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This paper describes the development and hardware-in-the-loop testing of an Extended Kalman Filter (EKF) for attitude estimation. After literature review, a multi-mode solution to the estimation problem is introduced. It uses the sensor measurements optimally relying on the magnetic and acceleration data on the ground, and magnetic and GPS data in the air. An emergency aerial mode dealing with lost...
A new rotor position sensorless method for switched reluctance motor drive system (SRD) is described in this paper. Rotor position can be considered as a function of phase current and the variation rate of it. Using the phase current obtained by sensors and the current variation the rotor position can be estimated accurately and quickly. A control strategy of SRD without position sensor is researched...
This paper features the design and detailed analysis of a fully concurrent dual-band Low Noise Amplifier (LNA) operating in the GSM 0.9 GHz & BLUETOOTH 2.4 GHz communication standards having an inter-stage matching inductor. An interstage inductor between the common source stage and the common gate stage is used to increase power gain. In this work, all the circuit components are considered on-chip...
Low dropout voltage regulators (LDO) use a large external capacitor, in the range of few micro-farads. These external capacitors occupy valuable board space, increase the IC pin count and prohibit System-On-Chip (SoC) solutions. The large external capacitor is replaced with a reasonable InF internal capacitor. The capacitor-less LDO is designed for an output voltage of 1.4V for a given supply voltage...
Transmission of compressed video over unreliable networks is vulnerable to errors and error propagation. Multi-hypothesis motion compensated prediction (MHMCP) which was originally developed to improve compression efficiency has been shown to have a good error resilience property. In this paper we improve the overall performance of MHMCP in packet loss scenarios by performing optimal mode switching...
Limited preemption scheduling has been introduced as a viable alternative to non-preemptive and fully preemptive scheduling when reduced blocking times need to coexist with an acceptable context switch overhead. To achieve this goal, preemptions are allowed only at selected points of the code of each task, decreasing the preemption overhead and simplifying the estimation of worst-case execution parameters...
In this paper, design and implementation of stabilizing controller for Rotary Inverted Pendulum (RIP) which is an underactuated nonlinear mechanical system, is presented. A sliding mode-state feedback control scheme is proposed for the stabilization of the RIP system. In this scheme, genetic algorithm based state feedback control and sliding mode control (SMC) combined. After swinging up the pendulum,...
This paper describes a digital proportional-integral-derivative (PID) controller technique applied to the DC-DC buck converter. The converter is modelled using a state space averaging technique. Due to the non-linear of the power converter, the PID controller is designed to simplify the compensation of the DC-DC converter. The control algorithm is implemented in digital signal processor (DSP) TMS320F2812...
In this paper, the placement of sectionalizers, as well as, a cross-connection is optimally determined so that the objective function is minimized. The objective function employed in this paper consists of two main parts, the switch cost and the reliability cost. The switch cost is composed of the cost of sectionalizers and cross-connection and the reliability cost is assumed to be proportional to...
Due to the rapid increase of population and the necessity of providing adequate drinkable water supplies, which meet hygiene conditions, modern techniques are applied for water treatment. In particular, this study introduces a flexible model for describing, calculating and estimating the volume of water in distribution tanks through all phases of treatment processes. The model considers a typical...
A Ku band 90deg bit phase shifter with improved switched-line structure was fabricated. In this article, the bandwidth of the proposed phase shifter is much wider than the conventional ones. The proposed phase shifter operates from 14 to 16 GHz with plusmn2deg of phase deviation.
A significant problem with neutral-point-clamped three-level inverters is the fluctuation in the neutral-point voltage. When three-level inverter is loaded, the neutral-point voltage leads to the distortion on output voltage space-vector waveform of the inverter. A novel and simple judge rule based on the virtual space-vector is introduced. The mathematics models of neutral-point circuit and neutral-point...
Using the state-space average modeling method, a nonlinear affine model of Boost converter working on current conduction mode (CCM) is set up. Based on the input-output linearization method of differential geometry theory, the internal dynamics of the systems, with output represented by the input inductor current and the capacitor voltage respectively, are been studied. It is pointed out that the...
Through analyzing the shortcomings of the control system on the traditional cutting inverter, this paper presents the double close loop control system based on pole assignment for cutting inverter, which based on phase shift full bridge zero voltage switched (PS-FB-ZVS). This paper builds the small signal mode of PS-FB-ZVS PWM converter, and assigns the double close loop PI parameters by pole assignment...
This paper models the three-phase boost-type rectifier as switched linear systems (SLS) in the d-q reference frame which includes six available subsystems, so the problems of PFC and DC-bus voltage regulation are transformed to stabilizing the SLS. And then a novel control rule based on min-projection strategy is proposed, which controls the switching sequence around the six subsystems such that the...
Loaded switches are frequent for the running electric locomotive. The frequencies, phases and amplitudes between the system voltage and residual voltage may be different when the transformer is put into use. The transient responses at different time points are thus analyzed to determine the optimal time to switch on the locomotive transformer and prevent the damage to the system.
Single phase neutral point clamped (NPC) converters are increasingly applied in high speed railway traction drive systems as they allow the use of lower voltage devices in higher voltage applications, provide reduced output voltage THD and can develop low common mode voltage. To solve the imbalance problem of neutral point voltage, dead-time effect for neutral point voltage is described in this paper...
On the basis of analyzing three-level inverter direct torque control principle (DTC) , a new synthesizing vectors PWM method of three-level DTC is presented, which can not only effectively control neutral- point voltage, but also restrain higher dv / dt of output voltage and improve three-level DTC output performance ,reduce torque ripple. Through theory analysis and experiment research, the author...
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