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이상현(S. H. Lee),배은경(E. K. Bae),신철준(C. J. Sin),전기영(K. Y. Jeon),전지용(J. Y. Jeon),오봉환(B. H. Oh),이훈구(H. G. Lee),한경희(K. H. Han) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
In this paper, The authors apply a state feedback control using an optimal control theory to improve the stability of the control and the dynamic response of the DC-DC converter system with a number of different loads. To execute a this state feedback control, The authors present the pole placement technique using Linear Quadratic Regulator(LQR) to optimally control the system. An integrator can also be included in the open-loop path in order to minimize the steady-state error of the output voltage. To confirm the superiority of the controller, The simulation results are presented.
후방산란법(RBS) / 양성자 여기 X-선 방출법(PIXE)을 이용한 다층자성박막의 두께 및 조성 정량분석
김태곤(T. G. Kim),전기영(G. Y. Jeon),황정남(C. N. Whang),신유하(Y. H. Shin),김영만(Y. M. Kim),송종한(J. H. Song),장성호(S. H. Jang),김광윤(K. Y. Kim) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.6
A spin valve structure of Ta/NiFe/CoFe/Cu/CoFe/Ru/CoFe/FeMn/Ta which has a synthetic antiferromagnet (CoFe/Ru/CoFe), was fabricated by using a magnetron sputtering system. The thickness and composition of magnetic free and pinned layers affect the magnetic properties such as exchange interaction strength of each layer and so on. Even though Rutherford Backscattering Spectrometry (RBS) has advantages of quantitative and non-destructive analysis, it is almost impossible to determine the thickness and composition of magnetic thin films using RBS because of its poor mass resolution for a higher atom number (Z>20). In this study, quantitative analysis of the element composition and thickness for the spin valve sample was performed by combining both Proton Induced X-ray Emission Spectrometry (PIXE), which is one of element specific analysis techniques, and grazing-exit RES with a highly improved depth resolution and absolute quantitative analysis. For the quantitative analysis, standardization of PIXE was carried out with NiFe, CoFe, and FeMn layers, which are one of constituent layers of spin valve films. Through PIXE standardization and the aid of PIXE experimental results of the spin valve sample, the overlapped signal in a grazing-exit RBS spectrum were successfully resolved and the thickness of the Ru layer was determined with a resolution of ~1 Å.
신철준(C. J Sin),전기영(K. Y. Jeon),이승환(S. H. Lee),강승욱(S. U. Kang),오봉환(B. H. Oh),정춘병(C. B. Chung),이훈구(H. G. Lee),한경희(K. H. Han) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
In this paper, The authors study the boost Regulator as a DC-DC Converter like a power supply and describe the investigation result about the two phase with combined boost regulator which has the same effect that the switching frequency of the solid-state-switch is two times. As a result, the ripple of the input current and output current is better improved.
극배치 제어기법을 이용한 자기부상열차용 전원장치에 관한 연구
정춘병(C. B. Chung),이상현(S. H. Lee),김은기(E. K. Kim),조정민(J. M. Jo),전기영(K. Y. Jeon),강승욱(S. O. Kang),김용주(Y. J. Kim),한경희(K. H. Han) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
When the magnetic levitation system(MAGLEV) initially rise, The MAGLEV has a weak point that is very large variation of the electric current. In this paper, The author applied the multi-loop-control to stably control the magnetic levitation system(MAGLEV). The gains of the control algorithm were selected based on pole locations formulated from a prototype Bessel transfer function model. The design incorporate tradeoffs in DC-to-DC converter hard-ware para -meters and pole locations. In order to confirm the superiority of the proposed pole selection and controller, MATLAB simulation and experiment results are presented.
이재훈(J. H Lee),김은기(E. G Kim),전기영(K. Y Jeon),전지용(J. Y Chun),이승환(S. H Lee),오봉환(B. H Oh),이훈구(H. G Lee),한경희(K. H Han) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
In this paper, The authors design the current controller which independently control the d, q axis current transformed by the synchronously rotating d, q axis and a Space Vector Pulse Width Modulation(SVPWM) to steadily control the output DC-Link voltage against the variable load of the three phase PWM converter. Also, This study improves the high power factor, stability, and rapid response by the phase angle control using the digital Phase Locked Loop(PLL).
부하토크외란관측기와 속도센서리스 벡터제어를 이용한 철도모의장치의 Anti-Slip 제어
이상집(S.C. Lee),권중동(J.D. Kwon),김은기(Y.K. Kim),조정민(J.M. Jho),전기영(K.Y. Jeon),이승환(S.H. Lee),오봉환(B.H. Oh),이훈구(H.G. Lee),김용주(Y.J. Kim),한경희(K.H. Han) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
This paper estimate coefficient of adhesion through speed sensor-less vector control and load torque disturbance observer used for maximum tractive force control. And also proposes anti-slip control algorithm, which controls torque force of motor in order to keep the estimated adhesion force in maximum adhesion by controlling PI torque with the differential value of estimated adhesion force coefficient.
김은기(E. G. Kim),이재훈(J. H. Lee),전기영(K. Y. Jeon),이승환(S. H. Lee),오봉환(B. H. Oh),이훈구(H. G. Lee),김용주(Y. J. Kim),한경희(K. H. Han) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
The rotor speed and flux information is most important in the vector control. The accuracy of flux observers for induction machine inherently depends on parameter sensitivity. The control strategy is using online flux observer for flux estimation. In the proposed system, the speed control characteristics using a online flux observer control isn't affected by a load torque parameter disturbance. Simulation results are presented to prove the effectiveness of the adaptive sliding mode controller for the drive variable load of induction motor.