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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.
김종령,오영우,안용운,김현식 경남대학교 신소재연구소 2002 신소재연구 Vol.14 No.-
평면 코어와 평면 코일로 이루어진 평면 변압기를 설계 및 제조하여 입출력 신호에 대한 전·자기적 특성을 조사하였다. 자성체의 평면두께가 증가할수록 와전류에 의한 손실이 증가하기 때문에 코일의 저항은 증가하였고, 인던턱스는 두께가 1.4㎜까지 평면두께가 증가할수록 큰 폭으로 증가하였으며 그 이후 2㎜까지는 거의 일정한 값을 나타내었다. 공심과 자심에서 1차 코일과 2차 코일의 교류저항은 주파수 증가에 따라 증가하여 200㎑ 부근의 변곡점을 기존으로 저항의 증가폭이 크게 증가하였다. 1차 코일과 2차 코일의 성능지수는 각각 158, 75로 높은 값을 나타내었고, 결합인자 k는 0.96∼0.97 범위로 주파수 증가에 따라 비교적 일정한 값을 나타내었다. We designed and fabricated the planer transformer with a planar core and flat coil. Electromagnetic characteristics were investigated for the confirmation of application possibility. The resistance(R_dc) for conductor increase in proportion to the core plane because of eddy current loss, also, the inductance rapidly increases, as the thickness of core plane has increased to 1.4㎜ but there was no substantial change in the range of thickness 1.4㎜ to 2㎜. The resistance(R_ac) for the 1st and 2nd coils increased with frequency and the degree of increase significantly changed at 200㎑. The quality factor for each coils showed quite a high value of 158 and 75 respectively and the coupling factor was unified as frequency has increased at the 0.96∼0.97 range.
나노 결정립 재료를 이용한 비접촉식 커플러의 설계 및 특성
김종령(Jong-Ryung Kim),김현식(Hyun-Sik Kim),허정섭(Jeong-Sub Huh),이해연(Hae-Yeon Lee),이준희(Jun-Hui Lee),오영우(Young-Woo Oh),변우봉(Woo-Bong Byun) 한국자기학회 2006 韓國磁氣學會誌 Vol.16 No.6
The varied heating temperatures were used for magnetic core materials, which nano sized α-Fe crystalline was created in nanocrystalline Fe-Si-B-Nb-Cu materials, with high permeability and low power loss. The highest permeability and lowest power loss were obtained to the specimen heat-treated at 510 ℃. The signal transmission characteristics of inductive coupler, which was manufactured by using the magnetic core materials prepared in this study, at low frequency range, was influenced strongly by magnetic property of magnetic core materials as this result is corresponding to the permeability as a function of heat treatment temperature, as well, it was improved by impedance matching at high frequency range. Over 500 ㎛ of air gap in coupler is required to maintain the magnetic properties without magnetic saturation on the subterranean line transferred high current of 300 A. The inductive coupler for PLC, which has an attenuation characteristics of less than 5 ㏈, was manufactured using nano-crystalline magnetic core materials through the above mentioned research results.
Ni<sub>0.8-x</sub>Zn<sub>0.2</sub>Co<sub>x</sub>Fe<sub>2</sub>O<sub>4+δ</sub>조성 페라이트의 투자율 변화 기구
안용운,김종령,오영우 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.1
The cause for the variation of the initial permeability according to the Co substitution of Ni-Zn ferrite used in the LC resonance filter for the power line communication is studied. The initial permeability decreases as the quantity of Co diminishes, and the saturation magnetization increases as the quantity increases. Because the sintering density and the microstructure of ferrite show little change, the variation of the initial permeability can't be explained by the density, microstructure nor the saturation magnetization factor. The magnetocrystalline anisotropy increases, similar with the saturation magnetization, as the quantity of Co increases. The increase of magnetocrystalline anisotropy value makes the domain wall energy grow, which leads to the decrease of the initial permeability, because there's linear law between the magnetocrystalline anisotropy and the domain wall energy. The resonance frequency to Co substitution moved to high frequency band, due to the close relationship with domain wall energy, Initial permeability decreaed a little with an increase of Co contents, but resonace frequency moved to high frequency band. as a result of that, when Co was added 0.05 mol, initial permeability and resonace frequency was 75 and 25 MHz respectively.
이해연,김현식,김종령,오영우,김은수,Ustinov Evgeniy 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.5
The forward planar transformer, which had power capacity of 300 W, input voltage of 220 V, output voltage of 15 V, and switching frequency of 300 KHz, was designed and manufactured by using the planar core with large effective area and the flat copper leadframes for miniaturization and high efficiency of the switching mode power supply (SMPS). As well as, a forward converter equipped with the above mentioned planar transformer was manufactured and electromagnetic characteristics were investigated. The numerical value of turns for 1st and 2nd winding were 15 and 2 respectively The self inductance of 1st winding was 1.592 mH, very low leakage inductance of 2.7 $\mu$H, and the coupling factor of 0.928 were obtained at switching frequency of 300 KHz. The high efficiency of 88.62 % for the SMPS equipped with planar transformer was obtained at power capacity of 300 W.
Cu 치환에 따른 Ni-Zn 페라이트의 전자파 흡수 특성
오영우,이선학,김종령,안용운,이승관 경남대학교 신소재연구소 2001 신소재연구 Vol.13 No.-
고상반응법을 이용하여 Ni_0.6-xCuZn_0.4Fe _2O_4(x=0, 0.1, 0.2, 0.3) ferrite 분말을 제조하고 1200℃에서 열처리하여 Cu 치환에 따른 입자변화와 전자파흡수 특성과의 관계를 조사하였다. Ni 자리에 Cu를 0.1mol 치환했을 때는 포화자화값은 큰 변화 없이 일정하였고 우수한 전자파습수능을 나타내었고, 그 이상 첨가 시는 포화자화값과 전자파흡수능은 직선적으로 감소하였다. Ni_0.6-xCuZn_0.4Fe _2O_4 ferrite powder was prepared by the solid-reaction method and sintered at 1200℃ and investigated grain size related with electromagnetic wave absorbing properties were investigated as a function of Cu substitution. The saturation magnetization and electromagnetic wave absorbing efficiency were rarely changed until substitution of Cu 0.1mol into Ni-site, but decreased strongly over 0.1mol Cu,