• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.187-190
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• 2002

Plasma Display Panel(PDP) has been recognized as one of the most competitive display panel. Hence, the importance of PDP driving circuit is getting higher and higher. At the same time, it is strongly required for the driving circuit to be high efficiency, high stability, and cost effective one. In this work, a stable PDP driving circuit is developed by improving the circuit configuration. And the reliability and the productivity of the driving circuit are improved by using the Intelligent Power Module(IPM) technology. Finally operating characteristics of the developed IPM driving circuit are verified by using signal source board developed.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
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• pp.208-211
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• 2001

This paper proposes a novel flyback topology and its control scheme, where some disadvantages of the conventional one are eliminated while the circuit simplicity is maintained, and furthermore confirms the improvement of its dynamic response and stability analytically and experimentally.

• 전기학회논문지
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• 제67권8호
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• pp.994-1001
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• 2018

In this paper, to studied about future power system construction using PSS / E-Python API. Python-based future system automatical construction methods and modeling of renewable sources. it confirmed the stability of the powert system for each renewable area by calculating the weighted short circuit ratio (WSCR) index. it calculated the short circuit ratio (SCR) and selected the transmission line linkage scenario to improve the stability of vulnerable areas. it confirmed the WSCR index improvement through the selected transmission line linkage of scenario, and analyzed the stability of the renewable power system applying the scenario. It describes Facts and Shunt devices adjustment for the load flow convergence. It describes the stable methed of the bus voltage through the transformer Ratio Tap adjustment. By performing PSS/E ASCC using the Python it was performed three-phase short circuit fault capacity analysis, it is confirmed whether excess of the fault current circuit breaker capacity. In order to contingency accident analysis, it have described the generation of one or two line list of each areas using the Python. The list is used to contingency analysis and describe the soluted of the transmission line overload through comparison before and after adding the scenario line.

• 대한전자공학회논문지
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• 제27권2호
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• pp.111-117
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• 1990

본 논문에서는 스위칭 레귤레이터의 한 형태인 승강압형 DC-DC 콘버어터에 있어서 전달함수의 우반면에 존재하는 영점이 안정성에 대하여 미치는 영향을 고찰하였고, 출력전류의 변화에 대한 안정범위를 궤한이득을 통하여 구하였다. 이 결과로부터, 우반면에 영점이 존재하기 때문에 안정성이 저하됨을 알 수 있었다. 궤한제어회로에 극 보상을 하였고, 이경우 유효한 안정성의 범위를 이득대역폭적과 관련지어 구하였으며 실험을 통하여 이를 입증하였다.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 1994년도 특별강연 및 추계학술발표 개요집
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• pp.93-95
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• 1994

• 한국전자파학회논문지
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• 제17권10호
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• pp.929-934
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• 2006

본 논문에서는 조건 안정 증폭기 설계를 위한 안정도 여유 분석 과정을 소개하고, 분포형 DC 차단 회로와 임피던스 정합 회로의 기능을 동시에 갖는 용량성 결합 정합 회로(CCMC)에 대해 기존 연구 결과보다 간단화된 설계 방법을 제안하였다. 조건 안정 마이크로파 증폭기 설계에 있어, 안정도 여유 분석에 근거한 접근법은 정량적으로 분석된 안정도 여유도에 근거하여 최대 이득 정합 조건을 결정하는데 유용하게 사용된다. 이러한 설계 방법은 조건 안정 상태에서 정합점 결정 시 반복적인 시행 착오를 줄일 수 있는 장점이 있다. 또한, 논문에서 제안하는 CCMC 설계 기법은 정합 회로의 구조를 정형화시킴으로써 기존 방법에 비해 합성 변수가 적은 장점이 있다. 제안 방법의 검증을 위해 박막 공정으로 제작된 24 GHz조건 안정 증폭기는 대역 평탄도 1 dB, 소신호 이득 10 dB로 설계 값과 잘 부합하는 결과를 보였다.

• 한국표면공학회지
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• 제55권2호
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• pp.102-119
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• 2022

Gold plating is used as a coating of connecter in printed circuit boards, ceramic integrated circuit packages, semiconductor devices and so on, because the film has excellent electric conductivity, solderability and chemical properties such as durability to acid and other chemicals. As increasing the demand for miniaturization of printed circuit boards and downsizing of electronic devices, several types of electroless gold plating solutions have been developed. Most of these conventional gold plating solutions contain cyanide compounds as a complexing agent. The gold film obtained from such baths usually satisfies the requirements for electronic parts mentioned above. However, cyanide bath is highly toxic and it always has some possibility to cause serious problems in working environment or other administrative aspects. The object of this investigation was to develop a cyanide-free electroless gold plating process that assures the high stability of the solution and gives the excellent solderability of the deposited film. The investigation reported herein is intended to establish plating bath composition and plating conditions for electroless gold plating, with thiomalic acid as a complexing agent. At the same time, we have investigated the solution stability against nickel ion and pull strength of solder ball. Furthermore, by examining the characteristics of the plated Au plating film, the problems of the newly developed electroless Au plating solution were improved and the applicability to various industrial fields was examined. New type electroless gold-plating bath which containing thiomalic acid as a complexing agent showing so good solution stability and film properties as cyanide bath. And this bath shows the excellent stability even if the dissolved nickel ion was added from under coated nickel film, which can be used at the neutral pH range.

• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2007년도 학술대회
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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.

• Journal of Power Electronics
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• 제18권3호
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• pp.902-909
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• 2018

This study investigates the influences of different core parameters on the dynamic performances, such as rise time and overshoot, in pulse transformers for the triggering circuit of SCRs. First, a simplified transformer equivalent circuit, which emerges from a standard transformer equivalent circuit, is developed to analyze the step response. Second, the relations between the dynamic performances and the parasitic parameters are calculated by the simplified equivalent circuit. Third, the variations of rise time and overshoot, which are vital to the stability of triggering SCRs, with different core parameters, such as mechanic dimensions and topologies, are comprehensively investigated by analyzing the parasitic parameters. Finally, prototype transformers are fabricated to experimentally validate the analysis. The presented method can practically instruct the design of a pulse transformer for triggering SCRs.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.271-273
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• 2002

Switching power supply are widely used in many industrial field. Power factor correction(PFC) has become an increasingly necessary feature in new power supply designs. The power factor correction circuit using boost converter used in input of power source is studied in this paper. In a boost power factor correction circuit there are two feedback control loops, which are a current feedback loop and a voltage feedback loop. In this paper, it is analyzed regulation performance of output voltage and compensator to improve of transient response that presented at continuous conduction mode(CCM) of boost PFC circuit. The validity of designed boost PFC circuit is confirmed by simulation and experimental results.