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In this paper, for a missile with blended lateral jets and aerodynamic fins, output tracking is realized by a switching control in a hybrid control architecture. The switching control strategy is divided into four phases in terms of practical guidance and control course. The switching conditions, from one phase to another, are given. Lateral jets and aerodynamic fins are adopted separately in respective...
The purpose of this paper is to improve the performance of MEMS parallel plate actuators and RF switches systems. Electrostatic micro actuators are normally driven by static open-loop voltage control schemes. A major problem in this control strategy is that at a distance of two-thirds of the zero-bias capacitive gap, the actuator position becomes unstable and collapses. This phenomenon is known as...
This paper deals with optimization techniques for linear impulsive hybrid systems (LIHSs). We study the LQ (linear quadratic) impulsive hybrid optimal control problem (OCP) and apply the corresponding Pontryagin-type maximum principle (MP) (see). Our aim is to investigate the natural relationship between the above MP and the Bellman dynamic programming (DP) approach to the above hybrid OCP under consideration...
This paper presents a stabilizing approach used to control the voltages on the capacitors and the currents in the load of a four-level three-cell DC-DC converter. A general method based on bond graph formalism and the notion of commutation cells is presented to derive the mathematical model for the system, needed in order to compute the feedback. The control law is deduced using a Lyapunov function...
This paper presents the analysis, design and simulation from a simple DC-UPS converter with integrated back-up and automatic transition. This converter makes automatic transition between the main AC and the battery when a failure occurs, and it delivers uninterrupted DC power to the load through two independent power sources of commercial input power and battery power. The converter has the following...
In this paper the nonlinear average current control for a DC to DC buck converter is presented in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). The outer voltage controller uses a PI controller. In this control scheme, switch current is being sensed instead of inductor current. Average of inductor current, output voltage with line and load regulation is being controlled...
This paper presents a novel controller for parallel-connected critical PFC converters, and a method is presented to achieve variable frequency PWM signals interleaving equally with only one single DSP, and the parallel-connected interleaving critical PFC modules are implemented with a single controller based on one-cycle controller, it need not detect or judge switch peak current and zero-cross of...
A hybrid system model is given for the power grid side converter based on hybrid system theory. This converter is part of the excitation source of the double-fed induction wind power generator. With space vector pulse width modulation method, we take the modulation of a space voltage vector in the third sector as a typical example; analyze the modulation process of the approximation of the three shared...
This paper makes a study of application of variable structure control for stabilizing double inverted pendulum system and designs state-feedback controller based on poles placement theory. The researching results of this paper are applied to linear inverted pendulum experiment equipment produced by Googol Technology LTD. so as to verify the effectiveness of the control law. The result of experiments...
In this paper, the mathematical model of three-phase four-wire three-level neutral-point-clamped (NPC) voltage source rectifier (VSR) using switching functions is founded and its operating principle analyzed. Then a new nonlinear control law based on Lyapunovpsilas stability theory for the PWM rectifier is presented. With this control law, the converter can be stabilized globally for handling large-signal...
DC-DC switch-mode converters recently have been increasingly used in many EV and HEV applications when the power distribution is in the form of multi-converter DC electrical system due to their good specifications. Different control strategies such as sliding mode control and current mode control have been applied to DC-DC converters to improve their robustness, efficiency, and stability. However,...
A linear switched reluctance motor (LSRM) based position tracking system and its control aspect are presented in this paper. Based on modeling analysis of the drive system, two reduced order controlled models are developed with different time scales, referred as mechanical subsystem and electrical subsystem. Two controllers are respectively designed for the two subsystems. Simulation results demonstrate...
An optimal control method allowing to achieve the high dynamic performances of switched-mode power converters described by the second-order difference equation is offered. To this purpose, control vector is formed as a linear combination of differences of system variables, and matrix transformation of the linear equation to the nilpotent form is implemented. This control approach gives an ability...
A control system for permanent magnet synchronous motor electric drives with a significant torsion vibration mode is presented based entirely on sliding mode principles to achieve robustness against external load torques and parametric modelling uncertainties in the motor and/or the driven mechanical load. The sliding mode control law respects the vector control condition by keeping the direct axis...
The present work focuses on singularities, in terms of time functions, which are met in description of switching or sampling electronics systems, and on understanding of some basic nonlinear physical systems. The state-form dx/dt = [A(x,t)]x + [B(x,t)]u(t), and not the normal-form dx/dt = Phi(x,u,t), is preferred for use. The possibility of the state-variables appearing in the matrices in a singular...
Passivity-based control (PBC) is based on a procedure including energy/power shaping and series/parallel damping injection to control several nonlinear systems such as power converters. In this paper, PBC is used to design a controller for three phase/level/switch PWM (Vienna I) rectifier. Passivity-based controller is supposed to regulate the output voltage and the input three phase sinusoidal currents...
Dynamic-element-matching (DEM) techniques are used to reduce distortions in multi-bit digital-to-analog-converters (DACs), which occur due to the static level mismatch of the switching elements. The common design strategy of established DEM algorithms is to shape the produced mismatch error signal by targeting a uniform usage of the DAC switching elements. In this paper a novel DEM technique is presented,...
The paper addresses the problems of motion control in autonomous underwater vehicle. It is established a simplified mathematical model of AUV's pitch motion in vertical plane by linearizing the nonlinear model at a specified operating point. A fuzzy sliding-mode controller was designed to control the AUV's pitch motion under the disturbance of ocean current. The computer simulation results showed...
Networks on chips (NoCs) provide a mechanism for handling complex communications in the next generation of integrated circuits. At the same time, lower yield in nano-technology, makes self repair communication channels a necessity in design of digital systems. This paper proposes a reliable NoC architecture based on specific application mapped onto an NoC. This architecture is capable of recovering...
The design of variable structure control (VSC)of uncertain discrete time systems using discrete exponential reaching law is discussed. The reason for the discrete reaching law to cause system chattering is given and an improved discrete reaching law is developed. A grey estimating model is built for the uncertain part and thus values of parameters are obtained. Simulation results are presented to...
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