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This paper deals with dynamic power factor correction using Cuk converter that can be operated in continuous and discontinuous conduction. It is used to overcome the effect of diode bridge rectifier that draws non-sinusoidal current from the AC source and makes the input power factor very poor. The THD of the input current at the AC mains and input power factor are analysed with the diode bridge rectifier,...
The discontinuous current mode (DCM) boost power factor correction (PFC) converter features zero-current turn-on for the switch, no reverse recovery in diode and constant frequency operation. However, due to DCM, the energy transfer does not cover the whole switching cycle, the peak and RMS values of the inductor current are large, which also occurs to the switch and diode. This increases not only...
This paper present a study about a power supply, study which can be applied to another supply circuits. This study can be useful also in the learning process. I start the study from modulation of mathematical equations for Flyback Converter. I demonstrate the difference between Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM) true the Matlab graphics. I made analytic numerical...
In this paper analysis of output voltage ripples of a switching frequency modulated (SFM) buck converter operating in discontinuous conduction mode (DCM) is performed. The ripples are analyzed in both time and frequency domains by the use of theoretical derivations and computer simulations. Significant increase in output voltage ripples under DCM is observed after using periodic SFM. Low frequency...
This paper presents a peak current mode control of a boost rectifier with low distortion of the input current for wind power systems based on permanent magnet synchronous generators with variable speed operation. The three-phase boost rectifier is operated in discontinuous conduction mode (DCM). It is shown that the DCM operation significantly reduces the total harmonics distortion of the currents...
For low conversion ratios boost rectifier has a power factor less than unity when operated in discontinuous conduction mode and constant duty cycle. This paper proposes a simple duty cycle modulation technique to reduce the line harmonics and improve the power factor of the boost rectifier, even for low conversion ratios. A periodic voltage signal is used to vary the duty cycle of the boost switch...
This paper presents a time domain method to analyze the three phase rectifier with capacitor output filter. As demonstrated in the paper, the proposed method analytically evaluates harmonics, and obtains exact switching functions by iteratively solving for the switching instants. An analytical Jacobian of the mismatch equations is obtained to ensure a quadratic convergence rate for the iteration process...
A novel PWM technique for single-switch three-phase AC-DC buck converter is proposed to reject input voltage fluctuation, obtain high quality output voltage and realize open-loop operation mode. By controlling the duty cycle of the switch which tracks the change of input voltage, the energy supplied by AC mains and the energy consumed in load can keep invariable in every switching cycle. So the output...
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