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高頻變壓器的偏磁是什??</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> <strong><a href="http://m.cmqp.com.cn/product/product-0001,0015.shtml">高頻變壓??/a></strong>的偏磁是指磁芯工作磁滯回線中心點偏離零點,正反向脈沖過程中磁工作狀態(tài)不對稱的現(xiàn)??在高頻變壓器耦合的全橋電路中,功率開關(guān)元件的飽和壓降、存儲時間的不同以及其它原因都會造成電壓波形正負(fù)半波不對??即高頻變壓器中正負(fù)伏秒積不平??從而造成偏磁現(xiàn)象.</p>
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<div> 偏磁是指加在變壓器兩端的正反向脈沖電壓的伏秒乘積（伏秒積）不等，從而造成變壓器磁芯的磁滯工作回線偏離坐標(biāo)原點的現(xiàn)象。模擬錄音中使用的高頻信號，能夠改善錄音信號的精度并驅(qū)動抹音磁頭。偏磁信號由偏磁振蕩器發(fā)生。磁性錄音過程的偏磁有交流偏磁和直流偏磁。偏磁可以減少失真，可以提高輸出的穩(wěn)定性，對加大輸出信號的幅度也有影響??/div>
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<div> 在一般情況下隨著高頻變壓器的脈沖寬度增長,初級電流也增??若初級電流增大到一定值時,關(guān)閉當(dāng)前方向的PWM脈沖輸出,則變壓器磁芯磁通和初級電流不再增大.因此,只要檢測出變壓器初級電??并以此來調(diào)整PWM控制器兩路輸出的脈寬??使變壓器初級電流控制在一定范圍內(nèi),就可以消除變壓器磁芯偏磁所帶來的危??電流型PWM控制法可以有效地解決這一問題. </div>
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