• 제목/요약/키워드: Equivalent circuit model

검색결과 650건 처리시간 0.025초

ME 소자의 저주파 등가회로 모델링 (Electric Circuits Modeling of Magnetoelectric Bulk Composites in Low Frequency)

  • 정수태;류지구
    • 한국전기전자재료학회논문지
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    • 제26권7호
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    • pp.515-521
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    • 2013
  • Magnetoelectric(ME) bulk composites with PZT-PNN-PZN/$Fe_2O_4$ were prepared by using a conventional ceramic methods and investigated on the ME voltage vs frequency of ac magnetic fields. We made the electric equivalent circuits by using the Maxwell-Wagner model and simulated the frequency dependence of ME voltage in low frequency region. ME devices were described by a series of two equivalent circuits of piezoelectric and magnetic, which have the relaxation time ${\tau}$ due to the interaction between ME device and load resistor. Equivalent circuit of piezoelectric material is independent of frequency. However ferrite magnetic materials have Debye absorption and dipolar dispersion, whose equivalent circuit is a function of frequency. Therefore we suggest the resistance in the equivalent circuit is proportion to $1+{\omega}^2{\tau}^2$ and the capacitance is in inverse proportion to $1+{\omega}^2{\tau}^2$ in the magnetic materials.

Characteristics Analysis of Single Phase Induction Motor via Equivalent Circuit Method and Considering Saturation Factor

  • Cho, Su-Yeon;Kim, Won-Ho;Jin, Chang-Sung;Kang, Dong-Woo;Lee, Ju
    • Journal of Electrical Engineering and Technology
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    • 제9권1호
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    • pp.178-183
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    • 2014
  • This paper presents a motor characteristics analysis method using an equivalent circuit. Motor characteristics analysis via equivalent circuit is very important for designing a high efficiency single phase induction motor. The accuracy of the motor characteristics depends on the accuracy of the parameters, especially saturation factor, which determines the cyclical relationship in the analysis process. Therefore, using the proposed method, the saturation factor was calculated using the iteration routine and numerical technique. The proposed method was verified by comparing the finite element method results and the dynamo test results of manufactured prototype model.

$Z_nO$ 바리스터의 유전특성 및 등가회로 (Dielectric Properties and Equivalent Circuit of $Z_nO$ Varistor)

  • 허진석;박상호;강대하
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2003년도 하계학술대회 논문집 C
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    • pp.1418-1420
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    • 2003
  • In this study capacitance and dielectric loss tan${\delta}$were measured with frequency changes for commercial $Z_nO$ varistors with pin-type leads and equivalent circuit simulation was proposed. The leakage inductance in pin leads and the stray caoacitance could be seperated from the dielectric characteristics of $Z_nO$ varistors by the simulation of equivalent circuit. The equivalent circuit model considered semiconduction layer, dielectric layer and depletion layer as the grain boundary structure of varistor is well fitted to the observed data.

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$ITO/TPD/Alq_3/Al$ 유기발광소자의 등가회로 분석 (Equivalent-Circuit Analysis of Organic Light-Emitting Diodes in $ITO/TPD/Alq_3/Al$)

  • 안준호;오용철;홍진웅;이준웅;송민종;김태완
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2004년도 하계학술대회 논문집 Vol.5 No.1
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    • pp.188-191
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    • 2004
  • We have investigated equivalent-circuit analysis of organic light-emitting diodes in $ITO/TPD/Alq_3/Al$. Complex impedance Z of the device was measured in the frequency range of $40Hz{\sim}1MHz$. We are able to interpret the frequency-dependent response in terms of equivalent-circuit model of contact resistance $R_s$ in series with two parallel combination of $R_{TPD},\;C_{TPD}\;and\;R_{Alq3},\;C_{Alq3}$.

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Design and Characteristic Analysis of LSM for High Speed Train System using Magnetic Equivalent Circuit

  • Ham, Sang-Hwan;Cho, Su-Yeon;Kang, Dong-Woo;Lee, Hyung-Woo;Chan, Hong-Soon;Lee, Ju
    • International Journal of Railway
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    • 제3권1호
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    • pp.14-18
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    • 2010
  • This paper describes design and characteristic analysis of long primary type linear synchronous motor (LSM) for high speed train system. LSM is designed using loading distribution method and magnetic equivalent circuit. For characteristic analysis of LSM, analytical and numerical methods are applied. Analytical method for solving the magnetic field distribution of the analytic model is based on the Maxwell’s equations. Using the characteristic equation and magnetic equivalent circuit, we analyze the effect of variation of parameters, and then we validate the result by comparing with numerical method by finite element method (FEM). We compare the analytical method with numerical method for analyzing the effect by variable parameters. This result will be useful of design and forecast of performance without FEM.

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양자우물 레이저 다이오드의 등가회로 모델 (An Equaivalent Circuit Model for Rquantum Well Laser Diodes)

  • 이승우;김대욱;최우영
    • 전자공학회논문지D
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    • 제35D권1호
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    • pp.49-58
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    • 1998
  • In this paper, a new equivalent circuit model for quantum-well laser diode (LD) is proposed. The model includes carrier transport effects in the SCH region, and rprovides, in a stable and accurate manner, large-and small-signal responses of laser diode output power as function of injected currents. SPICE simulation was performed using the circuit model and results are presented for L-I characteristics, pulse and frequency responses under various conditions. It is expencted that the new equaivalent circuit model will find useful applications for designing and analyzing OEIC, LD driver circuits, and LD packaging.

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이중 공진을 고려한 소나 트랜스듀서의 전기적 등가회로 모델링 및 임피던스 변동에 따른 효과 분석 (Analysis of the Effects According to Changes in Impedance and Electrical Equivalent Circuit Modeling of a SONAR Transducer Considering Dual Resonance)

  • 목형수;최재혁;한수희;박상준;김성주;허준기
    • 전력전자학회논문지
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    • 제20권2호
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    • pp.144-151
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    • 2015
  • The present study proposes a method for modeling a SONAR transducer with dual resonance. The Butterworth van-Dyke (BVD) model, a conventional SONAR transducer modeling method, can model only one resonance point. Hence, to address its disadvantage and to model the dual resonance, a dual resonance BVD model consisting of two serial BVD models is proposed. The two BVD models are connected in a series, and each simulate resonance at low frequency and high frequency, which allows the modeling of two resonance points. Eight elements compose the equivalent circuit by connecting the BVD models in a series, which is twice as great as that of the existing BVD model. The element value of the dual resonance BVD model is extracted by using the particle swarm optimization method. Analysis was also performed to identify the effects of changes in the value of elements that compose the equivalent circuit on the impedance characteristics of the equivalent circuit through simulation in which element values varied.

광대역 디커플링 캐패시터 모델을 이용한 정확한 SSN 분석 (Accurate SSN Analysis using Wideband Decoupling Capacitor Model)

  • 손경주;권덕규;이해영;최철승;변정건
    • 한국전자파학회논문지
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    • 제12권7호
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    • pp.1048-1056
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    • 2001
  • 고속 다층 인쇄 회로 기판의 전원 평면과 접지 평면을 통해 전파되는 SSN 잡음의 영향을 감소시키기 위하여 일반적으로 디커플링 캐패시터를 사용한다. 본 논문에서는 디커플링 캐패시터에 대한 간단한 고주파 측정 방법 을 제시하고 고주파 기생 성분들을 고려한 광대역 (50 MHz ~3 GHz) 등가 회로 모델을 제안하였다. 제안된 모델은 SSN의 영향을 분석하기 위한 전원 평면과 접지 평면의 SPICE 모델과 쉽게 결합할 수 있다. 제안된 모델이 연결된 회로 해석 결과는 측정 결과와 잘 일치하며, 제안된 모델을 이용한 회로 해석을 통해 디커플링 캐패시터 값에 따른 잡음 감소 효과를 빠르고 정확하게 분석할 수 있음을 확인하였다.

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접촉연소식 센서의 열 특성 및 가스반응의 모델링 (Electrical modelling for thermal behavior and gas response of combustible catalytic sensor)

  • 이상문;송갑득;주병수;이윤수;이덕동
    • 센서학회지
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    • 제15권1호
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    • pp.34-39
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    • 2006
  • This study provides the electrical model of combustible catalytic gas sensor. Physical characteristics such as thermal behavior, resistance change were included in this model. The finite element method analysis for sensor device structure showed that the thermal behavior of sensor is expressed in a simple electrical equivalent circuit that consists of a resistor, a capacitor and a current source. This thermal equivalent circuit interfaces with real electrical circuit using two parts. One is 'power to heat' converter. The other is temperature dependent variable resistor. These parts realized with the analog behavior devices of the SPICE library. The gas response tendency was represented from the mass transferring limitation theory and the combustion theory. In this model, Gas concentration that is expressed in voltage at the model, is converted to heat and is flowed to the thermal equivalent circuit. This model is tested in several circuit simulations. The resistance change of device, the delay time due to thermal capacity, the gas responses output voltage that are calculated from SPICE simulations correspond well to real results from measuring in electrical circuits. Also good simulation result can be produced in the more complicated circuit that includes amplifier, bios circiut, buffer part.

열 잉크젯 프린트헤드의 집중질량 모델링 (Lumped Modeling of Thermal Inkjet Print Head)

  • 이유섭
    • 대한기계학회논문집B
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    • 제30권10호
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    • pp.942-949
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    • 2006
  • A lumped model is proposed to predict liquid ejection characteristics of a thermally driven inkjet print head. The model is based on a two-dimensional heat conduction equation, an empirical pressure-temperature equation and a nonlinear hydraulic flow-pressure equation. It has been simulated through the construction of an equivalent R-C circuit, and subsequently analyzed using SIMULINK and a circuit simulation tool, PLECS. Using the model, heating and cooling characteristics of the head are predicted to be in agreement with the IR temperature measurements. The effects of the head geometry on the drop ejection are also analyzed using the nonlinear hydraulic model. The present model can be used as a design tool for a better design of thermal inkjet print heads.