• 전력전자학회논문지
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• 제22권6호
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• pp.496-503
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• 2017

This study proposes a high-performance current control algorithm for a diode-bridge-type single-phase boost power factor correction (PFC) converter. The conventional asynchronous single-phase current controllers that directly control AC-type current tend to be accompanied by steady-state errors due to their poor dynamic characteristics for the transient-state, which can be attributed to bandwidth limitations and phase delays. In the proposed algorithm, an ideal current control with minimal phase delays and steady-state errors can be achieved by using a virtual DQ synchronous reference frame and by controlling the synchronous reference frame excluding the frequency component in the single-phase system. The performance of the conventional asynchronous single-phase current controller is compared with that of the proposed algorithm through simulation and experiments, and the results have confirmed the superiority of the latter.

• 한국컴퓨터정보학회논문지
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• 제29권6호
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• pp.143-151
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• 2024

본 논문은 부스트 PFC (Power Factor Correction) 컨버터의 경부하시, 컨버터의 인덕터 전류 왜곡을 수학적으로 분석하고 원인을 정의한다. 경부하시 평균 전류 모드제어에서 인덕터 전류가 불연속적으로 도통하게 되어 부정확한 인덕터 전류 평균값이 전류 제어에 반영된다. 예측 전류 모드제어에서는 인덕터 전류에 비해 전류 리플이 상대적으로 커져 전류 왜곡이 심해진다. 또한 모델 예측 전류제어의 경우 인덕터 전류의 첨두치 부근에서 스위치가 OFF된다. 인덕터 전류 왜곡은 total harmonic distortion 증가와 역률 감소를 유발하기 때문에 반드시 해결되어야 한다. 본 논문은 수학적 분석을 기반으로 부스트 PFC 컨버터의 경부하시 전류 왜곡을 완화할 수 있는 설계 절차를 선정한다. 마지막으로 hardware-in-the-loop simulation을 사용하여 경부하시 제어 방법들을 비교분석했다.

• Journal of Power Electronics
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• 제12권5호
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• pp.689-698
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• 2012

This paper investigates the effects of applying different input current waveshapes on the performance of a continuous-conduction-mode (CCM) power-factor-correction (PFC) boost pre-regulator. It is found that the output voltage ripple of the pre-regulator can be reduced if the input current is modified to include controlled amount of higher order harmonics. This finding allows us to balance the performance of output regulation and the harmonic current emission when coming to the design of the pre-regulator. An experimental PFC boost pre-regulator prototype is constructed to verify the analysis and show the benefit of the pre-regulator operating with input current containing higher order harmonics.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.166-168
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• 2004

Conventional Switched Mode Power Supplies(SMPS) with diode-capacitor rectifier have distorted input current waveform with high harmonic order contents. Typically, these SMPS have a power factor lower than 0,7. To improve with this problem the power factor correction(PFC) circuit of power supplies has to be introduced. Specially, to the reduce size and manufacture cost of power conversion device, the single-stage PFC converter is increased to demand as necessary of study. In this paper, comparative analysis of Valley-fill, boost and feedforward type single stage power factor correction circuit based on the flyback converter is given. Also, the validity of designed three type of single stage PFC circuit are confirmed by simulation and experimental results.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 B
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• pp.1244-1246
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• 2003

Conventional Switched Mode Power Supplies(SMPS) with diode-capacitor rectifier have distorted input current waveform with high harmonic content. Typically, these SMPS have a power factor lower than 0.65. To improve with this problem. the power factor correction(PFC) circuit of power supplies has to be introduced. Specially, to reduce size and manufacture cost of power conversion device, the single-stage PFC converter is increased to demand as necessary of study. In this case single-stage PFC converter has been used DC-DC converter with boost converter. However in this paper, it is studied flyback converter of high power factor, high efficiency by feedforward control. Also, the validity of designed and manufactured high power factor flyback converter is confirmed by simulation and experimental results.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 1999년도 학술대회논문집-국제 전기방전 및 플라즈마 심포지엄 Proceedings of 1999 KIIEE Annual Conference-International Symposium of Electrical Discharge and Plasma
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• pp.273-278
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• 1999

This paper presents a novel Power Factor Corrected(PFC) single-stage AC/DC Half-Bridge converter, which features discontinuous conduction mode(DCM) and soft-switching. The reduced conduction losses are achieved by the employment of a novel power factor correction circuitry, instead of the conventional configuration composed of a front-end rectifier followed by a boost converter. To identify the validity of the proposed converter, simulated results of 500[W] converter with 100[V] input voltage and 50[V] output voltage are presented.

• 전력전자학회논문지
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• 제18권5호
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• pp.458-465
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• 2013

This paper proposes a novel soft-switched auxiliary resonant circuit to provide a Zero-Voltage-Transition at turn-on for a conventional PWM boost converter in a PFC application. The proposed auxiliary circuit enables a main switch of the boost converter to turn on under a zero voltage switching condition and simultaneously achieves both soft-switched turn-on and turn-off. Moreover, for the purpose of an intelligent multi-chip power module fabrication, the proposed circuit is designed to satisfy several design constraints including space saving, low cost, and easy fabrication. As a result, the circuit is easily realized by a low rated MOSFET and a small inductor. Detail operation and the circuit waveform are theoretically explained and then simulation and experimental results are provided based on a 1.8 kW prototype PFC converter in order to verify the effectiveness of the proposed circuit.

• 전력전자학회논문지
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• 제10권3호
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• pp.226-232
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• 2005

최근 많은 나라들이 상용전원의 왜곡을 방지하기 위해 AC 라인에 직접 연결하는 제품에 IEC 61000-3-2 나 IEEE 59 와 같은 고조파 규제를 가하고 있다. 따라서 최근 차세대 디스플레이 소자로 각광을 받고 있는 PDP(플라즈마 디스플레이 패널) 역시 이런 규제치를 만족하기 위해 역률개선회로를 부착하고 있다. 기존의 PDP 파워 모듈에서는 일반적으로 잘 알려진 부스트 컨버터를 이용해 역률개선회로를 구성하여 사용하였다. 그러나 PDP 자체의 열과 브리지 다이오드의 과도한 발열 때문에 시스템의 안전성을 보장할 수가 없었다. 본 논문에서는 PDP 파워 모듈용 역률개선회로로 브리지 없는 부스트 컨버터를 이용함으로써 효율, 소자 수, 발열상태 등 여러 가지 측면에서 기존회로와 비교 분석을 하고 그것의 제품 적용 가능성을 살펴보고자 한다.

• Journal of Power Electronics
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• 제13권2호
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• pp.206-213
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• 2013

In this paper, an improved passive snubber is investigated in a single-phase single-stage full-bridge boost power factor correction (PFC) converter, by which the voltage spike across primary side of the power transformer can be suppressed and the absorbed energy can be transferred to the output side. When compared with the basic passive snubber, the two single-inductors are replaced by a coupled-inductor in the improved snubber. As a result, synchronous resonances in the snubber can be achieved, which can avoid the unbalance of the voltage and current in the snubber. The operational principle of the improved passive snubber is analyzed in detail based on a single-phase PFC converter, and the design considerations of both the snubber and the coupled-inductor are given. Finally, a laboratory-made prototype is built, and the experimental results verify the feasibility of the proposed method and the validity of the theoretical analysis and design method.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2002년도 전력전자학술대회 논문집
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• pp.781-783
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• 2002

In this paper, the experiment results of the Boost converter for PFC(power factor correction) are presented. The performance of the 1kW class PFC rectifier with the average current mode control are evaluated. A 1kW, 100kHz system prototype was built and experimental results are presented to verify the design. As a results, power conversion efficiency above $95\%$ and power factor above $99\%$ were obtained.