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Showing 2 results for Mehri

Mr. Hossein Mehri, Mr. Bijan Alizadeh,
Volume 13, Issue 4 (Vol.13 No.4 2017)
Abstract

Optimizing FPGA architectures is one of the key challenges in digital design flow. Traditionally, FPGA designers make use of CAD tools for evaluating architectures in terms of the area, delay and power. Recently, analytical methods have been proposed to optimize the architectures faster and easier. A complete analytical power, area and delay model have received little attention to date. In addition, previous works use analytical methods to optimize general-purpose FPGA architectures. Using analytical models for optimizing application-specific FPGA architectures are interesting subjects in the reconfigurable computing field. In this way, designers can investigate the optimized architecture for a set of application circuits and the consumers can find their best architecture among a variety of devices which is optimal for their specific work. In this paper, we complete an analytical FPGA performance model by presenting an analytical model to estimate the dynamic and leakage power and by integrating it into the Geometric Programming framework where the area and performance models exist. This way, we are able to rapidly analyze various FPGA architectures and select the best one in terms of power consumption as well as area and delay. In the next step, we extend the model for optimizing FPGA architectures for a set of applications. A case of the best architecture for two specific circuits has been investigated in this paper.


Dr. Mansour Rafiee, Saeed Amiri Shadmehri,
Volume 20, Issue 2 (JIAEEE Vol.20 No.2 2023)
Abstract

This paper presents a dynamic uninterruptible power supply (DUPS) consisting of both battery and flywheel energy storage systems with the aim of overcoming power quality problems such as temporary voltage drop and power outages. To supply a critical load at the moment of fault occurrence and a few seconds later, the flywheel energy storage system(FESS) and for a few minutes after that or in the case of power outage, the battery storage system and after that, a diesel generator are used respectively. The FESS system consists of a bidirectional inverter, a flywheel and an interior permanent magnet synchronous motor (IPMSM). In the IPMSM control scheme, vector control, torque maximization per ampere(MTPA) and field weakening technics are used. The battery energy storage system consists of a bidirectional DC / DC buck-boost converter and a charge-discharge control. The simulation results show that the FESS changes from standstill to charged and standby condition in less than10  seconds and is ready to supply critical load for short-term phenomena. In UPS mode, it also maintains the critical load voltage at the nominal value in less than one cycle. In the event of a long-term power outage, after discharging the flywheel energy for about 2 seconds, the battery energy storage system maintains the DC link voltage at its reference value and provides the necessary time to start the diesel generator.


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