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<p>電壓雙象限Buck-Boost電路拓?fù)浼胺治?/p><strong>摘要：</strong>在傳統(tǒng)全橋電路的基礎(chǔ)上利用單象限電路研究新的電路，達(dá)到拓寬現(xiàn)有電路拓?fù)鋺?yīng)用領(lǐng)域的目的。介紹了電壓雙象限Buck，Boost，Buck/Boost電路以及對(duì)他們的開關(guān)器件關(guān)斷和開通的分析。 <p> <b>關(guān)鍵詞：</b>變換器；拓?fù)�；雙象限；電壓控制</p> <p><b>引言</b></p> <p>在直流變換中不產(chǎn)生電能形式變化，只產(chǎn)生直流電參數(shù)的變化。DC/DC變換器具有成本低、重量輕、可靠性高、結(jié)構(gòu)簡(jiǎn)單等特點(diǎn)，因此，在工業(yè)領(lǐng)域和實(shí)驗(yàn)室得到了廣泛應(yīng)用。單象限直流電壓變換器電路的特點(diǎn)是輸出電壓平均值Uo跟隨占空比D值而變，但不管D為何值，Uo的極性則始終不變，這對(duì)于直流開關(guān)穩(wěn)壓電源一類的應(yīng)用場(chǎng)所是能夠滿足要求的。但對(duì)于直流調(diào)速電源，負(fù)載為直流電動(dòng)機(jī)時(shí)，上述性能便不能滿足要求，因而發(fā)展了多象限直流電壓變換電路。</p> <p> 雙象限電路分為輸出電流平均值Io極性可變的電路與輸出電壓平均值Uo極性可變的電路兩類，通常前一種電路稱為電流雙象限電路，后一種電路稱為電壓雙象限電路。電流雙象限電路是指輸出電流平均值Io的幅值和極性均隨控制信號(hào)us而變化，但輸出電壓平均值Uo的極性卻始終為正，即電路可運(yùn)行于第一和第二象限。電壓雙象限電路是指輸出電壓平均值Uo的幅值和極性均隨控制信號(hào)us而變化，但輸出電流平均值Io卻始終為正，即電路可運(yùn)行于第一和第四象限。本文將對(duì)電壓雙象限Buck?Boost電路進(jìn)行分析。</p> <p><b>1 Buck電路</b></p> <p>1.1 電路結(jié)構(gòu)</p> <p>主電路如圖1所示。用電感、內(nèi)阻和等效電壓串聯(lián)電路表示有源負(fù)載，橋的直流輸入端并聯(lián)濾波電容。這是一個(gè)全橋電路結(jié)構(gòu)，橋的每臂用全控型器件（S1，S2）和不控型器件（D1，D2）組成。S1及S2的控制采用PWM控制，這樣可以調(diào)節(jié)D值，并且及時(shí)檢測(cè)負(fù)載的運(yùn)行狀況，由此控制開關(guān)的關(guān)斷和開通。此電路的元器件、電源、負(fù)載均假設(shè)為理想的。輸出濾波電感足夠大，可保證負(fù)載電流連續(xù)，且線性升降。</p> <p> 1.2 工作原理</p> <p>1.2.1 運(yùn)行于第一象限</p> <p>這是指輸出端電壓平均值和電流平均值均為正的工作狀態(tài)。</p> <p> （0≤t≤DT） S1及S2均導(dǎo)通，等效電路如</p> <p> 圖2(a)所示，輸出電壓Uo為Ud，輸入電流等于輸出電流，輸出電流線性增長(zhǎng)，負(fù)載從電源吸取能量。</p> <p>(DT≤t≤T) S1導(dǎo)通，S2斷開，D1正偏續(xù)流，等效電路如圖2(b)所示，由于S1與D1導(dǎo)通，Uo的值為零。</p> <p>輸出電壓平均值為 Uo=DUd</p> <p>1.2.2 運(yùn)行于第</p> <p><b>[1] [2] [3] </b></p><script>s("content_relate");</script><p>【電壓雙象限Buck-Boost電路拓?fù)浼胺治觥肯嚓P(guān)文章：</p><p><a target="_blank" href="http://m.msguai.com/zuixinxiaoxi/ziliao/20170722000008_1401651.html" title="象限分析法">象限分析法</a><span>05-01</span></p><p><a target="_blank" href="http://m.msguai.com/zuixinxiaoxi/ziliao/20170710000008_1388138.html" 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