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Journal articles on the topic 'Voltage ratios'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

Arbutina, Dalibor, Aleksandra Vasić-Milovanović, and Uroš Kovačević. "Probabilistic analysis of voltage divider ratios." FME Transactions 47, no. 3 (2019): 624–33. http://dx.doi.org/10.5937/fmet1903624a.

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2

Galliana, Flavio, Pier Paolo Capra, Roberto Cerri, and Marco Lanzillotti. "Automated precision DC voltage fixed ratios divider." Measurement 122 (July 2018): 291–96. http://dx.doi.org/10.1016/j.measurement.2018.03.045.

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3

Punith Kumar Y. "A New Ultra-Gain Step-Up Converter with Continuous Input Current for Micro-Grid Applications." Journal of Electrical Systems 20, no. 10s (2024): 2314–25. http://dx.doi.org/10.52783/jes.5578.

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For green energy micro-grid applications, it is crucial to have a step-up converter that can produce a wide range of voltages. This converter is necessary to match the low voltage output of the micro-grid with the DC-bus voltage and must have continuous input current. A new ultra-gain step-up converter with continuous input current, is proposed to achieve this objective. The proposed converter is a non-coupled inductor-based, non-isolated boost converter with continuous input current which is suitable to operate at a high voltage suitable for green energy based micro-grid applications. The pro

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Ragheb, A., and Hyung Kim. "Reference-Free Dynamic Voltage Scaler Based on Swapping Switched-Capacitors." Energies 12, no. 4 (2019): 625. http://dx.doi.org/10.3390/en12040625.

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This paper introduces a reference-free, scalable, and energy-efficient dynamic voltage scaler (DVS) that can be reconfigured for multiple outputs. The proposed DVS employs a novel swapping switched-capacitor (SSC) technique, which can generate target output voltages with higher resolution and smaller ripple voltages than the conventional voltage scalers based on switched-capacitors. The proposed DVS consists of a cascaded 2:1 converter based on swapping capacitors, which is essential to achieve both very small voltage ripple and fine-grain conversion ratios. One of the serious drawbacks of the

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Jabberi, Henda, and Faouzi Ben Ammar. "New advanced concept of the flying capacitor asymmetric multilevel voltage source inverter." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 37, no. 3 (2018): 1166–88. http://dx.doi.org/10.1108/compel-04-2017-0168.

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Purpose To improve the voltage quality in AC adjustable high-power-speed-drive applications, the purpose of the paper is to provide a large number of output levels without increasing the number of commutation cells in the three-phase, n-cells flying capacitor voltage source asymmetric Multilevel Inverter (MI). The concept is based on the selection of different ratios between the breakdown voltages of two successive power devices. The new mathematical model is developed under various ratios, allows a thorough investigation of the harmonic distortions, flying capacitor energy storage, flying cap

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Lv, Caifeng, Xiujie Huang, and Shancheng Zhao. "A Nonuniform Reference Voltage Optimization Based on Relative-Precision-Loss Ratios in MLC NAND Flash Memory." Computer and Information Science 14, no. 2 (2021): 75. http://dx.doi.org/10.5539/cis.v14n2p75.

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In Multi-Level-Cell (MLC) NAND flash memory, cell-to-cell interference (CCI) and retention time have become the main noise that degrades the data storage reliability. To mitigate such noise, a relative precision loss (RPL) nonuniform reference voltage sensing strategy is proposed in this paper. First, based on the NAND flash channel model with CCI and retention noise, we simulate the data storage process of MLC NAND flash by Monte Carlo method, and find that the threshold-voltage of each disturbed storage state shows approximately to be Gaussian distributed. Then, by Gaussian approximation, th

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Di Fazio, Anna, Mario Russo, and Michele De Santis. "Zoning Evaluation for Voltage Optimization in Distribution Networks with Distributed Energy Resources." Energies 12, no. 3 (2019): 390. http://dx.doi.org/10.3390/en12030390.

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This paper deals with the problem of the voltage profile optimization in a distribution system including distributed energy resources. Adopting a centralized approach, the voltage optimization is a non-linear programming problem with large number of variables requiring a continuous remote monitoring and data transmission from/to loads and distributed energy resources. In this study, a recently-proposed Jacobian-based linear method is used to model the steady-state operation of the distribution network and to divide the network into voltage control zones so as to reformulate the centralized opt

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Štumberger, Nina, Gorazd Štumberger, and Matej Pintarič. "THE IMPACT OF UNBALANCED POWER SUPPLY ON LOAD CURRENTS IN TRANSIENT AND STEADY-STATE OPERATION." Journal of Energy Technology 15, no. 1 (2023): 23–50. https://doi.org/10.18690/jet.15.1.23-50.2022.

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The impact of unbalanced power supply voltages on power derating, increases in current values and the heat released from electrical machines and devices is typically analysed in quasi-steadystate operation using sequence components. The ratios between the negative and positive sequence voltage and the homopolar (zero) and positive sequence voltage are used to evaluate the level of voltage unbalance. This paper proposes an extension of this approach that includes subtransient, transient and quasi-steady-state operation of wye (grounded and ungrounded) and delta connected loads, consisting of re

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Ali, E., A. Helal, H. Desouki, K. Shebl, S. Abdelkader, and O. P. Malik. "Power transformer differential protection using current and voltage ratios." Electric Power Systems Research 154 (January 2018): 140–50. http://dx.doi.org/10.1016/j.epsr.2017.08.026.

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10

Gong, Renxi, and Yuan Feng. "The Voltage Balance Control Strategy of Static Var Generators DC-Side Capacitors Based on Fuzzy-PI Adaptive Cascaded H-bridge." Electronics 12, no. 1 (2022): 39. http://dx.doi.org/10.3390/electronics12010039.

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A voltage balance control strategy based on the fuzzy adaptive PI (Proportional Integral control) is proposed to address the problem of unbalanced capacitor voltage on the DC side of cascaded H-bridge static var generators (SVG). In the control strategy, fuzzy control is introduced based on PI control. A duty ratio correction is added to all levels’ public active power duty ratios, thereby realizing the balance of DC-side voltages at all levels. A test was conducted by building a single-phase three-H-bridge unit cascaded SVG simulation platform. The results show that the DC-side voltage balanc

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11

Ado, Muhammad, Awang Jusoh, Tole Sutikno, Mohd Hanipah Muda, and Zeeshan Ahmad Arfeen. "Dual output DC-DC quasi impedance source converter." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 4 (2020): 3988. http://dx.doi.org/10.11591/ijece.v10i4.pp3988-3998.

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A double output port DC-DC quasi impedance source converter (q-ZSC) is proposed. Each of the outputs has a different voltage gain. One of the outputs is capable of bidirectional (four-quadrant) operation by only varying the duty ratio. The second output has the gain of traditional two-switch buck-boost converter. Operation of the converter was verified by simulating its responses for different input voltages and duty ratios using MATLAB SIMULINK software. Its average steady-state output current and voltage values were determined and used to determine the ripples that existed. These ripples are

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Muhammad, Ado, Jusoh Awang, Sutikno Tole, Hanipah Muda Mohd, and Ahmad Arfeen Zeeshan. "Dual output DC-DC quasi impedance source converter." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 4 (2020): 3988–98. https://doi.org/10.11591/ijece.v10i4.pp3988-3998.

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A double output port DC-DC quasi impedance source converter (q-ZSC) is proposed. Each of the outputs has a different voltage gain. One of the outputs is capable of bidirectional (four-quadrant) operation by only varying the duty ratio. The second output has the gain of traditional two-switch buck-boost converter. Operation of the converter was verified by simulating its responses for different input voltages and duty ratios using MATLAB SIMULINK software. Its average steady-state output current and voltage values were determined and used to determine the ripples that existed. These ripples are

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13

Gordillo, Jorge A. "Conceptual Design: High-Voltage Transformer." Advanced Engineering Forum 45 (April 4, 2022): 49–56. http://dx.doi.org/10.4028/p-7p5c59.

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This paper shown and describe this behaviour an original conceptual design of an electrical transformer. The device it is constituted by an electrodynamic actuator and piezoelectric crystals.The input AC voltage generates an axial vibration in the electrodynamic actuator. The axial vibration is transmitted to a piezoelectric crystal which is polarized in the axial direction and generates the output voltage. In a reduced volumes and a single step, it would be possible to reach voltages of tens of MV and great transformation ratios-achieving these voltages is impossible with conventional systems

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Dr., N. Archana, R. Latha Dr, and Kumar M. Manoj. "A Non-Isolated DC-DC Converter with High Voltage Gain for Microgrid Applications." Advancement of Signal Processing and its Applications 7, no. 2 (2024): 1–8. https://doi.org/10.5281/zenodo.10948416.

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<em>The incorporation of sustainable energy resources such as solar and fuel cells into DC microgrids is one of their main selling points. These dc power sources have low output voltages, therefore in order to link the dc microgrid, high gain dc-dc converters are needed. Two non-isolated inductors are used in the suggested topology, and they are coupled serially or parallelly during discharging and charging modes. The fundamental benefit of these type of converter is it operates switches for two distinct duty ratios, allowing for significant voltage gain without the need of an excessive duty r

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Akhmetbayev, Dauren S., Abdigali R. Dzhandigulov, and Svetlana V. Bystrova. "Topological system method of formation of transformer transformation coefficients." E3S Web of Conferences 216 (2020): 01087. http://dx.doi.org/10.1051/e3sconf/202021601087.

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A systematic approach to determining the control range of the on-load tap-changer of transformers from the standpoint of the synthesis of the voltage mode is proposed. Transformations of the equation of nodal voltages, formalized on the basis of the topology of a complex electrical network, with respect to the transformation ratios of transformers are given.

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16

Velliyangiri, B., R. Dharaneesh, G. Bala Surya, T. Ragul Kannan, and K. Boopathi. "Enhancing Electric Vehicle Efficiency with a Novel SIMO DC-DC Converter: Integrating Multiple Speed Transmissions and Regenerative Braking." E3S Web of Conferences 547 (2024): 03011. http://dx.doi.org/10.1051/e3sconf/202454703011.

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An innovative single-input multi-output (SIMO) Direct Current (DC)-DC switched capacitor (SC) converter charged and discharged the flying capacitors by utilising one separate independent voltage source (Vbat or Vin) to control the EV's speed. The switching pulse interval remained constant, allowing for the generation of different voltage ratios. To regulate the velocities of EV, this study developed a number of speed transmissions. Utilising the SIMO DC-DC converter, the chosen and controlled battery voltage was produced. For motoring, or forwarding operation, four transmissions were used, whi

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17

Jain BS, Samarth, Samarth N, and S Praveen. "Design of Voltage Regulator in Biomedical Application." International Journal of All Research Education & Scientific Methods 12, no. 08 (2024): 2416–23. http://dx.doi.org/10.56025/ijaresm.2024.1208242416.

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All electronic devices require operation at prede-fined voltages, making voltage regulators essential in biomedical applications for providing constant voltage regardless of input fluctuations or load changes. Without regulation, devices risk damage from unregulated voltage, potentially leading to malfunc- tion or reduced reliability. Voltage regulators ensure electronic component’s proper functioning and longevity by maintaining stable voltage levels. This work presents the design of a modified voltage regulator for biomedical applications. The study analyzes various architectures for high po

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18

Lee, Ming-Chan, Guan-Ying Lin, Zheng-Yu Hoe, and Cheng-Tang Pan. "Development of Piezoelectric Silk Sensors Doped with Graphene for Biosensing by Near-Field Electrospinning." Sensors 22, no. 23 (2022): 9131. http://dx.doi.org/10.3390/s22239131.

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A novel piezoelectric fiber sensor based on polyvinylidene fluoride piezoelectric (PVDF) doped with graphene is presented. The near-field electrospinning technology was used for developing the sensor. The uniform experimental design method was introduced to determine the ranges of experimental parameters, including the applied voltage, the drum speed range, the graphene doping ratios from 0% to 11 wt% in PVDF solution, and the electrode gap. By experimental results, the conductivities of PVDF solutions with different doping ratios of graphene increased from 19.6 μS/cm to 115.8 μS/cm. Tapping t

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19

Wu, Wanbao, Qing Li, Miaomiao Cao, et al. "Non-Flammable Dual-Salt Deep Eutectic Electrolyte for High-Voltage Lithium Metal Battery." Crystals 12, no. 9 (2022): 1290. http://dx.doi.org/10.3390/cryst12091290.

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The application of high voltage cathode electrode materials is an effective way to increase the energy density of batteries. However, the development and design of a stable electrolyte at high voltages needs to be further addressed. Herein, we developed a non-flammable dual-salt deep eutectic solvent (DES) as a safe electrolyte containing LiTFSI, LiDFOB, and succinonitrile in different molar ratios. This non-flammable DES provides high ionic conductivity (4.23 mS cm−1) at 25 °C, high Li+ transference number (0.75), and wide electrochemical stability (>5.5 V). When using the designed DES ele

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20

Hoffer, Barak, Vikas Rana, Stephan Menzel, and Shahar Kvatinsky. "Experimental Demonstration of Memristor-Aided Logic (MAGIC) Using Valence Change Memory (VCM)." IEEE Transactions on Electron Devices 67 (August 8, 2020): 3115–22. https://doi.org/10.1109/ted.2020.3001247.

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Memristor-aided logic (MAGIC) is a technique for performing in-memory computing using memristive devices. The design of a MAGIC NOR gate has been described in detail, and it serves as the basic building block for several processing-in-memory architectures. However, the input stability of the MAGIC NOR gate forces a limitation on the threshold voltages: the magnitude of the set voltage must be higher than the magnitude of the reset voltage. Unfortunately, many of the current leading resistive switching technologies, particularly, valence change memory (VCM), have the opposite ratio between the

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21

Tiguntsev, S. G., S. B. Akhmedov, and S. B. Usmonov. "Development of measures to reduce grid energy losses in the Namangan Region of Uzbekistan." iPolytech Journal 26, no. 3 (2022): 508–18. http://dx.doi.org/10.21285/1814-3520-2022-3-508-518.

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The paper is aimed at developing technical and organizational measures to reduce the losses of electrical energy during its transmission via main and distribution electrical grids, in power transformers and electric power trans-mission lines. The focus of the study was on electrical grid modes in the Namangan Region of Uzbekistan (voltages of 220/110/35/10/6 kV), which were analyzed via technological calculation-based research methods using an equivalent circuit representing the linear circuit currently employed in the regional electric energy system. In addition, electrical grids were simulat

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22

Uno, Masatoshi, Koyo Iwasaki, and Koki Hasegawa. "Series-Parallel Reconfiguration Technique with Voltage Equalization Capability for Electric Double-Layer Capacitor Modules." Energies 12, no. 14 (2019): 2741. http://dx.doi.org/10.3390/en12142741.

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Voltage variations of electric double-layer capacitors (EDLCs) are rather wider than those of traditional rechargeable batteries, and an energy utilization ratio of EDLCs is dependent on cells’ voltage variation ranges. To satisfactorily utilize EDLCs’ energies, voltages of EDLC modules should be within a certain range, while cells need to be charged and discharged over the wide voltage range. To this end, various kinds of series-parallel reconfiguration techniques based on balance- and unbalance-shift circuits have been proposed, but conventional techniques can only be applied to modules cons

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Norris, Joseph D., and Ndaona Chokani. "Rapid Scanning of Overheat Ratios Using a Constant Voltage Anemometer." AIAA Journal 41, no. 8 (2003): 1619–21. http://dx.doi.org/10.2514/2.2122.

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Penin, Alexandr, and Anatolie Sidorenko. "Invariant sample-and-hold amplifier to the hold capacitor discharge." Moldavian Journal of the Physical Sciences 20, no. 2 (2022): 170–75. http://dx.doi.org/10.53081/mjps.2021.20-2.08.

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The conventional measurement signal sample-and-hold amplifier comprising a sample and hold circuit in the form of a sample switch, a voltage hold capacitor, and a voltage repeater further includes two similar sample-and-hold circuits of reference voltages. The idea of the proposed amplifier is that hold capacitors are equally discharged in all three sample-and-hold circuits. Therefore, an affine ratio for the stored three voltage samples does not change the intrinsic value over a long discharge time. Then, this invariant affine ratio is taken as the measuring signal. A reproducing (recovery) u

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BHATTACHARYYA, KAUSHIK, P. V. RATNA KUMAR, and PRADIP MANDAL. "IMPROVEMENT OF POWER EFFICIENCY AND OUTPUT VOLTAGE RIPPLE OF EMBEDDED DC–DC CONVERTERS WITH THREE STEP DOWN RATIOS." Journal of Circuits, Systems and Computers 21, no. 01 (2012): 1250007. http://dx.doi.org/10.1142/s0218126612500077.

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In this paper three embedded switched capacitor based DC–DC converters targeting Vdd/2, 2Vdd/3, and Vdd/3 output voltages have been designed with improved power efficiency and output voltage ripple. The performance of each of the converter is improved by nonoverlapped rotational time interleaving (NRTI) switching scheme. Current regulation scheme is included with each of the above NRTI switched capacitor converter to achieve better load and line regulation. The proposed converters are designed and simulated in a 0.18 μm n-well CMOS process with the total flying capacitance of 330 pF and load c

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Byun, Hyung-Jun, Jung-Min Park, Junsin Yi, and Chung-Yuen Won. "Zero-Voltage-Switching Analysis Model of the Triple-Active-Bridge Converter." Energies 16, no. 23 (2023): 7763. http://dx.doi.org/10.3390/en16237763.

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This study aims to analyze the zero-voltage-switching (ZVS) region of a Triple-Active-Bridge (TAB) converter with five degrees of freedom. A TAB converter is an isolated converter derived from a dual-active-bridge (DAB) converter and composed of three full bridges (FBs) coupled to three winding transformers. To reduce the switching loss of the 12 active switches that compose 3 FBs, the ZVS operation is essential. However, owing to the numerous operation modes derived by five-phase shift ratios, ZVS analysis is complicated, particularly in the time domain. Therefore, this study presents the ZVS

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John, Joy, Gibi Meenu, Kuruvilla Jisha, and Susan Eldo Honey. "Modified Interleaved High Gain DC/DC Converter." International Journal of Innovative Science and Research Technology 7, no. 10 (2022): 1999–2005. https://doi.org/10.5281/zenodo.7353108.

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In recent years, DC distribution systems are gainingmore attention because of their high efficiency, reliability com- pared to AC distribution systems. Integration of lower voltage range renewable energy sources into 400 V dc bus is one of the major challenges to be faced by the power electronic converters. Typical voltage ranges of a solar panel is around20- 30V . Conversion of these voltages to higher voltage rangeby normal boost converters with high duty ratios results in high voltage stresses and lesser efficiency. Since, the output DC voltage from the photovoltaic panel is very low, so a

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Hinov, Nikolay. "A Unified Approach to the Analysis of DC/AC Converters, Based on the Study of Electromagnetic Processes in a Series RLC Circuit." Electronics 12, no. 4 (2023): 983. http://dx.doi.org/10.3390/electronics12040983.

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This paper presents a unified approach to the analysis of DC/AC converters based on an equivalent representation of their AC circuit as a series RLC circuit. The resonant DC/AC converter with reverse diodes was chosen as the basis of the examination, and the obtained ratios for this device were used to derive the main ratios describing the operation of the other types of DC/AC converters—voltage source inverters (VSI) and current source inverters (CSI). Based on the commonality of electromagnetic processes in power circuits, the expressions for the current through the inductance and the voltag

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Soomro, Amir M., Shahnawaz F. Khahro, and Xiao Zhong Liao. "Simulation for the Control Strategy of Three-Phase Boost-Half-Bridge (BHB) DC-DC Converter with Series Voltage Doubler Rectifiers through Three-Phase High Frequency Transformer." Applied Mechanics and Materials 325-326 (June 2013): 533–37. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.533.

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This paper presents simulation for the control strategy of three-phase boost-half-bridge (BHB) DC-DC converter with series voltage doubler rectifiers through three-phase high frequency transformer. The control strategy is consisting of three voltage loops. All the three voltage loops are independent of the input side and controls the input and output power balance from the secondary side of the high frequency transformers only. Moreover, the control strategy has been verified for its appropriate operation by simulating the above said configuration for the same turn ratios as well as for the mi

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Khwan-On, Sudarat, and Sopida Vatcharasukpo. "Analysis and Simulation of a High Step-Up DC-DC Converter for Renewable Energy System Applications." Applied Mechanics and Materials 775 (July 2015): 378–82. http://dx.doi.org/10.4028/www.scientific.net/amm.775.378.

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This paper proposes a new step-up DC-DC converter topology with a high voltage conversion ratio for renewable system applications. The desired high voltage gain and satisfactory performance can be achieved by employing only a single power switch with simple control technique. The proposed converter can be used to step up the low voltage generated from renewable energy sources, such as solar photovoltaic modules, to the high level of the dc bus voltage, obtaining low-to-high voltage conversion ratios of approximately 30 times without adopting extremely large duty cycle. Employing the proposed c

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Wah Lai, Hau, Cho Man Tsui, and Hing Wah Li. "Computer Aided Verification of Voltage Dips and Short Interruption Generators for Electromagnetic Compatibility Immunity Test in Accordance with IEC 61000-4-11: 2004 + AMD: 2017." NCSL International measure 13, no. 1 (2021): 28–39. http://dx.doi.org/10.51843/measure.13.1.3.

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This paper describes a procedure and a computer-aided system developed by the Standards and Calibration Laboratory (SCL) for verification of voltage dip and short interruption generators in accordance with the international standard IEC 61000-4-11:2004+AMD1:2017. The verification is done by calibrating the specified parameters and comparing with the requirements stated in the standard. The parameters that should be calibrated are the ratios of the residual voltages to the rated voltage, the accuracy of the phase angle at switching, and the rise time, fall time, overshoot and undershoot of the

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Ismagilov, Flyur, Ilgiz Yangirov, Ruzil Safiullin, Aygul Ayupova, and Gulnara Safina. "HIGH-VOLTAGE PULSE GENERATOR BASED ON DUAL-SPIRAL MAGNETIC ACCUMULATION GENERATOR WITH IMPROVED CHARACTERISTICS." Electrical and data processing facilities and systems 18, no. 3-4 (2022): 23–34. http://dx.doi.org/10.17122/1999-5458-2022-18-3-4-23-34.

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Relevance The paper proposes an original design of a high-voltage electromechanical two-spiral voltage source based on a magnetic accumulation generator (MAG) and a voltage multiplier with improved characteristics. In the multiplier, with the help of special switches, the addition of all voltages arising from the electrical explosion of conductors in separate inductive energy storage devices connected in parallel to the magnetic accumulation generator is carried out. A mathematical model and the results of mathematical modeling of the operation of the voltage source are presented, the calculat

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Diong, Bill, Hossein Sepahvand, and Keith A. Corzine. "Harmonic Distortion Optimization of Cascaded H-Bridge Inverters Considering Device Voltage Drops and Noninteger DC Voltage Ratios." IEEE Transactions on Industrial Electronics 60, no. 8 (2013): 3106–14. http://dx.doi.org/10.1109/tie.2012.2202351.

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Shahzad, Shazrah, Dawar Ali, Jawad Asif, et al. "Effect of Ethane-1,2-Diamine on Growth of ZnO Nanorods and Cyclohexane Sensing by Current-Voltage Characteristics Investigations." Key Engineering Materials 778 (September 2018): 126–31. http://dx.doi.org/10.4028/www.scientific.net/kem.778.126.

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The growth of vertically aligned ZnO Nanorods arrays using Zinc Nitrate hexahydrate and Hexamethylene Tetramine (HMTA), by Chemical Bath Deposition on Silicon Wafer was investigated. The growth is conducted under influence of Ethane-1,2-diamine, the amine based enhancer was evaluated based on three different ratios (1:0.5, 1:1, 1:1.5) of enhancer to the precursor (Zinc Nitrate and HMTA). The effect different ratios of enhancers on morphology aspect ratio and crystallinity of the as grown Nanorods were studied under Scanning electron microscope (SEM) and X-ray powder diffraction (XRD). Electric

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Wang, Yao, Haibo Wang, and Guangjun Wen. "Design Techniques for Ultra-Low Voltage Comparator Circuits." Journal of Circuits, Systems and Computers 24, no. 01 (2014): 1550013. http://dx.doi.org/10.1142/s0218126615500139.

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This paper presents a novel low-voltage rail-to-rail comparator circuit and derives optimal transistor size ratios for both conventional latch-based and the proposed comparators which operate in transistor subthreshold region. The obtained analytical results serve well as guidelines for designing low-voltage comparators and the proposed circuit is significantly faster than existing rail-to-rail comparator designs in ultra-low voltage operation.

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Martusenko, V. E., Yu Yu Dedeshko, and D. Е. Minaev. "The effect of the accuracy of determining the angular ratios of the vectors of a three-phase system on the error of estimating symmetric components." Вестник Северо-Кавказского федерального университета, no. 6 (99) (2023): 16–24. http://dx.doi.org/10.37493/2307-907x.2023.6.2.

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Introduction. Analysis of the quality of electricity based on indicators characterizing voltage asymmetry using the classical method of symmetrical components involves measuring not only an assessment of the voltage modules of a three-phase system, but also their angular ratios. Goal. Assessment of the influence of the angular error of vector measurements of the parameters of a three-phase system on the accuracy of estimating symmetrical components. Materials and methods. As part of the research, a statistical testing method was implemented based on a computational experiment. Results and disc

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Hao, Luwen, Xin Chen, Yuchen Jiang, et al. "Optimizing CT Esophagography: Ex Vivo Study on Contrast Ratios, Image Quality, and Dual-Energy Benefits." Bioengineering 11, no. 12 (2024): 1300. https://doi.org/10.3390/bioengineering11121300.

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This study aimed to optimize CT esophagography by identifying effective oral contrast dilution ratios and exploring the advantages of dual-energy CT (DECT) over conventional CT for improving image quality. Ex vivo experiments using iodine contrast agents (320–400 mgI/mL) at 21 dilution ratios were scanned at three voltages, with additional dual-energy scans generating various reconstruction images. Image quality was assessed both objectively and subjectively. The study found significant variability in image quality across different dilution ratios. Specific dilution ratios that produced image

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Bartsch, Wolfgang, Heinz Mitlehner, and S. Gediga. "Bipolar SiC-Diodes – Challenges Arising from Physical and Technological Aspects." Materials Science Forum 556-557 (September 2007): 889–94. http://dx.doi.org/10.4028/www.scientific.net/msf.556-557.889.

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In this contribution we summarize measurements on bipolar high voltage SiC-diodes which were fabricated on 4H-SiC wafers preferentially cut 4° off the [0001] basal plane, whereas the p-emitter thickness was varied in predetermined ratios to the n-base thickness. The switching behaviour of optimized 6.5 kV-Diodes at a current level of 25 A is shown at DC link voltages up to 4 kV and at a junction temperature of 125°C. Experimental results are discussed in terms of snappiness.

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Azimi, Mohammad, Mehdi Habibi, and Paolo Crovetti. "A Two-Stage Sub-Threshold Voltage Reference Generator Using Body Bias Curvature Compensation for Improved Temperature Coefficient." Electronics 13, no. 7 (2024): 1390. http://dx.doi.org/10.3390/electronics13071390.

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Leakage diodes cause deviations in the thermal drift of ultra-low-power two-transistor (2T) reference circuits, resulting in either convex or concave output voltages against temperature, depending on the reference transistor types (n-type/p-type). This paper investigates the combined application of the convexity and concavity properties exhibited by the output voltage of complementary 2T references, one n-type and one p-type. By exploiting the body bias effect, this approach mitigates variations in the output reference voltage caused by temperature fluctuations. Software optimization is also u

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40

Mumtaz, Farhan, Nor Zaihar Yahaya, Sheikh Tanzim Meraj, Narinderjit Singh Sawaran Singh, and Ghulam E. Mustafa Abro. "A Novel Non-Isolated High-Gain Non-Inverting Interleaved DC–DC Converter." Micromachines 14, no. 3 (2023): 585. http://dx.doi.org/10.3390/mi14030585.

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High-gain DC–DC converters are being drastically utilized in renewable energy generation systems, such as photovoltaic (PV) and fuel cells (FC). Renewable energy sources (RES) persist with low-level output voltage; therefore, high-gain DC–DC converters are essentially integrated with RES for satisfactory performance. This paper proposes a non-isolated high-gain non-inverting interleaved DC–DC boost converter. The proposed DC–DC converter topology is comprised of two inductors and these are charging and discharging in series and parallel circuit configurations. The voltage multiplier technique

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N, Kanagaraj, Morteza Mollajafari, Farzam Mohammadiazar, Ehsan Akbari, Ebrahim Sheykhi, and Hicham Chaoui. "A New Voltage-Multiplier-Based Power Converter Configuration Suitable for Renewable Energy Sources and Sustainability Applications." Sustainability 14, no. 24 (2022): 16698. http://dx.doi.org/10.3390/su142416698.

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The sustainability of new-generation energy sources has become one of the most critical challenges in recent years as renewable energy sources (RESs) rapidly replace old fossil sources. Integration between RESs and the grid should be completed through power electronics converters and optimized control techniques. RESs have many advantages, such as having increased reliability and sustainability, being environmentally friendly, and having cheaper maintenance costs and more reasonable energy prices. Photovoltaic (PV) panels are among the most popular RESs. A PV array’s generated voltage level is

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Wang, Ya, Hai Wang, and Wei Wan. "The Incorporation of Carbon Element into Nanoporous Anodic Alumina by Pulse Anodization." Journal of Nanoscience and Nanotechnology 19, no. 6 (2019): 3621–26. http://dx.doi.org/10.1166/jnn.2019.16126.

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The incorporation of carbon element into nanoporous anodic aluminum oxides from oxalic acid electrolyte was studied. The carbon element content in nanoporous anodic alumina by pulse anodization reaches up to ∼20 at.%, while it remains ∼7 at.% under constant anodization. It was proposed that the ionic dynamics in nanopores governs the carbon-containing anions incorporation into nanoporous anodic oxides. For the same 20 V resting voltage, the content of carbon element remains unchanged in a broad range of working voltages: 40–150 V. X-ray photoelectron analysis further revealed that the sp2/sp3

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Sirisha, Bogimi, and Saieni Akhilesh. "High efficient and high gain boost converter with soft switching capability connected to grid using dq axis current control." Bulletin of Electrical Engineering and Informatics 11, no. 2 (2022): 624–35. http://dx.doi.org/10.11591/eei.v11i2.3358.

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Renewable sources like solar PV arrays are generally operated at low voltages due to safety issues. For applications such as grid connected systems, it requires boosting to high voltage which leads to reduction in efficiency. To solve this, a new high gain and efficient boost converter which is a combination of buffer capacitor, passive clamp recovery circuit to restore leakage energy in coupled inductor is presented. The magnetic field of the linked inductor stores the energy obtained from the supply. A passive clamp network recovers the energy that is stored in the leakage inductance, enhanc

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Bogimi, Sirisha, and Akhilesh Saieni. "High efficient and high gain boost converter with soft switching capability connected to grid using dq axis current control." Bulletin of Electrical Engineering and Informatics 11, no. 2 (2022): 624–35. https://doi.org/10.11591/eei.v11i2.3358.

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Abstract:

Renewable sources like solar PV arrays are generally operated at low voltages due to safety issues. For applications such as grid connected systems, it requires boosting to high voltage which leads to reduction in efficiency. To solve this, a new high gain and efficient boost converter which is a combination of buffer capacitor, passive clamp recovery circuit to restore leakage energy in coupled inductor is presented. The magnetic field of the linked inductor stores the energy obtained from the supply. A passive clamp network recovers the energy that is stored in the leakage inductance, enhanc

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Lin, Fei Peng, Huang Hui Zhang, Hai Ming Shao, Yan Qiang Li, and Wen Feng Li. "High Voltage Ratio Measurement Base on Two-Digital-Meters External Synchronous Trigger Mode." Advanced Materials Research 718-720 (July 2013): 815–19. http://dx.doi.org/10.4028/www.scientific.net/amr.718-720.815.

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This paper researches DC high voltage ratios measurement method, which based on two-digital meters with external synchronous trigger mode. Through experiment, the measurement method can overcome the effect of high voltage power supply ripple and drift. The type A uncertainty of this method could decrease more than 10-100 times.

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Li, Jie, Laurent Souriau, Shreya Kundu, Philippe Bezard, and Frederic Lazzarino. "Plasma Etch of IGZO Thin Film and IGZO/SiO₂ Interface Diffusion in Inductively Coupled CH₄/Ar Plasmas." ECS Meeting Abstracts MA2024-02, no. 20 (2024): 1788. https://doi.org/10.1149/ma2024-02201788mtgabs.

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InGaZnO (IGZO) has recently gained considerable attention as a promising alternative channel material for semiconductor devices. Thoroughly investigating and precisely controlling the manufacturing processes, including plasma etching of IGZO material, become essential for the fabrication of IGZO-channel devices. In this work the etching characteristics of IGZO thin films were systemically investigated in inductively coupled CH4/Ar plasmas with various gas ratios, bias voltages, and surface temperatures. The ion flux in CH4/Ar plasmas were analyzed using bias power and voltage, and the relative

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Luo, Bing, Jian Wang, Dong Dai, Lei Jia, Licheng Li, and Tingting Wang. "Partial Discharge Simulation of Air Gap Defects in Oil-Paper Insulation Paperboard of Converter Transformer under Different Ratios of AC–DC Combined Voltage." Energies 14, no. 21 (2021): 6995. http://dx.doi.org/10.3390/en14216995.

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A converter transformer is important primary equipment in a DC transmission project. The voltage on the valve side winding is complex when the equipment is running, including DC, AC, and AC–DC combined voltage. The insulation structure of the valve side winding of a converter transformer is an oil-paper insulation structure, which may have a variety of defects in the manufacturing stage and daily use, resulting in partial discharge. Therefore, it is the key to studying the partial discharge characteristics and mechanism of oil-paper insulation under AC–DC combined voltage. In this paper, we bu

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Gu, Pei-Yang, Junkuo Gao, Cai-Jian Lu, et al. "Synthesis of tetranitro-oxacalix[4]arene with oligoheteroacene groups and its nonvolatile ternary memory performance." Mater. Horiz. 1, no. 4 (2014): 446–51. http://dx.doi.org/10.1039/c4mh00022f.

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Premalatha, R., and P. Murugesan. "Comparison of Filter with Fuzzy Controlled Three Level DC-DC Converter Fed Drive." International Journal of Engineering Research in Africa 14 (March 2015): 63–74. http://dx.doi.org/10.4028/www.scientific.net/jera.14.63.

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A simple Fuzzy logic controller (FLC) applied to buck converter is presented in this paper. This approach uses FLC which performs better when compared with the conventional PI controllers. In proposed buck converters, high voltage dc supply is switched at very high frequency and inductively transferred to dc load via a high frequency transformer and rectifier. In this converter four power switches are connected in series to primary of high frequency transformer for large load currents. To achieve large step-down voltage ratios the power switches are turned ON and OFF alternatively with a time

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Wan, Hsiao-Hsuan, Jian-Sian Li, Chao-Ching Chiang та ін. "(Invited) NiO/ β-(Al _x Ga_1-x)₂O₃ /Ga₂O₃ Heterojunction Lateral Rectifiers with Reverse Breakdown Voltage > 7kV". ECS Transactions 111, № 2 (2023): 85–96. http://dx.doi.org/10.1149/11102.0085ecst.

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NiO/ β-(Al x Ga1-x )2O3 /Ga2O3 heterojunction lateral geometry rectifiers with diameter 50-100 µm exhibited maximum reverse breakdown voltages >7kV, showing the advantage of increasing the bandgap using the β-(Al x Ga1-x )2O3 alloy. This Si-doped alloy layer was grown by Metal Organic Chemical Vapor Deposition with an Al composition of ~21 %. On state resistances were in the range 50-2180 Ω.cm2, leading to power figures-of-merit up to 0.72 MW.cm-2. The forward turn-on voltage was in the range 2.3-2.5 V, with maximum on/off ratios >700 when switching from 5V forward to reverse biases up t

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