Journal articles: 'Impulse converter'

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Gusev, Nikolay, Larisa Svatovskaya, and Alexandr Kucherenko. "Effect of changing of the parameters of the cable network of monitoring systems of high-rise buildings on the basis of string converters on their operability." E3S Web of Conferences 33 (2018): 02069. http://dx.doi.org/10.1051/e3sconf/20183302069.

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The article is devoted to the problem of improving the reliability of monitoring systems for the technical conditions of high-rise buildings. The improvement is based on string sensors with an impulsed excitation method ensuring the maximum signal-to-noise ratio at their output. The influence of the parameters of the monitoring system on the shape of the excitation impulses of the string, and, consequently, on the amplitude of the string vibration of the string converter is also considered in the article. It has been experimentally proved that the parameters of the excitation impulses of the string converters. The article presents the results of the experiments showing the effect of the fronts duration of the excitation impulses on the amplitude of the oscillations of the strings. The influence of the fronts duration of the excitation impulse with the frontal lengths up to 0.5 ms is studied at the excitation impulse duration not exceeding 0.5 times the duration of natural oscillation periods of the string. The experimental data are compared with the theoretical ones and hypotheses explaining their difference are advanced. The article suggests some methods of reducing the influence of the cable-switching equipment system parameters on the amplitude of string oscillations. The possibilities of improving the reliability of the systems developed on the basis of string sensors with an impulsed excitation method and used for monitoring the technical conditions of the high-rise buildings are proposed.

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Sergiienko, Anna S., and Sergej S. Starostin. "IMPULSE MODEL OF A FREQUENCY MATRIX CONVERTER." ELECTRICAL AND COMPUTER SYSTEMS 19, no. 95 (July 2, 2015): 88–91. http://dx.doi.org/10.15276/eltecs.19.95.2015.22.

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Volkov, I. V., and S. V. Podolny. "ENERGY CHARACTERISTICS OF THE RESONANT TYPE CONVERTER WITH METERED ENERGY TRANSMISSION." Tekhnichna Elektrodynamika 2021, no. 2 (February 23, 2021): 42–46. http://dx.doi.org/10.15407/techned2021.02.042.

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This article investigated two cases of impulse transformer location selection in the DC-DC type two-step resonant converter, which fully segregates processes of taking and transferring energy between the input and its load. The electromagnetic processes during energy taking/transferring were studied, including active and static losses in the converter elements. Based on the suggested analytical-numerical method, the criteria for selecting the impulse transformer optimal transformation ratio, from the system efficiency point of view, was derived. The proposed optimization technique can be applied to a wide variety of input and output parameters. References 3, Figures 7.

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Jadeja, R. B., S. A. Kanitkar, and Anurag Shyam. "FFT Analysis of a Series Loaded Resonant Converter-Based Power Supply for Pulsed Power Applications." International Journal of Plasma Science and Engineering 2008 (April 24, 2008): 1–5. http://dx.doi.org/10.1155/2008/284549.

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An impulse power supply has been designed, simulated, and tested in order to feed the primary of a high-frequency transformer. Pulse power system has been widely used for plasma applications. The operational principle of the pulse power system is that the energy from the input source is stored in the capacitor bank device through a dc-dc converter. Then, when a discharging signal is given, the stored energy is released to the load. The new family of ZCS converters is suitable for high-power applications using insulated gate bipolar transistors (IGBTs). The power converter can achieve zero switching with the aid of high-frequency transformer. The device is capable of charging a 0.1 μF capacitor up to 5 kV which accounts for a charging power of 5 kJ/s. The novel control algorithm is achieved which eminently considers the nonlinear control characteristics of impulse power supply. The required charging voltage, together with the constraint on the charging time, translates into a required maximum power of 10 kW reduced in this initial version to 5 kW. The difficulty to reliably control such a power at the high-voltage side practically forbids any approach featuring a more or less stabilized DC high-voltage to be generated from a conventional 50 Hz transformer through rectification.

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Wrzuszczak, Maria, Volodymyr Khoma, and Roman Baran. "Impulse-Code Converter with Selected Resolution and Square-Root Transform Function." Pomiary Automatyka Robotyka 19, no. 4 (December 14, 2015): 21–25. http://dx.doi.org/10.14313/par_218/21.

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Tang, Bei Bei, Yun Zhang, Zhi Jing Xu, and Jun Li. "Research on Performance of Analog to Information Converter." Applied Mechanics and Materials 333-335 (July 2013): 601–4. http://dx.doi.org/10.4028/www.scientific.net/amm.333-335.601.

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Compressive Sensing (CS) Theory enables sampling discrete signals with quite lower sampling rate compared with traditional Nyquist sampling rate and guaranteeing faithful reconstruction. Based on CS theory, Analog-to-Information Conversion (AIC) was proposed to process continuous-time signal. In this paper, the framework of Analog-to-Information Converter is composed by a pseudo-random demodulator, a low pass analog filter and a low speed sampler. And we mainly discuss the damage on the signal recovery produced by lower and higher orders of filter impulse response.

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CHUDAKOV, Alexander I., Valery O. IVASHCHENKO, Alexey P. ZELENCHENKO, and Nikolay V. LYSOV. "Optimization of control systems for suburban trains." Proceedings of Petersburg Transport University 2021, no. 4 (December 2021): 499–506. http://dx.doi.org/10.20295/1815-588x-2021-4-499-506.

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Objective: The use of pulse conversion of electricity on direct-current traction rolling stock is discussed. Methods: A variant of the system for regulating the operating modes of traction motors of suburban electric trains using a pulse converter based on insulated gate bipolar transistors is described. (IGBT). Results: The proposed impulse control system is presented as a possible option for the modernization of the applied control systems, which makes it possible to improve the traction and energy indicators of suburban electric trains. The advantages of pulse converters based on IGBTs are shown in comparison with converters based on one- and two-operation thyristors. A simplifi ed electrical diagram of the power circuit of a motor car with a pulse converter is presented, a description of the operation of the power circuit in the traction mode and in the modes of rheostatic and regenerative braking is given. Practical importance: The presented results of the technical and economic comparison of the control systems of the ED4M electric train with a Современные технологии – транспорту 505 ISSN 1815-588Х. Известия ПГУПС 2021/4 contactor-rheostat control system and an electric train with regulation of the operating modes of traction electric motors by a pulse converter based on IGBT prove the best energy effi ciency of an electric train equipped with a pulse control system

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Antipina, E. S., S. N. Zhilin, and G. V. Kukinova. "Technological Capabilities of Impulse Rotators." IOP Conference Series: Earth and Environmental Science 988, no. 5 (February 1, 2022): 052002. http://dx.doi.org/10.1088/1755-1315/988/5/052002.

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Abstract In the article “Technological capabilities of impulse rotators” the results of use of impulse rotators in some technological processes, differential adjustment of their motion with kinematic and dynamic vibration exciter are considered. Equation of kinetic energy of impulse rotator allows to determine mutual influence of design elements on rational use of supplied pulse energy for useful work. Positive qualities of kinematic torsional vibration exciters are noted, the main of which is organization of force pulse regularity and its considerable force possibilities of pulse creation. A generalized graph of the change of productivity and wear of the working element of the pulse converter compared to the static one is given. Features of impulse rotators with kinematic excitation of torsional oscillations make it possible to change the mode of work performance, to apply low-energy processes of individual operations. Transportation way of destruction products by the screw with use of an impulse rotator on breeds above average fortress excludes use of the compressor. Machines with rolling and spring impact tools do not correspond to the screw method of destruction products discharge and require compressor use. In this case, the energy intensity of production unit increases more than twice.

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Clautice, Edward G. "A presentation of acoustical impulse responses with an analog‐to‐digital converter." Journal of the Acoustical Society of America 81, S1 (May 1987): S31. http://dx.doi.org/10.1121/1.2024189.

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10

Renzi, E., Y. Wei, and F. Dias. "The pressure impulse of wave slamming on an oscillating wave energy converter." Journal of Fluids and Structures 82 (October 2018): 258–71. http://dx.doi.org/10.1016/j.jfluidstructs.2018.07.007.

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11

Ciappi, Lorenzo, Lapo Cheli, Irene Simonetti, Alessandro Bianchini, Giampaolo Manfrida, and Lorenzo Cappietti. "Wave-to-Wire Model of an Oscillating-Water-Column Wave Energy Converter and Its Application to Mediterranean Energy Hot-Spots." Energies 13, no. 21 (October 26, 2020): 5582. http://dx.doi.org/10.3390/en13215582.

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Oscillating water column (OWC) systems are among the most credited solutions for an effective conversion of the notable energy potential conveyed by sea waves. Despite a renewed interest, however, they are often still at a demonstration phase and additional research is required to reach industrial maturity. Within this framework, this study provides a wave-to-wire model for OWC systems based on an impulse air turbine. The model performs a comprehensive simulation of the system to estimate the attendant electric energy production for a specific sea state, based on analytical models of the primary (fixed chamber) and secondary (air turbine) converters coupled with the tertiary converter (electric generator). A rigid piston model is proposed to solve the hydrodynamics, thermodynamics, and hydrodynamics of the chamber, in a coupled fashion with the impulse turbine aerodynamics. This is solved with a novel method by considering the cascades as sets of blades, each one consisting of a finite number of airfoils stacked in the radial direction. The model was applied for two Mediterranean sites located in Tuscany and Sardinia (Italy), which were selected to define the optimal geometry of the turbine for a specified chamber. For each system, the developed analytical wave-to-wire model was applied to calculate the performance parameters and the annual energy production in environmental conditions typical of the Mediterranean Sea. The selected impulse turbines are able to convert 13.69 and 39.36 MWh/year, with an efficiency of 4.95% and 4.76%, respectively, thus proving the interesting prospects of the technology.

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Baida, Evgen, and Olena Korol. "Comparative analysis of electromechanical processes in induction-dynamic converter with mobile inductor and two disks." Bulletin of NTU "KhPI". Series: Problems of Electrical Machines and Apparatus Perfection. The Theory and Practice, no. 1 (5) (May 28, 2021): 3–7. http://dx.doi.org/10.20998/2079-3944.2021.1.01.

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General description of the research topic. The article presents a comprehensive study of traditional induction-dynamic mechanisms (with one disk and a fixed coil) and multi-core induction-dynamic mechanisms (linear pulse induction converters) with a movable coil and two disks. Actuality of the topic. Such induction-dynamic mechanisms are widely used in various fields, in particular, in electrical apparatus industry, where speed is one of the most important characteristics. The purpose of the article is a comparative analysis and refinement of the characteristics of the traditional induction-dynamic system with one disk and a fixed coil and multi-core one with a movable coil and two disks. Research method, scientific novelty. The calculations are based on the solution of the equations of the electromagnetic field and the equations for the electric circuit of the coil. Practical significance and main conclusions. During the calculations, the values of electromagnetic force and force impulse acting on the moving disk, energy losses in the system and electromagnetic energy of the system are determined. The results of the study are presented in the form of graphs, namely, the coil current and total magnetic energy for a traditional induction-dynamic mechanism with one disk and for multi-core one with two disks, Joule losses in a fixed coil and disk (in a traditional system) and in a moving coil and two disks (in a multi-core system), force impulse and electromagnetic force of a moving coil (in a multi-core system) and a moving disk (in a traditional and a multi-core system) total impulse of the moving parts of the induction-dynamic mechanism with a multi-core system, as well as the electromagnetic force and the total force acting on the moving parts of the induction-dynamic mechanism with a multi-core system. It is shown that the induction-dynamic mechanism with two disks is less effective in terms of electromagnetic force, impulse and electromagnetic energy than the induction-dynamic mechanism of the traditional layout.

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Saad, Mina, Manuel García-Diaz, and Bruno Pereiras. "Analysis of an optimized radial impulse turbine for an OWC wave energy converter." Journal of Physics: Conference Series 2217, no. 1 (April 1, 2022): 012075. http://dx.doi.org/10.1088/1742-6596/2217/1/012075.

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Abstract OWC concept is one of the most spread technologies among wave energy converters due to several reasons. However, this technology has always deal with the problem of the inherent bidirectional flow. Many solutions have been adopted such as a flow rectification system combined with a unidirectional turbine, several types of bidirectional turbines such as Wells turbine or impulse turbine. In this work, it is shown the performance of an optimized geometry for a radial impulse turbine, which improvement is based on the re-designing of the blades and settling angles of the vanes. A CFD model, validated against results from the bibliography, has been used to simulate both a new and a previous geometry taken as reference. The results of both turbines have been analysed in terms of the loss coefficients for each element in order to analyse the advantages of the new geometry. It has been found that the new geometry exceeds the efficiency of the previous geometry by 5%, being this gain based on the fact that sacrificing the rotor’s efficiency could lead to a great improvement in the performance of the guide vanes, reducing their loss and, in turn, lifting the turbine’s efficiency despite reducing the rotor’s one.

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14

Menaker, K. V., and A. S. Tsvetaeva. "Development of the impulse circuit of excitation of an impact resonant power converter." Russian Electrical Engineering 86, no. 5 (May 2015): 270–74. http://dx.doi.org/10.3103/s1068371215050053.

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15

Alekseev, N. A., P. Yu Bulykin, E. Yu Zmaznov, V. N. Karpov, N. G. Lozinova, A. M. Matinyan, M. V. Peshkov, E. P. Safonov, and O. V. Suslova. "Upgrading of the Vyborg Converter Substation: Analysis of Lightning Impulse Voltage Withstand Capability." Power Technology and Engineering 53, no. 1 (May 2019): 106–12. http://dx.doi.org/10.1007/s10749-019-01044-6.

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Tao, Haijun, Guopeng Zhang, and Zheng Zheng. "Onboard Charging DC/DC Converter of Electric Vehicle Based on Synchronous Rectification and Characteristic Analysis." Journal of Advanced Transportation 2019 (June 2, 2019): 1–10. http://dx.doi.org/10.1155/2019/2613893.

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The DC/DC converter is the core part of the two-stage electric vehicle Onboard Charger. At present, the phase-shifted full-bridge soft-switching DC/DC converter has problems such as difficulty in commutation of the lagging leg, voltage fluctuation on the secondary side of the transformer, and low efficiency. A full-bridge DC/DC converter with two clamp diodes and synchronous rectification is proposed in this paper. Clamping diodes are used to suppress the voltage oscillation of the secondary side of the transformer and provide the commutating energy of the lagging leg. Synchronous rectification reduces the loss of the switching device. The operating principle and control method of the DC/DC converter are analyzed, and the switching device loss is calculated. The simulation and experimental results show that, compared with the traditional DC/DC converter, the voltage impulse of the secondary side of the transformer is smaller, the efficiency is higher, and the soft switch can be realized in a wide load range, which satisfies the requirement of fast charging of vehicle-mounted batteries.

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Abu Bakar, Mohd Aftar, Noratiqah Mohd Ariff, Andrew V. Metcalfe, and David A. Green. "Wavelet Characterizations for Investigating Nonlinear Oscillators." Sains Malaysiana 50, no. 11 (November 30, 2021): 3405–20. http://dx.doi.org/10.17576/jsm-2021-5011-24.

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This study investigates the wavelet-based system identification capabilities on determining the system nonlinearity based on the system impulse response function. Wavelet estimates of the instantaneous envelopes and instantaneous frequency are used to plot the system backbone curve. This wavelet estimate is then used to estimate the values of the parameter for the system. Two weakly nonlinear oscillators, which are the Duffing and the Van der Pol oscillators, have been analyzed using this wavelet approach. A case study based on a model of an oscillating flap wave energy converter (OFWEC) was also discussed in this study. Based on the results, it was shown that this technique is recommended for nonlinear system identification provided the impulse response of the system can be captured. This technique is also suitable when the system's form is unknown and for estimating the instantaneous frequency even when the impulse responses were polluted with noise.

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Amran, M. A. N., A. A. Bakar,, M. H. A. Jalil, M. U. Wahyu, and A. F. H. A. Gani. "Simulation and modeling of two-level DC/DC boost converter using ARX, ARMAX, and OE model structures." Indonesian Journal of Electrical Engineering and Computer Science 18, no. 3 (June 1, 2020): 1172. http://dx.doi.org/10.11591/ijeecs.v18.i3.pp1172-1179.

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<span>This paper presents simulation and modeling of two-level DC/DC boost converter using system identification technique. The main objective is to identify the unknown mathematical model from designated converter that has 2 modes of operation. Signals from the converter were processed based on the impulse response from input and output voltages, which were in time domain data. Auto Regressive with eXogenous (ARX), Auto Regressive Moving Average with eXogenous (ARMAX), and Output-Error (OE) model structure techniques had been employed to generate a model from the converter, whose validation was based on coefficient of determination (R<sup>2</sup>) or best fits criterion. The result shows that the ARX model structure produced the best model with 94.03%, compared to ARMAX and OE with 93.70% and 92.25% respectively. In terms of stability for open-loop analysis, the ARX model structure gave the most stable system.</span>

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PRASAD, K. S., C. ESWARAN, and A. ANTONIOU. "NEW FIRST-ORDER COMPLEX DIGITAL-FILTER SECTIONS AND THEIR APPLICATION FOR THE REALIZATION OF IIR FILTERS." Journal of Circuits, Systems and Computers 03, no. 03 (September 1993): 757–71. http://dx.doi.org/10.1142/s0218126693000459.

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New first-order complex digital-filter sections are realized using the concept of the generalized-immittance converter. These sections are then employed for the realization of infinite impulse response digital filters with real coefficients. The filters obtained with the proposed sections have sensitivity and roundoff noise properties that are comparable to those of other structures of this class reported earlier.

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Bolyukh, V. F., and I. S. Shchukin. "INFLUENCE OF AN EXCITATION SOURCE ON THE POWER INDICATORS OF A LINEAR PULSE ELECTROMECHANICAL CONVERTER OF INDUCTION TYPE." Tekhnichna Elektrodynamika 2021, no. 3 (April 19, 2021): 28–36. http://dx.doi.org/10.15407/techned2021.03.028.

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The purpose of the article is to evaluate the efficiency of an induction-type linear pulse electromechanical converter (LPEC) when operating in shock-power mode and excitation from an alternating voltage source (AVS) in comparison with excitation from a capacitive energy storage (CES). A mathematical model of an induction-type LPEC has been developed both when excited by a unipolar pulse from a CES and from an AVS using lumped parameters of the windings, which takes into account the interrelated electromagnetic, mechanical and thermal processes. It has been found that when the LPEC is excited from the AVS with a voltage frequency of 50 Hz, the electrodynamic force takes on a periodic decaying character with a significant prevalence of positive components of forces over negative ones. The maximum value of the force is much less, and the value of its impulse is much greater than in the LPEC, excited from the CES. With an increase in the frequency of the AVS voltage from 50 to 150 Hz, the highest value of the current density of the inductor winding decreases, and in the armature winding it increases. The greatest values of force and impulse of force are realized at a voltage frequency of 150 Hz. With an increase in the AVS frequency, the relative indicator of the efficiency of the LPEC increases. References 15, figures 4.

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Flamang, P., and R. Sierens. "Study of the Steady-State Flow Pattern in a Multipulse Converter by LDA." Journal of Engineering for Gas Turbines and Power 110, no. 3 (July 1, 1988): 515–22. http://dx.doi.org/10.1115/1.3240165.

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This paper describes pressure and velocity measurements on a multipulse converter under steady-state conditions. Pressure loss coefficients were measured on this four-entry pulse converter system for a large number of flow configurations. Three-dimensional velocity measurements were done (with Laser-Doppler anemometry) for several flow configurations and at different cross sections in the converter. The normal flow situation (incoming flow at the four entries) and back flow situations were examined. For each cross section the axial velocity profiles, the secondary flow patterns, and the turbulent velocities are presented. From the pressure measurements mixing losses are derived. These are compared with the results of a one-dimensional calculation, which is based on the impulse law for incompressible flow. Taking into account the velocity measurements, this simplified model gives a remarkable agreement with the measured mixing losses.

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Merz, Roman, Cyril Botteron, Frédéric Chastellain, and Pierre-André Farine. "A Programmable Receiver for Communication Systems and Its Application to Impulse Radio." Research Letters in Communications 2009 (2009): 1–5. http://dx.doi.org/10.1155/2009/238521.

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The design of a programmable receiver for an ultra wideband (UWB) communication is presented. The receiver is using a fast analog to digital converter (ADC) and a field programmable gate array (FPGA) allowing a rapid performance evaluation for various system architectures and signal processing algorithms. To demonstrate the performance and the versatility of the receiver, a simple communication system and a localization system are implemented. The accuracy of the latter is presented for an indoor environment.

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Park, Sunho, Wooyoung Jeon, Kilwon Kim, and Beom-Soo Hyun. "Practical Method for Performance Prediction of Impulse Turbine for OWC-type Wave Energy Converter." Journal of the Korean Society for Marine Environment & Energy 23, no. 1 (February 25, 2020): 23–28. http://dx.doi.org/10.7846/jkosmee.2020.23.1.23.

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Hosseini, Seyed Mohammad Hassan, Hamid Reza Ghafourinam, and Mohammad Hossein Oshtaghi. "Modeling and Construction of Marx Impulse Generator Based on Boost Converter Pulse-Forming Network." IEEE Transactions on Plasma Science 46, no. 10 (October 2018): 3257–64. http://dx.doi.org/10.1109/tps.2018.2864333.

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Hosseini, S. M. Hassan, and Farzad Faradjizadeh. "Increasing the voltage of PFN impulse generator capacitors by converting it to boost converter." IEEE Transactions on Dielectrics and Electrical Insulation 20, no. 2 (April 2013): 462–67. http://dx.doi.org/10.1109/tdei.2013.6508748.

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Blech, M. D., A. T. Ott, P. Neumeier, M. Möller, and T. F. Eibert. "A reconfigurable software defined ultra-wideband impulse radio transceiver." Advances in Radio Science 8 (September 30, 2010): 67–73. http://dx.doi.org/10.5194/ars-8-67-2010.

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Abstract. An ultra-wideband (UWB) software defined radio (SDR) implementation is presented. The developed impulse radio (IR) transceiver employs first order bandpass (BP) sampling at a conversion frequency which is four times the channel bandwidth. The subsampling architecture directly provides the RF signal avoiding any non-ideal mixer stages and reduces the requirements of digital signal processing implemented in a field programmable gate array (FPGA). The transmitter consists basically of a multi-Nyquist digital to analog converter (DAC), whereas the implemented matched filter (MF) receiver prototype employs a standard digitizing oscilloscope. This design can be adaptively reconfigured in terms of modulation, data rate, and channel equalization. The reconfigurable design is used for an extensive performance analysis of the quadrature phase shift keying (QPSK) modulation scheme investigating the influence of different antennas, amplifiers, narrowband interferers as well as different equalizer lengths. Even for distances up to 7 m in a multipath environment robust communication was achieved.

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Ali, Majid, Ka‐Hong Loo, and Yuk‐Ming Lai. "Non‐intrusive parameter estimation method for autotuned DC–DC converter based on quasi‐impulse response." IET Power Electronics 11, no. 12 (August 31, 2018): 2019–28. http://dx.doi.org/10.1049/iet-pel.2018.5467.

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Sree, K. Radha, and Akshay Kumar Rathore. "Impulse Commutated Zero-Current Switching Current-Fed Push–Pull Converter: Analysis, Design, and Experimental Results." IEEE Transactions on Industrial Electronics 62, no. 1 (January 2015): 363–70. http://dx.doi.org/10.1109/tie.2014.2331029.

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Pu, Zi-Heng, Jiang-Jun Ruan, Ya-Dong Zhang, Zhi-Ye Du, and Qi-Jia Xie. "Wave Process in Scale-Down Model of UHVDC Converter Transformer Under the Lightning Impulse Voltage." IEEE Transactions on Magnetics 51, no. 11 (November 2015): 1–4. http://dx.doi.org/10.1109/tmag.2015.2438155.

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Liu, Zhen, Huan-yu Zhao, and Ying Cui. "Effects of rotor solidity on the performance of impulse turbine for OWC wave energy converter." China Ocean Engineering 29, no. 5 (October 2015): 663–72. http://dx.doi.org/10.1007/s13344-015-0047-6.

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Cuoghi, Stefania, Lorenzo Ntogramatzidis, Fabrizio Padula, and Gabriele Grandi. "Direct Digital Design of PIDF Controllers with ComPlex Zeros for DC-DC Buck Converters." Energies 12, no. 1 (December 23, 2018): 36. http://dx.doi.org/10.3390/en12010036.

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This paper presents a new direct digital design method for discrete proportional integral derivative PID + filter (PIDF) controllers employed in DC-DC buck converters. The considered controller structure results in a proper transfer function which has the advantage of being directly implementable by a microcontroller algorithm. Secondly, it can be written as an Infinite Impulse Response (IIR) digital filter. Thirdly, the further degree of freedom introduced by the low pass filter of the transfer function can be used to satisfy additional specifications. A new design procedure is proposed, which consists of the conjunction of the pole-zero cancellation method with an analytical design control methodology based on inversion formulae. These two methods are employed to reduce the negative effects introduced by the complex poles in the transfer function of the buck converter while exactly satisfying steady-state specifications on the tracking error and frequency domain requirements on the phase margin and on the gain crossover frequency. The proposed approach allows the designer to assign a closed-loop bandwidth without constraints imposed by the resonance frequency of the buck converter. The response under step variation of the reference value, and the disturbance rejection capability of the proposed control technique under load variations are also evaluated in real-time implementation by using the Arduino DUE board, and compared with other methods.

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Panteleev, V. I., I. S. Kuzmin, A. A. Zavalov, A. V. Tikhonov, and E. V. Umetskaia. "Power quality in power supply systems of mining and processing enterprises in Russia." Proceedings of Irkutsk State Technical University 25, no. 3 (July 6, 2021): 356–68. http://dx.doi.org/10.21285/1814-3520-2021-3-356-368.

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This paper investigates the effect of the load factor of frequency converters and thyristor converters on electrical power quality. Recommendations for reducing the influence of higher harmonics and switching overvoltages on the characteristics of electrical power are provided. Higher harmonics were measured by a PKK57 complex device for controlling electrical parameters and a digital oscilloscope of the Tektronix TDS 2024V type. Impulse switching overvoltages were recorded by an active resistance divider of the DNEK-10 type and the above-mentioned oscilloscope. The obtained data were processed by the Loginom 6.4 software and the methods of mathematical statistics. The lower threshold level of the load factor of frequency converters and thyristor converters was set equal to 0.8, at which the sinusoidal distortion of voltage curves correspond to the RF standard of electrical power quality. The suppression degree of higher harmonics from the 5th to 17th frequency by power transformers with a capacity of 250–6,300 kV. A ranged from 95 to 45%. The use of the ‘transformer–converter–electric receiver’ system as applied to the power supply systems of mining and processing enterprises was substantiated. It was shown that electric motors with a capacity of up to 2,500 kW inclusively require protection against switching overvoltages. Conventional RC-absorbers based on RC-circuits connected to the terminals of electric motors are shown to be highly efficient for protecting electric motors against switching overvoltages. Thus, the quality of electrical power in power supply systems of mining and processing enterprises in Russia can be ensured by frequency converters and thyristor converters with a load factor of 0.8 or greater. Provided that the transformer capacity does not exceed 1,000 kV. A, a more efficient and less expensive ‘transformer–converter–electrical receiver’ system is recommended. Effective protection of electric motors of up to 2,500 kW inclusive can be provided using the proposed conventional RC absorber, which maintains the overvoltage rate at a level not exceeding 1.7.

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Kong, Liu, Su, Ao, Chen, and Jing. "Analytical and Numerical Analysis of the Dynamics of a Moonpool Platform–Wave Energy Buoy (MP–WEB)." Energies 12, no. 21 (October 25, 2019): 4083. http://dx.doi.org/10.3390/en12214083.

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In this work the hydrodynamic performance of a novel wave energy converter configuration was analytically and numerically studied by combining a moonpool and a wave energy buoy, called the moonpool platform–wave energy buoy (MP–WEB). A potential flow, semi-analytical approach was adopted to assess the total (incident, diffraction, radiation) wave forces acting on the device, and the wave capture and energy efficiency performance of this configuration was assessed, both in the time and frequency domain. The performance of the two configurations, single float and double float, were analyzed and compared in terms of diffraction force, added mass radiation force, motion, and power in the frequency domain. Using an impulse response function-based (IRF) method, the frequency domain results were converted in the time domain. The same parameters in the time domain were derived and the main results were confirmed. Wave energy conversion efficiency was significantly increased due to the resonance phenomenon inside the moonpool.

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Nguyen, Chi Kien, R. S. Kashaev, and O. V. Kozelkov. "The impulse power unit for a portable proton magnet resonance relaxometer." Power engineering: research, equipment, technology 21, no. 6 (April 21, 2020): 111–17. http://dx.doi.org/10.30724/1998-9903-2019-21-6-111-117.

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In this paper described the switching power supply (SPS) unit and represented its importance for electronic circuits in electronic devices. SPS directly affect the operation of electrical circuits and electronic equipment. In particular, this paper describes its use in a portable proton-magnetic resonance (PMR) relaxometer. Especial attention is to the method of constructing the circuit, and also deals with the comparense of the SPS with a transformer power source. This article presents the structure of schematic diagram of the SPS. The SPS structure works without a transformer, which reduces the size of the system and increases overall efficiency. The proposed circuit structure is based on a push-pull controller, a high- frequency converter with an amplifier and a voltage multiplier circuit and a voltage stabilizer. The simulation and experiments confirm the proposed configuration of SPS.

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Zahangir, M., Sheroz Khan, I. Adam, K. Abdul Kadir, A. N. Nordin, and S. N. Ibrahim. "A Proposed Resistance-to-Time Converter with Switching Impulse Calibrators for Application in Resistive Bridge Sensors." Indonesian Journal of Electrical Engineering and Computer Science 11, no. 1 (July 1, 2018): 47. http://dx.doi.org/10.11591/ijeecs.v11.i1.pp47-50.

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This paper presents a simple resistance-to-time converter. It consists of two voltage comparators, a ramp voltage generator, two logic gates and impulse voltage calibrators. A square-wave generator circuit is suggested in this paper. The design is simple and independent of the OPAMP offset issues. The resulting square-wave is rectified to get its DC equivalent and to a triangular output; the two outputs are applied to a comparator for generating a digital output with a duty cycle proportional to a change in resistance upon which is dependent the DC.

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Dmitrikov, Vladimir F., Alexander Yu Petrochenko, and Andrey A. Rozanov. "Design features of negative feedback and power smoothing filter of the DC / DC converter with pulse loads for transmitter-receiver modules of active electronically scanned arrays." Physics of Wave Processes and Radio Systems 24, no. 1 (May 6, 2021): 78–88. http://dx.doi.org/10.18469/1810-3189.2021.24.1.78-88.

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The fundamental difference of the voltage converter of the secondary power supply source for the transmitter-receiver modules of active electronically scanned arrays with impulse load and variable duty cycle from traditional voltage converters that constantly consume power from the primary network is shown. Methods for improving the quality of transient processes in voltage converter with constant power consumption during start-up by soft start are not applicable to improve the quality of transients in periodic current pulses caused by a pulsed load. Since any ripples, noises, instabilities in the power supply of the transmitter-receiver modules of active electronically scanned arrays operating in a linear mode lead to parasitic amplitude modulation of the emitted signal and to a deterioration in the quality of selection and target tracking, very strict requirements are imposed on the quality of the transmitter-receiver modules supply voltage (voltage ripple kп 0,5 %, the amount of overshoot of the output voltage sU 2 %, etc.). The article shows that such a quality of the output voltage with a pulsed load of the transmitter-receiver modules of active electronically scanned arrays can be obtained using a lower-type voltage converter, with a double-circuit negative feedback for the output voltage and current of the inductor, with a storage capacitor and with a power smoothing filter with the characteristics of Chebyshev and Butterworth. The work investigated the influence of the negative feedback depth on the output voltage and current of the smoothing filter choke, the value of the storage capacitor capacity, the type and parameters of the smoothing filter, and recommendations were given to select their optimal values, at which the required quality of the supply voltage for the transmitter-receiver modules of active electronically scanned arrays was ensured, taking into account the minimization of their dimensions.

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Ott, A. T., C. J. Eisner, M. D. Blech, and T. F. Eibert. "Reconfigurable ultra-wideband transmitter for generation of arbitrary impulse shapes and modulation schemes." Advances in Radio Science 10 (September 18, 2012): 57–62. http://dx.doi.org/10.5194/ars-10-57-2012.

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Abstract. In this paper a reconfigurable ultra-wideband (UWB) impulse radio (IR) transmitter is presented. The IR signal is synthesized at an intermediate frequency (IF) by employing a multi-Nyquist digital-to-analog converter (DAC) with 12 bit resolution and an update rate of 2.3 GHz. Digital generation of signals in a field programmable gate array (FPGA) guarantees very high flexibility of the reconfigurable design. For upconversion to the radio frequency (RF) band, a first order bandpass (BP) sampling concept and an alternative conventional concept with mixer stages, have been realized. The system enables to generate signals with arbitrary modulation schemes and techniques at an external host personal computer (PC) employing MATLAB. Different measurements using a digitizing oscilloscope have been conducted to demonstrate the performance of the transmitter.

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Jones, F. H. M., B. B. Narod, and G. K. C. Clarke. "A Back-Portable Microprocessor-Based Impulse Radar System." Annals of Glaciology 9 (1987): 238. http://dx.doi.org/10.1017/s0260305500000732.

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We have developed and tested a portable impulse radar for ground-based sounding of glaciers. Noteworthy characteristics of the instrument are its portability, low power consumption, digital data storage, and the ability to be operated either manually or automatically under program control. Current system specifications include a band width of 46 MHz; a sampling interval of 10.76 ns; depth precision of 0.9 m; 1024 samples per record; amplitude resolution of 8 bits; minimum recordable signal at the receive antenna equal to 0.26 mV; an operating center frequency of 8.5 MHz and an antenna-damping coefficient of 300 ohms. The transmitter uses paired SCRs and a 12 V to 800 V converter to impress a 1200 V step on to a resistively damped dipole antenna. This pulse is triggered from the receiving system via a fibre optics cable so that each record can include the complete surface-path wavelet. The receiver unit combines a wide-band amplifier (with variable front-end attenuation) with a microprocessor-controlled data-acquisition system of our own design. The result of each sounding can be replayed as an “A-scope” display on a small, low-cost oscilloscope and stored on or retrieved from digital cassettes. In the unattended mode, records are collected at programmable intervals. The system weighs about 7.5 kg and uses dry cells or rechargeable batteries for power. Examples were presented in a poster session of sounding profiles taken in July 1986 on Trapridge Glacier, Yukon Territory in Canada, along lines coinciding with an extensive drilling program. Although not yet fully analysed, we feel that some of the results may represent the effects of crevasses, internal features such as morainal material, varying bed features, and changes in subglacial and englacial hydrology.

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Jones, F. H. M., B. B. Narod, and G. K. C. Clarke. "A Back-Portable Microprocessor-Based Impulse Radar System." Annals of Glaciology 9 (1987): 238. http://dx.doi.org/10.3189/s0260305500000732.

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We have developed and tested a portable impulse radar for ground-based sounding of glaciers. Noteworthy characteristics of the instrument are its portability, low power consumption, digital data storage, and the ability to be operated either manually or automatically under program control. Current system specifications include a band width of 46 MHz; a sampling interval of 10.76 ns; depth precision of 0.9 m; 1024 samples per record; amplitude resolution of 8 bits; minimum recordable signal at the receive antenna equal to 0.26 mV; an operating center frequency of 8.5 MHz and an antenna-damping coefficient of 300 ohms.The transmitter uses paired SCRs and a 12 V to 800 V converter to impress a 1200 V step on to a resistively damped dipole antenna. This pulse is triggered from the receiving system via a fibre optics cable so that each record can include the complete surface-path wavelet. The receiver unit combines a wide-band amplifier (with variable front-end attenuation) with a microprocessor-controlled data-acquisition system of our own design. The result of each sounding can be replayed as an “A-scope” display on a small, low-cost oscilloscope and stored on or retrieved from digital cassettes. In the unattended mode, records are collected at programmable intervals. The system weighs about 7.5 kg and uses dry cells or rechargeable batteries for power.Examples were presented in a poster session of sounding profiles taken in July 1986 on Trapridge Glacier, Yukon Territory in Canada, along lines coinciding with an extensive drilling program. Although not yet fully analysed, we feel that some of the results may represent the effects of crevasses, internal features such as morainal material, varying bed features, and changes in subglacial and englacial hydrology.

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Choi, Changhyung, and Jong-Wook Lee. "An 11.8-fJ/Conversion-Step Noise Shaping SAR ADC with Embedded Passive Gain for Energy-Efficient IoT Sensors." Sensors 22, no. 3 (January 24, 2022): 869. http://dx.doi.org/10.3390/s22030869.

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Herein, we present a noise shaping successive-approximation-register (SAR) analog-to-digital converter (ADC) with an embedded passive gain multiplication technique. The noise shaping moves the in-band quantization noise from the signal band to out-of-band for improved signal-to-noise ratio (SNR). The proposed approach tackles the drawback of the previous active noise shaping (increased power and extra noise) and passive noise shaping (limited noise suppression and signal loss). Both noise shaping and gain multiplication are realized on-chip in an energy-efficient manner without an opamp. This approach uses only capacitors and switches in the finite impulse response (FIR) and infinite impulse response (IIR) filters. A comparator suppressing kickback noise is presented to handle the tradeoff between noise suppression and the filter capacitor size. The energy-efficient merged-capacitor switching (MCS) technique is effectively combined with rail-to-rail swing comparator and thermometer-coded capacitor array, which reduces the settling error in the digital to analog converter (DAC). The process-induced mismatch effect in the capacitive DAC is investigated using a behavioral model of the ADC. Additionally, we propose dynamic element matching (DEM) for the thermometer-coded capacitor array. The ADC is fabricated using a 0.18 μm CMOS process in an area of 0.26 mm2. Consuming 4.1 μW, the ADC achieves a signal-to-noise and distortion ratio (SNDR) of 66.5 dB and a spurious-free dynamic range (SFDR) of 79.1 dB. The figure-of-merit (FoM) of the ADC is 11.8 fJ/conversion-step.

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Kranjec, Bojan, Sasa Sladic, Wojciech Giernacki, and Neven Bulic. "PV System Design and Flight Efficiency Considerations for Fixed-Wing Radio-Controlled Aircraft—A Case Study." Energies 11, no. 10 (October 3, 2018): 2648. http://dx.doi.org/10.3390/en11102648.

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The list of photovoltaic (PV) applications grows longer every day with high consideration for system efficiency. For instance, in spite of many recent PV aircraft designs, aircraft propulsion was mainly reserved for nonelectric motors. Lately, the Solar Impulse flight across the world shows the possibilities of larger PV powered electric aircraft. In order to obtain this goal efficiency of flight, PV conversion, power converters and electric drives have to be maximized. These demands led to a 63.4 m wingspan. The purpose of this paper is to present that PV power could be used for improving the performance of fixed-wing radio-controlled aircrafts with smaller wingspans (1 m). In order to improve the performance of battery powered electric unmanned aerial vehicles (UAV), a model without PV cells (commercial Li-ion battery powered UAV) was compared with UAV powered both from battery and PV modules. This work shows details about Boost DC/DC converter and PV system design for small size fixed-wing electric UAVs, investigating the possibility of the application of PV powered drones, as well. Theoretical findings involving efficiency improvements have been confirmed by measurements combining the improvements in electrical engineering, microcontroller application and aerodynamics.

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Yang, Dingqian, Weining Zhang, Guanghu Xu, Tiangeng Li, Jiexin Shen, Yunkai Yue, and Shuaibing Li. "Partial Discharge Pulse Segmentation Approach of Converter Transformers Based on Higher Order Cumulant." Energies 15, no. 2 (January 6, 2022): 415. http://dx.doi.org/10.3390/en15020415.

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As one of the most effective methods to detect the partial discharge (PD) of transformers, high frequency PD detection has been widely used. However, this method also has a bottleneck problem; the biggest problem is the mixed pulse interference under the fixed length sampling. Therefore, this paper focuses on the study of a new pulse segmentation technology, which can separate the partial discharge pulse from the sampling signal containing impulse noise so as to suppress the interference of pulse noise. Based on the characteristics of the high-order-cumulant variation at the rising edge of the pulse signal, a method for judging the starting and ending time of the pulse based on the high-order-cumulant is designed, which can accurately extract the partial discharge pulse from the original data. Simulation results show that the location accuracy of the proposed method can reach 94.67% without stationary noise. The field test shows that the extraction rate of the PD analog signal can reach 79% after applying the segmentation method, which has a great improvement compared with a very low location accuracy rate of 1.65% before using the proposed method.

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Sree, K. Radha, and Akshay Kumar Rathore. "Analysis and Design of Impulse-Commutated Zero-Current-Switching Single-Inductor Current-Fed Three-Phase Push–Pull Converter." IEEE Transactions on Industry Applications 53, no. 2 (March 2017): 1517–26. http://dx.doi.org/10.1109/tia.2016.2626248.

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Sree, K. Radha, and Akshay Kumar Rathore. "Impulse Commutated High-Frequency Soft-Switching Modular Current-Fed Three-Phase DC/DC Converter for Fuel Cell Applications." IEEE Transactions on Industrial Electronics 64, no. 8 (August 2017): 6618–27. http://dx.doi.org/10.1109/tie.2016.2620423.

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Zhao, Yijiu, Houjun Wang, and Zhijian Dai. "Model calibration of non-ideal lowpass filter in modulated wideband converter for compressive sampling." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 34, no. 3 (May 5, 2015): 941–51. http://dx.doi.org/10.1108/compel-06-2014-0138.

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Purpose – The purpose of this paper is to present a model calibration technique for modulated wideband converter (MWC) with non-ideal lowpass filter. Without making any change to the system architecture, at the cost of a moderate oversampling, the calibrated system can perform as the system with ideal lowpass filter. Design/methodology/approach – A known test sparse signal is used to approximate the finite impulse response (FIR) of the practical non-ideal lowpass filter. Based on the approximated FIR filter, a digital compensation filter is designed to calibrate the practical filter. The calibrated filter can meet the perfect reconstruction condition. The non-ideal sub-Nyquist samples are filtered by a compensation filter. Findings – Experimental results indicate that, by calibrating the MWC with the proposed algorithm, the impaction of non-ideal lowpass filter could be avoided. The performance of signal reconstruction could be improved significantly. Originality/value – Without making any change to the MWC architecture, the proposed algorithm can calibrated the non-ideal lowpass filter. By filtering the non-ideal sub-Nyquist samples with the designed compensation filter, the original signal could be reconstructed with high accuracy.

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Bolyukh, V. F., Yu V. Kashansky, and I. S. Schukin. "Features of excitation of a linear electromechanical converter of induction type from an AC source." Electrical Engineering & Electromechanics, no. 1 (February 23, 2021): 3–9. http://dx.doi.org/10.20998/2074-272x.2021.1.01.

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Purpose. The purpose of the article is to establish the basic laws of operation of induction-type linear electromechanical converter (LEMС) during operation in high-speed and shock-power modes and excitation from an AC source of increased frequency. Methodology. With the help of a mathematical model, the regularities of the course of processes in a LEMС, excited from an AC source, were established when working with shock-power and high-speed modes. The solutions of the equations of the mathematical model, which describe interrelated electrical, magnetic, mechanical and thermal processes, are presented in a recurrent form. Results. It was found that when the LEMC operates in the shock-power mode, the maximum value of the current in the inductor winding occurs in the first half-period, and in the inhibited armature winding in the second half-period. The electrodynamic force changes at twice the frequency, taking on both positive and negative values. Since the positive values exceed the negative ones, the magnitude of the impulse of the electrodynamic force increases with each period of the force. Depending on the initial voltage phase, the relative change in the magnitude of the force impulse is 1.5 %. It was found that when the LEMC operates in high-speed mode, the current in the inductor winding in the first half-period has the greatest value, but after several periods it takes on a steady state. The temperature rise of the inductor winding increases with the time of connection to the AC source, and the temperature rise of the armature winding has the nature of saturation. The electrodynamic force has an oscillatory character with strong damping and a significant predominance of the positive component. Depending on the initial phase of the voltage, the relative change in the maximum speed of the armature winding is 2.5 %. Originality. For the first time, a mathematical model of the LEMC, excited from an AC source, was developed, the solutions of the equations of which describe the interrelated electrical, magnetic, mechanical and thermal processes. For the first time, the regularities of the course of processes in LEMC were established when working with shock-power and high-speed modes. Practical value. The characteristics of LEMC are obtained, which determine the efficiency of work in shock-power and high-speed modes. It is shown that the initial voltage phase has no significant effect on the power, high-speed thermal performance of the converter excited from an alternating current source.

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Kim, Kilwon, Keyyong Hong, Kyong-Hwan Kim, and Beom-Soo Hyun. "Design and Performance Analysis of Impulse Turbine for 30 kW-class OWC-type Wave Energy Converter Installed at Breakwater." Journal of the Korean Society for Marine Environment & Energy 22, no. 3 (August 25, 2019): 182–89. http://dx.doi.org/10.7846/jkosmee.2019.22.3.182.

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Wang, Qiang, Yang Yue, Jian Yao, and Jon Anderson. "Adaptive Compensation of Bandwidth Narrowing Effect for Coherent In-Phase Quadrature Transponder through Finite Impulse Response Filter." Applied Sciences 9, no. 9 (May 13, 2019): 1950. http://dx.doi.org/10.3390/app9091950.

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Coherent in-phase quadrature (IQ) transponders are ubiquitous in the long-haul and the metro optical networks. During the transmission, the coherent signal experiences a bandwidth narrowing effect after passing through multiple reconfigurable optical add-drop multiplexers (ROADMs). The coherent signal also experiences a bandwidth narrowing effect when electrical or optical components of the coherent IQ transponder experience aging. A dynamic method to compensate the bandwidth narrowing effect is thus required. In the coherent optical receiver, signal bandwidth is estimated from the raw analog-to-digital converter (ADC) outputs. By adaptively adjusting the tap coefficients of the finite impulse response (FIR) filter, simple post-ADC FIR filters can increase the resiliency of the coherent signal to the bandwidth narrowing effect. The influence of chromatic dispersion, polarization mode dispersion, and polarization dependent loss are studied comprehensively. Furthermore, the bandwidth information of the transmitted analog signal is fed back to the coherent optical transmitter for signal optimization, and the transmitter-side FIR filter thus changes accordingly.

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Tseng, Shao-Ting, Hao-Chung Chou, Bo-Syun Hu, Yu-Hsien Kao, Yuan-Hao Huang, and Ta-Shun Chu. "Equivalent-Time Direct-Sampling Impulse-Radio Radar With Rotatable Cyclic Vernier Digital-to-Time Converter for Wireless Sensor Network Localization." IEEE Transactions on Microwave Theory and Techniques 66, no. 1 (January 2018): 485–508. http://dx.doi.org/10.1109/tmtt.2017.2718510.

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Tankeliun, Tomaš. "RESEARCH OF RELATION OF SAMPLERS FREQUENCY CHARACTERISTICS." Mokslas - Lietuvos ateitis 13 (August 19, 2021): 1–5. http://dx.doi.org/10.3846/mla.2021.15215.

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The approach to reduce the amplitude noise of a vertical channel of the sampling oscilloscope is presented in this paper. In general, the vertical channel of the sampling oscilloscope consists of a high-frequency sampling circuit and a relatively low-frequency sample transmission path along with a high bit resolution analogto-digital converter. The paper presents a method to improve the sensitivity of the vertical channel of a stroboscopic oscilloscope by extending the conventional channel architecture. The main vertical channel unit of the oscilloscope is a sampling device (sampler), which made of discrete elements and usually implemented using high frequency diodes. The sampler performs a transformation of the sample of the high-frequency signal under test into a low-frequency equivalent signal (otherwise called a balance impulse). In a conventional sampling device, this pulse is quantized once the amplitude is at its highest, thus achieving the best signal-to-noise ratio. The paper analyzes the operating parameters of the sampling device circuit and their influence on the output signal of the sampler. In this approach uses the fastest (15 MHz) high-resolution (18-bit) analog-to-digital converters currently on the market to reduce the amplitude noise of vertical channel based on conventional architecture. Our research has shown that it is possible to obtain an increase in the signal-tonoise ratio of almost 1.3 times.

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Journal articles on the topic 'Impulse converter'

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