6COLONEL W T. Transformer and inductor design handbook[M]. New York: Marcel Dekker, 1988.
7BOSSCHE A V, VALCHEV V,FILCHEV T.Improved approximation for fringing permeances in gapped inductors[J]. Conference Record of the 2002 IEEE Industry Applications Conference, 2002(2) : 932-938.
8COLONEL W T. Transformer and inductor design handbook[M]. New York : Marcel Dekker, 2004.