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    Wyświetlanie 1-9 z 9
    Tytuł:
    New Conception of Safety Logic Microcontroller
    Autorzy:
    Sałamaj, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/226338.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    safety logic microcontroller
    critical systems
    master-slave architecture
    handshake
    GALS
    conception
    Opis:
    In this paper a new conception of safety logic microcontroller (BML) is described, together with its physical hardware realization. The unit has various mechanisms which increase its safety and reliability, so that it can satisfy rigorous requirements of safety-critical systems. Thus, the BML unit uses some untypical and innovative technical solutions. The new approach to safety systems development allowed to propose a new conception. The paper describes also physical realization of small multiprocessor BML unit for management of decision-control systems adopted to critical usage.
    Źródło:
    International Journal of Electronics and Telecommunications; 2012, 58, 4; 419-424
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improved and innovated universal DAQ microcontroller unit
    Autorzy:
    Dostálek, P.
    Pekař, L.
    Navrátil, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/963928.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    data acquisition card
    engineering education
    microcontroller unit
    temperature control
    Opis:
    This paper is aimed at the description of hardware design, software equipment and the functionality of the second evolution of the intelligent multipurpose input/output microcontroller converter and control unit designed and assembled by the authors. Preceding stages of the unit development are concisely overviewed first, the deficiencies of which give rise to the primary motivation of this contribution. Then separate hardware parts of the novel unit are described in detail including electronic schematic diagrams. The device firmware and software capabilities are introduced as well. The advantages of the unit are highlighted compared to older versions. Its functionality, performance and efficiency are then verified by a laboratory control-related dynamic responses measurement example. In the contrary to previous evolutions, a more compact hardware design, increased A/D and D/A converter resolutions, added USB communication capability, better and more accurate analog circuits with more advanced operation amplifiers, the use of OLED instead of LCD display, the pulse-width modulated signal generated by the microcontroller unit itself can be considered among the most important improvements. Moreover, the direct use of the serial link may reduce noise significantly and makes the device more universal.
    Źródło:
    International Journal of Electronics and Telecommunications; 2017, 63, 2; 171-180
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hardware techniques for improving the calibration performance of direct resistive sensor-to-microcontroller interface
    Autorzy:
    Kokolanski, Z.
    Gavrovski, C.
    Dimcev, V.
    Makraduli, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/221499.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    passive sensor
    sensor interface
    calibration
    microcontroller
    Opis:
    Direct sensor-to-microcontroller is a simple approach for direct interface of passive modulating sensors to a microcontroller without any active components in between the sensor and the microcontroller and without an analog to digital converter. The metrological performances of such interface circuits are limited by certain microcontroller parameters which are predetermined by the manufacturing technology. These limitations can be improved by specific hardware-related techniques and can improve the accuracy, speed and resolution of the measurements. Such hardware solutions as well as proper selection of the electrical components are addressed in this paper. It has been shown that employment of only a few MOSFET transistors can reduce the maximal relative error of single point calibration more than fifteen times and can increase the measuring speed around 30 % in all calibration techniques in the measurement range of PT1000 resistive temperature sensors. Moreover, the effective number of resolution bits increases by more than 1.3 bits when using an external comparator.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 4; 529-542
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conception of a Control Unit for Critical Systems
    Autorzy:
    Sałamaj, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/226077.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    safety logic microcontroller
    critical systems
    master-slave architecture
    FPGA
    conception
    Opis:
    The article regards critical systems precisely controlled by safety units. A new idea of safety logic microcontroller is proposed. It is built on the basis of the simplest mechanisms and technical solutions. This approach allowed to obtain a complex decision-making and control microsystem, in which the applied mechanisms and solutions increased its reliability. As a result, the proposed control unit proved to be a universal solution, which can be used in any critical system.
    Źródło:
    International Journal of Electronics and Telecommunications; 2013, 59, 4; 363-368
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Implementation of a Compact Smart Resistive Sensor Based on a Microcontroller with an Internal ADC
    Autorzy:
    Czaja, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/221453.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microcontrollers
    resistance measurement
    ADC
    time-domain measurements
    Opis:
    In the paper a new implementation of a compact smart resistive sensor based on a microcontroller with internal ADCs is proposed and analysed. The solution is based only on a (already existing in the system) microcontroller and a simple sensor interface circuit working as a voltage divider consisting of a reference resistor and a resistive sensor connected in parallel with an interference suppression capacitor. The measurement method is based on stimulation of the sensor interface circuit by a single square voltage pulse and on sampling the resulting voltage on the resistive sensor. The proposed solution is illustrated by a complete application of the compact smart resistive sensor used for temperature measurements, based on an 8-bit ATxmega32A4 microcontroller with a 12-bit ADC and a Pt100 resistive sensor. The results of experimental research confirm that the compact smart resistive sensor has 1°C resolution of temperature measurement for the whole range of changes of measured temperatures.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 2; 225-238
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Frequency response analysis of microcontroller-based discrete-time lead-lag compensators
    Autorzy:
    Dewantoro, Gunawan
    Rizky, Irwin Shauma
    Murtianta, Budihardja
    Powiązania:
    https://bibliotekanauki.pl/articles/949895.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Arduino Uno
    discretization
    frequency response
    lag compensator
    lead compensator
    Opis:
    With the rapid advancement of digital processors, filters have been commonly implemented using microcomputers. In this study, a low-cost and compact Arduino Uno development board was used to realize digital lead and lag compensators. Arduino boards are very affordable. Consequently, they were investigated to see if they were capable of preserving the frequency response of continuous-time compensators. The experiments required a set of equipment including a function generator, an Arduino Uno development board, a PC-based oscilloscope, and a laptop. The signal frequency was varied from 0 to 500 Hz. Two discretization methods were employed, namely bilinear transformation and matched pole-zero mapping. The results showed that an Arduino Uno board can be utilized to implement lead and lag compensators to some extent. The discrete-time compensator preserved the capability of filtering out certain frequencies. The change in DC gain was negligible, however, there was a significant difference in the cut-off frequency and transient slope. For both discretization methods, the frequency responses at high frequency experienced a rippling profile.
    Źródło:
    Archives of Electrical Engineering; 2020, 69, 4; 937-950
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Problems in solving fractional differential equations in a microcontroller implementation of an FOPID controller
    Autorzy:
    Matusiak, Mariusz
    Ostalczyk, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/140935.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fractional calculus
    Grünwald-Letnikov fractional-order backward difference
    FOPID
    hardware implementation
    Opis:
    The article focuses on the fractional-order backward difference, sum, linear time-invariant equation analysis, and difficulties of the fractional calculus microcontroller implementation with regard to designing a fractional-order proportional integral derivative (FOPID) controller. In opposite to the classic proportional integral derivative (PID), the FOPID controller is defined by five independent parameters. Hence, it is more customizable and, potentially, more precise on condition that the values of fractional integration and differentiation orders are properly selected. However, a number of operations and the time required to calculate the output signal continuously increase. This can be a significant problem considering the limitations of a microcontroller, including memory size and a constant sampling time of the set-up analog-to-digital (ADC) converters. In the article, three solutions are considered, and results obtained in the experiments are presented.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 3; 565-577
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A novel source side power quality improved soft starting of three-phase induction motor using a symmetrical angle controller through pic microcontroller
    Autorzy:
    Selvaperumal, S.
    Krishnamoorthy, N.
    Prabhakar, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2086849.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    soft starting of three phase induction motor
    symmetrical angle controller
    AC voltage controller
    power quality improvement
    rozruch trójfazowego silnika indukcyjnego
    symetryczny kontroler kąta
    kontroler napięcia prądu przemiennego
    poprawa jakości energii elektrycznej
    Opis:
    PIC microcontroller has a vital role in various types of controllers and nowadays the presence of PIC microcontroller is unavoidable in most control applications. This paper describes the enhancement of soft starting of induction motors using PIC microcontroller. Soft starting is required for the induction motors with reduced applied voltages so that the peak starting current is reduced and the startup of the motor is smooth with controlled torque and reduced mechanical vibrations, reduced starting current with correspondingly reduced bus voltage drops. While many of the available schemes of soft starting offer better results in view of smooth starting process, the proposed methodology offers soft starting as well as it cares about the source current quality. In contrast to the conventional multistep starting scheme, in this work a continuously controlled starting scheme is proposed. The three phase AC voltage controller topology is used as the core controller. In each of the half cycles, instead of a single conduction period with a single delay angle, the proposed AC voltage controller is switched symmetrically in each half cycle with multiple pulses in each quarter cycle. Symmetrically placed fixed numbers of switching pulses are used. The paper also describes the various time ratio controls namely the phase angle controller, the extinction angle controller and the symmetrical angle controller. The design aspects of the proposed soft starting scheme and the validation of the proposed system in the MATLAB SIMULINK environment are presented in this paper.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; e136746, 1--12
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A novel source side power quality improved soft starting of three-phase induction motor using a symmetrical angle controller through pic microcontroller
    Autorzy:
    Selvaperumal, S.
    Krishnamoorthy, N.
    Prabhakar, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2128138.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    soft starting of three phase induction motor
    symmetrical angle controller
    AC voltage controller
    power quality improvement
    rozruch trójfazowego silnika indukcyjnego
    kontroler kąta symetryczny
    kontroler napięcia prądu przemiennego
    poprawa jakości energii elektrycznej
    Opis:
    PIC microcontroller has a vital role in various types of controllers and nowadays the presence of PIC microcontroller is unavoidable in most control applications. This paper describes the enhancement of soft starting of induction motors using PIC microcontroller. Soft starting is required for the induction motors with reduced applied voltages so that the peak starting current is reduced and the startup of the motor is smooth with controlled torque and reduced mechanical vibrations, reduced starting current with correspondingly reduced bus voltage drops. While many of the available schemes of soft starting offer better results in view of smooth starting process, the proposed methodology offers soft starting as well as it cares about the source current quality. In contrast to the conventional multistep starting scheme, in this work a continuously controlled starting scheme is proposed. The three phase AC voltage controller topology is used as the core controller. In each of the half cycles, instead of a single conduction period with a single delay angle, the proposed AC voltage controller is switched symmetrically in each half cycle with multiple pulses in each quarter cycle. Symmetrically placed fixed numbers of switching pulses are used. The paper also describes the various time ratio controls namely the phase angle controller, the extinction angle controller and the symmetrical angle controller. The design aspects of the proposed soft starting scheme and the validation of the proposed system in the MATLAB SIMULINK environment are presented in this paper.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; e136746, 1--12
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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