10D241K,10D241KJ,10D431KJ,10D331K,10D751K,10D330K,10D560K,10D681K,10D101K,10D471K,10D821KH,10D390K,10D471KT,10D911KH,10D911KJ,10D301KJ,10D151KJ,10D181K,10D270K,10D821K,7D,10D270KJ,10D121K,10D561K,10D621KJ,10D102K,10D391KJ,10D SERIES,10D621KH,10D391K,10D561KJ,10D561KH,10D101KJ,10D330KJ,10D181KJ
电子商城
品牌:硕凯电子
品类:Surface Mount Multilayer Varistor
价格:¥0.0640
现货: 5,148,500
品牌:硕凯电子
品类:Surface Mount Multilayer Varistor
价格:¥0.0375
现货: 2,050,028
现货市场
服务
测试1.2/50us-8/20us组合波,10/700us-5/320us组合波,8/20us单波。能够模拟雷电瞬变引起的浪涌冲击抗干扰测试,最高电压达20KV,电流达20KA。点击预约,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/上海 提交需求>
测试等级:空气放电30KV±5%;接触放电30KV±5%,适用标准:GB/T 17626.2、IEC61000-4-2、ISO10605、GB/T 19951;给用户产品出电路保护设计方案建议及整改。点击预约,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/上海 提交需求>
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