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Cognitive radio networks are attracting a lot of interest in wireless research community and industries which allow flexible use of utilized spectrum. The dynamic use of available spectrum bands needs proper spectrum handoff mechanism for switching to different operating frequencies based on vacant channels. Therefore, blocking probability, switching or handoff delay, link maintenance and failure...
Many control and monitoring applications including thermostats, doorbells, and security systems utilize 60 Hz transformers with grid-voltage inputs and 16 V to 24 V ac outputs. The new DOE Level VI efficiency standard places stringent requirements on the no-load quiescent loss of grid-interface power supplies, including these low-voltage transformers. This paper explores a low-cost but highly effective...
To fulfill the promises of wide band-gap (WBG) power transistors, circuit parasitics arising from the interconnection of these devices must be reduced through careful layout. While prior work has demonstrated guidelines for lateral, single-sided PCB layouts for half-bridges, this work presents the potential improvement in vertical, dual-sided designs by leveraging an electrically thin approach. Though...
An improved SiC MOSFET-gate driver integrated half-bridge module with folded layout using direct bonded copper (DBC) substrate is designed, fabricated, and tested. The bottom layer of the DBC is used as part of the power loop to achieve major reduction in the loop stray inductance. Due to the low parasitic inductance and capacitance, the gate resistor is chosen as zero to reduce the switching loss...
This study reports the design and experimental results of a fully-passive solid-state RF switch based on the Conductive Bridging Memory Technology, popularly known as CBRAM. The developed device is a shunt mode RF switch based on a Metal-Insulator-Metal (MIM) structure with Copper — Nafion — Aluminum switching layers on a Coplanar Waveguide (CPW) transmission line, operational in the DC to 3GHz range...
A new DBC-based hybrid packaging and integration method is proposed in this paper. A multilayer power module is formed by a direct-bond-copper (DBC) and a window cutting printed circuit board (PCB). The SiC chips and PCB are placed and soldering on the DBC. Al bonding wires are used for connecting the chips and the PCB. A full SiC half-bridge power module is designed and fabricated in compact size...
An area of printed electronics in which additional development is necessary is printable non-volatile memory, which will be essential for the development of fully printed RFID tags and sensors with integrated data storage.[1] An approach to making a printable memory is to utilize materials that exhibit resistive switching; devices based on this mechanism are often referred to as memristors.[2] However,...
This article describes a method of creating crossbar structures based on copper chloride and results of research such structures. It is shown that the obtained elements have a memristor properties. The used compound can provide better operation speed of elements in comparison with the materials studied earlier. The switching voltages of the investigated structures were 0.2 V and −0.25 V. Measured...
This paper focuses on the loss analysis and optimized design of DC-DC converter for battery module. By using the data measured from the experiment study of inductor loss and component datasheets to derive the inductor, MOSFET, and capacitor loss equations of bidirectional buck converter, boost converter, and buck-boost converter through numerical analysis. In addition, the charging and discharging...
Advancing the turn-off angle of the phase current of brushless direct current (BLDC) motors is a common control practice to improve their behavior and efficiency (reduction of current peaks, copper losses, and breaking torques). This paper investigates a refined switching strategy for a single-phase BLDC motor with bifilar winding to increase the energy conversion efficiency of the system. In addition...
Digital substation process bus-based solutions provide multiple benefits that can be used to improve personnel safety around high-voltage equipment, reduce electromagnetic interference challenges, and decrease substation construction costs. To realize these benefits, special attention must be given to the selection of the fiber-optic network architecture used for a process bus implementation. Network...
Switched reluctance generators (SRG) are a promising solution for back-up power generation for renewable energy or in electric vehicles. Classic approaches suggest choosing single pulse control angles to minimize dc-link rms current or excitation penalty to maximize system efficiency. Those publications only investigate the effect of turn-on angle θon and turn-off angle θoff. The influence of an additional...
This article proposes a 2D finite element model reduction that profits from one finite element solution of the machine modeling to find fast solutions in slots sub-domains when any variation of geometrical data occurred. It provides clear advantages in repetitive analyses when we search the optimized winding configuration for a given number of turns.
The paper conducts a simulation analysis on the electric field contribution of leading-out terminal based on the long running semi-insulating switchgear. The electric field distribution of leading-out terminal is obtained by using electrostatic field analysis with the software, ANSYS. The effects of water and dust are simulated by changing the dielectric constant of air considering the unpurified...
Due to the demand of emerging Cognitive Radio (CR) technology to permits using the unused licensed spectrum parts by cognitive users (CUs) to provide opportunistic and efficient utilisation of the white spaces. This requires deploying a CR MAC with the required characteristics to coordinate the spectrum access among CUs. Therefore, this paper presents the design and implementation of a novel Medium...
A novel multilayer stack Au/Cu/Au is proposed to increase the hardness of contact material of RF MEMS switch. The nanoindentation test results indicate that the hardness of Au/Cu/Au is 7 times higher than electroplated Au-film. The root-mean-square roughness of Au/Cu/Au is 13.7nm, while that of electroplated Au is 30.2nm. The pull-in voltage of the designed switch is 36.6V, the switch-on time is 39µs...
In this paper, beam tiling of an end-fire radiated Vivaldi antenna using a cantilever based frequency selective surface (FSS) is presented. The frequency reconfigurability of the cantilever FSS is used for the H-plane beam tilting of the Vivaldi antenna. 5-layers of 3×3 array of cantilever FSS are integrated in the front of the printed Vivaldi antenna to control its radiation. The simulation results...
In cognitive radio networks, cognitive users are allowed to use the licensed portions of spectrum, as long as no harmful interference affects the primary (licensed) users. Towards achieving this goal, spectrum sensing is an essential process to determine spectrum access opportunities for the cognitive users. In wide spectrum applications, it is recommended to distribute the sensing task of the required...
EMC requirements for scientific satellites are usually very stringent and much more demanding than terrestrial standards, mainly because ad-hoc scientific instruments developed for the mission require very quiet electromagnetic environments to perform their science. These requirements will assure the compatibility of all instruments on board and with the platform. The electromagnetic noise generated...
In the past year mini car has been increase in production, this type vehicle need low cost drive train and low maintenance. Motor Switched reluctance has many advantages this motor have lower manufacturing cost with low maintenance. In this paper Switched Reluctance Motor 6/4 is proposed based on sizing-motor procedure. Optimize process using design of experience (DoE) with manual iteration, the final...
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