0885-8993 (c) 2016 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission. See http://www.ieee.org/publications_standards/publications/rights/index.html for more information. This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication. Citation information: DOI 10.1109/TPEL.2017.2691048, IEEE Transactions on Power Electronics Title : Online Evaluation Method of Electrolytic Capacitor Degradation for Digitally Controlled SMPS Failure Prediction Authors : #Hiroshi Nakao (Corresponding author),, Student Member, IEEE, †Yu Yonezawa, *Takahiko Sugawara 1 , $Yoshiyasu Nakashima =Fujio Kurokawa 2 , Fellow, IEEE Address : #†*+Fujitsu Laboratories LTD. Computer Systems Laboratory. 1-1 Kamikodanaka 4-Choume Nakahara-Ku Kawasaki-Shi Kanagawa-Ken, 211-8588 Japan. #= Nagasaki University. Dept. of Advanced Technology and Science for Sustainable Development. 1-14, Bunkyo-Machi, Nagasaki-Shi, Nagasaki, 852-8521 Japan. Tel. : #†*$ +81-44-754-2931 = +81-95-838-5104 Fax. : #†*$ +81-44-754-2672 Email : # Nakao.h@jp.fujitsu.com †yonezawa.yu@jp.fujitsu.com *sugawarat@jp.fujitsu.com $nakashima.yoshi@jp.fujitsu.com =fkurokaw@nagasaki-u.ac.jp Note : This manuscript is an extended version of a conference paper presented in APEC2016: 2016 the 31st IEEE Annual Applied Power Electronics Conference and Exposition, pp. 754-758, Long Beach, USA, March.23, 2016. 1 Present address TRANSTRON Inc.NMF Shin-Yokohama Building, 2-15-16 Shin-Yokohama, Kouhoku-ku,Yokohama-shi, Kanagawa 222-0033, Japan 2 Present address: Nagasaki Institute of Applied Science, Division of Electrical, Electronics, and Information Technology, 536, Aba-machi, Nagasaki-shi 851- 0193, Japan