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呵呵,才过两天竟已如此热闹。
读Mr.Doug Blackburn在soundstage发表过的分析环形与EI变压器的老文,看到直流分量与变压器噪声的段落,正好可供关心本贴内容的网友参考,权作免费脱盲资料。
全文太长不贴了给个链接http://www.soundstage.com/maxdb/maxdb071998.htm,相关文字在文中Two transformer types versus DC offset段落下第一小节。
原文:What does DC Offset have to do with the AC Power Transformer? Everything! You see, the toroid transformer is very intolerant of DC offset being present at the input (primary winding). In fact, if there is any DC at all in the AC power supplied to the typical AC Power toroid transformer, the laminated metal core of the transformer "saturates" and the transformer no longer operates as designed. The result is often high levels of audible noise from the transformer as well as very high levels of noise getting into the power supply of the component.
中文大意:
直流偏置对交流电源变压器做了些什么?你看到的一切就是环形变压器是完全不能容忍出现在输入端(初级绕组)的直流偏置。事实上,如果交流电源上有任何一点直流加给典型的环形电源变压器,变压器的铁芯就“饱和”并且变压器不再按原设计运行。其结果往往发出很响的噪声并且有很大的噪声进入设备的电源。
此文对环形与EI变压器的对比较写得比较客观也比较详细,对变压器有研究的朋友西文好的推荐一读。
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