This paper has presented a comprehensive analytical method for designing LCL filter of a three-phase power factor correction rectifier (PFC). The method is explained by the converter current and the voltage behavior. The converter current ripple determines all the filter parameters and defines a suitable margin for them. A general …
Read More »Enhancing Power Transformer Differential Protection to Improve Security and Dependability
The transformer percent differential protection is not reliable enough during external fault. if the differential restraint characteristic is the only one criteria providing security. The saturation of CTs during external faults could lead to cases of dangerously high differential restraint ratios crossing the characteristic into the operating region and causing …
Read More »3.0-3.6 GHz Wideband . over 46% Average Efficiency GaN Doherty Power Amplifier with Frequency Dependency Compensating Circuits
To realize the wideband DPA above 3GHz. the frequency dependency compensating circuit and the λ ۴ inverter incorporating parasitic elements inside package were proposed. The feasibility of the approach was verified by measurement results. and it achieved 45.9- 50.2 % drain efficiency with -50 dBc ACLR over the 3.0- 3.6 …
Read More »A New Mover Separated Linear Magnetic-Field Modulated Motor for Long Stroke Applications
In this paper. a novel MS-LMFM motor has been proposed and several varied geometric parameters have been optimized for maximum thrust force. Furthermore. a comparison between the proposed and existing motor has been carried out under fixed copper loss by FE method. Compared with the existing motor. it is confirmed …
Read More »A New Battery Charger for Plug-in Hybrid Electric Vehicle Application using Back to Back Converter in a Utility Connected Micro-grid
The feasibility and performance of a battery charger for PHEV application using back to back (B2B) converter in a utility connected micro-grid has been investigated in this paper. A structure has been proposed involving three parts: an AC micro-grid. in which the load is fed from the DG source. a …
Read More »Investigation of Energy Savings on Industrial Motor Drives Using Bidirectional Converters
Motor drives is a widely used technology. offering many advantages. such as exceptional speed control and flexibility. Improvement of reliability and efficiency has become a great research interest. Toward this direction and considering the major recent developments in supercapacitor technology. the use of bidirectional energy recovery converters has been introduced …
Read More »Introducing the Internet of Things Department
The following is an example of one type of article we’d like to showcase. It’s a report based on a two-hour panel discussion on IoT in healthcare. held at the NIST offices in Gaithersburg. Maryland on 30 August 2017. The panel was part of a one-day workshop on IoT sensors …
Read More »High-Voltage 12.5-V Backside-Illuminated CMOS Photovoltaic Mini-Modules
This paper presents a high-voltage CMOS PV mini-module fabricated using a one-step LSR process. The proposed PV mini-module features adjustable (0.5 to 12.5V) open-circuit voltage and µA-scale short-circuit current in a small form factor with a specific open-circuit voltage <.Voc>. of 3.13 V mm2. Only 25 on-chip PV cells were …
Read More »Improved ant colony algorithm for adaptive frequency-tracking control in WPT system
In this paper. an IACA has been proposed. and the pheromones of the path are adaptively adjusted to avoid the local optimum. Simulation results based on MATLAB verified the feasibility of the proposed algorithm. The IACA has good robustness. and can be used in an AFTC system. which varies its …
Read More »Electromagnetic Characteristic Analysis and Optimization Design of a Novel HTS Coreless Induction Motor for High Speed Operation
In this paper. a novel HTS CIM was studied based on the minimization of the torque ripple and the perpendicular magnetic field component to the tape surface. The results shows that the performance of HTS materials is still not fully developed. but also needs further optimization. Based on the initial …
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