http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김병걸(Byung-Geol Kim),송재성(Jae-Sung Song),김현식(Hyun-Sik Kim),오영우(Young-Woo Oh) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.1
The magnetic properties of an Fe_(87)Zr_7B_5Ag₁(at.%) amorphous alloy have been investigated as a function of annealing temperatures to clarify its application potential as a core material for high-frequency use by adding a small amount of insoluble element of Ag. A new excellent soft magnetic material was developed. The amorphous alloy produced by relatively low temperature annealing at Tα=400℃ exhibited very high initial permeability (μi) of 288,000 at 1 ㎑ and 2mOe, very low coercivity (Hc) of 15mOe and low core loss (Wc) of 50 W/㎏ at 100㎑ and 1,000G which is comparable with Co-based amorphous alloys, respectively. It is notable that the values obtained in the present study are the best magnetic properties among various kinds of Fe-based soft amorphous materials reported up to date. The reasons for the achievement of good soft magnetic properties are presumably due to the homogeneous formation of very fine α-Fe clusters with the size of 2-3㎚ in an amorphous matrix, which can be deduced from the increase of resistivity and the TEM observation. The very fine α-Fe clusters embedded in an amorphous matrix had a great influence on reduction of magnetostriction and refinement of magnetic domain.
박막 인덕터와 제조와 DC-DC Converter에의 적용
오영우,민복기,송재성 경남대학교 신소재연구소 1999 論文集 Vol.11 No.-
Thin film inductors of 10 mm×10 mm with inner coil type of 5 turns were fabricated by sputtering, photo-masking, and etching processes. The inductor has an inductance of 585 nH at 1MHz. And to estimate the applicability of the thin film inductors fabricated in this research to DC-DC converters. the test board of DC-DC converters was made. It was a boost type and input voltage of 2.7 to 5 volts. output voltage of 5 volts, and the switching frequency was 1.6 MHz. When the thin film inductor was adopted, the converter was operated normally. and the maximum efficiency was 49 % at the load of 50.5 Ω and the output power was 0.51 W. This result was not satisfactory for practical usage at present, but the switching FET devices for higher frequency use be developed in the near future, and then more higher frequency switching DC-DC converter will adopt these inductors.
오영우,김현식,송재성 경남대학교 신소재연구소 1997 論文集 Vol.8 No.-
마이크로 자기소자중 가장 간단한 형태인 스파이럴형 박막 공심 인덕터의 제작 및 특성 평가에 관해 연구하였다. 간단한 습식 식각공정으로 두께 12μm, 폭 수십 μm 정도의 코일 패턴을 제작할 수 있었으며, 양호한 미세 패턴을 얻었고, 마이크로 스트립 선로로 제작한 측정 zig로 비교적 정확한 특성을 측정할 수 있었다. 또한, 크기가 10×10mm, 선폭 300μm, 선 간격 70μm, 턴수 12인 스파이럴 코일형 공심 인덕터의 공진 주파수는 300MHz였고, 성능지수는 4 이었다. Recently the development of electronic machine industries have been miniature of size as well as increasement of driving frequency in electronic parts. In this study, we fabricated thin film inductors by using thin films manufacturing techniques such as photolithograghy and wet etching process, and the properties of these devices are measured at high frequency range of 1 MHz∼1 GHz. The accurate measuring technique by using network analyzer system having microstrip line was established. The inductors are fabricated with several ten micrometers by means of wet etching process known as easier and more economic than dry etching process. The properties of spiral-type thin film air core inductors with Wc = 300μm, dc = 70μm, number of turns = 10. and t_{cu} = 12μm were found to have Q of 4. L of 50nH at 300MHz and f_{R} of 300MHz.