Open-Loop Synchronization Systems for Grid-Tied Power Converters: Literature Overview, Design Considerations, Advantages, and Disadvantages

2021 ◽  
pp. 2-10
Author(s):  
Saeed Golestan ◽  
Josep M. Guerrero ◽  
Yusuf Al-Turki ◽  
Abdullah Mohammad Abusorrah ◽  
Juan C. Vasquez
Keyword(s):  
Power Converters ◽  
Open Loop ◽  
Advantages And Disadvantages ◽  
Design Considerations ◽  
Literature Overview

Comparison of Dc-Dc SEPIC, CUK and Flyback Converters Based LED Drivers

2020 ◽  
pp. 99-107
Author(s):  
Erdal Sehirli
Keyword(s):  
Integrated Circuit ◽  
Closed Loop ◽  
Input Voltage ◽  
Open Loop ◽  
Current Sensor ◽  
Switching Frequency ◽  
Led Driver ◽  
Advantages And Disadvantages ◽  
Led Drivers ◽  
Conduction Mode

This paper presents the comparison of LED driver topologies that include SEPIC, CUK and FLYBACK DC-DC converters. Both topologies are designed for 8W power and operated in discontinuous conduction mode (DCM) with 88 kHz switching frequency. Furthermore, inductors of SEPIC and CUK converters are wounded as coupled. Applications are realized by using SG3524 integrated circuit for open loop and PIC16F877 microcontroller for closed loop. Besides, ACS712 current sensor used to limit maximum LED current for closed loop applications. Finally, SEPIC, CUK and FLYBACK DC-DC LED drivers are compared with respect to LED current, LED voltage, input voltage and current. Also, advantages and disadvantages of all topologies are concluded.

scholarly journals Intra-Abdominal Localisation of a Buschke-Lowenstein Tumour: Case Presentation and Review of the Literature

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
N. E. Wester ◽  
E. M. Hutten ◽  
C. Krikke ◽  
Robert A. Pol
Keyword(s):  
Interferon Therapy ◽  
Verrucous Carcinoma ◽  
Treatment Options ◽  
Condyloma Acuminata ◽  
Review Of The Literature ◽  
Case Presentation ◽  
Advantages And Disadvantages ◽  
Literature Overview ◽  
Mucosal Surfaces ◽  
Tumour Reduction

Giant condyloma acuminatum or Buschke-Lowenstein tumour is a very rare disease which usually is located in the genital, anorectal, and perianal regions. It is regarded as a type of verrucous carcinoma occurring on anogenital mucosal surfaces where it is locally invasive but displays a benign cytology. We describe a case of a 24-year-old woman with persisting condyloma acuminata progressing to a large intra-abdominal Buschke-Lowenstein tumour. To our knowledge such an advanced stage has only been reported once before. The severity and extent of the tumour both determine the treatment and patient outcome. Treatment was impeded by cachexia, an immunosuppressive state after kidney transplantation and difficulties in establishing a reliable diagnose. Interferon treatment was started which initially led to tumour reduction but was complicated by an interferon-induced pancreatitis, pneumonia, and fasciitis necroticans resulting in death. We present a literature overview on the treatment options for a Buschke-Lowenstein tumour, with emphasis on interferon therapy, with all the advantages and disadvantages.

An Optimized Magnet-Coil Force Actuator and Its Application to Precision Elastic Mechanisms

1990 ◽  
Vol 204 (4) ◽  
pp. 243-253 ◽  
Author(s):  
S T Smith ◽  
D G Chetwynd
Keyword(s):  
Short Range ◽  
Open Loop ◽  
Coil Design ◽  
Solenoid Coil ◽  
Positional Accuracy ◽  
Design Models ◽  
Design Considerations ◽  
Linear Spring ◽  
Magnet Coil ◽  
Better Than

Sprung translation mechanisms driven by electromagnetic force actuators are often used to produce controllable motions. This paper is concerned with one family of such devices incorporating linear spring mechanisms suitable for short-range, high-precision applications. In these, a permanent magnet is attached to the movable translating stage which is, in turn, surrounded by a solenoid coil attached to a fixed datum. Design considerations are discussed, principally an optimum dimensional design for a uniformly wound circular cylindrical coil. Design models are verified by the construction of a simple device in steel and aluminium which demonstrates an open-loop positional accuracy of better than 0.5 per cent over a displacement range of 100 nm to 50 μm.

scholarly journals Multi-Wavelength Analytical Ultracentrifugation of Biopolymer Mixtures and Interactions

2021 ◽  
Author(s):  
Borries Demeler ◽  
Amy Henrickson ◽  
Gary Gorbet ◽  
Alexey Savelyev ◽  
Minji Kim ◽  
...  
Keyword(s):  
Small Molecules ◽  
Analytical Ultracentrifugation ◽  
Optical Systems ◽  
Hydrodynamic Properties ◽  
Advantages And Disadvantages ◽  
Design Considerations ◽  
Free Dna ◽  
Wide Range ◽  
Analysis Strategies ◽  
Multi Wavelength

Abstract Multi-wavelength analytical ultracentrifugation (MW-AUC) is a recent development made possible by new analytical ultracentrifuge optical systems. MW-AUC is suitable for a wide range of applications and biopolymer systems and is poised to become an essential tool to characterize macromolecular interactions. It adds an orthogonal spectral dimension to the traditional hydrodynamic characterization by exploiting unique chromophores in analyte mixtures that may or may not interact. Here we illustrate the utility of MW-AUC for representative classes of challenging biopolymer systems, including interactions between mixtures of different sized proteins with small molecules, mixtures of loaded and empty viral AAV capsids contaminated with free DNA, and mixtures of different proteins, where some have identical hydrodynamic properties, all of which are difficult to resolve with traditional AUC methods. We explain the improvement in resolution and information content obtained by this technique compared to traditional single- or dual-wavelength approaches. We discuss experimental design considerations and limitations of the method, and address the advantages and disadvantages of the two MW optical systems available today, and the differences in data analysis strategies between the two systems.

A Motion Analysis for one D.O.F. Anthropomorphic Finger Mechanism

1998 ◽  
Author(s):  
Giorgio Figliolini ◽  
Marco Ceccarelli
Keyword(s):  
Computer Simulation ◽  
Motion Analysis ◽  
Kinematic Chain ◽  
Open Loop ◽  
Kinematic Structure ◽  
Design Considerations ◽  
Human Finger ◽  
And Control

Abstract A novel kinematic structure of a tendon-driven mechanism is proposed for an anthropomorphic finger mechanism of artificial hands. The kinematic structure is composed by three links as the three phalanges of a human finger and they are moved independently by means of suitable endless tendons. The three d.o.f.s of the proposed open-loop kinematic chain have been appropriately reduced to only one in order to simplify the actuation and control of the finger mechanism. A motion analysis has been carried out by using the polode method to obtain a suitable algorithm for computer simulation. The grasp performances of the proposed new anthropomorphic finger mechanism have been investigated and some design considerations have been pointed out.

Convergence of PD-Type Iterative Learning Control of Nonlinear Discrete Systems and its Robustness

2012 ◽  
Vol 557-559 ◽  
pp. 2049-2053
Author(s):  
Chang Liang Liu ◽  
Wan Gen Jia
Keyword(s):  
Iterative Learning Control ◽  
Closed Loop ◽  
Discrete Systems ◽  
Open Loop ◽  
Iterative Learning ◽  
System Operation ◽  
Advantages And Disadvantages ◽  
Output Error ◽  
The Status ◽  
Nonlinear Discrete Systems

Abstract: For the control problem of nonlinear discrete systems, this paper describes the status of current research and analyzes the advantages and disadvantages of open-loop and closed-loop iterative learning controller. A class of nonlinear discrete systems will be extended to the general nonlinear discrete systems. To the general nonlinear discrete systems, a open-closed-loop PD-type iterative learning controller which based on current and last output error instead of last output error only is proposed. It makes use of information on system operation more fully and accurately. Besides, based on norm of λ and mathematical induction, its sufficient condition for convergence is given. In order to test its robustness, a simulation is done in the case of a persistent interference. Simulation results show that it is efficient.

scholarly journals Design considerations for high‐power converters interfacing 10 MW superconducting wind power generators

2017 ◽  
Vol 10 (12) ◽  
pp. 1461-1467 ◽  
Author(s):  
Francisco Vedreño‐Santos ◽  
Milijana Odavic ◽  
Yang Guan ◽  
Ziad Azar ◽  
Arwyn Sean Thomas ◽  
...  
Keyword(s):  
Wind Power ◽  
High Power ◽  
Power Converters ◽  
Power Generators ◽  
Design Considerations ◽  
Wind Power Generators

ADAPTIVE OPEN-PLUS-CLOSED-LOOP CONTROL METHOD OF MODIFIED FUNCTION PROJECTIVE SYNCHRONIZATION IN COMPLEX NETWORKS

2011 ◽  
Vol 22 (12) ◽  
pp. 1393-1407 ◽  
Author(s):  
HONGYUE DU
Keyword(s):  
Closed Loop ◽  
Control Method ◽  
Open Loop ◽  
Projective Synchronization ◽  
Closed Loop Control ◽  
Loop Control ◽  
Function Projective Synchronization ◽  
Advantages And Disadvantages ◽  
Modified Function Projective Synchronization ◽  
Loop Feedback

This paper investigates the modified function projective synchronization (MFPS) in drive-response dynamical networks (DRDNs) with different nodes, which means that systems in nodes are strictly different. An adaptive open-plus-closed-loop (AOPCL) control method is proposed, which is a practically realizable method and can overcome the model mismatched to achieve synchronization. It is well known that each of the close-loop and open-loop control method possesses some advantages and disadvantages. By combining their advantages, the open-plus-closed-loop (OPCL) control method was proposed by Jackson and Grosu. For arbitrary nonlinear dynamic systems, dx/dt = F(x,t), Jackson and Grosu proved that there exists solutions, x(t), in the neighborhood of any arbitrary goal dynamics g(t) that are entrained to g(t), through the use of an additive controlling action, K(g,x,t) = H(dg/dt,g) + C(g,t)(g(t) - x), which is the sum of the open-loop action, H(dg/dt,g), and a suitable linear closed-loop (feedback) action C(g,t). This method is a practically realizable method and robust to limited accuracy of data and effects of noise. The AOPCL control method preserve the merits of OPCL control method and its closed loop control part can be automatically adapted to suitable constants. Considering time-delays are always unavoidably in the practical situations, MFPS in DRDNs with time-varying coupling delayed is further investigated by the proposed method. Corresponding numerical simulations are performed to verify and illustrate the analytical results.

Sign in / Sign up

Export Citation Format

Share Document