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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.
안용운(Yong-Woon An),김종령(Jong-Ryung Kim),오영우(Young-Woo Oh) 한국자기학회 2003 韓國磁氣學會誌 Vol.13 No.6
The electromagnetic properties of Ni_(0.8)Zn_(0.2)Fe₂O₄ having stable characteristics in high frequency range were investigated as functions of Bi₂O₃, CaO contents. Power loss increased in proportion to the amount of Bi₂O₃ up to 0.3 wt% and decreased over 0.3 wt%. Also, permeability increased with Bi₂O₃ contents. The lowest power loss and highest resonance frequency were obtained to the specimens added Bi₂O₃ of 0.7wt% and CaO of 0.3 wt% due to creation of resistivity layers in the grain boundaries originated by the solid solution of Bi₂O₃ and CaO.
김현식(Hyun-Sik Kim),이해연(Hae-Yeon Lee),김종령(Jong-Ryung Kim),오영우(Young-Woo Oh) 한국자기학회 2002 韓國磁氣學會誌 Vol.12 No.3
We designed the flyback planar transformer, which had 8 W capacity, with 70 V input voltage and 8.2 V output voltage for the establishment of design method and the confirmation of application possibility. The numerical value of inductance measured under the switching frequency of 120 ㎑ was 1650 μH, which was the inductance efficiency of 85~87% against theoretical value. The A.C. resistance of primary and secondary coil was 4.2 Ω and 0.25 Ω respectively, On the other hand, the quality factor for each wound numbers showed quite a high value of 158 and 75 respectively. And the Coupling Factor was 0.96~0.97 under 120 ㎑ switching frequency. The inductance rapidly increased as the thickness of the core plane increased until it became 1.4 ㎜ but under the thickness more than 1.4 ㎜, there was no substantial change. Therefore, the critical value of the plane thickness of core was 1.4 ㎜. And the shape of the output wave of the planar transformer at 70V input voltage was a stable square wave.
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.
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,