• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1151-1152
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• 2011

본 논문에서는 부스트-플라이백(Integrated Boost-Flyback Converter, IBFC) 직렬 연결 구조 컨버터의 동작 특성 해석 및 정확한 제어기 설계를 위한 개선된 모델링 방법을 제시한다. 주 스위치에 의해 IBFC의 부스트, 플라이백 컨버터가 서로 다른 도통 모드로 동시에 동작 하기 때문에 2대 컨버터의 모델링과 회로 해석을 위한 이론적인 모델링 접근방법과 수학적인 계산과정이 복잡하다. 따라서 IBFC를 등가 전류 소스를 포함한 부스트, 플라이백 컨버터로 각각 나누어 상태 공간 평균화 방법을 이용하여 회로 방정식을 독립적으로 유도한 후, 이 회로 방정식을 종합하여 IBFC의 완전한 상태 공간 방정식을 얻을 수 있다. 제안된 방법은 IBFC의 복잡한 모델링을 간단하게 해 주며, 수학적인 계산 과정도 간소화 시킬 수 있는 장점이 있다. 이를 바탕으로 정상 상태 해석 및 높은 출력 전압 추종 제어기를 설계하였다. 시뮬레이션과 실험 결과를 제시하여 제안된 방법의 유효함을 검증하였다.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.87-88
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• 2011

전기 자동차는 내연기관 차량을 대체할 차세대 그린카의 대표 차종으로 부각되고 있다. 전기 자동차가 상용화되기 위해서는 전기자동차 자체의 성능뿐만 아니라 충전 인프라 발전이 함께 이뤄져야 한다. 현재 개발된 전기 자동차의 경우 충전 시간이 긴 반면 주행 거리가 짧기 때문에 효용성이 크게 떨어진다. 따라서 충전 시간을 최대한 단축 시키기 위한 급속 충전 시스템 개발이 활발하게 진행되고 있다. 본 논문에서는 전기 자동차용 급속 충전기에 적용되는 실제적인 DC-DC 컨버터를 ATPDraw/MODELS를 이용해 모델링하고 검증하였다.

• Proceedings of the KIPE Conference
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• 2000.07a
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• pp.670-673
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• 2000

This paper describes a new inverter active inverter between a photovoltaic(PV) array and single-phase utility that avoid the bulky input(60Hz) transformer on the AC side. The interface employs a pwm boost converter on the DC side followed by a pwm boost converter on the DC side followed by a pwm current-forced single-phase rectifier for injecting the power from the PV array into the mains. The current waveform at the AC side remains sinusoidal and exactly in phase at all time. The circuit also has the advantage of requiring fewer switching device than high-frequency link system. This paper describes modeling of PV array and new system topology. Simulation results on the performance of the connection are also presented.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.27 no.12
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• pp.114-124
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• 2013

Recently, the real time simulator to develop the inverter drive board and motor control algorithm for high power induction motor and PM synchronous motor is required. In this paper, the real time simulator based on the voltage control for a PM synchronous motor is proposed. The resistor, inductor, and the induced voltage for the modeling of a PM synchronous motor is implemented by the power converter including the LCL filter and the PWM rectifier. The induced voltage of a PM synchronous motor is simulated by the capacitor voltage of the LCL filter, which is controlled by PI voltage controller and the deadbeat current controller. The operation and the simulated characteristics of the proposed real time simulator for a PM synchronous motor is verified by the simulation.

• Proceedings of the KIPE Conference
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• 2008.06a
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• pp.231-233
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• 2008

본 논문은 전류경계영역(Boundary Conduction Mode:BCM) 역률개선(Power Factor Correction:PFC) 플라이백 Converter의 전류 대신호 모델을 제시하였다. 역률개선 플라이백 Converter의 Small Signal Model을 확립하였으며, 60W급 전원회로의 구현을 통해 제안된 모델링의 유용성을 검증하였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.18 no.4
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• pp.509-518
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• 1993

Protocol conversion is to resolve the imcompatibility between networks so that users on different protocols can communicate with each other. This paper designs a formal model, EPN , to increase its modeling power and analyze conversion protocol and proposes a conversion algorithm using it. The conversion algorithm has two capabilities : synchronization and automatic error recovery function. Therefore burden of protocol converter design will be reduced, automatic protocol converter design can be possible and implementation for half-gateway will be easy.

• Proceedings of the KIEE Conference
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• 1999.07f
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• pp.2712-2714
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• 1999

The small signal model for input series-output parallel connected converter system employing charge control together with input capacitor voltage feedback loop is developed. From the model developed, the effect of input capacitor voltage feedback loop to the system stability and outer loop compensator design is analyzed. Theoretical results and simulation show that input capacitor voltage feedback loop has no critical effects on the system stability, so the system can be reduced to a equivalent single module for the stability analysis and outer loop compensator design.

• Proceedings of the KIEE Conference
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• 1999.07f
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• pp.2682-2684
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• 1999

This paper presents design and stability analysis of the constant frequency Flyback type converter using average current-mode control. The average current-mode control has been recently reported, and superior characteristics over a peak current-mode control such as a good tracking performance of an average current, no slope compensation and noise immunity. By the improvement of PM(Phase Margin) obt from applying the compensator in the current loop, the stability of designed flyback convert more improved. The validity of designed convert confirmed by simulation and experimental result

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2003.04a
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• pp.305-312
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• 2003

Recently, with a progressive development of hardware of computer, the internet and network technology, the environment of construction varies rapidly due to increase the complex form in structure shape and system. With variations, the CAD system for design and products also varies from 2D system to 3D system. This study mainly deals with the methodology of automatic connection design of 3D CAD system, steel connection system (XSteel) using macro. First, using design program in the steel connection system, Xsteel, the joint connection macro will be made up and established the detail classes of design. The next, Database Program (Converter Program) related to the general structural analysis program (MIDAS) and the steel connection program (Xsteel) is constructed for data interface between two programs. From this study, if the merits of 3D CAD system and converter program are utilized well, it is expected that the time needed in modeling and the amounts due to material loses decrease gradually.

• Proceedings of the KIEE Conference
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• 1997.11a
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• pp.463-465
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• 1997

For fast response of the dc output voltage in PWM converter, the relationship of power balance of both the input and output should be introduced to the system modeling. Then, a nonlinear control theory using state feedback linearization is useful to control the system. By nonlinear control, the voltage response can be fast, so the size of the output filter capacitor can be reduced as long as the same response is kept. The validity of the proposed scheme is shown from the simulation results.