scholarly journals Integrated Magnetics Design for a Full-Bridge Phase-Shifted Converter

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 183
Author(s):  
Yu-Chen Liu ◽  
Cheng-You Xiao ◽  
Chien-Chun Huang ◽  
Pei-Chin Chi ◽  
Huang-Jen Chiu
Keyword(s):  
Design Procedure ◽  
Optimization Procedure ◽  
Input Voltage ◽  
Magnetic Core ◽  
Magnetic Component ◽  
Time Interval ◽  
Integrated Magnetics ◽  
Conduction Loss ◽  
Maximum Conversion Efficiency ◽  
Circuit Loss

In this study, an optimization procedure was proposed for the magnetic component of an integrated transformer applied in a center-tap phase-shifted full-bridge converter. To accommodate high power–density 0demand, a transformer and an output inductor were integrated into a magnetic component to reduce the volume of the magnetic material and the primary and secondary windings of the transformer were wound on the magnetic legs to reduce conduction loss attributable to the alternating-current resistor. With a focus on the integrated transformer applied in a phase-shifted full-bridge converter, circuit operation in each time interval was analyzed, and a design procedure was established for the integrated magnetic component. In addition, the manner in which output inductance was affected by the mutual inductance between the transformer and the output inductor in the integrated transformer during various operation intervals was discussed and, to minimize circuit loss, a design optimization procedure for the magnetic core was proposed. Finally, the integrated transformer was applied in a phase-shifted full-bridge converter to achieve an input voltage of 400 V, an output voltage of 12 V, output power of 1.7 kW, an output frequency of 80 kHz, and a maximum conversion efficiency of 96.7%.

scholarly journals Analysis and Pareto Frontier Based Tradeoff Design of an Integrated Magnetic Structure for a CLLC Resonant Converter

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1756
Author(s):  
Gang Wang ◽  
Qiyu Hu ◽  
Chunyu Xu ◽  
Bin Zhao ◽  
Xiaobao Su
Keyword(s):  
Magnetic Structure ◽  
Power Density ◽  
High Efficiency ◽  
Pareto Frontier ◽  
Optimization Procedure ◽  
Magnetic Core ◽  
Pareto Optimization ◽  
High Power Density ◽  
Resonant Converter ◽  
Conduction Loss

This paper proposes an integrated magnetic structure for a CLLC resonant converter. With the proposed integrated magnetic structure, two resonant inductances and the transformer are integrated into one magnetic core, which improves the power density of the CLLC resonant converter. In the proposed integrated magnetic structure, two resonant inductances are decoupled with the transformer and can be adjusted by the number of turns in each inductance. Furthermore, two resonant inductances are coupled to reduce the number of turns in each inductance. As a result, the conduction loss can be reduced. The trade-off design of the integrated magnetic structure is carried out based on the Pareto optimization procedure. With the Pareto optimization procedure, both high efficiency and high-power density can be achieved. The proposed integrated magnetic structure is validated by theoretical analysis, simulations, and experiments.

scholarly journals A New Design Procedure for Rotor Laminations of Synchronous Reluctance Machines with Fluid Shaped Barriers

Electronics ◽  
2022 ◽  
Vol 11 (1) ◽  
pp. 134
Author(s):  
Federica Uberti ◽  
Lucia Frosini ◽  
Loránd Szabó
Keyword(s):  
Finite Element ◽  
Design Procedure ◽  
Optimization Procedure ◽  
Torque Ripple ◽  
Stator Winding ◽  
Post Processing ◽  
Processing Stage ◽  
Synchronous Reluctance Machine ◽  
Design And Optimization ◽  
Reluctance Machine

A new procedure for the design and optimization of the rotor laminations of a synchronous reluctance machine is presented in this paper. The configuration of the laminations is symmetrical and contains fluid-shaped barriers. The parametrization principle is used, which executes variations in the lamination geometry by changing the position, thickness and shape of the flux barriers. Hence, the optimization procedure analyzes the various configurations through finite element simulations, by means of the communication between MATLAB and Flux 2D. In the post processing stage, the best geometry which optimizes mean torque, torque ripple, efficiency and power factor is selected. Once the best rotor configuration is defined, further investigations allow improving its performance by modifying the current angle, the stator winding and the thickness of the radial ribs.

A Controllability-Based TO Approach for the Piezoelectric Actuator Design Considering Multimodal Vibration Control

2020 ◽  
pp. 2043009
Author(s):  
Juliano F. Gonçalves ◽  
Emílio C. N. Silva ◽  
Daniel M. De Leon ◽  
Eduardo A. Perondi
Keyword(s):  
Vibration Control ◽  
Active Vibration Control ◽  
Optimization Procedure ◽  
Linear Quadratic Regulator ◽  
Time Interval ◽  
Control Performance ◽  
Linear Quadratic ◽  
Main Work ◽  
Design Variables ◽  
Material Interpolation

This paper addresses the design problem of piezoelectric actuators for multimodal active vibration control. The design process is carried out by a topology optimization procedure which aims at maximizing a control performance index written in terms of the controllability Gramian, which is a measure that describes the ability of the actuator to move the structure from an initial condition to a desired final state in a finite time interval. The main work contribution is that independent sets of design variables are associated with each modal controllability index, then the multi-objective problem can be split into independent single-objective problems. Thus, no weighting factors are required to be tuned to give each vibration mode a suitable relevance in the optimization problem. A material interpolation scheme based on the Solid Isotropic Material with Penalization (SIMP) and the Piezoelectric Material with Penalization (PEMAP) models is employed to consider the different sets of design variables and the sensitivity analysis is carried out analytically. Numerical examples are presented by considering the design and vibration control for a cantilever beam and a beam fixed at both ends to show the efficacy of the proposed formulation. The control performance of the optimized actuators is analyzed using a Linear-Quadratic Regulator (LQR) simulation.

scholarly journals Modeling, Design Procedure and Control of a Low-Cost High-Gain Multi-Input Step-Up Converter

Electronics ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 1424
Author(s):  
Edgardo Netzahuatl ◽  
Domingo Cortes ◽  
Marco A. Ramirez-Salinas ◽  
Jorge Resa ◽  
Leobardo Hernandez ◽  
...  
Keyword(s):  
Nonlinear Model ◽  
Low Cost ◽  
Renewable Energy Sources ◽  
Design Procedure ◽  
Input Voltage ◽  
High Gain ◽  
Grid Systems ◽  
Real Behavior ◽  
Different Characteristics ◽  
And Control

The use of several different sources to feed a load jointly is convenient in many applications, in particular those where two or more renewable energy sources are employed. These applications include energy harvesting, hybrid vehicles, and off-grid systems. A multi-input converter able to admit sources of different characteristics and select the output power of each source is necessary in such applications. Several topologies of multi-input converters have been proposed to this aim; however, most of them are controlled by simple strategies based on a small signal model of multi-input converters. In this work, a low cost high gain step-up multi-input converter is analyzed. A nonlinear model is derived. Using this model, a detailed design procedure is proposed. A 500 W converter prototype was constructed to confirm that the model predicted the real behavior of the converter. Using the nonlinear model, indirect voltage control of basic converters was extended to the multi-input converter. The obtained controller had a fast performance, and it was robust under load and input voltage variations. With the obtained model, the proposed design procedure, and the controller, a converter that was initially proposed for photovoltaic applications was enabled to be used in a broader range of applications. The herein exposed ideas for modeling, the design procedure, and control could be also applied to other multi-input converters.

Optimal Manual Control for Heart Rate Tracking During Treadmill Exercises

2015 ◽  
Author(s):  
Mahmood Karimi ◽  
Ramesh R. Rao
Keyword(s):  
Heart Rate ◽  
Treadmill Exercise ◽  
Optimization Procedure ◽  
Nonlinear Dynamic System ◽  
Limited Attention ◽  
Time Interval ◽  
Piecewise Constant ◽  
Optimal Protocol ◽  
The Subject ◽  
Computer Controlled

Recently, a nonlinear dynamic system has been presented to model the heart rate (HR) response during and after treadmill exercise. The parameters of the model can be estimated and individualized. Based on the nonlinear model, several control techniques for the regulation of HR during treadmill exercise have been proposed. But commercial treadmills may not have equipments to be computer-controlled. In this paper, an optimal manual method is presented to track a predefined HR trajectory. A piecewise constant speed profile is considered as the input to the system and computed by an optimization procedure offline. The objective function is constituted in term of heart rate deviation from its desired. The subject must change manually the speed of the treadmill according to the optimal protocol periodically. The time interval between two speed changes should be long enough so that the subject is able to change the speed. Also, the proposed method is such that, limited attention for control is needed and the controller is not always active.

scholarly journals A new kind of solid-state Marx generator based on transformer type magnetic switches

2013 ◽  
Vol 31 (2) ◽  
pp. 239-248 ◽  
Author(s):  
Yu Zhang ◽  
Jinliang Liu
Keyword(s):  
Solid State ◽  
Life Time ◽  
Input Voltage ◽  
Magnetic Core ◽  
Marx Generator ◽  
Magnetic Switch ◽  
Transformer Type ◽  
In Series ◽  
New Type ◽  
High Level

AbstractIn this paper, a new kind of solid-state Marx generator based on synchronous transformer type magnetic switches (TTMS) is put forward, and the TTMSs with new winding structures are used to substitute all the spark gaps in the traditional Marx generator for the purposes of solidification and long life time. As the new type of TTMS with high step-up ratio and low saturated inductances is employed, the proposed Marx generator becomes a compact combination of pulse transformer, magnetic switch, and Marx capacitors. The stages of the Marx capacitors can be synchronously charged in parallel before the magnetic core saturates, and these Marx capacitors also can synchronously discharge in series. The establishing time of the proposed Marx generator is at ns range. As the new type of self-reset TTMS is used, the input voltage of the Marx generator decreases to a low level less than 1 kV while the output voltage can easily reach a high level ranging from dozens of kV to hundreds of kV.

scholarly journals Design and Optimization of a Composite Canard Control Surface of an Advanced Fighter Aircraft under Static Loading

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Sachin Shrivastava ◽  
P.M. Mohite
Keyword(s):  
Static Loading ◽  
Fiber Composite ◽  
Design Procedure ◽  
Optimization Procedure ◽  
High Strength ◽  
Control Surface ◽  
Carbon Fiber Composite ◽  
Ferrous Alloys ◽  
Fighter Aircraft ◽  
Elitist Strategy

AbstractThe minimization of weight and maximization of payload is an ever challenging design procedure for air vehicles. The present study has been carried out with an objective to redesign control surface of an advanced all-metallic fighter aircraft. In this study, the structure made up of high strength aluminum, titanium and ferrous alloys has been attempted to replace by carbon fiber composite (CFC) skin, ribs and stiffeners. This study presents an approach towards development of a methodology for optimization of first-ply failure index (FI) in unidirectional fibrous laminates using Genetic-Algorithms (GA) under quasi-static loading. The GAs, by the application of its operators like reproduction, cross-over, mutation and elitist strategy, optimize the ply-orientations in laminates so as to have minimum FI of Tsai-Wu first-ply failure criterion. The GA optimization procedure has been implemented in MATLAB and interfaced with commercial software ABAQUS using python scripting. FI calculations have been carried out in ABAQUS with user material subroutine (UMAT). The GA's application gave reasonably well-optimized ply-orientations combination at a faster convergence rate. However, the final optimized sequence of ply-orientations is obtained by tweaking the sequences given by GA's based on industrial practices and experience, whenever needed. The present study of conversion of an all metallic structure to partial CFC structure has led to 12% of weight reduction. Therefore, the approach proposed here motivates designer to use CFC with a confidence.

Front Structure Design Procedure for Optimal Pedestrian Leg Impact Performance

2004 ◽  
Author(s):  
Mark O. Neal
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Impact Test ◽  
Design Procedure ◽  
Optimization Procedure ◽  
Element Model ◽  
Structure Design ◽  
Baseline Design ◽  
Impact Performance ◽  
Front Structure

This paper describes a procedure to optimize the front structure of a vehicle for improved performance in the leg impact portion of pedestrian safety regulations proposed by the European Enhanced Vehicle-Safety Committee (EEVC). The first step in this procedure was to perform a simulation of the EEVC leg impact test with detailed finite element models of the EEVC leg impactor and the baseline design of a vehicle front structure. Next, a simplified, parametric finite element model of the vehicle front structure was used with the leg impactor model to simulate the leg impact test, and the results were correlated to the detailed finite element model and the test results. The leg impact simulation with the parametric vehicle model was then incorporated into an optimization procedure developed within the optimization code ISIGHT. In this procedure the parameters that controlled the vehicle geometry and structural stiffness in the simplified model were altered by ISIGHT to improve performance in the leg impact test.

scholarly journals Design Specifications and Performance analysis of Single and Two Stage HB LLC Converters

2019 ◽  
Vol 9 (1S) ◽  
pp. 192-196
Keyword(s):  
Performance Analysis ◽  
Software Package ◽  
Design Procedure ◽  
Input Voltage ◽  
Design Parameters ◽  
Basic Operation ◽  
Two Stage ◽  
Design Specifications ◽  
Converter Topologies ◽  
And Performance

In this paper a Single stage and Two stage Half Bridge LLC (HB LLC) converter topologies for DC/DC applications with low input voltage. The basic operation and design procedure for LLC converter is illustrated. Simulation of the proposed converter is done using the design parameters and the results are discussed and then analysis is done to know its performance. The efficiency of the converters is analyzed by MATLAB Software Package.

scholarly journals Adaptive On-Time Control Buck Converter with a Novel Virtual Inductor Current Circuit

Electronics ◽  
2021 ◽  
Vol 10 (17) ◽  
pp. 2143 ◽  
Author(s):  
Hsiao-Hsing Chou ◽  
Hsin-Liang Chen ◽  
Yang-Hsin Fan ◽  
San-Fu Wang
Keyword(s):  
Control Mechanism ◽  
Circuit Complexity ◽  
Design Procedure ◽  
Input Voltage ◽  
Cmos Technology ◽  
Buck Converter ◽  
Load Step ◽  
Time Control ◽  
Simulation Results ◽  
Step Down

This study presents a new virtual inductor current circuit to reduce circuit complexity, which is not necessary to sense inductance current directly. The buck converter was designed to produce an output voltage of 1.0–2.5 V for a 3.0–3.6 V input voltage. The load current range was from 100 mA to 500 mA. It was simulated and verified by SIMPLIS and MathCAD. The simulation results of this buck converter show that the voltage error is within 1%, and the recovery time is smaller than 2 ms for step-up and step-down load transients. Additionally, it achieves less than 26 mV overshoot at full-load step transient response. The circuit topology would be able to fabricate using TSMC 0.35 mm 2P4M CMOS technology. The control mechanism, implementation, and design procedure are presented in this paper.

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