【技术】防过流器件PPTC自恢复保险丝应用详解
电路保护器件根据防护作用的不一样分为过压型和过流型。传统的过流保护中一般是应用熔断型保险丝,但是由于其弊端较为明显,只能起到一次保护作用,因此,在硕凯电子可重复使用的PPTC自恢复保险丝研发成功量产之后,在很多过流保护应用中取代了熔断型保险丝,尤其是户外通信、安防设备的过流防护中,几乎都是采用的的PPTC自恢复保险丝。本文硕凯电子重点详解过流防护器件自复保险丝PPTC自恢复保险丝应用。
自恢复保险丝(PPTC)简介
自恢复保险丝是一种过流电子保护元件,采用高分子有机聚合物在高压、高温,硫化反应的条件下,搀加导电粒子材料后,经过特殊的工艺加工而成。自恢复保险丝(PPTC:高分子自恢复保险丝)是一种正温度系数聚合物热敏电阻,作过流保护用,可代替电流保险丝。
自恢复保险丝(PPTC)工作原理
PPTC可恢复保险丝的动作原理是一种能量的动态平衡,流过PPTC元件的电流由于PPTC的关系产生热量,产生的热全部或部分散发到环境中,而没有散发出去的热便会提高PPTC元件的温度。电路正常工作时它的阻值很小(压降很小),当电路出现过流使它温度升高时,阻值急剧增大几个数量级,使电路中的电流减小到安全值以下,从而使后面的电路得到保护,过流消失后自动恢复为低阻值。
自恢复保险丝(PPTC)优势特性
●有初始电阻值
●一直处于高电阻状态直至故障被排除
●自复保险丝由于尺寸更小其动作更快
●自复保险丝还可以提供过流保护(多次)
●自复保险丝寿命可以视为无限
●PPTC自恢复保险丝选型应用
自恢复保险丝是具有自动恢复功能的过流保护器件,利用能量动态平衡的原理进行工作。PPTC元件广泛应用于计算机及其外部设备、移动电话、电池组、远程通讯和网络装备、变压器、工业控制设备、汽车及其它电子产品中,起到过电流或过温保护作用。
自恢复保险丝(PPTC)选型要点
●保持电流要略大于用户的正常工作电流
●Vmax要大于或等于用户的最大工作电压
●Imax要大于最大故障短路电流
自恢复保险丝(PPTC)选型注意事项
●PPTC其实就是正温度系数热敏电阻,因此受温度影响较大。规格书上的参数是在25℃左右测得,随着温度的升高,保持电流和触发电流会下降,因此要知道PPTC的应用环境的温度。
●PPTC是用来防止后端设备短路时,电流异常增大的情况,并不能用于防瞬态浪涌,因为其动作时间比较慢 。
●PPTC的动作时间受到短路电流大小的控制,短路电流越大,动作时间越快。
SOCAY硕凯PPTC自恢复保险丝产品详情
规格系列:
●SCF0603系列
●SCF0805系列
●SCF1206系列
●SCF1210系列
●SCF1812系列
●SCF2920系列
●SC6系列
●SC16系列
●SC30系列
●SC60系列
●SC135系列
●SC250-P系列
●SC250-T系列
●SC600系列
●JK-P系列
产品外形规格
自恢复保险丝有三种封装形式:
●引线型
●薄片型(带型)
●贴装型
封装形式
●0603
●0805
●1206
●1210
●1812
●2920
引线型——耐压值(V)
06,16,30,60,90,130,250,600
产品电压
●6V-600V
产品电流
●0.05A-14A
产品特性
●体积小
●对电流、温度敏感
●电压可从6V到600V,且具有自恢复的特性
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本文由三年不鸣转载自硕凯电子,原文标题为:【技术贴】防过流器件PPTC自恢复保险丝应用详解,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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【产品】符合RoHS标准的自恢复保险丝SC60-500CZ0D,最高电压60Vdc,可用于电机电路
硕凯电子(SOCAY)顺势推出自恢复保险丝SC60-500CZ0D,该器件符合RoHS标准,不含卤素,符合UL94V-0要求,工作电流5.00A,最高电压60Vdc。有较高的环境适应性,工作温度范围为-40°~85°C。
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硕凯电子(Socay)PPTC贴片自恢复保险丝选型指南
目录- Surface Mount Resettable PTCs
型号- SCF250-2920-R,SCF001-0603-R,SCF020-R-1812,SCF150-R-1812,SCF014-1812,SCF035-30-1206R,SCF035-60-1206R,SCF012-1206-R,SCF016-1206-R,SCF075-1812,SCF1210,SCF150-12R-1812,SCF010-1206-R,SCF030-2920-R,SCF300-15-2920R,SCF110-24R-1812,SCF300R-1812,SCF020-0805-R,SCF025-24-1206-R,SCF110-R-1812,SCF050-1812,SCF050-1206-R,SCF1206,SCF003-0603-R,SCF005-0603-R,SCF010-R-1812,SCF014-R-1812,SCF035-R-1812,SCF012-0603-R,SCF150-1812,SCF2920,SCF185-2920-R,SCF160-16R-1812,SCF260R-1812,SCF075-24R-1812,SCF260-16R-1812,SCF160-1812,SCF005-1206-R,SCF075-1210-R,SCF100-0805R,SCF125-1812,SCF110-1206R,SCF010-0805-R,SCF150-1210R,SCF110-1210R,SCF075-1206R,SCF020-1206-R,SCF150-1206R,SCF300-2920-R,SCF110-16-1812,SCF050-24-1206R,SCF004-0603-R,SCF050-R-1812,SCF005-1210-R,SCF050-0805R,SCF050-9-0805R,SCF035-1206-R,SCF200-24-2920-R,SCF020-0603-R,SCF075-60-2920-R,SCF0603,SCF1812,SCF075-16-1206R,SCF150-24R-1812,SCF190R-1812,SCF200-1210R,SCF100-1206R,SCF110-1812,SCF035-1210-R,SCF075-R-1812,SCF016-0603-R,SCF075-33R-1812,SCF020-1210-R,SCF050-2920-R,SCF035-0805-R,SCF100-2920-R,SCF075-0805R,SCF075-2920-R,SCF160-12R-1812,SCF020-1812,SCF260-2920-R,SCF260-13R-1812,SCF010-0603-R,SCF025-1206-R,SCF125-R-1812,SCF110-16-R-1812,SCF160-R-1812,SCF200-2920-R,SCF200R-1812,SCF150-2920-R,SCF175-1210R,SCF075-24-1210R,SCF010-1812,SCF050-1210-R,SCF200-1206R,SCF0805,SCF125-2920-R,SCF035-1812,SCF002-0603-R,SCF010-1210-R
【选型】自恢复保险丝SCF100-0603RZB助力可重复性USB温度记录仪电源过流防护,待机功耗仅0.045W
为避免重复性记录仪USB电源输入因负载短路异常造成燃烧风险,一般需要USB电源线VBUS输入加上一颗PPTC自恢复保险丝做过流保护设计,推荐硕凯电子自恢复保险丝SCF100-0603RZB,0603表贴封装,最大额定工作电压6Vdc。
SCF0805 PPTC REACH(CTI)Test Report(A2220384796102001)
型号- SCF2920,SCF2920 SERIES,SCF1210 SERIES,SCF0603,SCF1812,SCF1812 SERIES,SCF1206,SCF0805,SCF0603 SERIES,SCF0805 SERIES,SCF1206 SERIES,SCF1210
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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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