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Grid-connected photovoltaic systems with local energy consumption can be equipped with additional energy buffer to increase self consumption when feed-in-tariffs are low or to reduce the negative impact on power network in some periods. The buffer is typically implemented with a lead-acid battery dedicated for day-to-night energy storage. Since the solar energy fluctuates highly during the day, the...
In the paper a new architecture and implementation of the 9-bit hybrid LBDD PWM modulator for digital Class-BD audio amplifier has been proposed. First, the PCM audio signal is transformed into the requantized to 9-bit resolution DPWM data, using LBDD algorithm. Then the 9-bit DPWM data are converted into the two physical trains of PWM pulses to control the output power transistors, using two hybrid...
The paper presents performance analysis of a permanent magnet synchronous motor (PMSM) drive with torque and speed control. The PMSM motor requires sinusoidal stator currents to produce constant torque. The paper presents constituents for the mathematical analysis of the motor operation within the dq-axis model. The mathematical model serves as inspiration for development of a drive design based on...
This paper presents the development of simulation models for proton and carbon irradiated 4H-SiC junction barrier Schottky (JBS) diodes. Compared to protons, heavier carbon ions introduce more defects with deeper levels in the SiC bandgap and more stable damage. For the first time, the free carrier concentration profile extracted from CV simulations for irradiated JBS diode has been compared with...
In this paper project and measured characteristics of the laptop's power supply station with photovoltaic module are presented. This device consists of two switch-mode voltage regulators, photovoltaic module and the lead-acid battery. In the following sections step-down and step-up switch-mode voltage regulators are described and the measured by the author characteristics of voltage regulators and...
Cracks are the most requiring type of pavement distresses to detect and classify automatically. Due to its nature are easily absorbed by other types of pavement surface damages. Moreover, the diversity of pavement surface makes the image detection system requiring efficient computer algorithms. The paper presents the solutions tested on surface distress data which were collected automatically using...
In CMOS electronics using differential pairs, input signals are usually supplied to gate terminals of MOS transistors creating the pair. Then, the tail terminal of the pair is used to ensure the required bias needed for proper operation of the transistors. In this paper, we show that roles of the gate and tail terminals can be changed. This implies, among others, that the tail can be used as a terminal...
The authors present an implementation technique of a novel system which can be used to perform 3-D filtering for separable kernels. The structure, consisting of Givens rotations and delay elements, is implemented in FPGA chip. Givens rotations are based on a pipeline CORDIC algorithm. Presented approach is tested against finite precision noise and sensitivity to structure parameters. It is shown that...
The fractional Fourier transform (FRFT) is a generalization of the well-known Fourier transform. The FRFT depends on an order parameter a and can be interpreted as an a-th power of the ordinary Fourier transform operator. This tool has found widespread applications in areas such as optics, wave propagation analysis, signal and image processing, solving of differential equations, mechanical vibrations...
Problem of effective data processing in scientific applications is well-known. There are two reasons of that: nonoptimal front-end application code and ineffective system of scientific data management at back-end. This article presents differences between flat file and relational database data storage. It also shows (based on Microsoft SQL Server database engine) benefits and methods of taking advantages...
Pseudo-random number generators (PRNGs) are one of the common parts of digital systems used in cryptography, diagnostics, simulation and in many other areas of modern science and technology. Here we present a novel architecture of the PRNG based on the chaotic nonlinear model and pipelined data processing. A significant enhancement in terms of output throughput has been achieved by combining the advantages...
Cubic boron nitride is commonly used as a cutting tools material for the sake of its high hardness and wear-resistance. Pulse Plasma Sintering was proposed to decrease the production costs. This method is very attractive for industry, because it significantly decreases the costs of production. The goal of this paper is to present the control system prototype for Pulse Plasma Sintering processes based...
The first galvanometer motors were developed at the beginning of 20th century. However, due to various design limitations, initially they were mainly used as indicating or recording devices. Later, after new construction concepts were introduced, it become possible to use them for other more advanced purposes. They have become a very important element of various precise positioning systems, where...
The paper introduces a logic controller design system, called PNAD, supporting UML activity diagrams in version 2.x as a semi-formal specification technique. The system enables transformation of activity diagrams into control Petri nets, their formal verification using model checking technique and the nuXmv tool, generation of synthesizable code in hardware description language VHDL and generation...
This paper describes design and construction of a laser projector. Laser projectors are perfect for displaying graphics that need to catch our attention. In this paper we present the novel approach to animation which can later displayed by the self-made laser projector. The laser projector presented in paper is composed of galvanometer mirrors, green laser, microcontroller and a dedicated software...
This paper describes development and testing of the measurement system designed for a purpose of monitoring the heat flow, as well as humidity penetration in structures based on innovative building materials. At the beginning, the novel building materials and techniques, including nanotechnology-based ones are briefly presented, then vision of the structure monitoring system is described. Next, details...
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