• Title, Summary, Keyword: ferrite inductor

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Magnetic Properties of NiZnCu Ferrite for Multilayer Chip Inductors (칩인덕터용 NiZnCu Ferrite의 자기적 특성 연구)

  • An, Sung-Yong;Moon, Byeong-Chol;Jung, Hyun-Chul;Jung, Hyun-Jin;Kim, Ic-Seob;Hahn, Jin-Woo;Wi, Sung-Kwon
    • Journal of the Korean Magnetics Society
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    • v.18 no.2
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    • pp.58-62
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    • 2008
  • $Ni_{0.4}Zn_{0.4}Cu_{0.2}Fe_2O_4$ ferrite was fabricated by solid stat reaction method and sol-gel method. Because of the drawbacks of each method, we combined these two methods together. We proposed and experimentally verified that nanocrystalline ferrite additive was effective on improving the densification behavior and magnetic properties of NiZnCu ferrites for multilayer chip inductors. The initial permeability of the toroidal core Sample with 20 wt% nanocrystalline ferrite increased from 78.1 to 178.2 as annealing temperature is increased from $880^{\circ}C$ to $920^{\circ}C$. The density, shrinkage and saturation magnetization were increased with increasing annealing temperature, which was attributed to the decrease of additive grain size and increase of sintering density.

Optimization of Powder Core Inductors of Buck-Boost Converters for Hybrid Electric Vehicles

  • You, Bong-Gi;Kim, Jong-Soo;Lee, Byoung-Kuk;Choi, Gwang-Bo;Yoo, Dong-Wook
    • Journal of Electrical Engineering and Technology
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    • v.6 no.4
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    • pp.527-534
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    • 2011
  • In the present paper, the characteristics of Mega-Flux$^{(R)}$, JNEX-Core$^{(R)}$, amorphous and ferrite cores are compared to the inductor of buck-boost converters for Hybrid Electric Vehicles. Core losses are analyzed at the condition of 10 kHz sine wave excitations, and permeability fluctuations vs. temperature and magnetizing force will be analyzed and discussed. Under the specifications of the buck-boost converter for 20 kW THS-II, the power inductor will be designed with Mega-Flux$^{(R)}$ and JNEX-Core$^{(R)}$, and informative simulation results will be provided with respect to dc bias characteristics, core and copper losses.

Electromagnetic Simulation & Electrical.Optical Characteristics by Changing Ferrite Position in Antenna (안테나에서 페라이트 위치 변화에 따른 전자계 시뮬레이션과 전기적.광학적 특성)

  • Lee, Joo-Ho;Yang, Jong-Kyung;Lee, Jong-Chan;Choi, Myung-Hyun;Kim, Byung-Tack;Park, Dae-Hee
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.5
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    • pp.816-820
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    • 2008
  • The RF inductive discharge of inductively couples plasma (ICP) continues to attract growing attention as an effective plasma source in many industrial applications, the best known of which are plasma processing and lighting technology. Although most practical ICPs operate at 13.56 [MHz] and 2.65 [MHz], the trend to reduce the operating frequency is clearly recognizable from recent ICP developments. In an electrodeless fluorescent lamp, the use of a lower operating frequency simplifies and reduces cost of RF matching systems and RF generators and can eliminate capacitive coupling between the inductor coil and plasma, which could be a strong factor in wall erosion and plasma contamination. In this study, We discussed simulation and experimental results when changing ferrite position in antenna.

A Wireless Intraocular Pressure Sensor with Variable Inductance Using a Ferrite Material

  • Kang, Byungjoo;Hwang, Hoyong;Lee, Soo Hyun;Kang, Ji Yoon;Park, Joung-Hu;Seo, Chulhun;Park, Changkun
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.13 no.4
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    • pp.355-360
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    • 2013
  • A wireless intraocular (IOP) pressure sensor based on micro electro mechanical system (MEMS) technology is proposed. The proposed IOP sensor uses variable inductance according to the external pressure. The proposed sensor is composed of two flexible membranes: a ferrite bottom part, an inductor, and a capacitor. The inductance of the sensor varies according to the external pressure. The resonance frequency of the sensor is also varied, and this frequency is detected using an external coil. The external coil is designed with an FR-4 printed circuit board. The feasibility of the proposed sensor structure using variable inductance to detect the external pressure is successfully demonstrated.

Characteristics Analysis of a Forward Converter by Finite Element Method and State Variables Equation (유한요소법과 상태방정식을 이용한 포워드 컨버터의 동작 특성 해석)

  • Park, Seong-Jin;Gwon, Byeong-Il;Park, Seung-Chan
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.48 no.9
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    • pp.467-475
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    • 1999
  • This paper presents an analysis method of a forward converter, using both the finite element method considering the external circuit and a state variables equation. The converter operates at 50kHz and its one period is divided into two modes for the simplicity of the analysis. In the first mode, the switching transistor turns on and an input power is transferred into the load by the electromagnetic conversion action of a ferrite transformer. In the second mode, the switching transistor turns off and the stored energy in an inductor is delivered to the load, and the transformer core is demagnetized by the reset winding current. In this paper, time-stepping finite element method taking into account the on-state electrical circuit of the converter in used to analyze both the electrical circuit and electromagnetic field of the magnetic device during the first mode and the demagnetization period of the transformer core. Then a state variables equation for the circuit which the inductor current flows is constituted and solved during the second mode. As a result, the simulation results have been good agreement with the results obtained form experiment.

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Study on operating characteristics of Ferrite cores for Flat TR in high frequency (Flat TR용 페라이트 코아의 고주파 동작 특성)

  • Han, Se-Won;Cho, Han-Goo;Ryu, Dong-Uk;Choi, Kwang-Bo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.1168-1171
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    • 2003
  • In contrast to a conventional transformer, the flat transformer is made using a number of small ferrite cores. Two cores for transformer and one core for inductor, which composed one module. Many modules can be connected together to form a flat matrix transformer. This structural arrangement eliminates the single hot spot problem in conventional transformers and permits high current density pertains at high frequency. In this study, the ferrite magnetic cores of Mn-Zn system for the Flat transformer were manufactured and the electrical and magnetic characteristics of its tested. The power loss of sample FO2(Mn-Zn ferrite) sintered at $1350^{\circ}C$ was $350kW/m^3$ in test conditions of 250kHz, 200mT and $100^{\circ}C$, which showed the good power loss property in high frequency. The power loss of FO2 samples has been studied as a function of magnetic flux density and frequency. Steinmetz exponent was 2.82 at 250kHz and 2.73 at 500kHz. These results illustrated the switching of power loss mechanism in ferrite core from hysteresis losses to eddy current losses or others.

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A study on core loss analysis of 1.5V 60A class VRM (1.5V 60A급 VRM의 인덕터 손실 분석에 관한 연구)

  • Jeon, Hyun;Lee, Darl-Woo;Ahn, Tae-Young;Choi, Gwang-Bo
    • Proceedings of the KIPE Conference
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    • pp.449-451
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    • 2005
  • 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.

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The magnetic properties of ferrite for chip-induotor about 2GMz (2GHz 대역 Chip-Inductor용 자성재료의 자기적 특성)

  • 정승우;김태원;최우성
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.205-208
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    • 1999
  • We have studied properties(crystal structure, density, absorption, contraction, initial permeability, and permeability) of Ba$\sub$0.2/Me$\sub$0.31/Fe$\sub$0.49/(Me:Ni$\sub$1-x/, Cu$\sub$x/ x=0~1) ferrites with various Me site, because of development of magnetic materials for inductor. As a results of the density, absorption rate, and shrinkage rate, the sintering temperature of Ba$\sub$0.2/ Me$\sub$0.31/ FEesub 0.49/(Me:Ni$\sub$1-x/ x=0.25, 0.75) had got over 1100$^{\circ}C$ for 3 hours. According to SEM images, the configurations of grain were hexagonal, Increasing the sintering temperature, initial Permeability increased. The complex permeabilities as a function of for several MHz showed constants.

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Performance Characteristics of an Inductively Coupled Magnetic Probe Developed for Off-line Monitoring of a Rotating Machine (발전기 정지중 진단을 위하여 개발된 유도결합 마그네틱 프로브의 성능특성)

  • Park, Noh-Joon;Yang, Sang-Hyun;Kong, Tae-Sik;Kim, Hee-Dong;Park, Dae-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.46-46
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    • 2010
  • In order to detect exact corona discharge point at stator winding of a rotating machine, an inductively coupled magnetic probe has been developed, which consists of U-shaped and truncated manganese ferrite inductor as a helix. The measured current intensity is somewhat higher than commercially developed probe. It has been shown that the measured intensity of proposed probe is suitable for manual localization as to off-line stator winding monitoring of rotating machine.

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Property Changes of Chip Inductors by Varying the Solid Loading of Ferrite Pastes (페라이트 페이스트의 고체함량에 따른 칩 인덕터의 특성변화)

  • 손승현;제해준;김병호
    • Journal of the Korean Ceramic Society
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    • v.36 no.3
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    • pp.284-292
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    • 1999
  • 고체함량을 변화시킨 NiCuZn 페라이트 페이스트를 사용하여 스크린 인쇄법으로 7.7$\times$4.5$\times$1.0 nm 크기의 칩인덕터를 제조한 후, 페라이트 페이스트의 고체함량에 따른 수축률, 소결밀도, 미세구조, 계면반응 등의 물리적 특성 및 자기적 특성 변화를 분석하였다. 조온소결을 위하여 attrition milling 공정을 통하여 미세분말을 준비하였으며, 소결온도는 880~94$0^{\circ}C$로 변화시켰다. 90$0^{\circ}C$에서 2시간 열처리된 페라이트 후막의 소결밀도는 고체함량이 50,55,60%로 증가할수록 5.12,5.14,5.18g/㎤로 증가하였으며, 이에 따라 칩 인덕터 시편들의 주파수 10 MHz에서 L값이 2.1,2.3,2.5 $\mu$H로 커졌다.Q값은 소결밀도 증가에 의한 Q값 증가효과와 아울러 입자가 커짐에 따른 반대효과로 인하여 고체함량에 따라 87,90,94로 큰 변화가 없었다. 페라이트 페이\ulcorner의 고체함량 및 소결온도와 무관하게 Ag 성분의 페라이트 쪽으로의 확산현상은 나타나지 않았다.

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