• Proceedings of the KIEE Conference
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• 1996.11a
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• pp.367-369
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• 1996

This paper proposed that a buck type AC-DC Converter for high power factor operates with four chopper connecting a number of parallel circuit. And, some simulative results on computer is included to confirm the validity of the analytical results.

• Proceedings of the KIPE Conference
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• 2008.10a
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• pp.218-220
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• 2008

This paper describes buck converter's MOSFET driver for high-brightness LED strings. The power driving high-side MOSFET is supplied from the power source of control circuit part. The practical considerations and future work are also described.

• Proceedings of the KIPE Conference
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• 2014.07a
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• pp.142-143
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• 2014

본 논문에서는 Buck type의 단상 AC/AC 초퍼를 이용한 단상 voltage sag compensator를 제안한다. 제안된 회로는 sag보상 동작 시 사용된 변압기의 누설리액턴스가 단상 PWM Buck AC/AC converter에 미치는 영향이 작아 동작효율이 높고, sag가 발생하지 않는 상태일 때 입력과 출력이 절연되는 장점이 있다. 본 논문에서는 제안된 회로의 동작 및 특성을 설명하고, 타당성을 입증하기 위해 PSIM으로 시뮬레이션 하였다.

• Proceedings of the KIPE Conference
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• 2014.07a
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• pp.393-394
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• 2014

This paper proposes advanced RFB PCS for islanded environment. To accommodate islanded system, power conditioning needs voltage control authority changing. Dualbuck inverter topology is designed for the high efficiency. In order to reduce voltage error the repetitive controller is used in this paper. The control performance has been verified with computer simulation.

• Proceedings of the KIPE Conference
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• 2014.07a
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• pp.144-145
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• 2014

본 논문에서는 Buck type의 3상 AC/AC 초퍼를 이용한 3상 voltage sag compensator를 제안한다. 제안된 회로는 sag보상 동작 시 사용된 변압기의 누설리액턴스가 3상 PWM Buck AC/AC converter에 미치는 영향이 작아 동작효율이 높고, sag가 발생하지 않은 상태일 때 입력과 출력이 절연되는 장점이 있다. 본 논문에서는 제안된 회로의 동작 및 특성을 설명하고, 타당성을 입증하기 위해 PSIM으로 시뮬레이션 하였다.

• Proceedings of the KIPE Conference
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• 2015.11a
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• pp.133-134
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• 2015

본 논문은 배터리 시뮬레이터용 양방향 DC-DC 컨버터에서 스위칭 주파수를 조절하여 넓은 출력 전압 범위에서 출력을 향상시킴을 보였다. 전 부하 영역에서 ZVS를 구현하였고, Psim 시뮬레이션을 통해 검증하였다.

• YAKHAK HOEJI
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• v.13 no.2_3
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• pp.76-79
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• 1969

A colorless needle crystlline substance, m.p. 170-$171^{\circ}C$ was obtained from the bark of Firmiana platanifolia in 4% yield. The acetylation derivative of this compound shows m.p. 163--$164^{\circ}C$. Through pharmacological screening tests, it was found that the original substance has an augmented contractility for isolated frog muscle in doses of 2.5$\times$10$^{-4}$ - 1$\times$10$^{-3}$g/ml.

• JOURNAL OF ELECTRICAL WORLD
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• s.244
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• pp.17-23
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• 1997

• JOURNAL OF ELECTRICAL WORLD
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• s.245
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• pp.36-44
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• 1997

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.49 no.8
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• pp.35-40
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• 2012

In DC-DC converters, a PWM/PFM dual mode control method is commonly used to maintain a high efficiency over a wide range of load variation. Since the control mode is selected according to the load condition, the chip area is increased due to additional circuit for mode control and the optimum efficiency cannot be achieved around the mode transition point. To solve such problems, a new integrated control method is proposed in this paper, in which a PLL is used in the current mode PWM control circuit instead of an oscillator. The proposed integrated control method is verified through a design of a buck converter using PSIM simulation. Simulation of the complete buck converter circuit by Cadence Spectre showed a maximum efficiency of 94.7% at a load current of 250mA and an efficiency of 85.4% at a load current of 10mA under the light load condition.