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MOSFETS </a> </div> </div> <div class="rig_con"> <div class="top"> <h1 class="title"> PPTC自恢复保险丝“选型”需注意这“四点”-干货 </h1> <div class="meg"> <div class="firsts">发布时间：2021-09-06</div> <div class="">已被浏览：<span>335</span>次</div> <div class="shape"> <span>分享到：</span> <div class="bdsharebuttonbox" style="display:inline-block;vertical-align:middle;"><a href="#" class="bds_more" data-cmd="more"></a><a href="#" class="bds_qzone" data-cmd="qzone" title="分享到QQ空间"></a><a href="#" class="bds_tsina" data-cmd="tsina" title="分享到新浪微博"></a><a href="#" class="bds_sqq" data-cmd="sqq" title="分享到QQ好友"></a><a href="#" class="bds_weixin" data-cmd="weixin" title="分享到微信"></a><a href="#" class="bds_renren" data-cmd="renren" title="分享到人人网"></a></div> <script> window._bd_share_config={"common":{"bdSnsKey":{},"bdText":"","bdMini":"2","bdMiniList":false,"bdPic":"","bdStyle":"0","bdSize":"16"},"share":{}};with(document)0[(getElementsByTagName('head')[0]||body).appendChild(createElement('script')).src='http://bdimg.share.baidu.com/static/api/js/share.js?v=89860593.js?cdnversion='+~(-new Date()/36e5)]; </script> </div> </div> </div> <div class="con"> <span style="font-family:新宋体,arial;"><span style="font-size:16px;"><span style="line-height:200%;">PPTC<a href="http://www.unity4iran.com/products/category-88/"><span style="color:#FF0000;"><strong>自恢复保险丝</strong></span></a>选型时要注意哪些问题？释义如下。</span></span></span><br /> <img alt="PPTC自恢复保险丝“选型”需注意这“四点”-干货" src="/u_file/2103/photo/2103/2021032910500651.jpeg" /><br /> <span style="font-family:新宋体,arial;"><span style="font-size:16px;"><span style="line-height:200%;">一、PPTC自恢复保险丝的正常工作电压<br /> 解析：首先，我们需要知道PPTC自恢复保险丝在产品中使用的位置(如输入、输出、信号端、控制端等)，确定PPTC自恢复保险丝在该位置?；ず笏惺艿牡缪狗段?在PPTC自恢复保险丝串联的电路中，电路的电流异常时，PPTC自恢复保险丝在一定的时间范围内)。从低电阻跳跃到高电阻，阻止异常大电流的流动，?；ず笮缏访馐艽蟮缌鞯钠苹凳?，电路的电压几乎全部附加在PPTC自恢复保险丝上。(这是选择的基本条件。<br /> <br /> 二、产品的正常工作电流<br /> 解析：为了充分了解PPTC自恢复保险丝的正常工作电流，如果对此了解不够，将导致选择错误，需注意一下两点即可。<br /> （1）要特别注意，在了解产品正常工作电流的初期，往往不是特别准确。因为电子工程师在选择设备型号时，往往会自然习惯性地扩大参数。例如，实际测量值为0.42A，但习惯性定为0.5A，考虑到保险的起见，有可能扩大到0.8A。这是电子工程师在PPTC自恢复保险丝选择时的通常习惯。<br /> <br /> （2）对于一些产品，当电流不是恒定的时候，产品的最大电流往往是正常的工作电流，所以此时需要了解以下几点。<br /> A、产品长时间工作的电流<br /> B、最大电流的持续时间<br /> C、最大电流的重复频率(时间间隔)<br /> <br /> 产品最大峰值电流不大(2倍以下)，持续时间不长(1~2秒)，重复时间间隔长(20秒以上)时，可选择PTC热敏电阻平时的电流作为正常工作电流值。<br /> <br /> 对产品最大电流持续时间较长(超过30秒)，应选择产品最大峰值电流作为正常工作电流值。<br /> <br /> 对于产品的最大电流持续时间不是很长，但重复时间间隔相对较短(小于5秒)，应选择小于产品的最大电流值作为正常工作电流。<br /> <br /> 电流选择的正确性关系到集电通保险丝?；さ男Ч欠褡罴?。<br /> <br /> 三、了解产品的环境温度范围<br /> 解析：要知道PPTC恢复保险丝的工作温度范围，是在高温环境下工作，还是PPTC自恢复保险丝旁边有发热源(例如电力设备、散热器等)，根据产品使用的环境温度，查看PPTC自恢复保险丝的环境温度和电流折扣率表，并根据以下公式计算:<br /> <br /> Ih=正常工作电流/环境温度和电流的折扣率。<br /> <br /> 通过计算结果，查看产品手册，找到最接近的型号。<br /> <br /> 四、动作时间(?；に枋奔?<br /> 有些产品会对运行时间提出一些要求，应根据产品的要求，通过实验确定保险丝的电阻范围。在此之前，我们应该了解产品的故障电流(即产品需要?；さ牡缌髦?。在上述确定的型号中，选择电阻值最小的PPTC自恢复保险丝进行实验，确定PPTC自恢复保险丝的最小电阻值。<br /> <br /> 以上内容主要介绍PPTC自恢复保险丝选型时需注意问题，如需要自恢复保险丝相关产品请留言联系或<span style="color:#FF0000;">拨打：0755-28100016；</span>海量自恢复保险丝现货库存，规格齐全?；队醋裳鄹窕蚰醚馐?。<br /> <br /> 深圳顺?？萍加邢薰臼且患乙源砦鞯牡缱釉骷?、半导体器件、?；て骷恼瞎┯ι?，主营TVS瞬态抑制二极管、ESD静电?；て?、GDT陶瓷气体放电管、TSS半导体放电管、NTC热敏电阻、压敏电阻、保险丝、合金电阻、贴片电阻、精密电阻、晶圆电阻、贴片保险丝、自恢复保险丝、贴片电容、钽电容、电解电容、铝电解电容、超级电容、连接器等相关产品线，品牌可选华德、硕凯、萨瑞微、亿能、特思嘉、基美(KEMET)、天二、旺诠、大毅、村田、太诱、TDK、AVX、威世、风华、华新科、三莹、国巨、立隆、厚声、光颉、顺络、麦捷、禾伸堂等知名品牌。</span></span></span> </div> <div id="page" class="wow fadeInUp wrap"> <div class="page-btn prev">上一篇 : <a href="/faq/news-i01523i1.html">简述有机物型、瓷管型、壳型的温度保险丝构成方式</a></div> <div class="page-btn next">下一篇 : <a href="/faq/news-i01521i1.html">浅析“有机物型”及“合金型”的温度保险丝原理</a></div> </div> <div class="returns"> <a href="/faq/category-12/page-11.html" class="returns"><img oncontextmenu="return 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