• Proceedings of the KIPE Conference
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• 2012.11a
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• pp.44-45
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• 2012

본 논문에서는 전류 증배 정류회로를 이용한 능동 클램프 포워드 컨버터의 정상상태를 분석한다. 기존 분석들 대비 변압기의 누설 인덕턴스와 전류 증배 정류회로에서의 전류 불균형 현상을 고려하여 회로 동작의 정확한 이해를 도모한다. 분석 결과의 타당성은 100W급 (3.3-V/30.3-A) 모의 실험을 통해 검증한다.

• Proceedings of the KIPE Conference
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• 2010.07a
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• pp.148-149
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• 2010

본 논문에서는 친환경 차량용 보조배터리 충 방전을 위한 3상 양방향 DC-DC컨버터를 제안한다. 제안한 컨버터는 클램프 스위치의 동작으로 전압 및 전류공진을 최소화하고 대전류단의 순환전류를 감소시켜 전류정격을 줄였다. 제안하는 컨버터의 이론적 해석과 시뮬레이션을 통해 타당성을 검증하였다.

• Proceedings of the KIPE Conference
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• 2010.07a
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• pp.150-151
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• 2010

본 논문에서는 5kW급 연료전지 응용을 위한 3상 DC-DC 컨버터를 제안한다. 제안한 컨버터의 Delta-Wye 결선은 전압형의 가장 큰 단점인 변압기 턴비를 최소화 하였으며 클램프 스위치의 동작으로 전압 및 전류 공진을 감소시키고 순환전류를 리셋시켜 각 소자들의 전류정격을 줄였다. 기존 3상 Full-Bridge와 비교 분석을 수행하였으며 시뮬레이션을 통해 타당성을 검증하였다.

• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.130-132
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• 2019

본 논문에서는 위상 천이 풀 브릿지 컨버터와 공진형 하프 브릿지 컨버터를 통합한 구조에서 새로운 센터탭 클램프 회로를 적용하였다. 하프 브릿지 컨버터가 통합되어 있는 구조를 통하여 기존 위상 천이 풀 브릿지 컨버터가 가지고 있는 여러 단점을 개선할 수 있으며, 또한 제안하는 클램프 회로를 통해 이차측 전압 스트레스 및 출력 커패시터의 사이즈 측면에서 개선점을 갖는다. 이러한 장점들을 통해 효율과 비용 측면에서 큰 효과를 갖는다. 3.3 kW 의 프로토타입을 통해 실험으로 검증하였다.

• Journal of Navigation and Port Research
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• v.30 no.8 s.114
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• pp.685-690
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• 2006

The rail clamp is the device to prevent that a crane slips along rails due to the wind blast as well as to locate the crane in the set position for loading and unloading containers. The wedge typed rail clamp should be designed to consider the structural stability and the durability because it compresses both rail side with large clamping force by the wedge working as the wind speed increases. In this research, the design of experiments(DOE) and the variation technology(VT) built in ANSYS WORKBENCH are utilized to determine the optimum shape of a jaw. The optimum results obtained by two methods are compared and examined.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.24 no.5
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• pp.136-144
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• 2010

This paper presents the two-switch interleaved active clamp forward converter, which is mainly composed of two active clamp forward converters. Only two switches are required, and each one is the auxiliary switch for the other. So, the circuit complexity and cost are reduced and control is more simple. An additional resonant inductance is employed to achieve ZVS(Zero-Voltage-Switching) during the dead times. Interleaved output inductor currents diminish the voltage and current ripple. Accordingly, the smaller output filter and capacitors lower the converter volume. This research proposed the Two-switch interleaved Active Clamp Forward Converter characteristic. The principle of operation, feature and design considerations is illustrated and the validity of verified through the experiment with a 160[W] based experimental circuit.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• v.1
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• pp.357-362
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• 2006

The wedge type rail clamp compresses with small clamping force at first, and with large clamping force when the wind speed increases because of the wedge working. At this time in order to display the wedge working, the rail clamp slips along a rail. If the supporter is not installed in the rail clamp when the wind speed increases more and more, the structure will occur overload which leads the structure to fracture. So the supporter has to be installed in the rail clamp. The proper position of this supporter is determined by the initial clamping force and the wege angle. Therefore in this study we adopted 5-kinds of wedge angle as the design parameters, and carried out the finite element analysis, in order to analyze the relationship between the initial clamping force and the proper position of supporter in the wedge type rail clamp.

• Journal of Navigation and Port Research
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• v.31 no.1 s.117
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• pp.65-70
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• 2007

The wedge type rail clamp compresses with small clamping force at first, and with large clamping force when the wind speed increases bemuse of the wedge working. At this time in order to display the wedge working, the rail clamp slips along a rail. If the supporter is not installed in the rail clamp when the wind speed increases more and more, the structure will occur overload which leads the structure to fracture. So the supporter has to be installed in the rail clamp. The proper position of this supporter is determined by the initial clamping force and the wege angle. Therefore in this study we adopted 5-kinds of wedge angle as the design parameters, and carried out the finite element analysis, in order to analyze the relationship between the initial clamping force and the position of supporter in the wedge type rail clamp.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2006.06b
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• pp.331-336
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• 2006

The rail clamp is the device to prevent that a crane slips along rails due to the wind blast as well as to locate the crane in the set position for loading and unloading containers. The wedge type rail clamp should be designed to consider the structural instability and the durability because it compresses both rail side with large clamping force by the wedge working as the wind speed increases. In this research, there are two methods which are design of experiment and variation technology in used commercial software and shape optimization was performed. The optimum results obtained by the two methods are compared and examined.

• Journal of the Korean Society for Nondestructive Testing
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• v.31 no.2
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• pp.118-126
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• 2011

The characteristics of the responses obtained in thermosonic tests are investigated in this study to improve the performance of a thermosonic test system. Thermosonic tests are conducted with an acoustic horn with high power capability to investigate the characteristics of the vibration produced in turbine blades with complex geometry. The influences of the excitation signal that is input to the horn and the coupling methods between a clamp and the acoustic horn on the characteristics of the vibration excited in a component are presented. As a result, an excitation method with a fast narrow band chirp test (sweep test) and a stud coupling is proposed as an excitation method for thermosonic testing. This method can be applied to different types of turbine blades and also to other components.