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Fe-Si-Al 합금 분말 · 고무 복합 자성체의 전파 흡수 특성
이경섭,윤여춘,최광보,김성수,이준영,Lee Kyung-Sub,Yoon Yeo-Choon,Choi Gwang-Bo,Kim Sung-Soo,Lee Jun-Young 한국전자파학회 2005 한국전자파학회논문지 Vol.16 No.2
준 마이크로파 대역용 전자파 노이즈의 흡수체로서 자성 복합 시트를 개발하였다. Fe-Si-Al 자성 분말을 attrition mill을 이용해 편상화한 후 이것을 polymer와 혼합 분산시켜 전자파의 입사 방향에 수직한 방향으로 배향된 자성 복합 시트를 제조하였다. Attrition milling 시간이 긴 편상 분말일수록 제조된 자성 복합체의 유전율은 증가하나 투자율은 다소 감소하는 경향을 보인다. 또한 오랜 시간 milling한 편상 분말일수록 임피던스 정합 주파수는 저주파 쪽으로 이동하나 정합 주파수에서의 전자파 흡수율은 감소한다. 이러한 결과들로부터 복합 자성체의 유전율과 투자율의 주파수 특성을 제어하여 1.4 GHz에서 -8.2 dB의 반사 손실 특성을 갖는 두께 1.0 mm의 노이즈 흡수 시트를 개발하였다. A magnetic composite as noise absorber of quasi-microwave band was developed. The Fe-Si-Al alloy powder were forged by attrition mill to get flaky shape. The magnetic composite sheet was fabricated in which powders are dispersed in polymer and aligned in the direction perpendicular to electromagnetic wave propagation. The permittivity of magnetic composite is increased as forging time increasing, while the permeability is decreased slightly. The maximum attenuation peak of reflection loss is shifted to lower fiequency range as milling time increasing, and the value of maximum attenuation peak is to get smaller gradually. From these result, we could designed a noise absorber sheet (t=1.0 mm) for quasi-microwave band, which is impedance matched at 1.4 GHz with respect to -8.2 dB reflection 1055.
1.5V 60A급 VRM의 인덕터 손실 분석에 관한 연구
전현(hyun Jeon),이달우(darl-woo Lee),안태영(tae-young Ahn),최광보(gwang-bo Choi) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
In this paper, to report the experimental results the core losses of VRM inductor. The VRM, that has a output voltage 1.5V, output current 60A, maximum power of 90W. Experimental results verify, the VRM has a almost same data of fast transient response, a efficiency test with high flux and ferrite inductor. A maximum power conversion efficiency of the experimental VRM was measured at 92% within 0.2% load regulation.
PFC용 Boost 컨버터의 금속분말 인덕터에 관한 연구
김윤성(Yun-Sung Kim),안태영(Tae-Young Ahn),장평우(Pyung-Woo Jang),정인범(In-Bum Jeong),최광보(Gwang-Bo Choi) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
In this paper, the experiment and simulation results of the Boost converter for PFC(power factor correction) using metal powder inductor are presented. The metal powder inductor used in the experiment was composed of Ni-Fe-Mo, Ni-Fe, Fe-Si-Al compound respectively. The performance of the 500W class PFC rectifier with the average current mode control and the 300W class PFC rectifier with the variable frequency control, are evaluated.
금속분말 코어를 이용한 1kW급 PFC용 Boost 컨버터에 관한 연구
주정규(Jeong-Kyu Ju),안태영(Tae-Young Ahn),장평우(Pyung-Woo Jang),정인범(In-Bum Jeong),최광보(Gwang-Bo Choi) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
In this paper, the experiment results of the Boost converter for PFC(power factor correction)are presented The performance of the 1kW class PFC rectifier with the average current mode control are evaluated. A 1kW, 100kHz System prototype was built and experimental results are presented to verify the design. As a results, power conversion efficiency above 95% and power factor above 99% were obtained.