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我們來分析一下高頻變壓器的電路設(shè)??/h3>
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<span>文章出處??a href=""><a >深圳市晨飛電子有限公??/a></a></span><span>網(wǎng)責(zé)任編輯：<a >NSW</a></span><span>作者：<a >NSW</a></span><span>人氣??span
id="cntrHits">-</span></span><span>發(fā)表時(shí)間??014-02-11 14:52:00</span>
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<p>壓電陶瓷<strong><a href="http://linhang.com.cn/">高頻變壓??/a></strong>開關(guān)電源的電路設(shè)計(jì)：在選用傳統(tǒng)電磁變壓器的開關(guān)電源電路設(shè)計(jì)中，通常是根據(jù)它傳輸?shù)墓β?、電源輸入特點(diǎn)、輸出特點(diǎn)，是否要求輸入輸出隔離等等要求來選擇工作電路的拓?fù)浣Y(jié)構(gòu)，再根據(jù)選用的電路結(jié)構(gòu)，輸出功率等要求設(shè)計(jì)電磁變壓器，確定磁芯、繞組組數(shù)、線圈線徑和匝數(shù)等各項(xiàng)參數(shù)。因此在設(shè)計(jì)電路參數(shù)時(shí)，基本沒把電磁變壓器參數(shù)考慮進(jìn)去，只是在電源電路確定后才考慮變壓器設(shè)計(jì)。壓電變壓器電源的電路設(shè)計(jì)需要把壓電陶瓷變壓器作為影響電路是否正常工作的一個(gè)重要因素，即在電路結(jié)構(gòu)選擇，電路參數(shù)確定，控制方式等方面，都需要考慮壓電陶瓷變壓器的作用。壓電陶瓷高頻變壓器的激勵(lì)信號(hào)頻率和負(fù)載對(duì)壓電陶瓷變壓器的轉(zhuǎn)換效率影響很大。根據(jù)壓電變壓器的等效電路，當(dāng)壓電變壓器處于諧振狀態(tài)時(shí)，從輸入端看進(jìn)去，相當(dāng)于一個(gè)容性負(fù)載。因此需要一個(gè)輸入匹配電路來減小流入壓電陶瓷變壓器的電流，或者說來補(bǔ)償容性阻抗。輸入匹配電路的設(shè)計(jì)主要由壓電陶瓷變壓器的輸入阻抗和開關(guān)變換電路的輸出阻抗決定?；趬弘娞沾勺儔浩鏖_關(guān)電源的主電路結(jié)構(gòu)與傳統(tǒng)電磁開關(guān)電源的主電路結(jié)構(gòu)一樣，仍然有回掃逆變電路、推挽逆變電路、全橋逆變電路，半橋逆變電路幾種拓?fù)浣Y(jié)構(gòu)。推挽逆變電路需要大電感來完成充電和放電，對(duì)采用壓陶瓷變壓器使小型化電源的優(yōu)勢(shì)不再存在??/p>
<p> 全橋逆變電路使用開關(guān)元件多，而對(duì)于壓電陶瓷變壓器半橋逆變電路，其主電路結(jié)構(gòu)有幾種方式。借助壓電陶瓷變壓器才能完成零電壓開??每個(gè)開關(guān)周期，諧振能量會(huì)在諧振環(huán)中流動(dòng)，最終回送到輸入當(dāng)中去。這些送回去的能量越多，半導(dǎo)體開關(guān)器件承受的應(yīng)力就越大，在電路中損失的能量也越多;串聯(lián)電感，與變壓器的靜態(tài)電容一起，可以保證壓電變壓器工作在較好的狀態(tài)，但在設(shè)計(jì)上存在一定限制。在實(shí)際應(yīng)用過程中，壓電陶瓷變壓器的溫度會(huì)發(fā)生變化，且所帶的負(fù)載也隨時(shí)在變化，這兩個(gè)因素會(huì)引起壓電陶瓷變壓器的諧振頻率發(fā)生變化。如果電源電路輸出固定頻率的激勵(lì)信號(hào)，不能跟蹤壓電陶瓷變壓器的諧振頻率，那么壓電陶瓷變壓器諧振頻率變化時(shí)，其轉(zhuǎn)換效率因不能工作在諧振狀態(tài)下大大降低，甚至不工作。因此要求主電路的輸出頻率能跟蹤壓電陶瓷變壓器的諧振頻率。在實(shí)際的應(yīng)用過程當(dāng)中中，如果說電壓調(diào)節(jié)范圍比較大，雖然可通過PFM調(diào)節(jié)方法實(shí)現(xiàn)，但這種方法不僅調(diào)節(jié)范圍窄，而且影響壓電冉瓷變壓器的最佳的工作狀態(tài)。因此在要求調(diào)節(jié)范圍大的應(yīng)用場(chǎng)合可通過PWM與PFM來共同完成??/p>
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