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RISS 인기검색어
- 검색키워드
- 저자 : Fumikazu Takahashi (검색결과 3 건)
- 무료
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Shin Saito,Fumikazu Hoshi,Daiji Hasegawa,Migaku Takahashi 한국자기학회 2002 Journal of Magnetics Vol.7 No.3
We proposed a novel method to evaluate the magnetic properties of the initial layer and the columnar structure separately for CoCr-based perpendicular recording media. We show that the thickness of the initial layer and the intrinsic magnetocrystalline anisotropy of columnar structure can be quantitatively evaluated using the plotted product of perpendicular anisotropy to magnetic film thickness versus magnetic film thickness (K^(exp.)_(u⊥) × d_(mag). vs. d_(mag). plot). Based on the analyses, it is found that: (1) compared with CoCrPtTa media, CoCrPtB media have relatively thin initial layer, and have fine grains with homogeneous columnar structure with c-plane crystallographic orientation; (2) CoCrPtB media can be grown epitaxially on Ru or CoCr/C intermediate layer, and as the result, the magnetic properties of the media within thin thickness region of d_(mag). ≤ 20 ㎚ is significantly improved; (3) the key issue of material investigation for CoCr-based perpendicular recording media will be focused on how to fabricate c-plane-oriented columnar grains well isolated with nonmagnetic substance in epitaxial-growth media, while maintaining the thermal stability of the media.
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Current Sensing Methods for Standby Power Control of Digital-Controlled DC/DC Converter
Yen-Shin Lai,Zih-Jie Su,Chia-An Yeh,Fumikazu Takahashi,Masahiro Hamaogi 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
The main theme of this paper is to study the current sensing methods for standby power reduction control of digital-controlled DC/DC converter. These methods include using transformer of full-bridge converter, coupling inductor and ORing MOSFET. The most suitable sensing method was verified with a digital-controlled 500W class DC/DC converter (input/output voltage: 400V/12V). Experimental results derived from digital-controlled DC/DC converter using the TI DSP (TMS320F2812) as the control platform show that current sensed by voltage across ORing MOSFET method provides superb solution. This method offers linear relationship between output voltage of sensing circuit and load current while not causing response delay under standby conditions and thereby truly reflecting accurate standby conditions.
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Current Ripple Reduction Technique of DC/DC Converter
Ye-Then Chang,Chia-An Yeh,Masahiro Hamaogi,Fumikazu Takahashi,Yen-Shin Lai 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
This paper presents a novel method to reduce the current ripple caused by the variation of inductor for a DC/DC converter. The presented method is to increase the switching frequency to keep constant current ripple when the inductance changes. Therefore, no extra component is required. The problem will be described first and the related method is presented. An experimental DC/DC converter is implemented which is with input voltage of 12 V, output voltage of 1.5 V, output current of 10 A, and switching frequency of 200-250 ㎑. Finally, experimental results derived from the designed digital-controlled DC/DC converter are included for confirmation.
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