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.
Further growth in renewable energy integration would be dependent on reliability and cost-effectiveness. These two factors can be achieved through power converter topologies that enable transformer-less connection of renewable energy based technology to the grid. This paper presents a three phase five level dual tapped inductor quasi impedance source (qZS)-nested neutral point clamped (NNPC) topology...
Cascaded or distributed module-level inverters are becoming increasingly desirable for photovoltaic applications. The authors have demonstrated an AC-stacked topology that allows each inverter to operate completely autonomously from all the others. The only required communications is a low-bandwidth synchronization signal communicated from the point-of-grid-connection. This paper describes the communications...
This paper presents the design process of a 13.56 MHz 10 kW and high efficiency inverter for wireless power transfer systems. The new 650V E-mode GaN is used in multiphase resonant topology to obtain high output power. The optimized efficiency design and the driver design are presented in detail. The circuit simulation results show that the inverter achieves 10 kW output power with the efficiency...
Ultra sparse matrix converter(USMC) is a derived form of Indirect matrix converter(IMC) having less no of switches. Though it has unidirectional power flow capability it is very useful for specific applications such as wind energy systems, electrohydrostatic actuator, variable speed drives etc. However its main limitation is lower gain for which various control strategies and topological changes had...
Droop control is a widely used technique for load sharing in DC microgrids (MGs). However, it has its limitations due to the MG voltage deviating from its rated level and, more importantly, it suffers from possible poor current sharing accuracy. Voltage drops across coupling line impedances is the main factor that causes these limitations, which is further deteriorated by the virtual impedance introduced...
An electromagnetic interference (EMI) filter design method for electric vehicle (EV) application is proposed in this paper. By transforming the design problem to an optimization problem, the filter volume, system disturbance level, inverter touch current and filter leakage current are taken into account simultaneously. A topology and order evolution approach is merged into the optimization algorithm...
In this paper multiple feedback(FB) active filter configurations for DM EMI noise in the input side of AC/DC converters has been analyzed using developed models and then their performance was compared over single FB active filters using measurements. First, a single FB active filter circuit model is developed in the open loop and then based on DM EMI noise model of AC/DC converters, a closed loop...
There is a conflict between the energy transfer efficiency and maximum transferred power in conventional inductive power transfer (IPT) systems, and the energy transfer efficiency is only 50% when maximum power is transferred. To solve this problem, a new topology which is operated at switched-mode is proposed in this paper. The high frequency current of the topology is generated by the free oscillation...
This paper deals with the implementation of a Maximum Constant Boost Control (MCBC) for a 9-Switch z-source power inverter supplying two induction motors. This topology allows greatly reducing the number of power switches, the switching-losses, the volume, and therefore the system cost. In Electric Vehicle (EV) application, a 9-switch power inverter requires a DC-DC converter to boost batteries output...
Active rectifier topologies are used for different purposes, especially widespread in renewable generation and distributed energy sources. The most common configuration for active rectifiers is the back-to-back converter. In this article, a back-to-back structure for connecting a variable frequency source to the utility grid is observed and a control algorithm, robust to grid impedance values, is...
This paper proposed an adaptive impedance control method in multi-bus distributed islanded micrigrid to share reactive power accurately and suppress circulating current. The multi-bus distributed microgrid is more complicated than one-bus because of its different bus voltages and variable structure. To deal with the power sharing problem in multi-bus distributed islanded micrigrid, two methods have...
Fluctuation Enhanced Sensing is a well known technique, based on noise measurements, to improve sensitivity and selectivity for chemical/biological sensing. Trans-impedance amplifiers (TIAs) are the natural choice as front-end for the measurement of the low frequency noise (LFN) generated by the sensor. In this work we propose a low-noise TIA topology which allows maintaining a large bandwidth also...
Ferroelectret films are a relatively new material. Highly anisotropic polymers can be polarized resulting in a piezoelectric response. Advances in manufacturing techniques and polarization have made this technology a viable option in various applications: pressure sensors, air transducers (0.05 MHz–0.6 MHz) and in configuration of patch transducers as pulse sensors and for Lamb waves. Previous experience...
Based on Time-Domain Reflectometry (TDR) technique, a new method which could reconstruct the topology of an unknown or partially unknown network is proposed in this paper. This approach, the TDR-NEW approach, allows the network to be retrieved by drawing its interconnections and estimating the lengths of branches. Two complementary steps are addressed. In the first step the direct problem is modeled...
This paper discusses the limitations of power line communication (PLC) in vehicles, regarding system loads, transceiver coupling circuits and cable topology. Firstly, ECU input impedances were analyzed to obtain typical termination load conditions in modern vehicle power supply systems. Coupling circuits and cable harness topologies for the power distribution network were proposed, as well. Then,...
This paper presents the design and implementation of an 8-channel low-noise chopper-stabilized analog front-end (AFE) for electroencephalogram (EEG) acquisition system. Each channel of the AFE is composed of an AC-coupled chopper instrumentation amplifier (ACCIA), a programmable gain amplifier (PGA), and a buffer. A positive feedback loop is adopted to boost its input impedance while the low-pass...
This paper presents an approach to study and simulate the signal transmission characteristics over the access low voltage distribution networks in Tunisia within narrowband frequency (up to 500kHz). A theoretical model of a two-port network is built to derive the transfer function of a typical low voltage power line communication network. This model is designed based on two wires widely used, the...
The flipped voltage follower (FVF), a variant of the common-drain transistor amplifier, comprising local feedback, finds application in circuits such as voltage buffers, current mirrors, class AB amplifiers, frequency compensation circuits and low dropout voltage regulators (LDOs). One of the most important characteristics of the FVF, is its low output impedance. In this tutorial-flavored paper, we...
When power grid voltage sag occurs simultaneously with some other power quality problems, it will be necessary to install a variety of power quality conditioners. In order to effectively analyze potential interaction resulted from combined operation of the series and shunt compensation devices with no common dc bus. This paper has deeply derived the impedance models of DVR and DSTATCOM, then illustrates...
The issue of Electromagnetic Interference in Electrical Vehicles due to the power conversion units pushes the need for new filtering solutions. Higher and higher performances are required to meet the stringent emissions limits while at the same time low volumes and design for production are two mandatory aspects in order to be competitive in the market. This paper introduces a step by step design...
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.