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target="_blank">专业论文</a> >> <span>正文</span></div> <!-- main_content begin--> <div id="" class="maincontent"> <!-- left begin --> <div id="" class="news_left"> <div id="" class="brand_news_details"> <h1>电流检测技术综?/h1><table style="border-bottom:1px dotted #e4e4e4;" align="center"><tr><td><div id="" class="news_mes">文章来源:【工业电器网?作者:??点击?span id="HitNum"></span>?时间?span id="dTime">2019/3/18 15:18:33</span><input type="hidden" id="ID" value="100893515"/><input type="hidden" id="TypeID" value="2"/></div> </td> <td><div id="ckepop"></div></td></tr></table><div id="Content" style="display:none;">[电流检测技术综述]:(浙江巨磁智能技术有限公?magtron lennon)摘要:现如今,电流检测的技术在工业发展的推动下日臻完善。然而并不是传统的方案就不可取,在不同的应用环境下还是有一席用武之地。电流检测之后通常?..</div><div id="" class="brand_news_con"><p style="text-align:center;color:#333333;font-family:Arial, "font-size:16px;">北京pk10赛车网址 (浙江巨磁智能技术有限公?magtron lennon) </p> <p style="color:#333333;font-family:Arial, "font-size:16px;"> <br /> </p> <p style="color:#333333;font-family:Arial, "font-size:16px;">   摘要:现如今,电流检测的技术在工业发展的推动下日臻完善。然而并不是传统的方案就不可取,在不同的应用环境下还是有一席用武之地。电流检测之后通常被用来执行测量“多大”电流和当电流“过大”时动作判断的两个基本功能?</p>   <strong>  一、欧姆定?/strong>     ?)分流电?   <img alt="" src="http://www.pvnews.cn/uploads/190318/2-1Z31Q01040256.png" style="width:286px;height:147px;" /><br />     这种拓扑结构,都存在一定的风险性,低端检测电路易对地线造成干扰;高端检测,电阻与运放的选择要求高?     检测电阻是最简单的电流测量方法,既可用于测量交流电流也可用于测量直流电流。用该方法进行电流测量的最大弊端是向待测回路中接入了电阻,造成了电能消耗(I^2*R)?   <img alt="" src="http://www.pvnews.cn/uploads/190318/2-1Z31Q011103K.png" style="width:389px;height:57px;" /> <br />   ?)TRACE电阻     由欧姆定律表明,导电体两端的电压与通过导电体的电流成正比。而对于电阻物质,该定律可以衍生为:J=σ(E + v × B)?     式中J是电流密度,E是电场强度,v是电荷流动速度,B是作用在电荷上的磁通量密度,σ为材料的导电性。此时上式又能简化为:J=σE     这方式采用电路中导体的自身的 TRACE电阻代替分流电阻测量电流也是一种可选择的电流测量方法?br />     <img alt="" src="http://www.pvnews.cn/uploads/190318/2-1Z31Q01141359.png" style="width:409px;height:68px;" /><br />     如果使用TRACE电阻,则需要高增益放大器来放大电压信号,但放大器的带宽性能一直未能突破的瓶颈?     众多的专家学者针对TRACE电阻的电流测试性能进行了大量研究,结果表明:金属铜具有典型的热漂移性,因此该测量方式在高精度的应用环境下并不适合?     ?)电感直流电?      电感直流电阻测量电路属于一种无损采样电路。该电路在采样前需要对其进行精准的调试;目前只适用于对电流进行粗略测量。通常用在开关电源无损电流测量和低压(小?1.5V )电流测量场合? <img alt="" src="http://www.pvnews.cn/uploads/190318/2-1Z31Q01221633.png" style="width:368px;height:159px;" />     <strong>  ?1 电感测量原理?/strong>   <strong>  二、法拉第电磁感应定律</strong>     电磁感应现象是指因磁通量变化产生感应电动势的现象,例如,闭合电路的一部分导体在磁场里做切割磁感线的运动时,导体中就会产生电流(感应电流)?     ?)罗氏线?     Rogowski Coil是一种可以直接套在被测量的导体上来测量交流电流的线圈。其实也就是一种特殊类型的互感器,通常用来测量交流高电压和瞬时电流?     任何封闭电路中感应电动势的大小,等于穿过这一电路磁通量的变化率,可表示为:   <img alt="" src="http://www.pvnews.cn/uploads/190318/2-1Z31Q01305B8.png" style="width:126px;height:65px;" /><br />     由安培环路定则,进而能得到罗氏线圈中的磁通量密度与待测电流之间的关系?   <img alt="" src="http://www.pvnews.cn/uploads/190318/2-1Z31Q0133D32.png" style="width:111px;height:71px;" /> <br />   B 是磁通量密度?r是罗氏环的半径,u0是磁常数,ic是待测电流?   <img alt="" src="http://www.pvnews.cn/uploads/190318/2-1Z31Q01352227.png" style="width:296px;height:250px;" /> <strong>?2 无磁芯罗氏线圈原理图</strong>     由于罗氏线圈的内部没有铁磁材料,线圈不能被驱动到饱和,因而是一种线性器件?     Rogowski线圈不仅能校准较低的电流,并且能在电流非常高的情况下使用。这也进一步降低了操作的难度和校准高电流的成本?     不过,该方式也有缺点:待测电流不在线圈中心时,以上原理依旧能够正常工作,只是会产生一定的误差?   <img alt="" src="http://www.pvnews.cn/uploads/190318/2-1Z31Q01431326.png" style="width:442px;height:259px;" /><br />   <strong>?3 测量误差与待测电流位置的关系</strong>     ?)变压器测量     相对于罗氏线圈,电流变压器测量最大的优势是输出端电压与待测电流成正比例关系;同时待测量线圈的位置变化对测量精度的影响得到了抑制。测量的输出信号可以无需放大器放大而直接使用模数变换器采样?   <strong>  三、磁效应</strong>     磁传感器是把磁场、电流、应力应变、温度、光等外界因素引起敏感元件磁性能变化转换成电信号,以这种方式来检测相应物理量的器件?     其被广泛用于现代工业和电子产品中以感应磁场强度来测量电流、位置、方向等物理参数。在现有技术中,有许多不同类型的传感器用于测量磁场和其他参数?     ?)霍尔电流传感器     霍尔效应(Hall effect)是指当固体导体(或者半导体)放置在一个磁场内,且有电流通过时,导体内的电荷载子受到洛伦兹力而偏向一边,继而产生电压(霍尔电压)的现象?     式中nq为电荷密度,d为导体的厚度? <img alt="" src="http://www.pvnews.cn/uploads/190318/2-1Z31Q0153OZ.png" style="width:128px;height:79px;" />     Hall器件是一种采用半导体材料制成的磁电转换器件。如果在输入端通入控制电流,当有一磁场B穿过该器件感磁面,则在输出端出现霍尔电势。       通过测量霍尔电势的大小间接测量载流导体电流的大小。因此,电流传感器经过了电-磁-电的绝缘隔离转换?   <img alt="" src="http://www.pvnews.cn/uploads/190318/2-1Z31Q01609352.png" style="width:365px;height:214px;" /><br /> <br /> <strong>?4 霍尔电流传感器基本原理图</strong>     ?)磁通门电流传感?     磁通门电流传感器具有超高的测量精度和良好的温度稳定性。但是其容易受到激励源带来的外界磁场的干扰。Guillermo等人采用激励绕组差分的形式,从而减小激励源带来的外界磁场的干扰。由于变压器效应,高频激励源会耦合到反馈绕组中对传感器产生噪声干扰。为了降低内外部磁场造成的干扰,传感器可以使用额外的磁芯和额外的线圈?   <strong><img alt="" src="http://www.pvnews.cn/uploads/190318/2-1Z31Q01645945.png" style="width:354px;height:283px;" /><br /> <br /> ?5 磁通门传感器基本原?/strong>     基本磁通门传感器,信号线圈?P 端输出的电压信号如下?   <img alt="" src="http://www.pvnews.cn/uploads/190318/2-1Z31Q01FM28.png" style="width:392px;height:79px;" />   ?)巨磁阻传感?     基于巨磁阻效应的传感器其感应材料主要有三层:即参考层(Reference Layer或Pinned Layer),普通层(Normal Layer)和自由层(Free Layer)?     GMR传感器基于巨磁电阻效应,即在外磁场的作用下传感器电阻会发生的变化。当磁场正向为零时,磁阻材料的电阻最大;在磁场正向或负向增大时,磁阻材料的电阻都减小?     从巨磁电阻GMR被发现以来,各应用已处于开发及实用化阶段,其首先在硬盘磁头上成功实现商品化,除直接测量磁场外,在电流、位移、线速度和加速度等物理量的测量也得到应用?   <strong><img alt="" src="http://www.pvnews.cn/uploads/190318/2-1Z31Q01IB36.png" style="width:295px;height:202px;" /><br /> <br /> ?6  巨磁阻传感器结构</strong>     巨磁阻电流传感器具有广阔的应用前景。其与传统电磁式电流互感器相比,能够测量直流到高?MHz量级)的电流信号,尤其是它能够测量直流电流,这对于直流输电系统中换流站中直流的监测极为有利?   <strong>  四、结?/strong>     不同方式的测量性能各有优缺点,除了电流变压器和罗氏线圈无法直接测量直流电流之外,其他测量方法都能够测量直流电流;Trace 电阻和电感电阻测量电流的方法并未在测量电路直接接入分流电阻,因此对待测量电路的影响相对较小;磁通门是目前测量精度最高的测量技术,且提供电气隔离和低能量损失等一些优点? </div><div id="" class="meneame"><span class="disabled">< </span><span class="current">1</span> </div> <div id="" style="text-align: center;padding-top: 10px;"><img src="/images/code.jpg" alt="关注有惊?" /></div> <div id="" class="news_bot_mes">中国工业电器网:此内容转载于合作媒体或互联网其它网站,中国工业电器网登载此文出于传递更多信息之目的,并不意味着赞同其观点或证实其描述!</br>新闻、技术文章投稿QQ?28246603 邮箱:news@yxbest.cn</div> <h2 class="related">相关阅读</h2> <ul class="related_con"> <li>· <a href="/text/32/190318/AD100893518_1.html" target="_blank">电气百科:母线“价格战”背后,猫腻还真?/a></li><li>· <a href="/text/1/190318/AD100893517_1.html" target="_blank">全球四大机器人巨头爱上重?扎堆生小“宝</a></li><li>· <a href="/text/32/190318/AD100893516_1.html" target="_blank">电气百科:变频器是否需要加进线、出线电?/a></li><li>· <a 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