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type="text/css"/> <span style="float:right; width:130px;margin-right:0px; text-align:right;"> <div id="3tv9ppd" class="nav0"> <ul> <li><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" />加入技術交流群</a> <ul> <li style="text-align:center;"><img src="http://www.ex-cimer.com/event/company/images/code_1.jpg" width="130"><br />掃碼加入<br />和技術大咖面對面交流<br />海量資料庫查詢</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="99pjl91" 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="npzbx9b" class="content" id="contentDiv" style="position:relative;"> <div id="p999fv9" class="editorNote"> <strong>編者按</strong>：設計在家中護理患者的醫(yī)療系統(tǒng)時，無線醫(yī)療儀器的系統(tǒng)架構面臨著很多技術障礙。潛在的噪聲干擾問題必須減輕，凌力爾特針對有些主電池應用需要非常低的靜態(tài)電流，還需要知道有關剩余電池電量的信息設計了LTC3335 。就噪聲敏感型設計了LT8602。 </div> <br/> <div id="px39399" 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><strong>摘要</strong>：設計在家中護理患者的醫(yī)療系統(tǒng)時，<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/無線醫(yī)療儀器"><em>無線醫(yī)療儀器</em></a>的系統(tǒng)架構面臨著很多技術障礙。潛在的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/噪聲干擾"><em>噪聲干擾</em></a>問題必須減輕，凌力爾特針對有些主電池應用需要非常低的靜態(tài)電流，還需要知道有關剩余電池電量的信息設計了<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/LTC3335"><em>LTC3335</em></a> 。就噪聲敏感型設計了<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/LT8602"><em>LT8602</em></a>。</p>本文引用地址：<a href="http://www.ex-cimer.com/article/201603/288916.htm">http://www.ex-cimer.com/article/201603/288916.htm</a><p><strong>引言</strong></p><p>　　像很多其他應用所遇到的情況一樣，低功率高精度組件也使便攜式和<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/無線醫(yī)療儀器"><em>無線醫(yī)療儀器</em></a>出現(xiàn)了快速增長。然而，與很多其他應用不同，多數(shù)醫(yī)療產(chǎn)品的可靠性、運行時間和堅固性標準通常高得多。正如大家預料的那樣，這種高標準帶來的負擔大部分落在電源系統(tǒng)以及與其相關的支持性組件上。</p><p>　　醫(yī)療產(chǎn)品必須正確運行，并在各種電源之間無縫切換，例如 AC 電源、備份電池甚至收集的環(huán)境能源。此外，必須不遺余力地針對故障提供保護并承受故障，在由電池供電時最大限度延長運行時間，并確保無論何時，只要存在有效的電源，系統(tǒng)就能正?？煽康剡\行。</p><p>　　目前促進便攜式和<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/無線醫(yī)療儀器"><em>無線醫(yī)療儀器</em></a>增長的主要趨勢之一是患者護理，尤其是越來越多地在患者家中使用遠程監(jiān)視系統(tǒng)。出現(xiàn)這種趨勢的主要原因純粹是經(jīng)濟性的，也就是說，讓患者住院的成本不斷提高，簡直令人望而卻步。因此，很多這類便攜式電子監(jiān)視系統(tǒng)必須采用RF發(fā)射器，以便所收集的任何患者數(shù)據(jù)都能夠直接發(fā)回醫(yī)院中的監(jiān)察系統(tǒng)，以供主管醫(yī)生立即或稍后查看及分析。</p><p>　　考慮到這種典型情況，做出以下假定是合理的：與讓患者住院觀察相比，提供給患者合適的醫(yī)療儀器供其在家中使用，成本更低。不過，供患者在家中使用的設備必須可靠且簡便易用，這是極為重要的。因此，這類產(chǎn)品的制造商和設計師必須確保產(chǎn)品能夠無縫地用多種電源運行，同時還要確保非常可靠地將無線數(shù)據(jù)傳回醫(yī)院。這就要求系統(tǒng)設計師設計電源管理架構時非常謹慎。這種架構必須是堅固、靈活、緊湊和高效率。</p><p><strong>1 潛在問題和解決方案</strong></p><p>　　系統(tǒng)設計師在提供無線傳送功能的系統(tǒng)中使用線性穩(wěn)壓器這種情況并非不常見。主要原因是，使用線性穩(wěn)壓器可以最大限度降低 EMI 和噪聲輻射。不過，盡管開關穩(wěn)壓器產(chǎn)生的噪聲比線性穩(wěn)壓器大，開關穩(wěn)壓器的效率卻遠遠高于線性穩(wěn)壓器。已經(jīng)證明，在很多敏感型應用中，只要開關行為是可預測的，噪聲和 EMI 水平就是可控的。如果開關穩(wěn)壓器在正常工作模式以恒定頻率切換，而且轉(zhuǎn)換邊沿是干凈和可預測的，沒有過沖或高頻振鈴，那么就可以最大限度減小 EMI。此外，小尺寸封裝和高工作頻率也可以實現(xiàn)占板面積很小的緊湊布局，這也最大限度減小了 EMI 輻射。還有，如果開關穩(wěn)壓器可以與低 ESR 陶瓷電容器一起使用，那么輸入和輸出電壓紋波都可以最大限度降低，而這些紋波是系統(tǒng)中額外的噪聲源。</p><p style="text-align:center"><img src="http://editerupload.eepw.com.cn/201604/72691460092205.jpg" style="width:500px;height:260px;" title="無線醫(yī)療1.jpg" width="500" height="260" border="0" hspace="0" vspace="0" /></p><p>　　今天功能豐富的醫(yī)療設備的主輸入電源通常采用來自外部 AC/DC 適配器的 24V 或 12V DC 電源。然后，利用同步降壓型轉(zhuǎn)換器，進一步將這個電壓降至 5V 和/或 3.xV 電源軌。不過，在這些醫(yī)療設備中，在運行電壓不斷降低的同時，內(nèi)部進行后置穩(wěn)壓的電源軌數(shù)量也在增加。因此，很多這類系統(tǒng)還需要 3.xV、2.xV 或 1.xV 軌，以給低功率傳感器、存儲器、微控制器內(nèi)核、I/O 和邏輯電路供電。此外，既然醫(yī)療設備的正常運行常常是至關重要的，因此很多醫(yī)療設備常常采用電池備份系統(tǒng)，以在其主電源由于某種原因出現(xiàn)故障時，確保設備正常運行。</p><p>　　傳統(tǒng)上，較低電壓軌一直由降壓型開關穩(wěn)壓器或低壓差穩(wěn)壓器供電。然而，這類 IC 不能利用電池的全部運行范圍，因此縮短了設備電池的潛在運行時間。而使用降壓-升壓型轉(zhuǎn)換器時 (這種轉(zhuǎn)換器可以對可變的輸入源升壓或降壓)，可以利用電池的全部運行范圍。那么由于獲得了更多可用電池容量，因此提高了運行裕度，延長了電池運行時間，尤其是在接近放電曲線的較低端時。</p><p>　　顯然，滿足主電池系統(tǒng)應用需求并解決上述相關問題的 DC/DC 轉(zhuǎn)換器解決方案應該具備以下特性：</p><p>　　? 具備寬輸入電壓范圍的降壓-升壓型電源轉(zhuǎn)換架構，以在使用各種電池供電電源時，在其相關電壓范圍內(nèi)調(diào)節(jié)輸出電壓;</p><p>　　? 無論運行時還是停機時具備超低靜態(tài)電流，以延長電池運行時間;</p><p>　　? 能夠高效地給系統(tǒng)電壓軌供電;</p><p>　　? 能夠準確地進行庫倫計數(shù)而不會顯著影響 IC 靜態(tài)電流 (電池電量消耗)，以確定剩余電池電量;</p><p>　　? 電流限制以衰減浪涌電流，從而保護電池;</p><p>　　? 占板面積很小、重量很輕的扁平解決方案;</p><p>　　? 先進的封裝以提高熱性能和空間利用率。</p><p>　　凌力爾特最近推出了一款毫微功率 <a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/LTC3335"><em>LTC3335</em></a> 降壓-升壓型轉(zhuǎn)換器，該器件集成了庫倫計數(shù)器，具備上述所有屬性。有些主電池應用需要非常低的靜態(tài)電流，還需要知道有關剩余電池電量的信息，<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/LTC3335"><em>LTC3335</em></a> 是為這類應用而設計。另外，LTC3335 也適用于將庫倫計數(shù)器作為檢查系統(tǒng)故障的手段，以檢測潛在電池組件或負載泄漏。參見圖 1。</p><p>　　LTC3335 是一款毫微功率高、效率同步的降壓-升壓型轉(zhuǎn)換器，內(nèi)置了精確的庫倫計數(shù)器，可提供高達 50mA 連續(xù)輸出電流。憑借僅為 680nA 的靜態(tài)電流和從 5mA 直至 250mA 的可編程峰值輸入電流，該器件非常適合多種低功率電池應用。例如電池備份、便攜式健康監(jiān)視系統(tǒng)之類的應用。其 1.8V 至 5.5V 輸入范圍和 8 個 1.8V 至 5V 用戶可選輸出可提供一個穩(wěn)定的輸出電源，且輸入電壓可高于、低于或等于輸出電壓。</p><p>　　此外，該器件集成了精確 (±5% 電池放電測量準確度) 的庫倫計數(shù)器，在長壽命、不可再充電電池供電應用中，該計數(shù)器可用來準確監(jiān)視累計的電池放電量，這類應用在很多情況下都有極其平坦的電池放電曲線。LTC3335 包括 4 個內(nèi)部低 RDSON MOSFET，可提供高達 90% 的效率。其他特點包括可編程放電報警門限、一個用來訪問庫倫計數(shù)值和器件編程的 I2C 接口、一個電源良好標記輸出和 8 個從 5mA 至 250mA 的可選峰值輸入電流，以適應多種類型和尺寸的電池。LTC3335 的工作結(jié)溫度范圍為-40℃至 +125℃，采用耐熱性能增強型20引線 3mm x 4mm QFN 封裝。</p><p style="text-align:center"><img src="http://editerupload.eepw.com.cn/201604/57841460092206.jpg" title="無線醫(yī)療2.jpg" width="450" height="474" border="0" hspace="0" vspace="0" style="width:450px;height:474px;" /></p><p>　　用一個 24V 或 12V DC 輸入獲得一組低壓軌的另一種方法是，采用一個具有多輸出能力的高壓 DC/DC 轉(zhuǎn)換器。因此，凌力爾特開發(fā)了 4 輸出單片同步降壓型轉(zhuǎn)換器 <a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/LT8602"><em>LT8602</em></a>。其 3V 至 42V 的輸入電壓范圍使該器件非常適合醫(yī)療應用。正如在圖 2 中看到的那樣，其 4 通道設計整合了兩個高壓 2.5A 和 1.5A 通道與兩個較低電壓的 1.8A 通道，以提供 4 個獨立的輸出，并可提供低至 0.8V 的電壓，從而使該器件能夠驅(qū)動目前市場上電壓最低的微處理器內(nèi)核。該器件的同步整流拓撲提供高達 94% 的效率，同時以突發(fā)模式 (Burst Mode?) 運行可在無負載備用條件下保持靜態(tài)電流低于30μA (所有通道均接通)，從而使該器件非常適合電池供電系統(tǒng)。</p><p>　　就噪聲敏感型應用而言，僅采用一個小型外部濾波器，<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/LT8602"><em>LT8602</em></a> 就可以運用其脈沖跳躍模式以最大限度降低開關噪聲，并可滿足 CISPR25 Class 5 EMI 要求。這使該器件能夠便利地用于無線傳送數(shù)據(jù)的系統(tǒng)。</p><p>　　LT8602 的開關頻率可在 250kHz 至 2MHz 范圍內(nèi)設定，并可在這個范圍內(nèi)同步。該器件具有60ns 最短接通時間，能夠以 2MHz 開關頻率在高壓通道上實現(xiàn) 16VIN 至 2.0VOUT 的降壓轉(zhuǎn)換。當高壓 VOUT2 通道向兩個低壓通道 (VOUT3 和 VOUT4) 供電，且這兩個低壓通道以 2MHz 頻率切換時，可提供低至 0.8V 的輸出，因此該器件可構成非常緊湊 (在單面電路板上約占 25mm x 25mm 面積) 的 4 輸出解決方案，如圖3所示。</p><p style="text-align:center"><img src="http://editerupload.eepw.com.cn/201604/90681460092206.jpg" title="無線醫(yī)療3.jpg" width="260" height="333" border="0" hspace="0" vspace="0" style="width:260px;height:333px;" /></p><p>　　除了最大限度減小解決方案占板面積，LT8602 的 2MHz 開關頻率還使設計師能夠避開關鍵噪聲敏感頻段。LT8602 的每個通道在所有條件下都保持僅為 200mV (在 1A) 的最小壓差電壓，從而使該器件能夠在汽車冷車發(fā)動等情況下表現(xiàn)出色。針對每個通道的可編程加電復位和電源良好指示器有助于確保系統(tǒng)的總體可靠性。LT8602 的 40 引線耐熱性能增強型 6mm x 6mm QFN 封裝和高開關頻率允許使用小型外部電感器和電容器，從而可構成占板面積緊湊的高熱效率解決方案。此外，獨特的設計方法和新型高速工藝使該器件在很寬的輸入電壓范圍內(nèi)實現(xiàn)了高效率，而且 LT8602 的電流模式拓撲實現(xiàn)了快速瞬態(tài)響應和卓越的環(huán)路穩(wěn)定性。</p><p><strong>2 結(jié)論</strong></p><p>　　顯然，設計在家中護理患者的醫(yī)療系統(tǒng)時，無線醫(yī)療儀器的系統(tǒng)架構面臨著很多技術障礙。潛在的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/噪聲干擾"><em>噪聲干擾</em></a>問題必須減輕，必須提供電池備份運行能力以防主電源出故障，而且需要控制尺寸和成本。幸運的是，凌力爾特公司提供了大量適用的解決方案，以滿足這些設計要求。</p><p><br /></p><p><strong><span style="font-size:16px;font-family:微軟雅黑, sans-serif;">本文來源于中國科技期刊《電子產(chǎn)品世界》<span lang="EN-US">2016</span>年第<span lang="EN-US">3</span>期第<span lang="EN-US">73</span>頁，歡迎您寫論文時引用，并注明出處。</span></strong></p></span>  <div class="hj9hlzh" id="coverDiv" class="article_reg" style="width:100%;overflow:hidden;display:none;z-index:10;position:absolute;left:0;background:#fff;"> <center> <img src="https://webstorage.eepw.com.cn/images/display/reg.jpg" border="0" usemap="#Map" /> <map name="Map" id="Map"> <area shape="rect" 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