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This paper presents a simulation study for a built prototype of modular multi-level flying capacitor cascade converter as a STATCOM. The converter modulation scheme applied is based on Phase Shifted PWM and the two scenarios which require compensation are investigated to verify this topology. The two scenarios are PCC voltage regulation and unity power factor correction through reactive power compensation...
We demonstrate a self-rectifying, compliance-free, BEOL CMOS-compatible, resistive switching memory device, with nonfilamentary switching mechanism, forming-free operation, analog switching behavior and excellent device to device operation uniformity, down to the smallest device size. The cells have a reset switching current density of ∼0.3MA/cm2 (and ∼10x lower set current). This corresponds to ∼5uA...
Resistive random access memory is one of the most promising non-volatile alternatives to current technologies, such as Flash, due to its simple sandwiched structure, low power consumption, high speed and good endurance1,2. In many cases, the mechanism of resistive switching is believed to be the formation and partial dissolution of nanoscale conductive filaments (CFs) during the set and reset process...
Magnetic vortices are characterized by the sense of in-plane magnetization circulation and by the polarity of the vortex core. Due to the combination of controlled chirality and polarity, magnetic vortices have attracted scientific interest for their potential application as multibit memory cells. However, to obtain the stable ground state, the confined geometries of the vortex structures define a...
The acceleration grid power supply (AGPS) is an important part of neutral beam injector (NBI) system. With the increasing of the NBI power, the requirement for output voltage of the AGPS is becoming higher and higher, even reaching to 1000 kV. As the Inverter type high voltage power supply uses the inverters located at lower voltage side to regulate and cut off the output voltage, it's very suitable...
We have demonstrated that by material engineering using different spices to dope HfO2, RRAM cell switching and endurance / retention reliability characteristics can be modulated. The changes in SET/RESET voltages, endurance optimal programming window and retention result mainly from the oxygen scavenging efficiency of Hf cap in presence of different dopants in HfO2. This impacts directly the formation...
We report a novel self-compliant and self-rectifying resistive switching memory cell, with area-scalable switching currents, featuring a set current density of ∼5nA/nm2 (<9uA for a 40nm-size cell), high on-state half-bias nonlinearity of 102 and low reset current density of <0.6nA/nm2 (<1uA@40nm size). The cell can be operated at below ±4V/10ns, with a large on/off window of >102 and retention...
We report on the performance and reliability of the Hf/HfO2 RRAM cell with Ultra-Thin Oxide (UTO-RRAM). We show that cells with an oxide thickness of 3nm have basic performance (including speed, switching voltages, and the on/off window) similar to that of the cells with reference oxide (5–10nm thickness), while their operation requires a forming step at a voltage of only about 1.5V for a 40nm size...
Shading of even a single photovoltaic (PV) cell can significantly reduce the power of a module. This paper presents a solution by integrating Ćuk bi-directional converters with PV modules which can allow all modules to operate at their individual maximum power points. This is achieved by applying the novel control strategy which enables proper adjustment of converters' duty ratios under different...
In this paper the 3-level integration PWM is developed to a simplified generalized PWM algorithm which can be used to control higher level photovoltaic (PV) inverters. The proposed algorithm is implemented practically by using eZdsp™ F28335 to control the multi-level DC-link inverter and to maintain the operation of input PV sources at their maximum power point (MPP). The inverter has been tested...
A strategy is presented for the control of a 4-limb flying-capacitor multi-level inverter (FCMI) as an active power filter for unbalanced load conditions. Improved reference tracking is achieved using a modified deadbeat controller, and a naturally-balanced 3DPWM technique enables sensor-less flying-capacitor voltage control. Simulation results show the effectiveness of the proposed scheme.
This paper addresses the problems of stability analysis and synthesis of uniform ultimate boundedness (UUB) control for a class of nonlinear switched difference systems. This kind of discrete-time systems could be regarded as the digitization systems induced from the corresponding continuous-time switched system in virtue of the numerical integration approach, such as Euler or Runge-Kutta method....
Sliding Mode Controller (SMC) can achieve good tracking performance and robustness to the disturbances, but SMC has worse stability and reliability than PID controller. As a most widely used controller, PID controller has many obvious advantages, but it has poorer tracking performance than SMC. In this paper, a hybrid control method of sliding mode and PID controllers is proposed to fully combine...
This paper presents an analysis of multiphase interleaved DC/DC converter by using state-space averaging technique. Consequently, steady-state and small-signal models of an N-phase interleaved converter are derived. Analysis of a two-phase interleaved step-up converter is demonstrated as an example along with its experimental verification.
The paper presents a comparative study of three different 3D-SVM techniques for the control of flying-capacitor multi-level inverters under both balanced and unbalanced operating conditions. Simulation results show that Direct 3D-SVM is the most efficient in computational effort. Application of this scheme to a three-level FCMI is simulated using the Alternative Transients Program (ATP). Output performance...
As a single-ring resonator is used for an optical cross-connect (OXC) switch, a large jitter of 30 ps and a low extinction ratio may occur due to delay and crosstalk. We propose a dual-drive, three-ring OXC, which exhibits a jitter of 8 ps and an extinction ratio of 20 dB.
This paper presents the operational analysis and performance comparison of various current-type Z-source inverters. With an X-shaped LC impedance network added, all current-type Z-source inverters can perform current buck-boost operation with expected output performance except of the case where modulation index is tuned to be lower than the physical boundary between linear modulation and distorted...
We consider the problem of scheduling in a multi- hop packet network so as to satisfy a set of arbitrary end-to-end delay requirements. A number of scheduling protocols are known for which end-to-end delay bounds can be derived. However, it is often the case that these end-to-end delay bounds are large for flows with small rate. This is clearly inappropriate for traffic types such as VoIP for which...
The paper presents a switching pattern selection scheme for the control of a multilevel flying capacitor inverter. The scheme reduces capacitor voltage fluctuation without using voltage feedback. The method is developed for sinusoidal voltage generation using the selective harmonic elimination (SHE) technique and was compared favorably with the result when voltage feedback was used.. The result of...
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