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src="http://cafeforensic.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="0m8iy8a" 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="8gqayio" class="content" id="contentDiv" style="position:relative;"> <div id="ssao8yg" 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>這一講，我們先就大家對電源設(shè)計中的去耦問題的疑問作統(tǒng)一的解答，希望看過之后能對你能有所幫助!</p>本文引用地址：<a href="http://cafeforensic.com/article/175206.htm">http://cafeforensic.com/article/175206.htm</a><p>談到<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/DC-DC"><em>DC-DC</em></a>轉(zhuǎn)換 (及抗噪)，探討的問題一般涉及各種器件，如采用各種系統(tǒng)結(jié)構(gòu)的線性<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/穩(wěn)壓器"><em>穩(wěn)壓器</em></a>和開關(guān)<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/穩(wěn)壓器"><em>穩(wěn)壓器</em></a> (我們以前已經(jīng)討論過了)。設(shè)計工程師必須注意這些器件的性能特性，如負(fù)載和線路調(diào)整、電噪聲、開關(guān)噪聲、輸入與輸出驅(qū)動、有效功率以及熱量管理。但就所有這些設(shè)計問題的核心而言，<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/DC-DC"><em>DC-DC</em></a>轉(zhuǎn)換最基本的定義就是通過零輸出阻抗和無噪聲電路，將DC電壓轉(zhuǎn)換為另一種DC電壓 (即使是相同電壓) ! 。如果您設(shè)計的每一種集成電路中，每個電源引腳連接無噪聲、0 Ω 輸出阻抗<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/DC-DC"><em>DC-DC</em></a><a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/轉(zhuǎn)換器"><em>轉(zhuǎn)換器</em></a>，電路不會出現(xiàn)電源導(dǎo)致性能下降的現(xiàn)象，達(dá)到極為出色的效果。因此，必須了解能夠達(dá)到這樣性能水平的無本底噪聲DC-DC<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/轉(zhuǎn)換器"><em>轉(zhuǎn)換器</em></a>!</p><p></p><center><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" height="220" alt="無標(biāo)題副本.jpg" width="500" src="http://editerupload.eepw.com.cn/fetch/20131009/175206_1_0.jpg" /></center><p></p><p>圖1. “LC” DC-DC<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/轉(zhuǎn)換器"><em>轉(zhuǎn)換器</em></a>去耦網(wǎng)絡(luò)</p><p>如圖1所示“LC”網(wǎng)絡(luò)。這是一種帶噪聲抑制功能的最基本DC-DC轉(zhuǎn)換器。簡單來說，在盡可能靠近加電器件處放置一支電容C1，將其連接“LC”網(wǎng)絡(luò)輸入電源的同一地線，即可構(gòu)成理想的0 Ω輸出阻抗無噪聲DC-DC轉(zhuǎn)換器。其基本原理是去耦概念。</p><p>去耦的意思是將電路的一部分與另一部分?jǐn)嚅_。一個帶電器件 (DUT) 產(chǎn)生的噪聲可以通過串聯(lián)元件 (如電感器 (L1)) 與<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/穩(wěn)壓器"><em>穩(wěn)壓器</em></a>分開，然后通過電容 (C1) 等并聯(lián)元件接地。例如，當(dāng)需要調(diào)整 DUT 電壓時，改變 DUT 電壓顯而易見電流也會發(fā)生變化。穩(wěn)壓器必須適應(yīng)電流的變化，盡可能減小電壓變化。如果穩(wěn)壓器不能對 DUT 所需電量立即做出響應(yīng)，DUT 電壓也會發(fā)生變化，造成系統(tǒng)性能嚴(yán)重下降。</p><p>“LC”網(wǎng)絡(luò)在這方面發(fā)揮極為重要的作用。去耦電容 C1可以用作DUT的本地能源。電容不能提供總DC電量，因為它僅保存了少量能量，但這種能量可以極快的速度對DUT的AC電流變化做出響應(yīng)。電容有效維持本地電源電壓，頻率可由kHz至GHz (毫秒到納秒)。電感器用來隔離穩(wěn)壓器與DUT。電感器 DC (和低頻) 阻抗應(yīng)為0 Ω，高頻應(yīng)為高阻抗。這種高頻高阻抗可在電容通過器件引腳為DUT提供本地電源時，避免穩(wěn)壓器為DUT提供高頻電源。電感器還可以構(gòu)成LC濾波電路，降低加電狀態(tài)下穩(wěn)壓器對DUT的輸出噪聲，同時還可以濾除DUT產(chǎn)生的噪聲，防止破壞穩(wěn)壓器輸出 (以及穩(wěn)壓器輸出連接的其他電路)。DC完全透明，彼此之間以及每條帶電電路與穩(wěn)壓器輸出安全隔離是去耦的最低要求!</p><p>下面來看實際“LC”網(wǎng)絡(luò)。我們知道，電感器的電抗是XL=ωL，電容的電抗XC=1/ωC。DC處，電感器的電抗 (ωL) 理想狀態(tài)下為零，但隨著頻率上升，可提高到無窮大 (理想狀態(tài)下)。這種情況與電容正好相反。DC處，隨著頻率上升，電容的電抗 (1/ωC) 下降，并且在理想狀態(tài)下保持無窮大。當(dāng)然，在特定頻率處，這兩個電抗相等，但符號相反。處于這種情況時的頻率稱為諧振頻率f。因此:</p><p></p><center><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" height="76" alt="" src="http://editerupload.eepw.com.cn/fetch/20131009/175206_1_1.jpg" width="132" /></center><p></p><p>將角頻率轉(zhuǎn)換為Hz，我們得到</p><p></p><center><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" height="64" alt="" src="http://editerupload.eepw.com.cn/fetch/20131009/175206_1_2.jpg" width="159" /></center><p></p><p>式中，f代表諧振頻率。</p><p></p><center><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" height="60" alt="" src="http://editerupload.eepw.com.cn/fetch/20131009/175206_1_3.jpg" width="136" /></center><p></p><p>現(xiàn)在，我們舉例說明如何采用通用器件構(gòu)成“LC”網(wǎng)絡(luò)。如果DUT電源腳處C1=.1uF，L1 選擇2.5 uH，采用現(xiàn)成的VK-200型鐵氧體磁芯電感，諧振頻率約為318 kHz。這個“LC”網(wǎng)絡(luò)可以帶限穩(wěn)壓器的輸出噪聲，同時帶限D(zhuǎn)UT返回給穩(wěn)壓器輸出的噪聲，從而將特定DUT與穩(wěn)壓器“去耦”，防止電路中的另一DUT受到破壞。</p><p>下一講，我們將介紹電路設(shè)計和電路板布局中如何采用“LC”網(wǎng)絡(luò)去耦，以及如何設(shè)計各種應(yīng)用中的電感器。同時，一定要注意電路設(shè)計正確去耦，請記住，無論設(shè)計數(shù)字電路，還是模擬電路，由于速度越來越快，最好一切從模擬而不是數(shù)字開始!</p></span>  <div class="8yeuugi" 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" coords="133,235,319,253" target="_blank" /> <area shape="rect" 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