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평면변압기적용 Forward DC/DC Converter
최선호(S.H.Choi),박진영(J.Y.Park),박성수(S.S.Park),김은수(E.S.Kim),이해연(H.Y.Lee),김현식(H.S.Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.11
In this paper, the design and implementation of a high power(300W) forward converter using a<br/> planar transformer is presented. The overall size and volume of the converter is decreased by replacing a planar transformer in stead of using a conventional winding transformer. Due to the decreased size and volume, power density of the applied forward converter IS increased. Also, in this paper, the 300W ZVS forward converter with active clamp snubber circuit is compared<br/> to the 300W hard switching forward converter.
김종령,김현식,이해연,오영우,Kim, J.R.,Kim, H.S.,Lee, H.Y.,Oh, Y.W. 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.12
The rosen types of piezo-transformers were prepared and electrical properties were investigated in order to establish the optimum parameters in the process of polarization for ferroelectric materials. Polarization was readily originated with increasing the external energy such as an applied voltage, time, and temperature so that the planar coupling factor and voltage gain were saturated under the conditions of over 14$0^{\circ}C$, applied voltage and time of 4 kV/mm and 3 minutes respectively. The empirical equation for domain rotation probability, which was in proportion to square of an applied voltage and temperature and square root of time, as functions of the above parameters was defined.