• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1224-1225
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• 2011

This paper proposes a novel soft-switching interleaved boost converter composed of two shunted elementary PFC boost conversion units and an auxiliary inductor. This converter is able to turn on both the active power switches at zero voltage to reduce their switching losses and evidently raise the conversion efficiency and power factor. Since the two parallel-operated elementary boost units are identical, operation analysis and design for the converter module becomes quite simple. A laboratory test circuit is built, and the circuit operation shows satisfactory agreement with the theoretical analysis. The performance of the proposed PFC rectifier was evaluated on an experimental 300[W] PFC prototype.

• Journal of Electrical Engineering and Technology
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• v.7 no.5
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• pp.736-744
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• 2012

In this paper, a battery charging system for Plug-in Hybrid Electric Vehicle (PHEV) and Electric Vehicle (EV), and operation algorithm of charging system are introduced. Also, the proposed charging system uses commercial electricity in order to charge the battery of parked PHEV and 48V battery charging system with power factor controllable single phase converter for PHEV is investigated in this paper. This research verifies the power factor control of input and the converter output controlled by the charge control algorithm through simulation and experiment.

• Proceedings of the KIPE Conference
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• 2000.07a
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• pp.605-609
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• 2000

This paper presents a development of the Pulse Width Modulation ASIC for control of the AC servo or spindle motor in machine tools. The ASIC is designed two PWM functions for simultaneous control of a converter and an inverter. Also the device includes additionally two UART functions for interfacing the RS232C with PC or other devices. The device is connected to the microprocessor of Intel or Motorola by bus interface. The required output voltage and frequency for the motor control is programmed to the PWM block and the corresponding switching signals are calculated and generated with regard to the programmed value.

• Proceedings of the KIPE Conference
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• 2002.07a
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• pp.769-772
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• 2002

본 논문에서는 직류 전기아크로의 전원장치로서 AC/DC 공진형 컨버터가 묘사된다. 또한 무효전력을 보상하기 위한 커패시터와 인덕터를 각각 직렬과 병렬로 연결되어 있다. 그러므로 무부하부터 단락회로까지의 범위에서 역률이 매우 높다. 이 컨버터는 직류 아크로의 전원장치로서 매우 적당하다.

• Proceedings of the KIPE Conference
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• 2005.07a
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• pp.113-115
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• 2005

본 연구는 저전압 교류 전류원으로부터 직류 부하에 에너지를 공급하기 위하여, 새로운 컨버터를 제안한다. 컨버터는 풀브리지 MOSFET 정류기와 플라이백 컨버터의 2단 구조로 구성되어 있으며, LC공진을 이용하여 AC/DC 전력변환을 수행한다. 컨버터 효율 개선을 위하여 컨버터 회로 내의 스위칭 소자는 3상한에서 동작한다. 제안된 컨버터의 동작원리 및 동작모드를 해석하고, 시뮬레이션을 통해 해석결과를 검증하였다.

• Proceedings of the KIPE Conference
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• 2014.07a
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• pp.463-464
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• 2014

본 논문은 LED 드라이버의 수명을 좌우하는 전해커패시터를 필름커패시터로 대체하기 위하여 출력맥동전류의 구형파 제어 방법을 제안한다. 출력맥동전류의 구형파 운전은 출력전류의 Peak to average ratio를 낮추어 출력커패시터의 용량을 감소시킬 수 있다. 일반적으로 전해커패시터의 1/20배의 용량 저감을 통하여 필름커패시터로 대체가 가능해진다. 본 논문에서 제안한 토폴로지는 bridgeless single-stage AC-DC LED드라이버의 구형파 전류제어에 따른 출력전류리플저감에 대한 내용을 다루었다.

• Proceedings of the KIPE Conference
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• 2015.11a
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• pp.111-112
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• 2015

MMC HVDC(Multi-level Modular Converter High Voltage Direct Current)는 현재 차세대 전력망으로써 각광을 받고 있고 그에 대한 연구가 활발하게 진행 중이다. 본 논문에서는 모듈형 멀티레벨 컨버터를 이용한 전압형 HVDC 시스템의 AC 전류제어기에 대하여 기술하고자 한다. 일반적으로 사용되는 회전변환을 통한 DQ전류제어와 PR제어를 사용하여 응답특성을 PSCAD/EMTDC를 통하여 비교 검증하고자 한다.

• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.430-432
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• 2019

본 논문에서는 ESS용 3상 AC/DC 컨버터 배터리 전류 제어 시 발생하는 문제에 대해 분석하고, 제안된 제어기의 유효성을 시뮬레이션을 통하여 입증한다.

• Proceedings of the KIPE Conference
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• 1997.07a
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• pp.393-399
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• 1997

Single-phase and three-phase AC to DC power converters are becoming frequently used for high voltage/high power applications such as telecommunications. They often require input/output transformer isolation for safety, a unity input power factor for minimum reactive power, free input harmonic currents fed back to the AC Power distribution system and, finally, high efficiency and high power density for minimum weight and volume. The proposed boost converter for power factor correction (PFC) provides an unity input power factor, low harmonic distortion and high efficiency along with reduced volume and weight. Single-phase 220VAC input/380VDC 1KW output prototype is constructed and experimental results will be verified with those of PSpice simulation.

• Proceedings of the KIPE Conference
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• 2004.07b
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• pp.704-708
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• 2004

Recently, many nation have released standard such as IEC 61000-3-2 and IEEE 59, which impose a limit on the harmonic current drawn by equipment connected to AC line in order to prevent the distortion of an AC Line. Therefore, Plasma Display Panel (PDP) which is highlightened in digital display device also has the Power Factor Correction (PFC) circuit to meet the harmonic requirements. In PDP power module, the conventional boost converter is usually used for the PFC circuit. However, it comes serious thermal problem on it's bridge diode due to heat of PDP, and therefore the system stability is not guaranteed. In this paper, the bridgeless boost converter, which is used for PFC circuit of the PDP power module, is designed and verified the possibility of the application in a practical product in a view of efficiency, component count, temperature and etc.