• Proceedings of the KIPE Conference
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• 2020.08a
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• pp.431-432
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• 2020

철도차량 하부에 부착되는 전장품 무게는 차량의 바퀴 및 베어링 등 철도차량 수명에 큰 영향을 주기 때문에 경량화는 필수적이다. 본 논문에서는 철도 차량용 보조전원장치의 경량화를 위해 LLC 공진형 컨버터를 적용한 보조전원장치 시스템과 제어알고리즘을 제안한다. 제안하는 알고리즘은 고속스위칭을 위해 입력단 벅 컨버터를 이용하여 가선 전압을 감압시키고 이후 LLC 공진형 컨버터를 통해 인버터 입력단 전압을 제어한다. 또한, 공진형 컨버터 손실을 최소화하기 위해 ZVS(Zero Voltage Switching) 동작을 하며, 공진 탱크의 최적 설계도 제안한다. 본 논문에서 제안하는 알고리즘은 시뮬레이션 및 실험으로 검증한다.

• The Transactions of the Korean Institute of Power Electronics
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• v.2 no.2
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• pp.19-28
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• 1997

A simple AC complex circuit analysis for LCL type series resonant converter with phase shift control is proposed. Based on these analyses, a set of characteristic curves which allows a optimal design procedure for this converter is shown, without increasing the volt-ampere rating of tank circuit. Especially, inverter output peak current can be minimized in both full load and partial load conditions. The presented design considerations can make the load range wide from full loads to light loads achieving turn-on with zero voltage switching (ZVS) operation. The simulation and experimental results show the effectiveness of the proposed design algorithms.

• Proceedings of the KIEE Conference
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• 1999.07f
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• pp.2698-2700
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• 1999

The MRC minimizes a parasitic oscillation using the resonant tank circuit absorbed parasitic reactances existing in a converter circuit. So the converter is capable of operating at a high switching and also reducing the losses. But the resonant voltage stress across a resonant switch is 4-5 times a input voltage. This high voltage stress increases the conduction loss in MOSFET. In this paper, the CM forward MRC with synchronous rectifier and AT forward MRC are compared about efficiency and semiconductor stress. For analysis, we have built a 50W CM forward MRC and a 50W AT forward MRC. in which the input voltage is 48V, output voltage is 5V, each other. The measured voltage stress is about 170V of 2.9 times the input voltage in the AT Forward MRC, about 106V of 1.8 times the input voltage in CM forward MRC, and the efficiency is 81.05% in AT Forward MRC, 83.61% in CM forward MRC.

• Proceedings of the KIPE Conference
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• 2009.11a
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• pp.237-239
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• 2009

This paper presents a new developed 160kV-120kW Class MPC (magnetic pulse compressor) power supply for DeNOx, DeSOx system. The circuit consists of N-series connected CCPS (capacitor charging power supply) and MPC Tank. The MPC power supply developed compared to the conventional LC resonant type has many advantage, it was verified reliability of a product by module, simulator and tank connection test. Now, the developed MPC power supply is installed POSCO sintering plant for DeSOx, DeNOx system.

• Proceedings of the KIEE Conference
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• 1992.07b
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• pp.1154-1157
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• 1992

This paper presents a study on the current control method of the cycloconverters with high frequency LC resonant tank circuits for induction heating. The current control algorithms of the cycloconverters are proposed. Since the current waveforms of the cycloconverters have ripple, we proposed the compansation methods for that effects. And the performance of the current control system is considered with the results of the simulation by using the proposed current control algorithms.

• Journal of Industrial Technology
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• v.28 no.B
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• pp.117-122
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• 2008

This paper presents the conductance model at high frequency of the Ceramic Metal Halide Lamp and the designing method of the electronic ballast with the LCC resonant tank type by using that model. Conductance model is based on a physical phenomenon in the discharge tube of the lamp and model constants of conductance model are obtained by Least Squares Method. After equivalent impedances are determined by the conductance model, The LCC resonance tank is designed by using the equation of the lamp power. Simulation result using PSpice software and experimental results show that the conductance model in this paper is very useful to design the electronic ballast at high frequency for the Ceramic Metal Halide Lamps.

• International Journal of Naval Architecture and Ocean Engineering
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• v.12 no.1
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• pp.178-183
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• 2020

A series of experiments covering lowest three natural frequencies of rolling coupled pitching were conducted to investigate liquid sloshing with low liquid depth. The test results show that the most violent liquid sloshing in rolling and pitching is located in the vicinity of the first order natural frequency (f1). When the excitation frequency of rolling and pitching is located between 0.98f1 and 1.113f1, roof-bursting phenomenon of liquid appeared, and the maximum impact pressure is at 1.09f1. When the external excitation frequency is at 1.113f1, the number of sloshing shocks decreases sharply. Furthermore, the space distribution of the impact pressure on the left bulkhead and the top bulkhead was analyzed. It is concluded that with low liquid filling, the impact load is greater near the free surface and the top of tank, and the impact position of the side bulkhead increases with the increasing of the frequency near the resonant frequency.

• Ocean Systems Engineering
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• v.11 no.4
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• pp.353-371
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• 2021

Sloshing behavior of liquid within containers represents one of the most fundamental fluid-structure interactions. Liquid in partially filled tanks tends to slosh when subjected to external disturbances. Sloshing is a vicious resonant fluid motion in a moving tank. To understand the effect of baffle positioned at L/3 and 2L/3 location, a shake table experiments was conducted for different fill volumes of aspect ratio 0.163, 0.325 and 0.488. For a fixed amplitude of 7.5 mm, the excitation frequencies are varied between 0.457 Hz to 1.976 Hz. Wave probes have been located at both tank ends to capture the surface elevation. The experimental parameters such as sloshing oscillation and energy dissipation are discussed here. Comparison is done for with baffles and without baffles conditions. For both conditions, the results showed that aspect ratio of 0.163 gives better surface elevation and energy dissipation than obtained for aspect ratio 0.325 and 0.488. Good agreement is observed when numerical analysis is compared with the experiments results.

• Proceedings of the KIPE Conference
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• 2009.11a
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• pp.215-218
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• 2009

• Proceedings of the KIPE Conference
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• 2012.11a
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• pp.48-49
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• 2012

본 논문에서는 공진탱크를 이용하여 고승압을 성취할 수 있는 새로운 비절연 컨버터를 제안한다. 제안한 컨버터는 병렬 공진탱크를 이용하여 고승압을 달성하며 스위치의 ZVS 턴온 및 다이오드의 ZCS 턴오프를 성취하고 스위치의 전압정격이 출력전압보다 낮은 장점이 있다. 제안하는 컨버터의 동작원리를 제시하고 250W급 실험을 통하여 타당성을 검증하였다.