The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper, a wireless telemetry using the near-field coupling technique with round-wire coils for an implanted pacemaker is presented. The proposed system possesses an external powering amplifier and an internal bidirectional microstimulator. Even with a low induced voltage, all the circuitries associated with the implantable stimulator are operated normally by the coupling power interface, which...
Based on the background of battery charging system, in this paper, the small-signal equivalent circuit model of phase-shifted full-bridge ZVS DC/DC converter is established, then its transfer function is derived, and a single closed-loop voltage-mode controller is designed. In order to analyze anti-grid voltage disturbance capacity, transfer function of audio susceptibility is presented, and the anti-grid...
The basic advantage of stepper motors over other types of motors is that it can be driven by digital and open-loop control. However an open loop control shows a poor dynamic performance and is insufficient in precise motions which require a high dynamic, so a closed loop control is required. This paper describes field oriented control which will improve the dynamic performance of the Hybrid stepper...
In order to deal with the control difficulties of the dredger's dynamic positioning system under large disturbances caused by dredging operation, a disturbances compensating dynamic surface control method is proposed to be used in the dredger's dynamic positioning system. Disturbances can be measured and compensated by the adding forces sensors. The proposed robust controller guarantees the semi-globally...
The research on the application of the 3-phase high power PWM (Pulse Width Modulation) rectifier in the battery charge and discharge device has been a hotspot in the field of power electronics and control. As the traditional PID controller is difficult to achieve the optimum parameters, this paper proposes a new control method of PWM rectifier based on Genetic Algorithm (GA). The design of the PWM...
By the test, this paper analyzed the position gain of the NC machine tool servo system controlled by the closed-loop impact on position error, steady-state errors. It provides an important basis for improving the impact on Servo system's follow performance, inertia, dead zone and other factors in the machining process of high-speed and high-precision.
In this paper, a program-controlled current source system which is based on direct digital frequency synthesis technology has been proposed. The system adopts PIC16F877 microcontroller as the control center, chooses the AD9850 chip to achieve the program. Through closed-loop design, software use discrete incremental digital PID algorithm to realize precise control of output current system of small...
The use in actual project, the basic structure and working process of the drop hammer are introduced in this paper, and the problems of the traditional manual control are also analyzed. A drop hammer device control system based on PLC is proposed after analyzing the working process in details. The absorption and release of the drop hammer is realized through the power control of the electromagnet...
Against the issue about revenue maximization of cycle project product, apply ideas of game balance, base on a single product manufacturers and retailers in closed-loop system, study when recycling waste products, decentralized decision-making model and a joint pricing strategies of enterprises; In considering the environmental costs of products, proposed differential pricing policy model in product...
To make an analysis on the output exists oscillation of inverter Fuzzy control system, this paper focuses on the digital signal processor (DSP), brings variable universe into Fuzzy self-tuning PID control structure, and put forward a Fuzzy self-tuning PI double closed loop inverter controller based on variable universe, so as to achieve an online adaptive stretching changes of Fuzzy universe. The...
On the basis of robust H∞ control, the output feedback controller is presented for a class of dynamic time-varying delay network systems. The objective of designing robust H∞ controller is to achieve the desired queue size and to guarantee the asymptotic stability of the close-loop. The sufficient condition for the existence of a dynamic output feedback controller is presented via matrix inequalities...
A crank slide-way mechanism is a kind of mechanisms between crank slide mechanisms and crank rocker mechanisms, the main difference is that: in the same case of taking uniform speed as input, the output is neither linear displacement nor the arc path, but a specifically curve. So in some cases, A complex output path can be realized when kinematical curves with special shapes have been accepted. The...
According to the requirements of a DC motor speed control system, a Dual-Closed-Loop Speed Regulator has been designed, with the AT89C51 and TMS320LF2407A is the MCU of this regulator. The function of TMS320LF2407A is sampling and regulating the speed of the DC motor, and the function of AT89C51 is inputting and displaying the speed of the DC motor. The hardware block diagram, program charts, and...
Modelling and simulation of closed loop controlled class D current source resonant inverter (CSRI) for ferromagnetic load is presented in this paper. The converter can operate effectively even for fluctuating source and it operates in zero-current switching mode. The switching devices are connected through a common ground and need only a single DC power supply for the gate driver circuitry. The aim...
We used to crank connecting shaft neck in the center of the neck as the origin of work piece coordinate system. Through the offset of the work piece coordinate, we made use of the method of the coordinate value in keeping with the real coordinate diameter or the relative location value of the work piece center. We designed a kind of crankshaft NC dresser which consists of the Siemens servo semi-closed...
The design and experimental characterization of a novel electronic control unit for fly-by-wire aircraft actuators are presented. Thanks to a carefully-engineered compact volume, it is embedded in the actuator body, providing local closed-loop control. Various digital control laws can be implemented in the easily reconfigurable digital platform. After system modeling and tuning, a variable-gain controller...
Modeling, control and analysis of an automatic control system for managing the power output of large multielement hyperthermia applicator heated by microwave applied to tissue equivalent phantom is simulated. The modeling of tissue equivalent phantom is done by Pennes bioheat transfer equation. Classical implicit method is used to arrive at the state space model of the system. In hyperthermia it is...
This paper presents the theoretical analysis, design and simulation of a single phase single stage boost dc-ac converter powered from PV array. The main attribute of the boost inverter topology is the fact that it generates an ac output voltage larger than the dc input one, depending on the instantaneous duty cycle. This paper proposes an accurate solar panel simulation to incorporate the temperature...
This kind of control systems wherein the control loops are closed through a real time communication network can be called networked control systems. Networked control system is a new hot topic in the control engineering. The reduction of bandwidth necessitated by the communication network in a networked control system is a major concern. For this reason, a computation method of reducing the number...
In this paper a study of the fuzzy logic controller for ZCS Boost converter is presented. The fuzzy logic controller provides an adaptive control for better system performance and it is used for controlling the non-linear processes. FLC is designed to regulate the output voltage of the converter. The converter is modeled and analyzed using Matlab/Simulink software and it was designed in an closed-loop...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.