Low-voltage, High-tuning Range MEMS Variable Capacitor Using Closed-loop Control

Low-voltage and high-current direct current (DC) power supplies are essential for aerospace and shipping. However, its robustness and dynamic response need to be optimized further on some special occasions. In this paper, a novel rectification system platform is built with the low-voltage and high-current permanent magnet synchronous generator (PMSG), in which the DC voltage double closed-loop control system is constructed with the backstepping control method and the sliding mode variable structure (SMVS). In the active component control structure of this system, reasonable virtual control variables are set to obtain the overall structural control variable which satisfied the stability requirements of Lyapunov stability theory. Thus, the fast-tracking and the global adjustment of the system are realized and the robustness is improved. Since the reactive component control structure is simple and no subsystem has to be constructed, the SMVS is used to stabilize the system power factor. By building a simulation model and experimental platform of the 5 V/300 A rectification module based on the PMSG, it is verified that the power factor of the system can reach about 98.5%. When the load mutation occurs, the DC output achieves stability again within 0.02 s, and the system fluctuation rate does not exceed 2%.

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Research on the HIL Platform of Photovoltaic Grid Connected System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.654.266 ◽

2014 ◽

Vol 654 ◽

pp. 266-269

Author(s):

Jian Xia Sun ◽

Da Qiang Bi ◽

Bao Ming Ge

Keyword(s):

Real Time ◽

Closed Loop ◽

Low Voltage ◽

Photovoltaic System ◽

Digital Controller ◽

Closed Loop Control ◽

Time Model ◽

Loop Control ◽

Low Voltage Ride Through ◽

Hardware In Loop

In order to analysis the characteristics of grid connected photovoltaic system, this paper proposes a Hardware-in-Loop (HIL) real time testing platform based on RT-LAB. The main circuit real time model is built in the RT-LAB, then connect the real time model with a DSP digital controller to achieve the double closed-loop control. And the HIL platform is used to analysis the low voltage ride through (LVRT) technology of grid connected photovoltaic under the of situation power grid fault. The experimental results validate the effectiveness and correctness of the model and the LVRT control strategy.

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Capacitive sensing circuit for closed-loop control of wide tuning range microspectrometers

10.1117/12.850589 ◽

2010 ◽

Cited By ~ 1

Author(s):

Mohamad Susli ◽

K. K. M. B. Dilusha Silva ◽

Farid Boussaid ◽

Lorenzo Faraone ◽

John M. Dell

Keyword(s):

Closed Loop ◽

Tuning Range ◽

Closed Loop Control ◽

Capacitive Sensing ◽

Wide Tuning Range ◽

Loop Control

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Research on Control Method and the Structure Design of Asynchronous Modular Contactor

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1008-1009.501 ◽

2014 ◽

Vol 1008-1009 ◽

pp. 501-504

Author(s):

Ming Zong ◽

Zheng Di Cao ◽

Tian Yu Dong

Keyword(s):

Structural Design ◽

Closed Loop ◽

Control Method ◽

Low Voltage ◽

Structure Design ◽

Closed Loop Control ◽

Electromagnetic System ◽

Loop Control ◽

And Control ◽

Main Factor

Contactors as low-voltage electrical products are largely used, contact bounce when contactor closing and arc which produces during opening is the main factor influencing a contactor’s life. This paper proposed a new structure that asynchronous modular, N-pole contactors consist of N independent contact systems, achieved each contact individually controlled by closed-loop control. This is a new idea in the field of structural design and control of contactors. This paper designed the structure size of the electromagnetic system, used Simulink software to build the model, studied dynamic characteristics of the contacts, and obtained a new closed-loop control method at last. This new method can effectively eliminate contact bounce when the contact closing and the arc generated when breaking, and increases the service life of the contactor.

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Closed-Loop Control of a New High Step-Up Multi-Input Multi-Output DC-DC Converter

International Journal for Research in Applied Science and Engineering Technology ◽

10.22214/ijraset.2021.38988 ◽

2021 ◽

Vol 9 (11) ◽

pp. 1281-1298

Author(s):

Dr. T. Murali Mohan

Keyword(s):

Closed Loop ◽

Low Voltage ◽

Power Converter ◽

Space Representation ◽

Closed Loop Control ◽

Loop Control ◽

State Space Representation ◽

Operating Modes ◽

Closed Loop Control System ◽

Loop Control System

Abstract: A new multi-input multi-output dc-dc converter with high step-up capability for wide power ranges is proposed in this paper. The converter's number of inputs and outputs is arbitrary and independent of each other. The proposed topology combines the benefits of DC-DC boost and switched-capacitor converters. The number of input, output, and voltage multiplier stages is arbitrary and depends on the design conditions. First, the various operating modes of the proposed converter are discussed. The closed-loop control system also must be designed using state space representation and small-signal modelling. Finally, the operation of the proposed converter is derived from the simulation results. Keywords: High power converter, Low voltage stress, Multi-Input Multi-Output (MIMO) converter, Non-isolated high step-up dc-dc converter, closed loop control.

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Closed-Loop Control System Design for Wireless Charging of Low-Voltage EV Batteries with Time-Delay Constraints

Energies ◽

10.3390/en14133934 ◽

2021 ◽

Vol 14 (13) ◽

pp. 3934

Author(s):

Viktor Shevchenko ◽

Bohdan Pakhaliuk ◽

Janis Zakis ◽

Oleksandr Veligorskyi ◽

Jaroslaw Luszcz ◽

...

Keyword(s):

Control System ◽

Time Delay ◽

Closed Loop ◽

Low Voltage ◽

Constant Current ◽

Closed Loop Control ◽

Transfer System ◽

Wireless Charging ◽

Power Transfer ◽

Loop Control

This paper presents an inductive power transfer system on the basis of a double single-phase three-level T-type inverter and two split transmitting coils for constant current and constant voltage wireless charging of low-voltage light electric vehicle batteries with closed-loop control, considering time-delay communication constraints. An optimal control structure and a modified control strategy were chosen and implemented to the wireless power transfer system as a result of a review and analysis of existing solutions. The control system analysis and adjustment of the coefficients of the regulator using Laplace transform were performed. Our study addressed the behavior of the control system with different time delays as well as the dynamic response of the system. The detecting algorithm of a secondary coil was proposed, which ensured efficient system operation and increased the functionality, safety and usability of the device. The efficiency of energy transfer of 90% was reached at the transmitted power of 110 W, which is at the level of existing solutions considered in the article and opens the way to the commercialization of the proposed solution. Therefore, the feasibility of using a nonclassical multilevel inverter, together with split transmitting coils for wireless charging was confirmed.

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The Impact of Visual Feedback Type on the Mastery of Visuo-Motor Transformations

Zeitschrift für Psychologie ◽

10.1027/2151-2604/a000084 ◽

2012 ◽

Vol 220 (1) ◽

pp. 3-9 ◽

Cited By ~ 4

Author(s):

Sandra Sülzenbrück

Keyword(s):

Empirical Research ◽

Visual Feedback ◽

Closed Loop ◽

Motor Planning ◽

Visual Input ◽

Closed Loop Control ◽

Loop Control ◽

Feedback Type ◽

Effective Use ◽

The Impact

For the effective use of modern tools, the inherent visuo-motor transformation needs to be mastered. The successful adjustment to and learning of these transformations crucially depends on practice conditions, particularly on the type of visual feedback during practice. Here, a review about empirical research exploring the influence of continuous and terminal visual feedback during practice on the mastery of visuo-motor transformations is provided. Two studies investigating the impact of the type of visual feedback on either direction-dependent visuo-motor gains or the complex visuo-motor transformation of a virtual two-sided lever are presented in more detail. The findings of these studies indicate that the continuous availability of visual feedback supports performance when closed-loop control is possible, but impairs performance when visual input is no longer available. Different approaches to explain these performance differences due to the type of visual feedback during practice are considered. For example, these differences could reflect a process of re-optimization of motor planning in a novel environment or represent effects of the specificity of practice. Furthermore, differences in the allocation of attention during movements with terminal and continuous visual feedback could account for the observed differences.

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