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90-260V_rms 입력범위를 갖는 단일전력단 고역률 컨버터
김학원(Hag-Wone Kim),문건우(Gun-Woo Moon),조관열(Kwan-Youl Cho),윤명중(Myung-Joong Youn) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
A new single stage power factor corrected AC/DC converter has been proposed, that is unified with buck topology and suitable for universal input The design example of the proposed converter for 5V 12A application has been presented. The design considerations and simulation results for the proposed converter have been shown. The simulation results show that the line input current harmonics can meet IEC 1000-3-2 Class D requirements for the line input voltage from 90 to 260V.
영구자석 동기전동기 구동을 위한 전압원 인버터의 적응제어기법을 이용한 전압 왜곡 관측 및 보상
김학원(Hag-Wone Kim),윤명중(Myung-Joong Youn),김현수(Hyun-Soo Kim),조관열(Kwan-Yuhl Cho) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
Generally, a voltage difference exists between the reference and the output voltagesin a pulse width modulated (PWM) voltage source inverter (VSI). In this paper, the nonlinearity in a PWM VSI is analyzed and a new on-line estimation method in consideration of parameter variations for a permanent magnet synchronous motor (PMSM) is proposed to compensate the time varying voltage distortion.
영구 자석 매립형 BLDC Motor의 Sensorless 제어기 설계
김학원(Hag-Wone Kim),안준호(Jun-Ho Ahn),양순배(Soon-Bae Yang),조관열(Kwan-Youl Cho),김정철(Jung-Chul Kim) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
The Inverter fed BLDC(Brushless DC) motor has been increasingly applied to industry and horne appliances due to the advance of power electronics and permanent magnet technology, and its high efficiency and good acoustic noise characteristics The BLDC<br/> motor and drives, however, require the rotor position sensors that may cause some problems such as the high cost and space<br/> In this paper, sensorless algorithm for an interior permanent magnet BLDC motor is proposed The<br/> maximum torque per ampere operation with advance angle considering load torque and speed was simulated and verified through the experiment
김명복(Kim Myung-Bok),김학원(Kim Hag-Wone),김건수(Kim Geon-Su),윤명중(Youn Myung-Joong) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
This paper presents the inductance calculation of compulsator by obtaining the solution of Laplace equation Since the characteristic of material of compulsator makes the boundary conditions changed, this method is useful for various materials of compulsator
레일리 페이딩 채널에서의 OAF 릴레이 시스템에 대한 집합 연산 기반의 분석 기법에 관한 연구
고균병,서정태,김학원,Ko, Kyun-Byoung,Seo, Jeong-Tae,Kim, Hag-Wone 한국전기전자학회 2011 전기전자학회논문지 Vol.15 No.3
본 논문에서는 선택적 증폭후 전달(Opportunistic Amplify-and-Forward: OAF) 릴레이 시스템에 대한 새로운 성능 분석 기법을 레일리 페이딩 채널에 대하여 제안하였다. 제안된 분석 기법에서는 집합 연산(set-operation)을 기반으로 각 릴레이가 최적의 릴레이로 선택될 확률을 유도한다. 그리고 수신된 순시 신호 대 잡음비의 확률 밀도 함수를 기존의 분석 기법보다 일반적인 (확률밀도함수 표현에서 합 기호의 개수 및 그 영역이 구체화된)형태로 제시한다. 그리고 이를 이용하여 평균 오류율, 누락 확률 및 평균 채널 용량을 근사화된 닫혀진 형태로 유도한다. 제안된 성능분석 기법의 정확성은 모의실험을 통하여 검증한다. 성능분석 및 모의실험 결과 비교를 통하여 OAF 기법이 평균 오류 확률, 누락 확률 및 평균 채널 용량 측면에서 비선택적 기법에 비해 성능 향상 정도가 우수함을 확인한다. In this letter, another analytical approach for the opportunistic amplify-and-forward (OAF) relay systems is proposed over Rayleigh fading channels. Based on set-operation at the selected relay node, its selection probability as the best relay is derived and then, the probability density function (PDF) of the received instantaneous signal-to-noise ratio (SNR) is expressed as a more tractable form in which the number of summations and the length of each summation are specified. Then, the average error rate, outage probability, and average channel capacity are obtained as approximated closed-forms. Simulation results are finally presented to validate that the proposed analytical expressions can be a unified frame work covering all Rayleigh fading channel conditions. Furthermore, it is confirmed that OAF schemes can outperform the other non-selective schemes on the average error rate, outage probability, and average channel capacity.