• JSTS:Journal of Semiconductor Technology and Science
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• 제15권3호
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• pp.356-364
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• 2015

The transmission performance of TSV considering the effect of electronic-thermal coupling is an new challenge in three dimension integrated circuit. This paper presents the thermal equivalent circuit (TEC) model of the TSV, and discussed the thermal equivalent parameters for TSV. Si layer is equivalent to transmission line according to its thermal characteristic. Thermal transient response (TTR) of TSV considering electronic-thermal coupling effects are proposed, iteration flow electronic-thermal coupling for TSV is analyzed. Furthermore, the influences of TTR are investigated with the non-coupling and considering coupling for TSV. Finally, the relationship among temperature, thickness of $SiO_2$, radius of via and frequency of excitation source are addressed, which are verified by the simulation.

• 전기학회논문지
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• 제62권2호
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• pp.270-277
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• 2013

Single phase induction motor(SPIM) is used widely because it is driven by single phase source. However, the efficiency of the motor is not good due to saturation of magnetic material. To analyze the motor accurately, the magnetic saturation characteristics should be considered in analysis of equivalent circuit. In this paper, lumped parameter of circuit are derived from multi phase induction motor using method of symmetrical coordinates. Also, we presents a method for the equivalent circuit analysis of SPIM using magnetic saturation rate. The magnetic nonlinearity is considered deriving magnetizing reactance from voltage-current saturation curve. As a results, current characteristic, torque, output and efficiency are shown through analysis of equivalent circuit. A simulation results of SPIM will be used to improve the characteristics and efficiency of motor.

• 지구물리와물리탐사
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• 제9권1호
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• pp.121-128
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• 2006

헬리콥터를 이용한 항공자력탐사는 정해진 고도를 따라 지표면에 평행하게 이루어지지만, 고해상도 탐사에서는 특히 측정이 이루어지는 고도가 너무 변화하여 평탄면으로 간주할 수 없는 경우가 있다. 이 연구에서는 모서리 효과를 조절할 수 있도록 주변 자력원이 포함되는 등가원 방법을 이용하여 이러한 자료를 변환하는 방법을 개발하였고, 3차원적으로 무작위하게 분포하는 점의 자료를 직접적으로 모델화하였다. 이 문제는 일반적으로 under-determined 이지만 CG 법은 최소 norm 해를 찾을 수 있으며, 자력이상을 자력원과 연관시키는 조화함수를 선택할 자유가 있는데, 상향연속 함수 연산자가 선택되면 등가원 자체가 자력이상이 된다. 기본자기장의 방향으로의 자기 쌍극자분포를 자력원으로 선택하면, 자기 쌍극자의 방향을 수직으로 돌려줌으로써 쉽게 자극화 변환 이상을 유도할 수 있다.

• 한국화재소방학회논문지
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• 제26권5호
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• pp.1-7
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• 2012

현재 국내에서 수계소화설비의 배관부속류와 밸브류의 마찰손실 계산에 사용되고 있는 등가길이표에 대하여 비교 연구하였다. 3가지 종류의 등가길이표가 주로 사용되고 있으며 안타깝게도, 가장 광범위하게 사용되고 있는 등가길이표에 대한 근거를 찾을 수 없었다. 세 개의 등가길이표를 비교했을 때 각 등가길이표간 동일 항목의 등가길이에 있어 최대 2.4배까지 차이가 있었다. 많은 해외 Project들을 수행하고 있는 국제화시대에 부응할 수 있도록 공학적으로 합리적이며 단일화된 등가길이표를 사용하여야 한다. 이에 합리적인 등가길이표를 제시한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부A
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• pp.144-146
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• 1998

In this study Dead time equivalent resistance of Voltage source power converter is very important in current controller design. And Non-linear Modeling method can be applied in Power converter analysis. Using Describing Function method and Non-linear Resistance Modeling. Voltage Source Power Converter Bode diagram and Current controller analysis method are more reality.

• 전기학회논문지
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• 제62권7호
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• pp.1038-1044
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• 2013

A research on thermal analysis method is conducted for the characterization of heat generation during operation of Interior Permanent Magnet Synchronous Motor(IPMSM) for Light Railway Transits(LRT) in this paper. Efficient cooling of the heat generated in the IPMSM is important because the excessive heat generated from the winding, core and permanent magnet makes it harder for a long time continuous operation of IPMSM. Therefore, in order to analyze the heat generation characteristics of the 110kW-class IPMSM as advanced research for application the IPMSM to the cooling device, the heat transfer coefficients for each component of the 110 kW-class IPMSM were derived and the thermal equivalent network was configured to perform the thermal analysis in this study. Finally, the 110kW-class IPMSM prototype is made and a comparative verification between the test data and the thermal analysis results through its various performance tests are carried out.

• Journal of Power Electronics
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• 제12권2호
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• pp.317-325
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• 2012

Resonant immittance converter (RIC) topologies can transform a current source into a voltage source (Type-I RICs) and vice versa (Type-II RICs), thereby making them suitable for many power electronics applications. RICs are operated at a fixed frequency where the resonant immittance network (RIN) exhibits immittance conversion characteristics. It is observed that the low-frequency response of Type-II RINs is relatively flat and that the state variables associated with Type-II RINs affect the response only at the high frequencies in the vicinity of the switching frequency. The overall response of a Type-II RIC is thus dominated by the filter response, which is particularly important for the controller design. Therefore, an approximate equivalent circuit model and a small-signal model of Type-II RICs are proposed in this paper, neglecting the high-frequency response of Type-II RINs. While the proposed models greatly simplify and speed-up the analysis, it adequately predicts the open-loop transient and small-signal ac behavior of Type-II RICs. The validity of the proposed models is confirmed by comparisons of their results with those obtained from a cycle-by-cycle simulation and with an experimental prototype.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제51권7호
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• pp.331-338
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• 2002

An inverter-fed induction is driven by a harmonic voltage source so that it is necessary to be analysed by time-stepping F.E.M. But it takes so long time that disadvantageous to design. This paper presents a simple analysis method for inverter-fed induction motor using FEM and harmonic equivalent circuit. First, the rotor bar resistance and the leakage reactance are determinated by FEA for 1 slot region in rotor to consider the skin effect and the saturation. Secondly, the characteristic of the motor is analyzed by the harmonic equivalent circuits consisting of the obtained parameters from the FEA. This method is carried out to analyze an induction motor driven by the sinusoidal voltage and the inverter. The results are verified by comparing with those of the time-step F.E.A and the experiment.

• 한국지반환경공학회 논문집
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• 제13권12호
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• pp.43-49
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• 2012

건설공사장에서 사용하는 주요 건설장비에 대한 소음측정을 이격거리별로 수행하였다. 특히, 작업형태에 따라 변동하는 폭이 큰 건설장비에 대해서는 작업형태를 세분화하여 소음측정을 수행하였다. 무부하 및 작업이 이루어지는 시간 동안의 옥타브밴드별 'A'보정 등가소음도(Leq)를 측정하였다. 소음측정결과 대부분의 건설장비가 점음원의 특성과 유사하게 나타나고 있는 것으로 분석되었다.

• Journal of Electrical Engineering and Technology
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• 제12권2호
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• pp.522-532
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• 2017

In this study, we propose a fault analysis method for a power distribution grid with PCS-based DERs. We first explain the characteristics of a PCS-based DER. According to the characteristics, the DER is considered as a current-controlled voltage source, which produces varying voltages within a certain limit so that currents equal to given references flowing from the DER to the grid (currents controlled). So, we introduce the symmetrical equivalent models in the form of varying voltage source for fault analysis and then, construct a convex optimization problem to solve the fault problem associated with the equivalent models and grid conditions. Thus, the proposed method enables to perform a proper fault analysis considering the characteristics of the DER, which are currents controlled, voltage limited, and unity power factor achievement. To verify the validity of the proposed method, we perform computer simulations with the proposed method and with MATLAB Simulink, and the results are compared.