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김기용(Kim Kiyoung),윤대영(Youn Daeyoung),김창선(Kim Changsun) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
The multi-resonant converter minimizes the parasitic oscillations using the resonant tank circuit absorbed parasitic reactances in a converter. So the converter can be operated at a high frequency and it provides a high efficiency because the switching power losses are reduced effectively. However, the high resonant voltage stress of semiconductors leads to the conduction loss. In this paper, it is proposed the novel fly back multi-resonant converter. The converter input is divided by two series input capacitors. And also the resonant stress is reduced to 2-3 times input voltage without any complexity and it provides the various circuit schemes in lots of applications. The proposed converters are verified through simulation and experiment.
정진은(Jineun Chung ),전세훈(Sehun Jeon ),이상운(Sangwoon Lee ),정재우(Jaewoo Chung ),김기용(Kiyoung Kim) 한국자동차공학회 2017 한국자동차공학회 지부 학술대회 논문집 Vol.2017 No.6
Turbocharging is widely in engine of passenger vehicles as an effective method to reduce fuel consumption and realize the engine down-sizing. However, turbochargers have turbo-lag due to mechanical friction losses. In this study, we focus on the bearing friction losses which are a major cause of mechanical friction losses and particularly intensified in the lower speed range of the engine. We measured the friction losses of the full-floating turbocharger while considering the influence of the rotation speed of turbocharger, oil temperature and pressure. The friction losses were measured with the turbocharger friction loss measuring device that had been made using a drive motor, load cell, magnetic coupling and oil control device in the previous study. The result showed that a faster turbocharger rotation speed and a lower oil inlet temperature resulted in increased in increased the values of friction losses on the measuring point.