• 전력전자학회:학술대회논문집
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• 전력전자학회 2017년도 전력전자학술대회
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• pp.359-360
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• 2017

This paper presents comparison of simulation and experiment in thermal analysis of 3-level PFC. Thermal analysis is necessary to optimize the power conversion system to get higher efficiency. Accordingly, analysis via simulation tools and analytic methods is performed to predict the power losses of converter. Consequently, thermal results of 3-level PFC experiment is compared with thermal analysis.

• 조명전기설비학회논문지
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• 제18권4호
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• pp.41-48
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• 2004

이 논문에서 정 전압형 PFC 전자식 안정기에 대하여 제안하였다. 제안하는 PFC 전자식 안정기는 고효율 승압형 컨버터와 기존의 하프브리지 인버터를 조합한 것이다. 제안된 PFC 전자식 안정기는 전압 분압기와 소프트 스위칭기술을 사용하여 입력전류의 왜형과 입력전류의 고조파가 감소됨을 증명하였다. 형광램프에 대한 시뮬레이션결과는 이론적인 분석과 일치함을 나타내었다.

• 전력전자학회논문지
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• 제8권5호
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• pp.455-462
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• 2003

스위칭 PFC 컨버터는 전력의 질을 향상시킬 뿐 아니라 최대 효율을 얻기 위해 널리 사용된다. 하지만, 스위칭 PFC 컨버터는 심각한 EMI 문제를 발생시킨다. 본 논문에서는 이 문제를 해결하기 위해서 APW 기법과 RPWM 기법을 PFC Boost 컨버터에 적용하여 우수한 결과를 얻었다. 시뮬레이션과 실험 결과를 통해서 에어컨 시스템에서의 개선된 고조파와 저감된 EMI 효과를 보여준다.

• 전력전자학회논문지
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• 제5권6호
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• pp.560-567
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• 2000

최근 들어 인버터 에어컨과 같은 유도전동기 구동 분야에서 인버터에 역달제어회로를 부가한 PFC 인버터에 대한 논의가 활발하게 진행되고 있다. 본 연구에서는 이러한 PFC 인버터의 효율을 개선하기 위하여 ZVT 스위칭 기법을 적용하는 방법에 대하여 논하고, 이ㅡㄹㄹ 동작 모드에 따른 해석과 함께 최적의 회로를 설계하였으며, 제안된 회로를 시뮬레이션 및 실험을 통하여 그 유용성을 입증하였다.

• 산업기술연구
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• 제32권A호
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• pp.39-45
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• 2012

In this paper the digital control scheme of interleaved PFC for 3-phase modular UPS is presented. The interleaved PFC is composed of two identical PFC connected in parallel and each PFC is controlled by the interleaved switching signals which have the same switching frequency and the $180^{\circ}$ phase difference. As a consequence of the interleaving operation, the Interleaved PFC exhibits both lower current ripple at the input side and lower voltage ripple at the outside. Therefore, the switching and conduction losses as well as EMI levels can be significantly decreased. Simulation and experimental results verify the usefulness of the interleaved PFC.

• Smart Structures and Systems
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• 제22권6호
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• pp.643-662
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• 2018

One of the methods for investigation of mechanical behavior of materials is numerical simulation. For simulation, its need to model behavior is close to real condition. PFC is one of the rock mechanics software that needs calibration for models simulation. The calibration was performed based on simulation of unconfined compression test and Brazilian test. Indeed the micro parameter of models change so that the UCS and Brazilian test results in numerical simulation be close to experimental one. In this paper, the effect of four micro parameters has been investigated on the uniaxial compression test and Brazilian test. These micro parameters are friction angle, Accumulation factor, expansion coefficient and disc distance. The results show that these micro parameters affect the failure pattern in UCS and Brazilian test. Also compressive strength and tensile strength are controlled by failure pattern.

• Journal of Power Electronics
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• 제18권6호
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• pp.1819-1829
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• 2018

A three-phase, three-switch, and three-level boost-type PWM rectifier (Vienna rectifier) is proposed as an active front-end power factor correction (PFC) rectifier for telecom loads. The proposed active front-end PFC rectifier system is modeled by the switching cycle average model. The relation between duty ratios and DC link capacitor voltages is derived in terms of the system input currents. Furthermore, the feasible switching states are identified and applied to the proposed system to reduce the switching stress and DC ripples. A detailed equivalent circuit analysis of the proposed front-end PFC rectifier is conducted, and its performance is verified through simulations in MATLAB. Simulation results are verified using an experimental setup of an active front-end PFC rectifier that was developed in the laboratory. Simulation and experimental results demonstrate the improved power quality parameters that are in accordance with the IEEE and IEC standards.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.191-193
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• 2002

최근, 전기품질에 관한 중요성과 EMI에 의한 규정이 강화되면서 PFC 컨버터에 관한 연구가 많이 이루어지고 있다. 본 연구에서는 matlab을 활용하여 3상 PFC 컨버터를 효율적으로 시뮬레이션하는 연구를 수행한다. 단위역률을 위한 3상 컨버터 PFC 제어는 링크전압제어부, 전류제어부, SVPWM 제어부로 구성된다. 3상 PFC 컨버터를 matlab/simulink로 구성하여 시뮬레이션을 수행한 결과. 상전압과 상전류의 위상이 일치하여 단위역률이 잘 실현됨을 나타내고 있다. 본 연구는 PFC 컨버터의 설계 및 유사회로의 시뮬레이션에 유용하게 활용될 것이다.

• Journal of Power Electronics
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• 제6권2호
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• pp.121-130
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• 2006

This paper presents the performance and efficiency of a drive system incorporating a switched-reluctance motor (SRM) with input power factor correction (PFC). The proposed system consists of a PFC, bi-directional converter, an inverter, and a SRM operating as based voltage source drives (VSD). First, theoretical analysis is made for each identified mode of operation in the drive system. This is followed by comparing the performance of the SRM drive system with and without a PFC circuit. The losses are also calculated for both systems and overall efficiency. Experimental results are presented to prove the theoretical analysis.

• 제어로봇시스템학회논문지
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• 제21권12호
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• pp.1152-1159
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• 2015

Switching power supply systems are widely used in many industrial fields. Power factor correction (PFC) circuits have a tendency to be applied in new power supply designs. The PFC circuit with a boost converter using an input power source is studied in this paper. In a boost PFC circuit, there are two feedback control loops: a current feedback loop and a voltage feedback loop. In this paper, the regulation performance gained by using the output voltage and compensator to improve the transient response presented at the continuous conduction mode (CCM) of the boost PFC circuit is analyzed. The validity of the designed boost PFC circuit is confirmed by both MATLAB simulation and experimental results.