【技术】浅析自恢复保险丝响应时间及自燃现象
PPTC-自恢复保险丝是一种过流保护器件,具有可恢复的特性,主要应用于一些电子设备的短路以及超载防护。它的响应时间是多久?以及它的自燃现象你知道吗?
自恢复保险丝的响应时间是多久?
其实它的一个响应时间速度与工作温度、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。
保险丝的自燃现象
自恢复保险丝使用不当,在特定条件下会发生自燃现象,我们该如何避免?
首先,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,流过自恢复保险丝的电流过大,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,则恢复原始状态。
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。
大家在使用自恢复保险丝,应当采取应用措施,比如与常规保险丝串联使用,这样就能在自恢复保险丝发生自燃时,起到双重保护效果。
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本文由玉鹤甘茗转载自优恩半导体官网,原文标题为:简要阐述PPTC自恢复保险丝响应时间及自燃现象,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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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
2920N PPTC
描述- 本资料介绍了2920系列过电流保护器件(PPTC),包括其一般信息、电气规格、热特性图表、构造与机械特性、物理特性、测试程序和要求、环境规格、焊接工艺和垫片布局尺寸、包装信息和订购信息。该系列产品具有快速断开、表面贴装、固态等特点,适用于多种电子设备。
型号- 2920-N-0300/60-B-000,2920N0500/60B000,2920N1100/33B000,2920N1260/16B000,2920N1400/16A000,2920N1185/33A000,2920N1260/24B000,2920N1400/12A000,2920N1500/16A000,2920N1250/16B000,2920N1200/24A000,2920N1300/6B000,2920N1300/16A000,2920N,2920N0750/33B000,2920N0300/60B000,2920N1125/33B000,2920N1150/33B000,2920N1500/12A000,2920N1300/24A000,2920N1200/16B000
【经验】贴片式PPTC的使用注意事项及应用范围
贴片式PPTC是一种片状形式的小型保险丝,单从肉眼上看与普通电阻并无一二,但实际它具备的特性要比普通电阻更具优势。其具备较强的分段能力,当规定电流与额定分断电流之间的电流流过时,PPTC不会熔断,也不会对其它元件造成干扰。
SMD表面贴装0805系列聚合物PTC自恢复保险丝
描述- 本资料介绍了TLCET公司生产的聚合物PTC可恢复保险丝。该产品适用于多种电子设备,提供过流和过温保护功能。资料详细列出了不同型号的保险丝的技术规格、电气特性、热特性、环境特性和包装信息。
型号- TLC-PSMD110/13.2,TLC-PSMD035/9,TLC-PSMD050,TLC-PSMD035/12,TLC-PSMD010/24,TLC-PSMD050/9,TLC-PSMD035,TLC-PSMD075/8,TLC-PSMD100,TLC-PSMD110,TLC-PSMD010,TLC-PSMD020,TLC-PSMD075,TLC-PSMD030,TLC-PSMD150,TLC-PSMD005/60,TLC-PSMD020/12,TLC-PSMD100/13.2,TLC-PSMD005,TLC-XSMDXXX
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