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href="/info/industry/special/power">電源與新能源</a> > <a href="/info/articlelist/special/power/type/5">設(shè)計(jì)應(yīng)用</a> > 對(duì)基于力敏元件的天平系統(tǒng)偏移進(jìn)行補(bǔ)償?shù)碾娐?/p> </div> </div> </div>   <script src="https://forum.eepw.com.cn/jscontent/wenzilian" type="text/javascript"></script>  <div class="iddxnhi" id="container"> <section> <article> <h1>對(duì)基于力敏元件的天平系統(tǒng)偏移進(jìn)行補(bǔ)償?shù)碾娐?/h1> <div id="gfaialw" class="authorTimeSource"> <span>作者：</span> <span>時(shí)間：2009-12-23</span> <span>來(lái)源：網(wǎng)絡(luò)</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:150px;margin-right:0px; text-align:right;"> <div id="rnpfwmz" class="nav0"> <ul> <li style="width:150px;"><a href="javascript:void(0);"><img src="http://www.ex-cimer.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />英飛凌汽車電子生態(tài)圈</a> <ul> <li style="width:150px;text-align:center;"><img src="http://www.ex-cimer.com/event/company/images/code_2.jpg" width="150"><br />掃碼關(guān)注<br />獲取最新最全汽車電子<br />技術(shù)方案與實(shí)用技巧</li> </ul> </li> </ul> </div> </span> <span style="float:right; width:30px;margin-right:0px; text-align:right;"><a rel="nofollow">收藏</a></span> </div> <div id="ozenwaj" class="hAd4_Afinal20a_back">  <iframe id='a890e388' name='a890e388' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='660' height='60'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a></iframe> </div> <div style="margin-top:28px;"></div> <div id="mhnansk" class="content" id="contentDiv" style="position:relative;"> <div id="vkehcar" class="ad_300x180_Afinal13_back">  <iframe id='a225770a' name='a225770a' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='300' height='200'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;"><p>設(shè)計(jì)電阻橋式傳感器與5V單電源供電的ADC之間的接口是一個(gè)新的挑戰(zhàn)。有些應(yīng)用需要輸出電壓在0V到滿量程電壓（如4.096V）之間以高精度波動(dòng)。對(duì)大多數(shù)單電源儀表放大器，當(dāng)輸出信號(hào)接近0V、接近單電源低輸出擺幅限制時(shí)，會(huì)出現(xiàn)問(wèn)題。一個(gè)好的單電源儀表放大器可在接近于單電源地電壓的范圍內(nèi)擺動(dòng),即使有真正的滿擺幅輸出，也不能達(dá)到地電壓。</p>本文引用地址：<a href="http://www.ex-cimer.com/article/181127.htm">http://www.ex-cimer.com/article/181127.htm</a><p><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" height="227" alt="圖1此電路中的串接雙DAC在上電校準(zhǔn)程序運(yùn)行期間從微處理器獲得一個(gè)補(bǔ)償電壓" hspace="0" src="http://editerupload.eepw.com.cn/fetch/20131009/181127_1_0.jpg" width="458" border="0" /></p><p>　　在本應(yīng)用中，傳感器是一個(gè)精密的力敏<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/元件"><em>元件</em></a>，其額定負(fù)載為5kg，即約11磅。在鋁盤上測(cè)重大約為150g的物體，即大約5盎司。由于鋁盤自重，即使沒有任何物體稱重，儀表放大器的輸出信號(hào)也不能低到0V?，F(xiàn)在，問(wèn)題是如何<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/補(bǔ)償"><em>補(bǔ)償</em></a>儀表放大器的輸出偏移電壓和鋁盤本身產(chǎn)生的電壓。</p><p>　　軟件彌補(bǔ)<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/系統(tǒng)"><em>系統(tǒng)</em></a>偏移是最簡(jiǎn)單的方法。在加電期間，鋁盤上沒有稱重物體，<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/系統(tǒng)"><em>系統(tǒng)</em></a>可以獲取偏移電壓，并將數(shù)據(jù)記錄在微控制器內(nèi)存中。隨后，當(dāng)有物體稱重時(shí)，從獲得的數(shù)據(jù)中減去它即可。但是，這種做法不能達(dá)到<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/天平"><em>天平</em></a>的5kg滿量程，僅能達(dá)到4.85kg。</p><p>　　本設(shè)計(jì)實(shí)例說(shuō)明如何利用微控制器實(shí)現(xiàn)硬件<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/補(bǔ)償"><em>補(bǔ)償</em></a>。當(dāng)加電后，運(yùn)行軟件程序復(fù)位<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/系統(tǒng)"><em>系統(tǒng)</em></a>偏移。解決方案如圖1所示，<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/基于"><em>基于</em></a>四個(gè)來(lái)自Linear Technology公司IC的簡(jiǎn) 單<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電路"><em>電路</em></a>。精密電壓基準(zhǔn)IC1，有高達(dá)50mA的最小輸出電流。它提供4.096V輸出電壓驅(qū)動(dòng)力敏<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/元件"><em>元件</em></a>，并設(shè)置12位ADC（IC3）的滿量程范圍。高精度儀表放大器LT1789-1（IC2）的特點(diǎn)是在0℃~70℃溫度范圍內(nèi)，最大輸入失調(diào)電壓為150mV，滿擺幅輸出電壓相對(duì)地電壓110mV范圍內(nèi)擺動(dòng)時(shí)，最大輸入失調(diào)偏移電壓是0.5mV/℃。通過(guò)精密電阻R2 （阻值為500Ω）設(shè)定增益，當(dāng)稱重是5kg時(shí)，輸出范圍為4.096V，其最大輸入信號(hào)是VCC×S=4.096V×2mV/V=8.192mV，這里 S是該傳感器的靈敏度。</p><p>　　雙通道DAC（IC4）的DAC_A輸出在儀表放大器參考引腳處提供200mV的參考電壓，以避免放大器本身地飽和，但傳輸特性不是線性關(guān)系。放大器最壞情況下輸出偏移是：VREF+VPAN±VOFFSET=200mV+125mV±500×150mV= 325mV±75mV=250mV/400mV，這里VPAN=125mV，是鋁盤自重產(chǎn)生的電壓值。</p><p>　　因此系統(tǒng)輸出偏移是250mV 到400mV。加電后，微控制器運(yùn)行一個(gè)程序設(shè)置DAC_A輸出為200mV，同時(shí)，增加雙通道DAC（IC4）的DAC_B輸出直到等于ADC （IC3）管腳2上的系統(tǒng)偏移，轉(zhuǎn)換結(jié)果就是000h。這一結(jié)果是可能的，因?yàn)镮C4包含兩個(gè)12位2.5V滿量程電壓的DAC，最低有效位（LSB）等于0.61mV，小于分辨率為1mV的IC3。這個(gè)數(shù)字相當(dāng)于該<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/天平"><em>天平</em></a>的分辨率：5000g/4096=1.22g。當(dāng)最大負(fù)載5kg時(shí)，儀表放大器的最大輸出電壓是4.096V + VOUT_TOTAL_OFFSET_INA = 4.346V/4.496V，低于4.62V高飽和狀態(tài)下溫度的最壞情況。</p><p>　　IC3有一個(gè)單極差分輸入，所以可以從+IN輸入電壓中減去一個(gè)恒定電壓值等于IC4的DAC_B提供的系統(tǒng)偏移。在第一個(gè)半時(shí)鐘周期內(nèi)，ADC采樣和保持正向輸入電壓。這階段結(jié)束，或在采集時(shí)間內(nèi)，輸入電容切換到負(fù)輸入并開始轉(zhuǎn)換。在IC3輸入端的RC輸入濾波器的時(shí)間常數(shù)為0.5ms，允許正負(fù)輸入電壓采用最高為200kHz時(shí)鐘頻率在轉(zhuǎn)換時(shí)間的第一時(shí)鐘周期內(nèi)達(dá)到12位精度。如果想增加時(shí)間常數(shù)，必須采用較低時(shí)鐘頻率。</p><p>　　此外，DAC和ADC有一個(gè)三線串行接口，可方便地將數(shù)據(jù)傳輸?shù)阶罡卟蓸勇蕿?2.5kS/s的寬范圍微控制器。當(dāng)ADC處于沒有轉(zhuǎn)換的時(shí)候，它會(huì)自動(dòng)把功率降至1nA的電源電流，而且如果微控制器通過(guò)其引腳3來(lái)關(guān)閉 IC1，<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電路"><em>電路</em></a>限制電源電流在最壞情況下僅為1mA，因?yàn)樗械腎C集成<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電路"><em>電路</em></a>都是微功耗的。 </p></span>  <div class="ttcouhm" 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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