scholarly journals A Method for Selection of Power MOSFETs to Minimize Power Dissipation

Electronics ◽  
2021 ◽  
Vol 10 (17) ◽  
pp. 2150
Author(s):  
Utkarsh Jadli ◽  
Faisal Mohd-Yasin ◽  
Hamid Amini Moghadam ◽  
Peyush Pande ◽  
Mayank Chaturvedi ◽  
...  
Keyword(s):  
Power Dissipation ◽  
Optimization Method ◽  
Power Converter ◽  
Specific Power ◽  
Maximum Efficiency ◽  
Active Device ◽  
Simple Method ◽  
Power Circuit ◽  
Power Mosfet ◽  
Specific Device

A balance between static and dynamic losses of a power MOSFET is always desirable for accomplishing the maximum efficiency for a specific power converter. The standard semiconductor theory suggests that a minimum power dissipation in a MOSFET can be achieved by selecting a specific device active area. However, for power circuit designers, the active device area is unknown given that only datasheet parameters are available. Hence, in this paper, we propose a simple method, based on semiconductor theory, to select optimum power MOSFET from a family of MOSFETs using only datasheet parameters. By applying this optimization method to the specific power supply circuit under development, power engineers can select the best transistors to yield lowest power losses for the systems under development.

Prediction of Performance and Design via Optimization of Ducted Propellers Subject to Non-axisymmetric Inflows

2005 ◽  
Author(s):  
Spyros A. Kinnas ◽  
Hanseong Lee ◽  
Hua Gu ◽  
Yumin Deng
Keyword(s):  
Nonlinear Optimization ◽  
Pressure Coefficient ◽  
Optimization Method ◽  
Least Square ◽  
Maximum Efficiency ◽  
Design Parameters ◽  
Blade Design ◽  
Constrained Nonlinear Optimization ◽  
Nonlinear Optimization Method ◽  
Ducted Propellers

Recently developed methods at UT Austin for the analysis of open or ducted propellers are presented, and then coupled with a constrained nonlinear optimization method to design blades of open or ducted propellers for maximum efficiency satisfying the minimum pressure constraint for fully wetted case, or the specified maximum allowable cavity area for cavitating case. A vortex lattice method (named MPUF3A) is applied to analyze the unsteady cavitating performance of open or ducted propellers subject to non-axisymmetric inflows. A finite volume method based Euler solver (named GBFLOW) is applied to predict the flow field around the open or ducted propellers, coupled with MPUF-3A in order to determine the interaction of the propeller with the inflow (i.e. the effective wake) or with the duct. The blade design of open or ducted propeller is performed by using a constrained nonlinear optimization method (named CAVOPT-BASE), which uses a database of computed performance for a set of blade geometries constructed from a base-propeller. The performance is evaluated using MPUF-3A and GBFLOW. CAVOPT-BASE approximates the database using the least square method or the linear interpolation method, and generates the coefficients of polynomials based on the design parameters, such as pitch, chord, and camber. CAVOPT-BASE finally determines the optimum blade design parameters, so that the propeller produces the desired thrust for the given constraints on the pressure coefficient or the allowed amount of cavitation.

scholarly journals A simple interferometric method to measure the calibration factor and displacement amplification in piezoelectric flextensional actuators

2010 ◽  
Vol 21 (6) ◽  
pp. 577-587 ◽  
Author(s):  
Francisco de Assis Andrade Barbosa ◽  
Gilder Nader ◽  
Ricardo Tokio Higuti ◽  
Cláudio Kitano ◽  
Emílio Carlos Nelli Silva
Keyword(s):  
Modulation Depth ◽  
Low Cost ◽  
Michelson Interferometer ◽  
Laser Interferometry ◽  
Optimization Method ◽  
Calibration Factor ◽  
Simple Method ◽  
Interferometric Method ◽  
Established Technique

Laser interferometry is a well-established technique for the characterization of piezoelectric actuators. In this work, by using a low cost Michelson interferometer, the measurement of the calibration factor and the displacement amplification of a novel piezoelectric flextensional actuator (PFA), designed by using the topology optimization method, is performed. A simple method, based on small phase modulation depth when the PFA is driven by a triangular waveform, allows the absolute interferometer calibration. The free-displacement of the PFA for various drive voltages is measured and the displacement amplification is determined. The linearity and frequencyresponse of the PFA are evaluated up to 20 kHz

scholarly journals Asymmetrical ZVS-PWM Switched-Capacitor Based Half-Bridge DC-DC Converter With Switch Peak Voltage of Vin/2

2020 ◽  
Author(s):  
Angelica Paula Caus ◽  
Guilherme Martins Leandro ◽  
Ivo Barbi
Keyword(s):  
Theoretical Analysis ◽  
Power Converter ◽  
Maximum Efficiency ◽  
Switching Frequency ◽  
Switched Capacitor ◽  
Peak Voltage ◽  
Zero Voltage Switching ◽  
Power Switches ◽  
Converter Topology ◽  
Bus Voltage

This paper presents a new power converter topology<br>generated by the integration of the asymmetrical ZVS-PWM dcdc converter with a switched-capacitor ladder-type commutation<br>cell. Circuit operation and theoretical analysis with emphasis on<br>the soft-commutation process are included in the paper. The<br>main advantage of the proposed converter with respect to the<br>conventional asymmetrical half-bridge dc-dc converter is the<br>reduction of the voltage stress across the power switches to the<br>half of the input dc bus voltage, enabling the utilization of lower<br>voltage rating components. Experiments conducted on a<br>laboratory prototype with 1.4 kW power-rating, 800 V input<br>voltage, 48 V output voltage and 100 kHz switching frequency<br>are included, to verify the theoretical analysis and the design<br>methodology. The maximum efficiency of the experimental nonoptimized prototype was 93.6%.<br>Index Terms - Asymmetrical dc-dc converter, pulse-widthmodulation, switched-capacitor, zero voltage switching.<div><br><br></div>

Design of Optimal CMOS Analog Amplifier Circuits Using a Hybrid Evolutionary Optimization Technique

2017 ◽  
Vol 27 (02) ◽  
pp. 1850029 ◽  
Author(s):  
Bishnu Prasad De ◽  
Kanchan Baran Maji ◽  
Rajib Kar ◽  
Durbadal Mandal ◽  
Sakti Prasad Ghoshal
Keyword(s):  
Power Dissipation ◽  
Optimization Problems ◽  
Optimization Technique ◽  
Optimization Method ◽  
Vlsi Circuits ◽  
Optimal Designs ◽  
Efficient Design ◽  
Mos Transistors ◽  
Evolutionary Technique ◽  
Random Particle

This paper proposes an efficient design technique for two commonly used VLSI circuits, namely, CMOS current mirror load-based differential amplifier circuit and CMOS two-stage operational amplifier. The hybrid evolutionary method utilized for these optimal designs is random particle swarm optimization with differential evolution (RPSODE). Random PSO utilizes the weighted particles for monitoring the search directions. DE is a robust evolutionary technique. It has demonstrated an exclusive performance for the optimization problems which are continuous and global but suffers from the uncertainty issues. PSO is a robust optimization method but suffers from sub-optimality problem. This paper effectively hybridizes the random PSO and DE to remove the limitations related to both the techniques individually. In this paper, RPSODE is employed to optimize the sizes of the MOS transistors to reduce the overall area taken by the circuit while satisfying the design constraints. The results obtained from RPSODE technique are validated in SPICE environment. SPICE-based simulation results justify that RPSODE is a much better technique than other formerly reported methods for the designs of the above mentioned circuits in terms of MOS area, gain, power dissipation, etc.

Modeling and Simulation of MPPT-SEPIC Combined Bidirectional Control Inverse KY Converter Using ANFIS in Microgrid System

2016 ◽  
Vol 1 (2) ◽  
pp. 264 ◽  
Author(s):  
Soedibyo Soedibyo ◽  
Farid Dwi Murdianto ◽  
Suyanto Suyanto ◽  
Mochamad Ashari ◽  
Ontoseno Penangsang
Keyword(s):  
Energy Storage ◽  
Output Power ◽  
Distribution System ◽  
Maximum Output Power ◽  
Optimization Method ◽  
Photovoltaic System ◽  
Maximum Efficiency ◽  
Maximum Output ◽  
Pv System ◽  
Excess Power

<em>Photovoltaic system (PV) is widely used in various renewable energy application. The main problem of PV system is how to get the maximum output power which is integrated in microgrid system. Furthermore, the redundancy output power generated by on a distribution system should also be considered. This study utilizes the excess power for energy storage using bidirectional of KY inverse</em> <em>converter. Since the DC voltage which generated by PV and the energy storage will be converted into AC voltage using inverter toward load. This paper proposes ANFIS as search optimization method using SEPIC converter with a maximum efficiency of 99.95%</em> to impact to power generation performance  in microgrid system.

scholarly journals Two-Stage Optimization Method for Efficient Power Converter Design Including Light Load Operation

2012 ◽  
Vol 27 (3) ◽  
pp. 1327-1337 ◽  
Author(s):  
Ruiyang Yu ◽  
Bryan Man Hay Pong ◽  
Bingo Wing-Kuen Ling ◽  
J. Lam
Keyword(s):  
Optimization Method ◽  
Power Converter ◽  
Two Stage ◽  
Light Load ◽  
Converter Design ◽  
Efficient Power

Cross sectional Tem Sample Preparation Using E-Beam Lithography and Reactive ion Etching

1997 ◽  
Vol 480 ◽  
Author(s):  
Hyun-Jin Cho ◽  
Peter B. Griffin ◽  
James D. Plummer
Keyword(s):  
Electron Microscopy ◽  
Reactive Ion Etching ◽  
High Resolution Electron Microscopy ◽  
Ion Milling ◽  
Cross Sectional ◽  
Simple Method ◽  
Ion Etching ◽  
Resolution Electron ◽  
Specific Device ◽  
Short Time

AbstractA simple method to make cross sectional TEM samples of Si and GaAs semiconductor devices at specific device locations using electron beam (e-beam) lithography and reactive ion etching is described. The basic idea of this technique is to form pillar or line type patterns thin enough to be transparent to electron beams used in transmission electron microscopy. Since the entire process is conducted in the semiconductor fabrication facility, reliable samples were efficiently obtained within a short time without mechanical polishing or ion milling. High Resolution Electron Microscopy (HREM) images of SiGe and GaAs multilayer structures were obtained by this method. Using the alignment function of the e-beam lithography system, cross sectional TEM samples at specific locations of MOS transistors were obtained. The samples were thin enough to obtain HREM images of atomic level defects in the device.

The Thermal Efficiency of a Hand-Fired Natural-Draught Lancashire Boiler

1950 ◽  
Vol 162 (1) ◽  
pp. 20-26
Author(s):  
T. F. Hurley ◽  
W. J. Sparkes
Keyword(s):  
Thermal Efficiency ◽  
Considerable Increase ◽  
Heat Losses ◽  
Flue Gases ◽  
Maximum Efficiency ◽  
Research Station ◽  
Simple Method ◽  
Excess Air ◽  
Secondary Air ◽  
High Level

Following the development of the Fuel Research Station “smoke eliminator” fire doors for hand-fired, natural-draught Lancashire boilers, a series of trials was carried out to obtain figures for their performance under a variety of conditions. Most of the trials were made with one or other of two sizes (”singles” and “smalls”) of a Northumberland coal, which was chosen because of its tendency to make heavy smoke; similar results were obtained with both sizes. The figures obtained during these trials, together with those of a few supplementary trials, are used to illustrate the effects of certain variables upon the performance of a boiler of that type. The information presented includes (1) the correlation of smoke intensity with the composition of the flue gases and with thermal efficiency, (2) the use of secondary air and suitable methods of firing to reduce the heat losses caused by incomplete combustion, (3) the effect of too little and of too much excess air upon efficiency, and (4) the effect of load upon efficiency. With the special fire doors, the admission of secondary air over the fire could easily be controlled and a simple method of firing could be employed. In consequence, the efficiency of combustion was maintained at a consistently high level without calling for exceptional skill or effort on the part of the fireman. Maximum efficiency was obtained when the quantity of secondary air was just sufficient to eliminate smoke: decreasing the percentage of excess air by a small amount below the optimum had as bad an effect upon efficiency as a considerable increase. Varying the load also affected efficiency, the maximum being reached well below rated load, but the variation in efficiency between 40 and 100 per cent of full load was comparatively small.

Processing Map for Hot Deformation of Homogenized AZ61 Mg Alloy

2013 ◽  
Vol 716 ◽  
pp. 240-243 ◽  
Author(s):  
Ching Hao Liao ◽  
Horng Yu Wu ◽  
Shyong Lee ◽  
Cheng Tao Wu ◽  
Chui Hung Chiu
Keyword(s):  
Power Dissipation ◽  
Processing Map ◽  
Flow Instability ◽  
Local Maximum ◽  
Mg Alloy ◽  
Deformation Condition ◽  
Maximum Efficiency ◽  
Processing Maps ◽  
Compression Tests ◽  
Az61 Mg Alloy

Based on the experimental results from the hot compression tests of homogenized cast AZ61 Mg alloy, processing maps were constructed by superimposition of the instability maps over the power dissipation maps. The domain with the efficiency of power dissipation reaching a local maximum and flow instability region were identified in the processing maps. The processing map obtained at a strain of 0.6 exhibited only one domain with local maximum efficiency of power dissipation. The microstructure observations showed that variation in microstructure was related to the deformation condition, which was associated with the variation in efficiency of power dissipation.

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