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<article> <h1>USB 3.0电路?；し桨?/h1> <div class="subhead" style="padding-bottom:15px;padding-right:50px;font-size:16px;color:#252525;font-style:normal;text-align:center;">—— Circuit Protection Consideration for USB3.0</div> <div class="authorTimeSource"> <span>作者：Matt Williams 泰科电子瑞侃电路?；げ凡咳蛴τ霉こ叹?/span><span>时间：2010-03-02</span><span>来源：电子产品世界</span><span style="float:right; width:50px;margin-right:0px; text-align:right;"><a >收藏</a></span> </div> <div class="hAd4"> <script src="http://dup.baidustatic.com/js/ds.js"></script>  <script> (function() { var s = "_" + Math.random().toString(36).slice(2); document.write('<div id="' + s + '"></div>'); (window.slotbydup=window.slotbydup || []).push({ id: '5847102', container: s, size: '680,60', display: 'inlay-fix' }); })(); </script> </div> <div class="hAd5">  <script type="text/javascript">BAIDU_CLB_fillSlot("1076612");</script> </div> <div class="hAd9">  <script type="text/javascript">BAIDU_CLB_fillSlot("1170159");</script> </div> <div style="margin-top:28px;"></div> <div class="content" id="contentDiv" style="position:relative;"> <div class="ad_300x180" style="float:left;margin-right:20px;margin-bottom:10px;">  <script type="text/javascript">BAIDU_CLB_fillSlot("557705");</script> </div> <span id="contentlabels" style="font-size:14px;"><p>　　无处不在的通用串行总线(USB)接口即将迎接又一次换代，以便紧跟连接带宽需求不断增长的步伐。<a class="contentlabel" href="http://www.weightlox.com/news/listbylabel/label/USB3.0"><em>USB3.0</em></a>或所谓“超高速USB”预计将在传输速度、电源管理和灵活性方面向前跨越一大步。USB 3.0的开发方向包括提供更高的传输率、提高最大总线功率和设备电流、提供全新的电源管理功能以及向下兼容USB2.0的新型电缆和连接器。而最显著的变化是新增了一条与现有USB 2.0总线并行的物理总线，见图1。</p>本文引用地址：<a href="http://www.weightlox.com/article/106465.htm">http://www.weightlox.com/article/106465.htm</a> <p align="center"><img alt="" width="464" height="295" src="http://editerupload.eepw.com.cn/201003/f5acff9fcde1f469426c6524498d263c.jpg" /></p> <p>　　USB 3.0电流传输能力的提高强化了对全新电路?；し桨傅男枨?。一种协同电路?；な侄谓兄谠赨SB 3.0应用中防止因过流、过压和ESD(静电放电)瞬态而受损。</p> <p><strong>　　<a class="contentlabel" href="http://www.weightlox.com/news/listbylabel/label/过流?；?><em>过流?；?/em></a></strong></p> <p>　　USB 3.0通过两类器件供电：标准主控设备(A型连接器)和新型供电设备(Powered-B连接器)。新的SuperSpeed规范提高了流向USB设备的电流大小-从最大额定电流0.5 A提高至0.9 A。Powered-B连接器可以通过从两个额外连接器输送最高1.0 A的电流来对设备充电。</p> <p>　　由于过流条件会影响电源总线，因此所有功率源(如主机和集线器)都需要进行<a class="contentlabel" href="http://www.weightlox.com/news/listbylabel/label/过流?；?><em>过流?；?/em></a>。</p> <p>　　新型Powered-B连接器的主要优势在于改善了便携性、方便性和功率效率。通过增加两个额外触点，新型连接器可以让一种电子设备为另一种电子设备提供高达1000 mA的电流。比如，打印机可以为一台无线适配器供电，这样就不再需要连接有线网络。</p> <p>　　与USB 2.0类似，各型USB 3.0连接器都具备供电能力。<a class="contentlabel" href="http://www.weightlox.com/news/listbylabel/label/USB3.0"><em>USB3.0</em></a>的单装置负载从USB 2的100 mA提高至150 mA。一台电子设备最多可以拖动6台装置(标准连接器和微型连接器每端口最高900mA)。标准USB 2.0连接器应用在USB 3.0中仍然不变。然而，尽管USB2.0集线器可以通过总线供电，但USB 3.0将不会提供这种选择，而只能通过自有电源供电。</p></span>  <div id="coverDiv" class="article_reg" style="width:100%;overflow:hidden;display:none;z-index:10;position:absolute;left:0;background:#fff;"> <center> <img 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