The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper describes a five-level diode-clamped PWM inverter intended for a medium-voltage motor drive without regenerative braking. It is equipped with a specially-designed circuit that plays an important role in achieving voltage balancing of the four split dc capacitors connected in series at the dc input terminals of the inverter. The voltage-balancing circuit frees the inverter to concentrate...
Exploitation strategies of electric power and industrial equipment, stimulated mainly by economic and environmental trends, play a crucial role in ensuring uninterrupted power delivery and continuous operation. The diagnostics of industrial equipment is particularly important in this context, due to both operational multistresses and the strive for higher and higher voltage levels as well as due to...
This paper describes the main trends and future challenges of electrical networks embedded in “more electrical aircraft” especially in the fields of industrial electronics and energy conversion. In the first part, the current context and new standards are put forward, emphasizing the main evolutions on aircraft architectures, from AC fixed frequency networks, variable frequency to “Bleedless” architectures...
Airborne Wind Turbines (AWT) represent a radically new and fascinating concept for future harnessing of wind power. This concept consists of realizing only the blades of a conventional wind turbine (CWT) in the form of a power kite flying at high speed perpendicular to the wind. On the kite are mounted a turbine, an electrical generator and a power electronics converter. The electric power generated...
This paper introduces a novel maximum power point tracking technique aimed at maximizing the power produced by photovoltaic systems. The largest part of the approaches presented in literature are based on the sensing of the photovoltaic generator voltage. On the contrary, in this paper a current-based technique is proposed: the sensing of the current in the capacitor placed in parallel with the photovoltaic...
This paper proposes a new hybrid nine-level inverter topology for IM drive. The nine-level structure is realized by using two three-phase two-level inverters fed by isolated DC voltage sources and six H-bridges fed by capacitors. The number of switches required in this topology is only 36 where as the conventional nine-level topologies require 48 switches. The voltages across the capacitors, feeding...
In this paper, an ultra-low-voltage charge pump is presented. Two techniques are used to reduce required number of stages and improve power efficiency, namely clock boosting and Vt cancellation. Clock boosting is employed to increase the output voltage per stage resulting in lower number of stages, and hence smaller output resistance. Vt cancellation is achieved by using an auxiliary circuit that...
For energy harvesting applications, a power management unit (PMU) architecture operating at low input voltages is required. The most critical sub-blocks of such a PMU are the voltage multiplier and the low-voltage clock generator. An ultra-low-voltage exponential gain charge pump (ECP) that serves as a voltage multiplier for such PMUs is analyzed. A low-cost fully-integrated CMOS implementation for...
This paper presents a new study of a modified Sheppard-Taylor-based Power Factor Correction (PFC) circuit used for single-phase low-voltage high-current applications. The proposed converter is designed to operate in Continuous Inductor Current Mode and Discontinuous Capacitor Voltage Mode (CICM/DCVM). In this mode of operation, the PFC provides zero-voltage turn-off switching, as well as natural input...
This paper presents a novel matrix converter based drive technique for three phase brushless DC (BLDC) machines. In contrast to existing matrix converter based drives, the proposed technique uses a topology that has less number of semiconductors and a unique switching sequence to drive three phase BLDC machines directly from single phase mains supply lines without a DC link capacitor. The paper describes...
This paper focuses on the problem of driving parallel strings of LEDs while ensuring current equalization between them. This issue is addressed in terms of proposing a small and simple linear topology that can be used on a number of series-associated LEDs, working as a constant current source for each string. Such topology employs a four-component circuit, with low dependence on transistor parameters,...
Electronic ballast for fluorescent lamp with high power factor is traditionally implemented in two stages: first one to obtain a unity power factor and second one to feed properly the lamp. Different topologies have been studied in order to able reduce the number of stages and employed controllers. In this paper a different electronic ballast, which is based on the ‘Z’ source inverter is analyzed,...
The penetration of Distributed Generation (DG) in power systems is deeply changing the existing distribution networks which is becoming a very sophisticated and complex systems incorporating both active (generators) and passive systems (distribution systems, converters and loads). The necessary simplification can be obtained dealing with small networks, namely Micro-Grids, reproducing, in a smaller...
This paper presents results on wide-band modeling of DC-DC flyback converter. The model of converter is composed of detailed models of transformer, transistors, diodes and tracks. Parameter identification methods are based on manufacturer data sheet and externally measurable characteristics and parameters. The templates of models are written in the MAST and implemented for simulation in the SABER...
This paper presents the design of an adaptive optimal controller based on genetic algorithm (GA) for digital DC-DC converters. The proposed GA controller adopts integral time absolute error (ITAE) of the output voltage as the cost function. The algorithm is implemented in a Xilinx Virtex-4 field-programmable gate-array (FPGA). It achieves an optimal response within four generations and in a time of...
The aim of this paper is to implement the CORDIC algorithm in the most used 3-phase voltage grid synchronization techniques. The CORDIC algorithm is an efficient trigonometric calculus processor, which makes possible to solve complex trigonometric functions by means of a shift-adder structure, thus obtaining a very efficient calculus core which achieves a short computation time when used in FPGA or...
This paper presents a scalable and effective discontinuous pulse width modulation algorithm for multileg converters. The method can also be used in three- and four-leg voltage-source converters, though its simplicity in comparison to so called vector modulators shows up clearly in systems with more than three legs. Some similarities between vector and sinusoidal modulations are discussed and issues...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.