• Title/Summary/Keyword: Equivalent Circuit Model

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Equivalent Circuit Modeling of Rosen-type Multilayer Piezoelectric Transformer (Rosen형 적층 압전변압기의 등가회로 모델링)

  • Shin, Hoon-Beom;Lee, Yong-Kuk;Yu, Young-Han;Ahn, Hyung-Keun;Han, Deuk-Young
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.19 no.12
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    • pp.1099-1105
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    • 2006
  • In this paper, the equivalent circuit model of a Rosen-type multilayer piezoelectric transformer(MPT) has been proposed based on the Mason's equivalent circuit model and the principle of single layer piezoelectric plate. From the piezoelectric direct and converse effects, the symbolic expressions between the electric inputs and outputs of the MPT have been derived from the equivalent circuit model. A simplified equivalent circuit model of the MPT whose driving part has a single input form has been proposed. The symbolic expressions of the driving part have been derived from the simplified equivalent circuit model and the model was compared with the multi-input equivalent circuit model through the simulation. In the comparisons between the simulation results and the experimental data, output voltage is 630 Vp-p in case of 11-layered MPT and 670 Vp-p for 13-layered MPT over the experiment range. As the load resistance increases, output voltage increases and saturates over $300k{\Omega}$ and the resonant frequency changes from 102 kHz to 103 kHz. The simulation and the experimental results agree well over different load resistances and frequencies.

Equivalent Circuit Modeling of Wideband Underwater Acoustic Piezoelectric Vibrator (광대역 수중 음향 압전 진동체의 등가회로 모델링)

  • 조치영;김원호;윤형규
    • Journal of KSNVE
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    • v.6 no.5
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    • pp.645-652
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    • 1996
  • In this paper an identification method is presented to obtain the equivalent electric circuit model of a wideband underwater acoustic piezoelectric vibrator. Unknown parameters involved in the equivalent circuit are indentified using the measured electrical admittances in air. The proposed method is applied to an example transducer. The validity of equivalent circuit model is demonstrated by the comparison between the experimental measurements and analytical calculations of TVR(transmitting voltage response) in water.

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Frequency-Variant Power and Ground Plane Model for Electronic Package (패키지의 주파수 의존형 파워 및 그라운드 평판 모델)

  • 이동훈;어영선
    • Proceedings of the IEEK Conference
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    • 1999.06a
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    • pp.385-388
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    • 1999
  • A new frequency-variant equivalent circuit model of power/ground plane is presented. The equivalent circuit is modeled with grid cells. The circuit parameters of each cell were extracted by using Fasthenry. To verify the developed circuit model, its s-parameters are compared with the measured s-parameters 〔2〕 and the full-wave simulation-based s-parameters. Consequently, it is shown that our frequency-variant equivalent circuit model can accurately predict imperfect ground effects under the high frequency operation of electronic package.

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An Equivalent Circuit Model for a Dumbbell-Shaped DGS Microstrip Line

  • Woo, Duk-Jae;Lee, Taek-Kyung
    • Journal of electromagnetic engineering and science
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    • v.14 no.4
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    • pp.415-418
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    • 2014
  • This paper presents an equivalent circuit model for a dumbbell-shaped defected ground structure (DGS) in a microstrip line. The effects of equivalent circuit elements of a dumbbell-shaped DGS and their magnetic coupling to the host transmission line are modeled as a simple lumped-element circuit. In addition, simple approximate expressions to determine the main circuit parameters for this model are presented. The transfer characteristic calculated by the proposed circuit model is compared with the results of EM simulation and measurement.

Wall Voltage Characteristics Simulated Using an Equivalent Circuit Model for AC POPs

  • Kim, Joon-Yub;Lim, Jong-Sik
    • 한국정보디스플레이학회:학술대회논문집
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    • 2003.07a
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    • pp.317-320
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    • 2003
  • As a convenient means for the characterization of the wall voltage and wall charge of AC PDPs during the sustain period, an equivalent circuit model for AC PDPs is presented. The equivalent circuit model for AC PDPs consists of capacitors and thyristors. The equivalent circuit model is based on the physical structure of the AC PDP and the I-V characteristic of the discharge space. This equivalent circuit model can be easily implemented in the standard simulators such as SPICE and can easily simulate the variation of the current, charge and voltage involved in AC PDPs as the supply voltage varies.

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High-Frequency Equivalent Circuit Model for Differential Mode Noise Analysis of DC-DC Buck Converter (DC-DC 벅 컨버터의 차동모드 노이즈 분석을 위한 고주파 등가회로 모델)

  • Shin, Juhyun;Kim, Woojung;Cha, Hanju
    • KEPCO Journal on Electric Power and Energy
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    • v.6 no.4
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    • pp.473-480
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    • 2020
  • In this paper, we proposed a high frequency equivalent circuit considering parasitic impedance components for differential noise analysis on the input stage during DC-DC buck converter switching operation. Based on the proposed equivalent circuit model, we presented a method to measure parasitic impedance parameters included in DC bus plate, IGBT, and PCB track using the gain phase method of a network analyzer. In order to verify the validity of this model, a DC-DC prototype consisting of a buck converter, a signal analyzer, and a LISN device, and then resonance frequency was measured in the frequency range between 150 kHz and 30 MHz. The validity of the parasitic impedance measurement method and the proposed equivalent model is verified by deriving that the measured resonance frequency and the resonance frequency of the proposed high frequency equivalent model are the same.

Equivalent Circuit Model of RF passive components based on its simulated frequency response data (EM Solver 의 주파수 응답 데이터를 이용한 RF 수동 소자의 등가회로 모델링에 관한 연구)

  • Oh, Sang-Bae;Ko, Jae-Hyeong;Han, Hyeong-Seok;Kim, Hyeong-Seok
    • 한국정보통신설비학회:학술대회논문집
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    • 2007.08a
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    • pp.27-30
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    • 2007
  • This paper deals with an equivalent circuit model for RF passive components. Rational functions are obtained from the frequency responses of EM simulation by using Foster canonical partial fraction expressions. The Vector Fitting(VF) and the Adaptive Frequency Sampling(AFS) scheme are also implemented to obtain the rational functions. A passivity enforcement algorithm is applied to ensure the stability of the equivalent circuit model. In order to verify the schemes, S parameters of the equivalent circuit model is compared to those of EM simulation in case of the microstrip line structure with 3 slots in ground.

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New Equivalent Circuit of a Synchronous Machine (동기식의 새로운 등가회로)

  • 박민호;현동석
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.34 no.11
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    • pp.440-444
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    • 1985
  • Voltage equations of a synchronous machine are derived from the electromagnetic field theory in order to develop a new equivalent circuit model considering core loss. The result from the new equivalent circuit model is superior to that of the conventional one in the analysis of machine performance and characteristics on optimal efficiency control of a synchronous motor.

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Equivalent Circuit Modeling Applying Rational Function Fitting (유리함수 근사를 이용한 등가회로 모델링)

  • Paek, Hyun;Ko, Jae-Hyung;Kim, Kun-Tae;Kim, Hyeong-Seok
    • Journal of The Institute of Information and Telecommunication Facilities Engineering
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    • v.8 no.1
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    • pp.1-5
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    • 2009
  • In this paper, we propose a method that applies Vector Fitting (VF) technique to the equivalent circuit model for RF passive components. These days wireless communication system is getting smaller and smaller. So EMI/EMC is an issue in RF. We can solve PI/SI (Power Integrity/Signal Integrity) that one of EMI/EMC problem apply IFFT for 3D EM simulation multiple with input signal. That is time consuming task. Therefore equivalent circuit model using RF passive component is important. VF schemes are implemented to obtain the rational functions. S parameters of the equivalent circuit model is compared to those of EM simulation in case of the microstrip line structure.

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A Study for the Equivalent Circuit and Slow-Wave Factor of Defected Ground Structure Transmission Line (DGS 전송선로의 등가회로와 전파지연계수에 대한 재고찰)

  • Lim, Jong-Sik;Koo, Ja-Kyung;Han, Sang-Min;Jeong, Yong-Chae;Ahn, Dal
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.11
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    • pp.2041-2046
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    • 2008
  • A frequency-dependent slow-wave factor (SWF) and equivalent circuit model of transmission line with defected ground structures (DGS) is described. Once S-parameters of a DGS transmission line are given, the conventional frequency -independent equivalent circuit elements are extracted using 3dB cutoff and resonant frequencies (Fc and Fo) as the first step. Using the initial equivalent elements and simple transmission line theories, a frequency-dependent equivalent transmission line model is established through an analytical method, and finally the frequency dependent SWF is calculated. The proposed equivalent circuit model and SWF are frequency-dependent and more reliable because even small insertion loss within available passband is considered, while they have been independent of frequency.