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DC-DC Converter with Three-Phase Power Factor Correction for Arc Welder
Khairy Sayed,Keiki Morimoto,Soon-Kurl Kwon,Katsumi Nishida,Mutsuo Nakaoka 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper presents a PWM converter, which enables to maintain high power-factor of arc welding power supply and to suppress input current harmonics. The main function of this system is to maintain unity power-factor by controlling input current to be sinusoidal, and to generate stable DC output voltage through half-bridge inverter and output rectifier. The proposed converter has high power factor, low harmonic distortion, and tight output regulations. A control scheme is employed to reduce the switching and rectification losses. The modeling and simulation analysis are performed to evaluate the performance characteristics. The proposed converter meets the IEC 61000-3-2 regulations with near-unity power factor and high efficiency.
New DC Rail Side Soft-Switching PWM DC-DC Converter with High Frequency Planar Transformer
Khairy Sayed,Keiki Morimoto,Soon-Kurl Kwon,Katsumi Nishida,Mutsuo Nakaoka 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper presents a new circuit topology of active edge resonant snubbers assisted half-bridge soft switching PWM inverter type dc-dc high power converter for DC bus feeding power plants. The proposed dc-dc power converter is composed of typical voltage source-fed halfbridge high frequency PWM inverter with a high frequency planar transformer link in addition to input DC busline side power semiconductor switching devices for PWM control scheme and parallel capacitive lossless snubbers. The operating principle of the new DC-DC converter treated here is described by using switching mode equivalent circuits, together with its unique features. All the active power switches in the half-bridge arms and input DC buslines can achieve ZCS turn-on and ZVS turn-off commutation transitions. The total turn-off switching losses of the power switches can be significantly reduced. As a result, a high switching frequency IGBTs can be actually selected in the frequency range of 60 ㎑ under principle of soft switching. The performance evaluations of the experimental setup are illustrated practically. The effectiveness of this new converter topology is proved for low voltage and large current dc-dc power supplies as DC bus feeding from a practical point of view.
Islam El-Sayed Soliman,Asem El-Sayed Metawa,Mohamed Abdel Hameed Aboelnasr,Khairy Tohamy Eraba 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.12
Surface treatment of sol-gel bioglass is required to increase its biomedical applications. In this study, a dielectric barrier discharge (DBD) plasma treatment in atmospheric pressure was performed on the surface of [SiO2- CaO-P2O5-B2O3] sol-gel derived glass. The obtained bioglass was treated by plasma using discharge current 12mA with an exposure period for 30 min. The type of discharge can be characterized by measuring the discharge current and applied potential waveform and the power dissipation. Apatite formation on the surface of the DBD-treated and untreated samples after soaking in simulated body fluid (SBF) at 37 oC is characterized by Fourier transform infrared spectroscopy (FTIR), X-Ray diffraction (XRD), inductively coupled plasma (ICP-OES) and scanning electron microscopy coupled with energy dispersive spectroscopy (SEM/EDS). We observed a marked increase in the amount of apatite deposited on the surface of the treated plasma samples than those of the untreated ones, indicating that DBD plasma treatment is an efficient method and capable of modifying the surface of glass beside effectively transforming it into highly bioactive materials.
Boost-Half Bridge Single Power Stage PWM DC-DC Converters for PEM-Fuel Cell Stacks
Soon Kurl Kwon,Khairy F. A. Sayed 전력전자학회 2008 JOURNAL OF POWER ELECTRONICS Vol.8 No.3
This paper presents the design of 1 ㎾ prototype high frequency link boost half bridge inverter-fed DC-DC power converters with bridge voltage-doublers suitable for small scale PEM fuel cell systems and associated control schemes. The operation principle of this converter is described using fuel cell modeling and some operating waveforms. The switching mode equivalent circuits are based on simulation results and a detailed circuit operation analysis at soft-switching conditions.
An integral square error-based model predictive controller for two area load frequency control
Kassem, Ahmed M.,Sayed, Khairy,El-Zohri, Emad H.,Ali, Hossam H. Techno-Press 2017 Advances in energy research Vol.5 No.1
The main objective of load frequency control (LFC) is to keep the frequency value at nominal value and force deviation of the frequency to zero in case of load change. This paper suggests LFC by using a model predictive control (MPC), based on Integral Square Error (ISE) method designed to optimize the damping of oscillations in a two-area power system. The MPC is designed and simulated with a model system in state space, for robust performance in the system response. The proposed MPC is tuned by ISE to achieve superior efficiency. Moreover, its performance has been assessed and compared with the PI and PID conventional controllers. The settling time and overshoot with MPC are extremely minimized as compared with conventional controllers.
Boost-Half Bridge Single Power Stage PWM DC- DC Converters for PEM-Fuel Cell Stacks
Kwon, Soon-Kurl,Sayed, Khairy F.A. The Korean Institute of Power Electronics 2008 JOURNAL OF POWER ELECTRONICS Vol.8 No.3
This paper presents the design of 1 kW prototype high frequency link boost half bridge inverter-fed DC-DC power converters with bridge voltage-doublers suitable for small scale PEM fuel cell systems and associated control schemes. The operation principle of this converter is described using fuel cell modeling and some operating waveforms. The switching mode equivalent circuits are based on simulation results and a detailed circuit operation analysis at soft-switching conditions.