This paper investigates the effect of the variation of duty ratio on the different performance parameters of the three non-isolated dc-dc converters namely buck, boost and buck-boost converter. Five important parameters dependent on the duty ratio have been identified namely output voltage, output current, effective impedance at the input, minimum inductance and minimum capacitance for continuo...

The modern wind turbines (WT), equipped with power converters (full or partial power converters) connected to the grid, have increased rapidly in recent years. Harmonic assessment of the power quality is a necessary study for interconnection of future wind farm to the grid. Normally, the power quality assessment in wind farm is done considering the power converter as an ideal harmonic current s...

For the integration of distributed generation (DG) units to the utility grid, voltage source converter (VSC) is the key technology. In order to realize high quality power injection, different control techniques have been adopted. However, the converter-based DG interface is subject to inevitable uncertainties, which adversely influence the performance of the controller. The interfacing impedanc...

Conditioning a current source using OCCII-GIC for EIT systems Ali Zarafshani, Thomas Bach, Wei Wang and Chris Chatwin Instrumentation and Hardware, Bioelectrical Research Group, Engineering and Design, University of Sussex, England, BN19QT Sensatech Research, Brighton, England, BN2 0GP [email protected] Abstract: A multi-Frequency EIT has been developed to evaluate the permittivity spec...

This paper presents theoretical estimation of the conducted electromagnetic emissions from a SMPS, based on Fourier analysis. The theory is applied to a buck converter. The comparison between the theoretically estimated and measured EMI shows that the CM EMI was well predicted. Up to 3 MHz the measured DM noise was much lower than the predicted one, which could be because of unknown DM noise so...

A general small-signal model for current-programmed switching power stages is used for design-oriented analysis of a 150-W buck regulator and of a 280-W boost regulator. The model, into which the current-programming minor feedback loop is absorbed, exposes the desired tendency towards “constant” output current. The regulator voltage loop remains #he only explicit feedback loop, allowing the reg...

Abstract – A novel passive boost power converter forsingle-phaseswitched reluctance motor is presented. A simple passive circuit is proposed comprisingthree diodes and one capacitor. The passive circuitis added in the front-end of a conventional asymmetric converter to obtain high negative bias. Based on this passive network, the terminal voltage of the converter side is a general DC-link volta...

Silicon carbide (SiC) devices provide significant performance improvements in many aspects, including lower power dissipation, higher operating temperatures, and faster switching, compared to conventional Si devices. All these features helped increase the interest in the applications of these devices for electric drive systems. The inclusion of an impedance network to elevate DC voltage would i...

This paper addresses voltage control of distributed dc power systems. DC power systems have been discussed as a result of the introduction of renewable, small-scale power generation units. Also, telecommunication power systems featuring UPS properties might benefit from a broader introduction of dc power systems. Droop control is utilized to distribute the load between the source converters. In...