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反激式高頻變壓器的設計及注意事項</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>網責任編輯：<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??013-08-20 10:43:00</span>
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<p> 在反激式電源變換器設計的關鍵因素之一??strong>高頻變壓??/strong>的設計。這里的高頻變壓器不是真正意義上的變壓器，而更多的是一個能量存儲裝置。在變壓器初級導通期間能量存儲在磁芯的氣隙中，關斷期間存儲的能量被傳送給輸出。初次級的電流不是同時流動的。因此它更多的被認為是一個帶有次級繞組的電感??br />
<br />
反激式高頻鏈逆變器又稱電流型高頻鏈逆變器，它是以反激變換器拓撲為基礎演變而來的，其電路拓撲是由高頻逆變器、高頻變壓器和周波變換器組成，其中高頻變壓器不僅提供電氣隔離和電壓調整而且還可以存儲能量，因此可以省掉輸出濾波電感。相比于其它結構的高頻鏈逆變器，反激變換器的電流源高頻鏈逆變器具有拓撲結構簡單、能量雙向流動、控制易于實現、無電壓過沖問題等優(yōu)點??/p>
<p> 針對反激式高頻鏈逆變器的高頻變壓器設計需要注意以??點：</p>
<p> 1.反激型電路工作于電流斷續(xù)模式時，變壓器的磁芯利用率較高，故在設計反激型變壓器時，應根據DCM模式下的公式去計算原副邊電壓比；</p>
<p> 2.在設計反激型電路的變壓器時，必須設計足夠的磁芯氣隙來防止磁芯飽和狀態(tài)并平衡直流成分</p>
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