Atsushi Yoshida, Chiaki Kuji, T. Hasebe, Masashi Ozawa
{"title":"A Novel Aluminum Electrolytic Capacitor Suitable for High-frequency Power Converters","authors":"Atsushi Yoshida, Chiaki Kuji, T. Hasebe, Masashi Ozawa","doi":"10.4139/SFJ.69.571","DOIUrl":"https://doi.org/10.4139/SFJ.69.571","url":null,"abstract":"Aluminum electrolytic capacitors have high capacitance and high volumetric efficiency. Electrolytic capacitors with high rated voltage (> 300 V), however, show large reduction of capacitance in high frequency regions, which is attributable to the long tunnel pit structure of anode foils. To demonstrate the effect of the structure, equivalent circuit simulations focusing on voltage transient phenomena concerning the tunnel pit length were performed. In addition, effective capacitance measurements under current pulse operation were carried out with prototype capacitors with different tunnel length. The test results demonstrated the feasibility of a new concept electrolytic capacitor for high frequency applications. The new concept can provide an advantage in helping in downsizing and increment of ripple current capability at high frequency. The performance of the proposed capacitors utilizing an anode foil with appropriate structure was evaluated. As a result of the high frequency ripple current operation tests, it was found that approximately 30% increase in ripple current capability at high frequency when the capacitor size is held constant, and approximately 25% reduction in capacitor volume when high-frequency capacitance and ripple current capability are held constant can be achieved.","PeriodicalId":109442,"journal":{"name":"2018 20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114205350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Investigation of Turn-on and Turn-off Characteristics of Enhancement-Mode GaN Power Transistors","authors":"F. Karakaya, M. Ugur, O. Keysan","doi":"10.5072/ZENODO.45670","DOIUrl":"https://doi.org/10.5072/ZENODO.45670","url":null,"abstract":"In this paper, turn-on and turn-off switching behavior of 650V enhancement-mode GaN power FETs are investigated. An analytical model is developed to analyze the current-voltage characteristics of the device during switching transients both with and without the effects of parasitic components. In addition, the effect of the temperature and circuit parameters on the switching characteristics are investigated.","PeriodicalId":109442,"journal":{"name":"2018 20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125018886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Bidirectional isolated DC/DC converter using NPC inverters suitable for high power application","authors":"Taishi Kitamura, S. Takagi, Y. Kawabata","doi":"10.5416/JIPE.42.58","DOIUrl":"https://doi.org/10.5416/JIPE.42.58","url":null,"abstract":"We have already proposed a new control method of the bidirectional isolated dc/dc converter with a current resonant circuit which can perform zero-current switching and the power factor improvement by means of pulse width control. This method is that pulse width of the inverter of higher d.c. voltage is narrowed to make equal fundamental a.c. voltage of both inverters. However, in this current resonant circuit, because the reactor becomes large and the resistance increases, there is a problem that improvement of efficiency is not so high. In this paper, to solve these problems, a new bidirectional isolated dc/dc converter using the NPC 3-level inverter will be proposed.","PeriodicalId":109442,"journal":{"name":"2018 20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129024047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Design for Reliability in Power Electronic Systems","authors":"F. Blaabjerg","doi":"10.1016/b978-0-12-811407-0.00051-9","DOIUrl":"https://doi.org/10.1016/b978-0-12-811407-0.00051-9","url":null,"abstract":"","PeriodicalId":109442,"journal":{"name":"2018 20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe)","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133311104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}