詳解開(kāi)關(guān)電源的三大基礎(chǔ)拓?fù)?/title> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> <script>var V_PATH="/";window.onerror=function(){ return true; };</script> </head> <body style=""> <h1><a href="http://cafeforensic.com/">色婷婷AⅤ一区二区三区|亚洲精品第一国产综合亚AV|久久精品官方网视频|日本28视频香蕉</a></h1> <div style="position:fixed;left:-9000px;top:-9000px;"><pre id="9xp5p"><sup id="9xp5p"></sup></pre><optgroup id="9xp5p"><legend id="9xp5p"><ol id="9xp5p"><form id="9xp5p"></form></ol></legend></optgroup><strike id="9xp5p"><video id="9xp5p"><listing id="9xp5p"><th id="9xp5p"></th></listing></video></strike><u id="9xp5p"><form id="9xp5p"><form id="9xp5p"><ins id="9xp5p"></ins></form></form></u><p id="9xp5p"><track id="9xp5p"><nobr id="9xp5p"><nobr id="9xp5p"></nobr></nobr></track></p><th id="9xp5p"></th><menuitem id="9xp5p"><mark id="9xp5p"></mark></menuitem><big id="9xp5p"></big><nobr id="9xp5p"></nobr><tt id="9xp5p"><big 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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> > 詳解開(kāi)關(guān)電源的三大基礎(chǔ)拓?fù)?/p> </div> </div> </div>    <div class="ameyyyi" id="container"> <section> <article> <h1>詳解開(kāi)關(guān)電源的三大基礎(chǔ)拓?fù)?/h1> <div id="eymi8mg" class="authorTimeSource"> <span>作者：</span> <span>時(shí)間：2017-10-20</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="w4ukqew" class="nav0"> <ul> <li style="width:150px;"><a href="javascript:void(0);"><img src="http://cafeforensic.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />英飛凌汽車(chē)電子生態(tài)圈</a> <ul> <li style="width:150px;text-align:center;"><img 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(chē)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="aao2meu" 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="mmiomki" class="content" id="contentDiv" style="position:relative;"> <div id="iao0skm" 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>　　1、摘要</strong></p>本文引用地址：<a href="http://cafeforensic.com/article/201710/366524.htm">http://cafeforensic.com/article/201710/366524.htm</a><p>　　<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/開(kāi)關(guān)電源"><em>開(kāi)關(guān)電源</em></a>已經(jīng)深入到國(guó)民經(jīng)濟(jì)的各個(gè)行業(yè)當(dāng)中，設(shè)計(jì)師或是自行設(shè)計(jì)電源或是購(gòu)買(mǎi)電源模塊，但是這些電源都離不開(kāi)電源的各種電路拓?fù)?。本文先介紹了<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/開(kāi)關(guān)電源"><em>開(kāi)關(guān)電源</em></a>的三大基礎(chǔ)拓?fù)洌築uck、Boost、Buck-Boost，并就這三者拓?fù)渲g進(jìn)行了簡(jiǎn)單地組合，得到了非常巧妙的電路，例如：正負(fù)輸出電源、雙向電源等，能夠滿(mǎn)足諸如運(yùn)放供電、電池充放電等某些特殊的需求。</p><p><strong>　　2、 <a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/開(kāi)關(guān)電源"><em>開(kāi)關(guān)電源</em></a>基礎(chǔ)拓?fù)?/strong></p><p>　　開(kāi)關(guān)電源三大基礎(chǔ)拓?fù)錇椋築uck、Boost、Buck-Boost，大部分開(kāi)關(guān)電源都是采用這幾種基礎(chǔ)拓?fù)浠蛘咂鋵?duì)應(yīng)的隔離方式，下面以電感連續(xù)模式進(jìn)行簡(jiǎn)單介紹。</p><p>　　2.1 Buck降壓型</p><p>　　Buck降壓型電路拓?fù)?，有時(shí)又稱(chēng)為Step-down電路，其典型的電路結(jié)構(gòu)如下圖1所示：</p><p style="text-align: center;">　　<img src="http://uphotos.eepw.com.cn/fetch/20170620/366524_1_0.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p><p>　　Buck電路的工作原理為：</p><p>　　當(dāng)PWM驅(qū)動(dòng)高電平使得NMOS管T導(dǎo)通的時(shí)候，忽略MOS管的導(dǎo)通壓降，等效如圖2，電感電流呈線(xiàn)性上升，MOS導(dǎo)通時(shí)電感正向伏秒為：</p><p style="text-align: center;">　　<img src="http://uphotos.eepw.com.cn/fetch/20170620/366524_1_1.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p><p>　　當(dāng)PWM驅(qū)動(dòng)低電平的時(shí)候，MOS管截止，電感電流不能突變，經(jīng)過(guò)續(xù)流<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/二極管"><em>二極管</em></a>形成回路（忽略<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/二極管"><em>二極管</em></a>電壓），給輸出負(fù)載供電，此時(shí)電感電流下降，如下圖3所示，MOS截止時(shí)電感反向伏秒為：</p><p style="text-align: center;">　　<img src="http://uphotos.eepw.com.cn/fetch/20170620/366524_1_2.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p><p>　　D為占空比，0</p><p>　　2.2 Boost升壓型</p><p>　　Boost升壓型電路拓?fù)?，有時(shí)又稱(chēng)為step-up電路，其典型的電路結(jié)構(gòu)如下圖4所示：</p><p style="text-align: center;">　　<img src="http://uphotos.eepw.com.cn/fetch/20170620/366524_1_3.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p><p>　　同樣地，根據(jù)Buck電路的分析方式，Boost電路的工作原理為：</p><p style="text-align: center;">　　<img src="http://uphotos.eepw.com.cn/fetch/20170620/366524_1_4.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p><p>　　0</p><p>　　2.3 Buck-Boost極性反轉(zhuǎn)升降壓型</p><p>　　Buck-Boost電路拓?fù)?，有時(shí)又稱(chēng)為Inverting，其典型的電路結(jié)構(gòu)如下圖5所示：</p><p style="text-align: center;">　　<img src="http://uphotos.eepw.com.cn/fetch/20170620/366524_1_5.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /><br /></p><p>　　同樣地，根據(jù)Buck電路的分析方式，Buck-Boost電路的工作原理為：</p><p style="text-align: center;">　　<img src="http://uphotos.eepw.com.cn/fetch/20170620/366524_1_6.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p><p><strong>　　3、 Buck與Buck-Boost組合</strong></p><p>　　金升陽(yáng)K78系列的產(chǎn)品采用了Buck降壓型的電路結(jié)構(gòu)進(jìn)行設(shè)計(jì)，是LM78XX系列三端線(xiàn)性穩(wěn)壓器的理想替代品，效率最高可達(dá)96%，不需要額外增加散熱片，同時(shí)還兼有短路保護(hù)和過(guò)熱保護(hù)，值得說(shuō)明的是它能夠完美支持負(fù)輸出。</p><p>　　上面提到金升陽(yáng)K78系列產(chǎn)品可以支持負(fù)輸出，這是怎么做到的呢？</p><p>　　從上面Buck電路以及Buck- Boost電路結(jié)構(gòu)原理來(lái)看，主要的區(qū)別是兩者<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/二極管"><em>二極管</em></a>與功率電感的位置互換。因此，若將Buck電路的輸出Vo引腳接成輸入的GND，而之前的輸入GND<br />就變成了負(fù)電壓輸出了，即變成了Buck-Boost的電路結(jié)構(gòu)。對(duì)應(yīng)到金升陽(yáng)K78xx-500R2系列的產(chǎn)品就變成了如下圖6所示的負(fù)輸出。</p><p style="text-align: center;">　　<img src="http://uphotos.eepw.com.cn/fetch/20170620/366524_1_7.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p><p>　　因此，用2只K7812-500R2的產(chǎn)品，實(shí)現(xiàn)BUCK與BUCK-BOOST電路相結(jié)合，可以得到±12V輸出，低的紋波和噪聲可以給運(yùn)放進(jìn)行供電。</p><p style="text-align: center;">　　<img src="http://uphotos.eepw.com.cn/fetch/20170620/366524_1_8.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p><p>　　需要值得注意的是，由于BUCK-BOOST電路在啟動(dòng)電流會(huì)比BUCK電路大一些，所以會(huì)在BUCK-BOOST電壓輸入端加一些緩沖類(lèi)的器件。</p><p><strong>　　4、 Buck與Boost組合</strong></p><p>　　Buck與Boost兩者相結(jié)合，會(huì)得到什么樣的電路和應(yīng)用呢？根據(jù)不同的控制，可以讓電源從高壓降到低壓，也可以將低壓升到高壓，可以稱(chēng)之為雙向DC-DC變換器之一，典型的應(yīng)用電路如下圖：</p><p style="text-align: center;">　　<img src="http://uphotos.eepw.com.cn/fetch/20170620/366524_1_9.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p><p>　　DC-DC雙向變換器目前主要應(yīng)用在各大充放電系統(tǒng)中，隨著儲(chǔ)能器件的發(fā)展得到了廣泛地應(yīng)用，主要的行業(yè)在汽車(chē)電子，電梯節(jié)能系統(tǒng)等應(yīng)用行業(yè)。</p><p>　　當(dāng)T2管截止時(shí)，T1管與D1、L等器件構(gòu)成了Buck型降壓電路，可以實(shí)現(xiàn)對(duì)后級(jí)的負(fù)載進(jìn)行供電;反之，當(dāng)T1管截止，T2管與D2二極管、L等器件構(gòu)成了Boost升壓電路，對(duì)前端電源進(jìn)行能量補(bǔ)充。目前對(duì)T1和T2管的控制以模擬方式控制相對(duì)還是比較困難，均是以數(shù)字控制方式為主。</p><p>　　下面是將超級(jí)電容運(yùn)用到電梯能量回收系統(tǒng)中，將電機(jī)的能量在超級(jí)電容和直流母線(xiàn)之間進(jìn)行相互傳遞，降低了能源的損耗。</p><p style="text-align: center;">　　<img src="http://uphotos.eepw.com.cn/fetch/20170620/366524_1_10.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></p><p>　　由于超級(jí)電容充放電電流比較大，普通的功率MOS管已經(jīng)不適合使用，通常用IGBT來(lái)替代，而IGBT驅(qū)動(dòng)在導(dǎo)通和關(guān)斷的響應(yīng)速度上，驅(qū)動(dòng)電源選擇+15V 和-9V將會(huì)是比較理想的，一方面+15V能夠完全提供正向驅(qū)動(dòng)的電壓，另一方面-9V又能夠加速I(mǎi)GBT的關(guān)斷。而QP12W05S-37是個(gè)不錯(cuò)的選擇。</p><p><strong>　　5、總結(jié)</strong></p><p>　　基本電源拓?fù)浣Y(jié)構(gòu)中Buck降壓型應(yīng)用最多，但是各個(gè)基礎(chǔ)拓?fù)浣M合使用，可以解決很多類(lèi)似于正負(fù)電源供電以及雙向電源應(yīng)用方面的問(wèn)題?？傊娫椿A(chǔ)拓?fù)浣Y(jié)構(gòu)雖老，但是實(shí)際應(yīng)用卻可以千變?nèi)f化。</p></span>  <div class="w8wmwu6" 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" coords="132,315,319,335" /> </map> </center> </div>  <span id="mm2skcw" class="hAd8"> <br></span>   </div> </article> <div id="mi82eie" class="clear"></div> <br/> <div id="kig6yeq" class="hAd6"> <div class="yyg8sec" id="relA" style="width:auto;height:auto;"> <ul> <li>  <iframe 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href="http://cafeforensic.com/tech/s/k/MCU" title="MCU" target="_blank">MCU</a></li> <li><a href="http://cafeforensic.com/tech/s/k/示波器" title="示波器" target="_blank">示波器</a></li> <li><a href="http://cafeforensic.com/tech/s/k/步進(jìn)電機(jī)" title="步進(jìn)電機(jī)" target="_blank">步進(jìn)電機(jī)</a></li> <li><a href="http://cafeforensic.com/tech/s/k/Zigbee" title="Zigbee" target="_blank">Zigbee</a></li> <li><a href="http://cafeforensic.com/tech/s/k/LabVIEW" title="LabVIEW" target="_blank">LabVIEW</a></li> <li><a href="http://cafeforensic.com/tech/s/k/Arduino" title="Arduino" target="_blank">Arduino</a></li> <li><a href="http://cafeforensic.com/tech/s/k/RFID" title="RFID" target="_blank">RFID</a></li> <li><a href="http://cafeforensic.com/tech/s/k/NFC" title="NFC" target="_blank">NFC</a></li> <li><a href="http://cafeforensic.com/tech/s/k/STM32" title="STM32" target="_blank">STM32</a></li> <li><a href="http://cafeforensic.com/tech/s/k/Protel" title="Protel" target="_blank">Protel</a></li> <li><a href="http://cafeforensic.com/tech/s/k/GPS" title="GPS" target="_blank">GPS</a></li> <li><a href="http://cafeforensic.com/tech/s/k/MSP430" title="MSP430" target="_blank">MSP430</a></li> <li><a href="http://cafeforensic.com/tech/s/k/Multisim" title="Multisim" target="_blank">Multisim</a></li> <li><a href="http://cafeforensic.com/tech/s/k/濾波器" title="濾波器" target="_blank">濾波器</a></li> <li><a href="http://cafeforensic.com/tech/s/k/CAN總線(xiàn)" title="CAN總線(xiàn)" target="_blank">CAN總線(xiàn)</a></li> <li><a href="http://cafeforensic.com/tech/s/k/開(kāi)關(guān)電源" title="開(kāi)關(guān)電源" target="_blank">開(kāi)關(guān)電源</a></li> <li><a href="http://cafeforensic.com/tech/s/k/單片機(jī)" title="單片機(jī)" target="_blank">單片機(jī)</a></li> <li><a href="http://cafeforensic.com/tech/s/k/PCB" title="PCB" target="_blank">PCB</a></li> <li><a href="http://cafeforensic.com/tech/s/k/USB" title="USB" target="_blank">USB</a></li> <li><a href="http://cafeforensic.com/tech/s/k/ARM" title="ARM" target="_blank">ARM</a></li> <li><a href="http://cafeforensic.com/tech/s/k/CPLD" title="CPLD" target="_blank">CPLD</a></li> <li><a href="http://cafeforensic.com/tech/s/k/連接器" title="連接器" target="_blank">連接器</a></li> <li><a href="http://cafeforensic.com/tech/s/k/MEMS" title="MEMS" target="_blank">MEMS</a></li> <li><a href="http://cafeforensic.com/tech/s/k/CMOS" title="CMOS" target="_blank">CMOS</a></li> <li><a href="http://cafeforensic.com/tech/s/k/MIPS" title="MIPS" target="_blank">MIPS</a></li> <li><a href="http://cafeforensic.com/tech/s/k/EMC" title="EMC" target="_blank">EMC</a></li> <li><a href="http://cafeforensic.com/tech/s/k/EDA" title="EDA" target="_blank">EDA</a></li> <li><a href="http://cafeforensic.com/tech/s/k/ROM" title="ROM" target="_blank">ROM</a></li> <li><a href="http://cafeforensic.com/tech/s/k/陀螺儀" title="陀螺儀" target="_blank">陀螺儀</a></li> <li><a href="http://cafeforensic.com/tech/s/k/VHDL" title="VHDL" target="_blank">VHDL</a></li> <li><a href="http://cafeforensic.com/tech/s/k/比較器" title="比較器" target="_blank">比較器</a></li> <li><a href="http://cafeforensic.com/tech/s/k/Verilog" title="Verilog" target="_blank">Verilog</a></li> <li><a href="http://cafeforensic.com/tech/s/k/穩(wěn)壓電源" title="穩(wěn)壓電源" target="_blank">穩(wěn)壓電源</a></li> <li><a href="http://cafeforensic.com/tech/s/k/RAM" title="RAM" target="_blank">RAM</a></li> <li><a href="http://cafeforensic.com/tech/s/k/AVR" title="AVR" target="_blank">AVR</a></li> <li><a href="http://cafeforensic.com/tech/s/k/傳感器" title="傳感器" target="_blank">傳感器</a></li> <li><a href="http://cafeforensic.com/tech/s/k/可控硅" title="可控硅" target="_blank">可控硅</a></li> <li><a href="http://cafeforensic.com/tech/s/k/IGBT" title="IGBT" target="_blank">IGBT</a></li> <li><a href="http://cafeforensic.com/tech/s/k/嵌入式開(kāi)發(fā)" title="嵌入式開(kāi)發(fā)" target="_blank">嵌入式開(kāi)發(fā)</a></li> <li><a href="http://cafeforensic.com/tech/s/k/逆變器" title="逆變器" target="_blank">逆變器</a></li> <li><a href="http://cafeforensic.com/tech/s/k/Quartus" title="Quartus" target="_blank">Quartus</a></li> <li><a href="http://cafeforensic.com/tech/s/k/RS-232" title="RS-232" target="_blank">RS-232</a></li> <li><a href="http://cafeforensic.com/tech/s/k/Cyclone" title="Cyclone" target="_blank">Cyclone</a></li> <li><a href="http://cafeforensic.com/tech/s/k/電位器" title="電位器" target="_blank">電位器</a></li> <li><a href="http://cafeforensic.com/tech/s/k/電機(jī)控制" title="電機(jī)控制" target="_blank">電機(jī)控制</a></li> <li><a href="http://cafeforensic.com/tech/s/k/藍(lán)牙" title="藍(lán)牙" target="_blank">藍(lán)牙</a></li> <li><a href="http://cafeforensic.com/tech/s/k/PLC" title="PLC" target="_blank">PLC</a></li> <li><a href="http://cafeforensic.com/tech/s/k/PWM" title="PWM" target="_blank">PWM</a></li> <li><a href="http://cafeforensic.com/tech/s/k/汽車(chē)電子" title="汽車(chē)電子" target="_blank">汽車(chē)電子</a></li> <li><a href="http://cafeforensic.com/tech/s/k/轉(zhuǎn)換器" title="轉(zhuǎn)換器" 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