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高頻變壓器磁芯材料的選擇和工作點(diǎn)的確??/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)表時間??013-07-18 11:16:00</span>
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<p> <strong>高頻變壓??/strong>在現(xiàn)今的電力系統(tǒng)中具有非常重要的意義,在它的設(shè)計(jì)制作中,磁芯的選擇是非常重要的一??它的好壞對變壓器的工作會產(chǎn)生重大影響,從高頻變壓器的性能指標(biāo)要求可得出，傳統(tǒng)的薄帶硅鋼已很難滿足變壓器在頻率、使用環(huán)境方面的設(shè)計(jì)要求??/p>
<p> 磁芯的材料只有從坡莫合金、鐵氧體材料、鈷基非 晶態(tài)合金和超微晶合金幾種材料中來考慮。坡莫合金、鈷基非晶態(tài)價格高，約為鐵氧體材料的數(shù)倍，而飽和磁感應(yīng)強(qiáng)度Bs也不是很高，且加工工藝復(fù)雜?？紤]到所要求的電源輸出功率并不高，大約為30W.因此，綜合幾種材料的性能比較，在生產(chǎn)上通常都是選擇飽和磁感應(yīng)強(qiáng)度Bs較高，溫度穩(wěn)定性好，價格低廉，加工方便的性價比較低的鋅錳鐵氧體材??</p>
<p> 工作點(diǎn)的確定<br />
<br />
根據(jù)相關(guān)資料，確定高頻變壓器的輸出功率，飽和磁感應(yīng)強(qiáng)度。買來的磁芯，由于廠家提供的磁感應(yīng)強(qiáng)度月，值并不準(zhǔn)確，可用所提供的方式粗略測試一下。將調(diào)壓器接至原線圈，用示波器觀察副線圈輸出電壓波形。將原線圈的輸入電壓由小到大慢慢升高，直到示波器顯示的波形發(fā)生奇變。此時，磁芯已飽和，根據(jù)公式：U=4.44fN1Φ m可推知在工頻時的Φ m值。要求不高時，可根據(jù)測算出的Φ m，粗略估算出原線圈的匝數(shù).</p>
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