• Title, Summary, Keyword: ferrite inductor

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Optimized Design of Low Voltage High Current Ferrite Planar Inductor for 10 MHz On-chip Power Module

  • Bae, Seok;Hong, Yang-Ki;Lee, Jae-Jin;Abo, Gavin;Jalli, Jeevan;Lyle, Andrew;Han, Hong-Mei;Donohoe, Gregory W.
    • Journal of Magnetics
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    • v.13 no.2
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    • pp.37-42
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    • 2008
  • In this paper, design parameters of high Q (> 50), high current inductor for on-chip power module were optimized by 4 Xs 3 Ys DOE (Design of Experiment). Coil spacing, coil thickness, ferrite thickness, and permeability were assigned to Xs, and inductance (L) and Q factor at 10 MHz, and resonance frequency ($f_r$) were determined Ys. Effects of each X on the Ys were demonstrated and explained using known inductor theory. Multiple response optimizations were accomplished by three derived regression equations on the Ys. As a result, L of 125 nH, Q factor of 197.5, and $f_r$ of 316.3 MHz were obtained with coil space of $127\;{\mu}m$, Cu thickness of $67.8\;{\mu}m$, ferrite thickness of $130.3\;{\mu}m$, and permeability 156.5. Loss tan ${\delta}=0$ was assumed for the estimation. Accordingly, Q factor of about 60 is expected at tan ${\delta}=0.02$.

An LTCC Inductor Embedding NiZn Ferrite and Its Application (NiZn 페라이트를 내장한 LTCC 인덕터 및 응용)

  • Won, Yu-June;Kim, Hee-Jun
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.10
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    • pp.534-539
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    • 2006
  • An integrated inductor using the low-temperature co-fired ceramics(LTCC) technology for low-power electronics was fabricated. In the inductor NiZn ferrite sheet$({\mu}_r=230)$, was embedded to increase inductance. The inductor has Ag spiral coil with 14 turns$(7turns{\times}2layers)$, a dimension of 0.6mm in width, 10um in thickness, and 0.15mm pitch. To evaluate the inductance, including the parasitic resistance, the fabricated inductor was calculated and measured. It was confirmed that calculated values were very close to the measured values. Finally as an application of the LTCC integrated inductor to low power electronic circuits, a LTCC boost DC/DC converter with 1W output power and up to 0.5MHz switching frequency using the inductor fabricated was developed.

Embedded Ferrite Film Inductor in PCB Substrate (PCB기판에 임베디드 된 페라이트 필름 인덕터)

  • Bae, Seok;Mano, Yasuiko
    • Journal of the Korean Magnetics Society
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    • v.15 no.1
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    • pp.30-36
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    • 2005
  • Recently, It has been reported that the spin sprayed ferite film shows better magnetic properties at high frequeny that the ferrite by co-firing over $800^{\circ}C$ . Besides, there is no limitation to select the substrate materials because it can be processed with relatively low temperature below $100^{\circ}C$. Therefore, we fabricated film inductor as a passive device for DC-DC converter by a use of spin sprayed embedded form was completed by via hole process of pad opening. Saturation magnetization of 0.61 T and real part of permeability of 110 were obtained in Ni-Zn ferrite. In addition, inductance of 1.52 ${\mu}H$, quality factor of 24.3 at 5 MHz were measured with spiral 16 turn inductor. The rated current of inductor was 863 mA.

An LTCC Inductor Embedding NiZn Ferrite and Its Application (NiZn 페라이트를 내장한 LTCC 인덕터 개발 및 응용)

  • Won, Yu-June;Kim, Hee-Jun
    • Proceedings of the KIEE Conference
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    • pp.939-940
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    • 2006
  • An integrated inductor using the low-temperature co-fired ceramics(LTCC ) technology for low-power electronics was fabricated. In the inductor NiZn ferrite sheet(${\mu}_r=230$), was embedded to increase inductance. The inductor has Ag spiral coil with 14 turns($7turns{\times}2layers$), a dimension of 0.6mm in width, 10um in thickness, and 0.15mm pitch. To evaluate the inductance, including the parasitic resistance, the fabricated inductor was calculated and measured. It was confirmed that calculated values were very close to the measured values. Finally as an application of the LTCC integrated inductor to low power electronic circuits, a LTCC buck DC/DC converter with 1W output power and up to 0.5MHz switching frequency using the inductor fabricated was develop.

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Power Bus Noise Analysis on IC using Wide-Band Ferrite Bead Model (광대역 페라이트 비드 모델을 이용한 IC 전원단의 잡음해석)

  • 이신영;손경주;최우신;이해영
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.14 no.12
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    • pp.1276-1282
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    • 2003
  • The SMT(Surface Mount Type) ferrite bead used to reduce the influx of power bus noise is modeled with parallel capacitor(C), series resistor(R) and series inductor(L). The simple equivalent circuit modeling doesn't agree with the measurement result. In this paper, we proposed the accurate equivalent circuit model of the ferrite bead at wide frequency range(50 MHz∼3 GHz) and analyzed the noise effect to the high speed IC(Integrate Circuit) with ferrite bead or not.

Inductor Design Method of DCM Interleaved PFC Circuit for 6.6-kW On-board Charger

  • You, Bong-Gi;Lee, Byoung-Kuk;Kim, Dong-Hee
    • Journal of Electrical Engineering and Technology
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    • v.12 no.6
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    • pp.2247-2255
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    • 2017
  • Because the on-board charger (OBC) is installed in electric vehicles (EVs), high power density is regarded as a key technology. Among components of the OBC, inductors occupy more than 30% of the total volume. Thus, it is important to reduce the volume and the weight of inductors while maintaining thermal stability. Discontinuous conduction mode (DCM) can satisfy these requirements; however, only a few studies have adopted the DCM operation for OBCs because of the large inductor current ripple. In this paper, a design process is proposed for application of the DCM operation to OBCs. In order to analyze the inductor losses accurately, a numerical formula for the inductor current ripple is deduced based on a detailed analysis. Two inductors are fabricated using several ferrite cores and powder cores taking into consideration the inductor size, inductor losses, and temperature rise. In order to verify the analysis and design process, experimental results are presented that show that the designed inductors satisfy the requirements of the OBCs.

Synthesis of Nano-sized NiCuZn-ferrites for Chip Inductor and Properties with Calcination Temperature (칩인덕터용 NiCuZn-ferrites 나노 분말합성 및 하소 온도에 따른 특성 변화)

  • 허은광;김정식
    • Journal of the Korean Ceramic Society
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    • v.40 no.1
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    • pp.31-36
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    • 2003
  • In this study, nano-sized NiCuZn-ferrites for the multi-layered chip inductor application were prepared by a coprecipitation method and its electromagnetic properties were analyzed. Also, the property of low temperature sintering were studied with the initial heat treatment of powder.$(Ni_{0.4-x}Cu_xZn_{0.60})_{1+w}(Fe_2O_4)_{1-w}$ (x=0.2, w=0.03) were calcined at $300^{circ}C~750^{circ}C.$ The sintered NiCuZn-ferrites at $900^{\circ}C$ showed good apparent density $4.90g/cm^3,$ and magnetic properties of initial permeability 164 and quality factor 72. As the calcination temperature increase, the grain size of NiCuZn-ferrite increased with irregular grain distribution and its magnetic properties were deteriorated.

The Variation of Permeability and$Q_{max}$ Frequency with Processing Parameters in NiCuZn Ferrites (제조 공정 Parameter에 따른 NiCuZn Ferrite의 투자율과 $Q_{max}$ 주파수 변화)

  • 신재영;박지호;박진채;한종수;송병무
    • Journal of the Korean Magnetics Society
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    • v.7 no.1
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    • pp.19-24
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    • 1997
  • Composition and process conditions for low temperature sintered NiCuZn ferrites were investigated, so as to fabricate multilayered chip inductor. The$Fe_2O_3$ deficiency for low temperature sintering was decreased with NiO contents of NiCuZn ferrites. The permeability of NiCuZn ferrites can be controlled in the range of 12~562 with the variation of NiO and $Co_3O_4$ contents. The $Q_{max} $ frequency of NiCuZn ferrites was decreased from 50 MHz to 3 MHz linearly with permeability increase from 60 to 560. The relation between the $Q_{max}$ frequency(Y) and permeability(X) of NiCuZn ferrites was expressed with the following empirical equation, logY=4.2-1.4logX.

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Phase Shift Full Bridge Converter for Sever Power using a New Separated Leakage Inductor Winding (SLW) Method

  • Cho, Kyu-Min;Kim, Young-Do;Cho, In-Ho;Moon, Gun-Woo
    • Proceedings of the KIPE Conference
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    • pp.517-519
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    • 2008
  • A new transformer winding method is proposed in this paper. Generally, PWM ZVS topologies use a leakage inductor to achieve ZVS operation. However, the leakage inductance of the transformer is not often enough to meet ZVS condition. Therefore, an additional leakage inductor is necessary, which causes large core loss because high input voltage is applied to the additional leakage inductor during a short commutation period. In this paper, a new separated leakage inductor winding (SLW) method is proposed. With the proposed winding method, a leakage inductor and a transformer can be combined in one ferrite core. Therefore, size and core loss of the additional leakage inductor can be reduced. Experimental results demonstrate that the proposed winding method can achieve a significant efficiency improvement in a 1210.8W (12V, 100.9A) prototype converter.

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