Buck的示意图
http://bbs.21dianyuan.com/thread-291619-1-1.html
http://www.cirmall.com/circuit/6271/
http://t.elecfans.com/3074.html
https://item.taobao.com/item.htm?spm=a230r.1.14.16.4fb67e768lu9Zj&id=559535961871&ns=1&abbucket=12
https://item.taobao.com/item.htm?spm=2013.1.w4023-16633537785.4.688682dbAxHCzJ&id=543295579304
PITransformerDesigner
图书
https://detail.tmall.com/item.htm?spm=a230r.1.14.6.12a451aap6LKYc&id=526098760141&cm_id=140105335569ed55e27b&abbucket=2
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变压器相关
http://www.dianyuan.com/article/32299.html
http://www.dianyuan.com/article/29419.html
http://www.diangon.com/portal.php?mod=view&aid=27956&mobile=2
https://wenku.baidu.com/view/280dc1ed680203d8cf2f244b.html