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高頻變壓器設(shè)計(jì)之如何提高效率</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
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<p><span style="font-family: Arial;"><span style="font-size: 14px;"> 大家在設(shè)??a href="http://cmqp.com.cn/product/product-0001,0015.shtml">高頻變壓??/a>的時(shí)候肯定會(huì)有多多少少的問(wèn)題，接上幾篇文章所說(shuō)，它的設(shè)計(jì)是有很多方面需要注意的，今天就??a href="http://cmqp.com.cn">深圳晨飛電子</a>的小編來(lái)為您講解它設(shè)計(jì)時(shí)的另外一個(gè)要求：如何提高效率??/span></span></p>
<p><span style="font-family: Arial;"><span style="font-size: 14px;"> 提高效率是對(duì)電源和電子設(shè)備的普遍要求.雖然從單??a href="http://cmqp.com.cn/product/product-0001,0015.shtml">高頻變壓??/a>來(lái)看,損耗不??例如,100VA高頻變壓家具家電效率??8%??損耗只??W,并不??但是成十萬(wàn)個(gè),成百萬(wàn)個(gè)高頻變壓??總損耗可能達(dá)到上100kW,甚至上MW.高頻電源變壓器一直長(zhǎng)期運(yùn)??年總損耗相當(dāng)可??有可能達(dá)到上10GW·h.這樣,提高高頻電變壓器效率,可以節(jié)約電力.節(jié)約電力??可以少建發(fā)電??少建發(fā)電站后,可以少消耗煤和石??可以少排放CO2,SO2,NOx,廢氣,廢水,減少對(duì)環(huán)境的污染.既具有節(jié)約能??又具有環(huán)境保護(hù)的雙重社會(huì)經(jīng)濟(jì)效益.因此,提高效率是高頻電源變壓器最重要的設(shè)計(jì)要??一般效率要提高??5%以上,損耗要減少??%以下.高頻電源變壓器損耗包括磁芯損??鐵損)和繞組（銅損??有人關(guān)心變壓器的鐵損和銅損的比例.這個(gè)比例是隨變壓器的工作頻率發(fā)生變化??如果變壓器的外加電壓越低,繞組匝數(shù)越多,銅損越大.因此??0Hz工頻??銅損遠(yuǎn)遠(yuǎn)超過(guò)鐵損.例如:50Hz,100kVAS9型三相油浸式硅片變壓??銅損為鐵損的5倍左??50Hz,100kVASH11型三相油浸式非晶合金電力變壓??銅損為鐵損的20倍左??<br />
鐵損是高頻電源變壓器損耗的主要部分. 正因?yàn)殍F損是高頻電源變壓器損耗的主要部分,因此根據(jù)鐵損選擇磁芯材料是高頻電源變壓器設(shè)計(jì)的一個(gè)主要內(nèi)容??br />
成為評(píng)價(jià)軟磁芯材料的一個(gè)主要參??鐵損與磁芯的工作磁通密度工作頻率有??在介紹軟磁磁芯材料鐵損時(shí),必須說(shuō)明工作磁通密度下和在什么工作頻率下?lián)p??用符號(hào)表示時(shí),也必須標(biāo)明PB/f。鐵損還與工作溫度有??在介紹軟磁磁芯材料鐵損時(shí),必須指明它的工作溫度,特別是軟磁鐵氧體材料,對(duì)溫度變化比較敏??在產(chǎn)品說(shuō)明書(shū)中都要列??5℃至100℃的鐵損. </span></span></p>
<p><span style="font-family: Arial;"><span style="font-size: 14px;"> 軟磁材料的飽和磁通密度并不完全代表使用的工作磁通密度的上限,常常是鐵損限制了工作磁通密度的上限.所以高頻電源變壓器用軟磁鐵氧體材料分類(lèi)標(biāo)準(zhǔn)??把允許的工作磁通密度和工作頻率乘積B×f,作為材料的性能因子,并說(shuō)明子條件下允許的損耗??新的分類(lèi)標(biāo)準(zhǔn)根據(jù)性能因子把軟磁鐵氧體材料分為PW1,PW2,PW3,PW4,PW5????性能因子工作頻率越高,極限頻率也越??例如,PW3類(lèi)軟磁鐵氧體材料,工作頻率??00kHz,極限頻率??00kHz,性能因子B10000mT×kHz??</span></span></p>
<p><span style="font-family: Arial;"><span style="font-size: 14px;"> 在某一段工作頻率下,高頻電源變壓器的繞組損??銅損)與鐵損相接近??例如,銅損/鐵損=100%??5%范圍量，也不能忽??也應(yīng)當(dāng)考慮采取措施來(lái)減少銅??由于原繞組和副繞組承擔(dān)的功率相近,往往在設(shè)計(jì)中取原繞組的銅損來(lái)減少銅損,以便簡(jiǎn)化設(shè)計(jì)計(jì)算過(guò)??不能只強(qiáng)調(diào)依靠溫升來(lái)設(shè)計(jì)高頻電源變壓??由于熱阻不容易準(zhǔn)確確??因此,為了簡(jiǎn)化計(jì)??有時(shí)根據(jù)經(jīng)驗(yàn)預(yù)先推薦一些原則和數(shù)據(jù)是必要的.同樣,為了簡(jiǎn)化計(jì)??對(duì)不同工作頻率的高頻電源變壓器推薦不同的繞組電流密度,也是必要??但不限于某一個(gè)電流密度??例如,2A/mm2??A/mm2.現(xiàn)高頻電源變壓器設(shè)計(jì)要求的方法并不限于一??應(yīng)當(dāng)允許進(jìn)行多種多樣的探??"你走你的陽(yáng)關(guān)??我走我的獨(dú)木橋??/span></span></p>
<p><span style="font-size: 14px;"><span style="font-family: Arial;"> </span></span><span style="font-family: Arial;">小編提醒您，在設(shè)計(jì)高頻電源變壓器的時(shí)候，一定要從多方面資料進(jìn)行參考，這樣它設(shè)計(jì)得最有價(jià)值。本篇文章由深圳晨飛電子技術(shù)團(tuán)隊(duì)提供，轉(zhuǎn)載請(qǐng)注明。網(wǎng)址：http://cmqp.com.cn??/span><span style="font-family: Arial;"> <br />
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