【技术】PPTC自恢复保险丝材料的几种测试方法
PPTC自恢复保险丝在出厂前一定会经过多项测试,如安全性、可靠性、性能等。倘若不合格,你知道会出现什么问题吗?
PPTC是一种无毒无害产品,如果出厂检验不合格,势必会无法申请认证证书,而造成这种情况的极大原因就是保险丝使用的材料不合格。
PPTC自恢复保险丝材料不合格,可能会出现什么问题?
如果不合格,那么当自恢复保险丝置放于电路中时,则可能出现无法熔断的情况,同时在被保护电路发生浪涌过流时对其进行不了防护,从而引发多种事故。
以下优恩为大家整理了以下自恢复保险丝的几种测试方法,且看:
1、初始电阻Rmin测量:主要测量的是保险丝在焊接前的电阻值;
2、自恢复保险丝焊接:将自恢复保险丝焊接在PCB上,通过引线引出,这步对其电性测试非常方便;
3、焊接后电阻R1max测试:将焊接好的自恢复保险丝放置冷却1小时,再测量其电阻;
4、工作/维持电流Ihold测试:通过DC电源,将电压调节到额定Vmax,电流调节到额定Ihold,通电时长1个钟;
5、动作/保护电流Itrip测试:通过DC电源,将电压调节到额定Vmax,电流调节到额定动作电流Itrip,通电时长120秒;
6、Vmax测试:通过DC电源,将电压调节到额定Vmax,电流调节到额定动作电流Itrip以上,通电直到自恢复保险丝处于动作保护状态,持续通电60分钟,保险丝不烧不裂则合格。
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本文由王蓓转载自优恩半导体官网,原文标题为:PPTC自恢复保险丝材料不合格,可能会出现什么问题?,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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品类
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Hold Current I hold (A)
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Trip Current I trip (A)
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目前保险丝种类比较常见的就是自恢复保险丝PPTC与一次性保险丝了,关于保险丝呢,不少客户对它也存在很多疑问,本文优恩半导体对此整理出了三个基本常识的有效问答,希望能帮到大家。
技术探讨 发布时间 : 2023-01-18
【技术】PPTC保险丝在镇流器中发挥的作用优势是什么?
PPTC自恢复保险丝功耗很低,体积很小,它在正常电流工作情况下不会因为极点发热的现象而耗费动力,同时在电路板上几乎不占空间。总的来说,自恢复保险丝在镇流器中可发挥的优势作用有:组件少,成本低,不占PCB空间,可应用于各种规格型号的日光灯。
技术探讨 发布时间 : 2022-12-20
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