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.
This paper investigates the switching ripple compensation in multi-sampling digitally controlled Switched-Mode Power Supplies (SMPS) which is based on repetitive control. In integrated digital controllers for SMPS, the main bandwidth limitations come from A/D conversion time, calculation delays and the sample-and-hold effect for the Digital-Pulse-Width Modulation. When the former two are negligible...
An analytic method to generate the real-time trajectory of the center of mass (CoM) is proposed for given zero moment point (ZMP) pattern. The whole walking process is divided into transient and periodic walking phases. For each phase of walking, we compute the analytic solution of the center of mass for given ZMP based on the inverted pendulum model. Specially, for the transient walking phase, we...
This paper investigates power line communication in digitally-controlled dc-dc converters in distributed architectures that share the same bus voltage. Communication between different dc-dc converters is obtained by means of switching frequency and duty-cycle modulation detecting the switching signal on the common supply bus voltage. The proposed solution is simple and it takes the full advantages...
This paper presents a discrete time cycle by cycle controller for a three level resonant single stage power factor correction converter. The controller is supposed to generate variable frequency pulse width modulated (VFPWM) gate signals to the switches. The merits of such control method is to tightly regulate the output voltage, shape the input ac current as well as regulating the dc bus voltage...
This paper presents a new resonant gate drive circuit that utilizes transformer leakage inductance as resonant component. The new gate driver circuit can drive a pair of MOSFETs, which can be used in both with same reference and different reference circuits such as MOSFETs in buck, bridge converters. Pulse controlled resonance is used to reduce the conduction loss of resonant circuit. Also it provides...
The "pseudo contact point" monitoring method, which we have developed, is a powerful tool to monitor contact state transitions in a task. In this paper we show a method how to determine evaluation functions and parameters for monitoring state transitions in a task. This method enables us develop evaluation functions for detecting contact state transitions in a task when monitoring contact...
A new strategy for stator fault diagnosis in induction motors is presented in this paper. The proposed strategy is based on the generation of a vector of specific residual using a state observer. The residual allows the detection of the faulted motor phase and the quantification of the number of shortcircuited turns. This strategy is robust to motor load variation and power supply perturbations
Humanoid robotics attracted the attention of many researchers in the past 35 years. The motivation of research is the suitability of the biped structure for tasks in the human environment. The control of a biped humanoid is a challenging task due to the hard-to-stabilize dynamics. Walking reference trajectory generation is one of the key problems. The zero moment point (ZMP) criterion is widely employed...
In this paper, we study the control of an ellipsoid immersed in an infinite volume of ideal fluid with irrotational motion. The dynamics are given by Kirchhoff's laws. By adopting a backstepping viewpoint, we prove that the position and the attitude of the solid can be forced to approximately follow any given smooth path, using three controls (two controls for the direction and one control for the...
The development of renewable energy based generation technologies attracts more and more attention. In particularly large number of wind turbines are being installed and connected to power system. In some countries or networks, the penetration level of wind power is significant high so as to affect the power system operation and control. Consequently, the stable operation of wind turbine systems is...
Paper making and processing applications require several drives that need to deliver high performance, in particular considering the high speed operation of the newer machines. Electronic synchronization is now used instead of mechanical transmissions to assure the quality of the produced paper rolls. The resulting increased complexity of the controls is offset by the simplification of the mechanics...
Flux drooping occurs at the sector transition in direct torque controlled drives especially at low speed and high load operating conditions. A comprehensive analysis of this phenomenon and the schemes reported in the literature to address this limitation are presented in the paper. In addition, an efficient control scheme is proposed to minimize the flux drooping at sector boundaries. The proposed...
The paper presents the study of the multi-functions of a power electronic converter in distributed generation systems. The converter is an interface of a DG unit and also may perform other functions with the help of the appropriate control strategies. In steady states, the converter is used as an interface for the DG unit to delivery the power, and acts as an active power compensator in a hybrid compensation...
Novel methodology of synchronized pulsewidth modulation (PWM) has been disseminated for control of six-phase (dual-three phase) induction machine drives fed by two three-phase inverters with both single and separate DC voltage sources. Control algorithms are based in this case on the 30deg-phase-shifting of control and output signals of two standard voltage source inverters. Four basic schemes of...
Motion control has been widely used in industry applications. One of the key technologies of motion control is a disturbance observer, which estimates a disturbance torque of a motion system and realizes a robust acceleration control. The disturbance observer can observe and suppress the disturbance torque within its bandwidth. Recent motion systems begin to spread in the society and they are required...
This paper deals with the design of a three phase synchronous reluctant machine. This machine is constituted by two stators and two massive rotors. A homopolar exciting winding is jointly liable for stator. Due to three-dimensional geometry of the machine, the main object of this study is to develop very quick tools of design which allows defining motor performances. This method is based on reluctance...
This paper proposes a new anti-slip readhesion control system for electric railway vehicle driven by inverter-fed induction motors. This paper designs an instantaneous tangential force coefficient estimator between driving wheel and rail, which is based on disturbance observer. The torque command of proposed system regulates to exceed this estimated tangential force coefficient in order to avoid undesirable...
In this paper an improved predictive control is proposed for the control of the current in a three-phase voltage source converter. The application for this work is an active shunt power filter (ASF). The proposed control system takes into account unavoidable digital controller delays, which make it difficult to predict the ASF behaviour in the next sampling period. A "two ahead" current...
In this paper, we propose a window-based architecture with parallel filtering engine to accelerate the adaptive deblocking filter in H.264/AVC video coding standard. In order to improve overall system performance, we use a configurable 44times32-bit FIFO memory with a novel processing order to simultaneously process the horizontal filtering of vertical edge and vertical filtering of horizontal edge...
This paper presents the implementation of a fingerprint image enhancement algorithm on a FPGA device. The design is based on a hardware-software co-design, which consists of a dedicated coprocessor that solves the parts of the algorithm with higher computational cost and an embedded microprocessor that manages the control process and executes the rest of the algorithm. In order to develop an efficient...
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.