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In this paper, we focus on the quality of experience (QoE) optimization for dynamic adaptive streaming over HTTP (DASH) services. First, we propose a QoE evaluation model based on playback continuity, segment media quality and perceptual quality fluctuations caused by bitrate switching. Plenty of subjective mean-opinion-score (MOS) tests have shown a good correlation between this model and subjective...
In interactive multiview video streaming (IMVS), a client periodically requests switches to neighboring views for uninterrupted temporal video playback from a server storing a large number of pre-encoded views. The technical challenge is that the navigation path taken by a client is not known at encoding time, and thus it is difficult to employ differential coding to lower code rate without knowing...
Commercial thyristors of tablet design with diameters of silicon wafers of 40 to 56 mm and an operating voltage of 2 to 2.4 kV DC were triggered by an external overvoltage pulse applied across the thyristor main electrodes. In experiments a voltage rise rate across the thyristor was changed from 0.5 to 6 kV/ns. Under such conditions the thyristor closing process occurred due to initiation and propagation...
High voltage, pulse power Silicon Carbide (SiC) thyristors have been under development at GE Global Research Center for the past decade. Previous tests of these relatively mature devices have shown that they can reliably hold off high voltages (> 3 kV) at extremely low leakage currents (nanoamps), and carry high pulse currents (> 1.5 kA) on microseconds timescales, while surviving millions of...
Power converter is an important technology in industrial process, train traction and ship propulsion powered by different electric drive system. In this paper, sub-multilevel inverter is used to obtained multilevel waveform which uses reduced number of switches in comparison of other conventional multilevel inverter for same output levels. A comparison of THD produced in the output voltage generated...
Power semiconductor devices are one of the most essential components in electrical vehicles. Traditionally, silicon has been used as the semiconductor material in switching devices. Si material has reached its technological limits like switching frequency, maximum operation temperature etc., which lead to exploring new semiconductor materials for switching devices. In this paper Wide Band-Gap materials...
This paper investigate the various changes offered such as loading and power injection pattern in power system network. An attempt has been made in understanding the system behavior as loading patterns are changed and also the power injection statistics is altered. The present work deals with an investigation of power network (IEEE-14 bus system) for deciding the parametric boundaries for effective...
Multilevel inverters are an attractive choice for multi mega-watt industrial drive applications. In comparison with conventional two level voltage source inverter this technology gives quality performance. In this paper comparison of three classical topologies of three phase multilevel inverter is presented. The multilevel inverters analyzed using MATLAB-Simulink software are Neutral-Point-Clamped...
In this paper a new single-phase multilevel inverter topology is presented. Proposed topology is capable of producing nine-level output voltage with reduce device counts. It can be done by arranging available switches and dc sources in a fashion such that the maximum combination of addition and subtraction of the input dc sources can be achieved. Comparison between the existing topologies shows that...
Matrix Converter consists of an array of bilateral switches, which are used to directly connect the three phase AC power supply to a load without using any dc-link or large energy storage elements. Modulation techniques used for Matrix Converters were based on the transfer function models developed for the circuit. Carrier based PWM schemes are very popular for voltage source inverters, as they are...
Variable speed induction motor drives for constant torque applications often employ Pulse Width Modulated Voltage Source Inverters for exercising speed control through constant volts/hertz control. Although such drive systems offer a wide range of speed control, they however create severe power quality problems on the source side. In order to overcome these power quality problems, an alternative drive...
In this paper a new hybrid switched capacitor multilevel inverter topology is proposed. The inverter consists of a switched capacitor unit and a leg of three phase two level voltage source inverter. By the proposed topology we can get higher level of line voltage using less number of switches. Thus switching loss will be lesser and efficiency will be higher. The said topology is simulated in MATLAB/SIMULINK...
The reduced order H∞ observer design problem for one-sided Lipschitz nonlinear continuous-time singular Markov jump systems is discussed in this paper. With the assumptions that the nonlinear term satisfies the one-sided Lipschitz condition and the quadratic inner-bounded condition, a sufficient condition is given to guarantee both the stochastic stability and a prescribed H∞ performance of the error...
The understanding of the switching mechanisms in resistive random access memory is of interest as one can use the fundamental mechanisms to better design the memory structure for enhancing both switching and reliability performance. Various analytical methods have been explored to better understand the wear-out and eventual failure mechanisms of RRAM stacks. This includes atomic-scale characterization...
For renewable energies power electronics is a key technology whereas much of the power conversion in the future grid or power plants is done using power electronic converters. By establishing cheaper and smaller solutions to solve the problems dealing with high power transmission the expansion of renewable energies can be advanced. As highly efficient actuators these converters have to be properly...
This paper gives an overview of the current state of the art device technology for SiC discrete devices and applications. The superior switching performance is discusses as well as the energy efficiency of SiC devices. New emerging applications of SiC devices are also discussed focusing on high temperature capability such as integrated digital and analog circuits up to 600 C. Finally, MEMS and Bio...
In this paper, the full-order unknown input observer (UIO) design problem for one-sided Lipschitz nonlinear continuous-time singular Markovian jump systems is investigated. First, with the assumption of one-sided Lipschitz condition and quadratic inner-bounded condition, a sufficient condition is established, which guarantees the error dynamic system is stochastically stable. By using the matrix generalized...
A new 60 V rating split gate trench MOSFET fabricated with the state-of-the-art process technology has been investigated and evaluated in the secondary synchronous rectifier board. It shows the best-in-class specific resistance of 10.9 mΩ·mm2 and the figure-of-merit (FOM) of 85 mΩ·nC which is the product of the on-resistance and the gate charge.
Hydrogen-related donors can be formed by using only a moderate thermal budget, so that this process can be used to create field-stop layers in thin power devices. The electrical characteristics of 1200 V IGBTs and diodes provided with such field-stop layers are presented and compared with the characteristics of conventionally processed devices. Moreover, tailoring the field-stop distribution by multi-energy...
3D power module structures allow for better cooling and lower parasitic inductances compared with the classical planar technology. In this paper, we present a hybrid half-bridge in a 3D packaging configuration, dedicated for high voltage application. A dynamic electrical test of the package is presented.
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