自恢复保险丝的自燃现象及响应速度分析
PPTC自恢复保险丝主要应用在一些电子设备的短路和超载防护上,可与常规保险丝串联使用,起到双重保护的作用。
图 1
在实际应用中,我们也会遇到自恢复保险丝自燃,那么,你知道为什么会出现这种现象吗?以及它的一个响应速度。下面优恩小编就为大家简单介绍。
首先自恢复保险丝的出现自燃现象,大部分原因都是因为使用不当造成的,保险丝是由聚合树脂及导电粒子,经过特殊工艺制成,当线路短路或者超载时,流过自恢復保险丝的电流过大,其产生的热量会使聚乙烯体积膨胀,切断炭黑颗粒所形成的导电通路,从而达到防护作用。待正常工作之后,则恢復原始状态。
综上所述,其实保险丝的自燃现象,主要就是看热膨胀能否与炭黑颗粒拉开,但如果聚乙烯受热时间过长的话,其内部的分子结构很有可能会发现改变,从而影响热膨胀与炭黑颗粒的距离。
但在实际过程中,最常出现的问题还是由于炭黑颗粒的分布不均,从而引发局部温度过高,流动性增多后,就会造成炭黑的堆积,更进一步造成炭黑颗粒不均,如此循环,保险丝就会发生自燃。
自恢复保险丝的响应速度其实与工作温度、异常电流以及器件的一个散热情况息息相关,它并不是固定的一个数值,例如同一个器件,它在不同预设条件下,其动作时间可达ms级至s级。
所以一般来说,温度越高、异常电流越大、保险丝的响应速度也相对越快,器件散热情况越好,则较慢。
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本文由三年不鸣转载自优恩半导体,原文标题为:实际应用中自恢復保险丝的自燃现象及响应速度分析,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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【选型】竞沃(TLC) 过流保护产品(PPTC/FUSE/ESD/CSR/TVS)选型指南(简版)
目录- PPTC自恢复保险丝产品 一次性保险丝产品 Power TVS与ESD半导体静电抑制器 ESD静电抑制器与电流感测电阻CSR TLC产品应用领域
型号- 04 100,06 110,SMDJXXA,SMBJXXA,0402,PC01,PSMD 0805,HV610,LMMT0,12 100,HFM0,TLV SERIES,HV110.PV,PTN102H05B,TAL SERIES,06 100,USML1210,TD SERIES,LCT0,LSMD 2920,PTN102U05B,HET0,HV620,SMDJXXCA,BEV7,BEV5,PSML0805,TRB SERIES,TRA SERIES,TRE SERIES,HEET0,USMD 1210,PB01,FSML0603,HV510,HV630,HV110,MSMD1812,PTN205U05A,TLS SERIES,62720,EV1845,TRF SERIES,10800,ESDAC05,NSMD1206,HV520,SMFXXCA,12110,TVS SERIES,SMAJXXCA,42510 ESD-LVC,5.0SMDJXXCA,NSMD 1206,SMFXXA,USMD1210,06100,LMJ12,HV530,LSMD2920,LMJ10,12113,HV650,SMBJXXCA,SRC39,ANL SERIES,SMAJXXA,0603,TRM SERIES,PTN062H05B-M,62 720,PTN2510U05A,ASML0402,TRG SERIES,SRC25,MSMD 1812,HCT0,LET0,NSML***L1505,SMCJXXA,LMT0,LMJ25,HFMM0,MSML1812,SMCJXXCA,TRC SERIES,04100,PSMD0805,FSMD0603,FSMD 0603,SRC59,10 800,NSML1206,5.0SMDJXXA,PVAH1U,2410,06110,12 113,12100,12 110
FRH FRH080至FRH400径向引线PTC自恢复保险丝
描述- 该资料介绍了AiT Semiconductor Inc.生产的FRH系列可恢复保险丝(PTC Resettable Fuse)的产品特性。这些保险丝具有低保持电流、固态设计,适用于高达600V的电压范围,广泛应用于各种电子设备。
型号- FRH120-250,FRH200-600,FRH180-250,FRH145-250,FRH080-250,FRH110-250,FRH150-600,FRH400-600,FRH,FRH160-600,FRH250-600
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