Artigos de revistas: "Frequency converter"

1

KUNOMURA, Ken, e Naotaka IIO. "Electronic Frequency Converter". Journal of The Institute of Electrical Engineers of Japan 130, n.º 8 (2010): 530–31. http://dx.doi.org/10.1541/ieejjournal.130.530.

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Tergemes, K. T., A. R. Karassayeva, A. Zh Sagyndikova, Zh K. Orzhanova e Е. Shuvalova. "STABILITY OF ANONLINEAR SYSTEM «FREQUENCY CONVERTER-ASYNCHRONOUS MOTOR»". Series of Geology and Technical Sciences 447, n.º 3 (15 de junho de 2021): 124–28. http://dx.doi.org/10.32014/2021.2518-170x.73.

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In modern industry, various industries are widely used frequency converters (FС) to control the speed of rotation of asynchronous motors. Widely used frequency converters that feed asynchronous motors allow you to optimize production, reduce electrical energy consumption, increase the service life of equipment, etc. The article considers the system "frequency converter-asynchronous motor" as a complex nonlinear automatic control system. On the basis of the linearized transfer function of the frequency converter and the asynchronous motor, the block diagram of the open system "frequency converter - asynchronous motor"is made. The mathematical description of the system is written by algebraic controls in symbolic form. A program for generating the transfer function and calculating the roots of the characteristic equation using the MATLAB application package is presented. To determine the stability of the frequency converter - asynchronous motor system, a program is compiled where the stability of the system is determined by the characteristic roots of the equation. The transient curve of the speed and torque of an asynchronous motor confirms the adequacy of the block diagram "frequency converter-asynchronous motor" and its mathematical description.

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3

Yang, Tongbin, Xiaotong Guan, Wenjie Fu, Dun Lu, Xuesong Yuan e Yang Yan. "Investigation on 220 GHz Taper Cascaded Over-Mode Circular Waveguide TE0n Mode Converter". Electronics 10, n.º 2 (6 de janeiro de 2021): 103. http://dx.doi.org/10.3390/electronics10020103.

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This paper proposes a taper cascaded over-mode circular waveguide TE0n mode converter for the millimeter and terahertz wave gyrotron. The mode converter of this structure can effectively reduce the difficulty of high frequency mode converter in fabrication. This paper verifies the feasibility of this new structure from theory, simulation, and experiment. Based on coupled wave theory calculations, three TE02-TE01 mode converters with lengths of 65.43 mm (4 segments), 119.3 mm (6 segments) and 136 mm (8 segments) and a TE03-TE02 mode converter with a length of 92 mm (8 segments) are optimized. The conversion efficiency in the frequency band 215–225 GHz is 91.8–94%, 93–95%, 95–98.78% and 95–98.44%. Because the length of the mode converter is clearly limited, this paper selects the TE02-TE01 mode converter with a length of 65.43 mm (4 segments) and the TE03-TE02 mode converter with 92 mm (8 segments) for simulation and experimental verification. In the simulation software Computer simulation technology (CST), the TE02-TE01 and TE03-TE02 mode converters and their composed TE03-TE01 mode converters are selected for modeling and analyzing. The simulation results and theoretical calculation results of the three mode converters only have different degrees of frequency deviation, and the frequency deviation of the 4-stage TE02-TE01 mode converter can be ignored; the frequency deviations of TE03-TE02 mode converter and TE03-TE01 mode converter are 2 GHz and 3 GHz, respectively. The experimental system is a field scanning system based on a vector network analyzer (VNA), which scans the input and output of the mode converter respectively. The experimental result is that when the input mode purity is 92% in TE01 mode, the output mode TE03 mode has a mode purity of 82%, and it has lower transmission loss. In this paper, the results from theory, simulation and experiment are in good agreement. This type of mode converter is easy to prepare, which makes it an effective alternative for high frequency curvilinear waveguide mode converter.

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Zhang, Rui, Wei Ma, Lei Wang, Min Hu, Longhan Cao, Hongjun Zhou e Yihui Zhang. "Line Frequency Instability of One-Cycle-Controlled Boost Power Factor Correction Converter". Electronics 7, n.º 9 (17 de setembro de 2018): 203. http://dx.doi.org/10.3390/electronics7090203.

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Power Factor Correction (PFC) converters are widely used in engineering. A classical PFC control circuit employs two complicated feedback control loops and a multiplier, while the One-Cycle-Controlled (OCC) PFC converter has a simple control circuit. In OCC PFC converters, the voltage loop is implemented with a PID control and the multiplier is not needed. Although linear theory is used in designing the OCC PFC converter control circuit, it cannot be used in predicting non-linear phenomena in the converter. In this paper, a non-linear model of the OCC PFC Boost converter is proposed based on the double averaging method. The line frequency instability of the converter is predicted by studying the DC component, the first harmonic component and the second harmonic component of the main circuit and the control circuit. The effect of the input voltage and the output capacitance on the stability of the converter is studied. The correctness of the proposed model is verified with numerical simulations and experimental measurements.

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Baciu, I., e C. D. Cunţan. "Single-phase frequency converter". IOP Conference Series: Materials Science and Engineering 163 (janeiro de 2017): 012036. http://dx.doi.org/10.1088/1757-899x/163/1/012036.

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Xiong Du, Luowei Zhou e Heng-Ming Tai. "Double-Frequency Buck Converter". IEEE Transactions on Industrial Electronics 56, n.º 5 (maio de 2009): 1690–98. http://dx.doi.org/10.1109/tie.2009.2013752.

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Mikheeva, M. P., V. M. Vinogradov, S. M. Slinkin, V. S. Ovechko, N. I. Likholit e R. A. Petrenko. "Nonlinear optical frequency converter". Journal of Applied Spectroscopy 56, n.º 5-6 (maio de 1992): 530–31. http://dx.doi.org/10.1007/bf00661762.

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Ragimov, M. I., e V. M. Babaev. "Frequency-to-voltage converter". Measurement Techniques 28, n.º 1 (janeiro de 1985): 96–97. http://dx.doi.org/10.1007/bf00861115.

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Ismail, Adla, Lotfi Saidi e Mounir Sayadi. "Wind turbine power converter fault diagnosis using DC-link voltage time–frequency analysis". Wind Engineering 43, n.º 4 (23 de julho de 2019): 329–43. http://dx.doi.org/10.1177/0309524x19858252.

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With the developments in power electronic devices, there is increasing use of the insulated gate bipolar transistor devices in power converters. Power converters are more and more gaining attention in the wind energy conversion system. In this article, a grid-connected wind energy conversion system is considered. Wind energy conversion system optimal operation requires a diagnostic method for back-to-back power converter to be addressed in detail in this article. Therefore, an open-circuit switching fault diagnosis method for a back-to-back power converter is developed to improve the system reliability and optimize the produced power and also achieve its real operational cost. In this work, we investigate only the DC-Link voltage signal and we use the time–frequency analysis to achieve the diagnosis purpose. The scheduled diagnosis approach is divided into two tasks: the first one is the fault detection task and the second one is the fault localization task. The main novelty of the proposed diagnosis approach is to localize the appropriate faulty power converter, that is, rotor side power converter or grid side power converter. Also, this approach is able to localize faults when there is a simultaneous fault on both power converters. Simulations are carried out to verify the robustness of the proposed diagnosis approach. The achieved simulation results would help in diagnosing of Back-to-back power converter that would expectedly cancel the traditional diagnosis method.

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10

Shilin, A. N., M. N. Mustafa e N. S. Kuznetsova. "LOW-FREQUENCY ELECTROMECHANICAL VIBRATION CONVERTER BASED ON LEVITATION EFFECT". Kontrol'. Diagnostika, n.º 276 (junho de 2021): 52–57. http://dx.doi.org/10.14489/td.2021.06.pp.052-057.

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At present, one of the urgent problems in the energy and industry is to improve the reliability of the operation of various equipment. An effective method for increasing the reliability of equipment is diagnosing the state of machines and predicting their performance. Vibration control methods are widely used to diagnose rotary rotating machines. By the nature of the vibration process of the machine, it is possible to determine the degree of wear and, accordingly, the technical condition of the machines. In measuring technology for diagnostics of low-speed equipment with rotation frequencies of a unit of Hz, for example, hydroelectric generators of hydroelectric power plants, inertial electromechanical converters are used. The latest developments of such converters use an electromagnetic suspension with parametric feedback, which allows you to control the rigidity of the oscillatory system. However, for centering the moving part in electromechanical converters, flexible guides are used, which are sources of dry friction, which complicates the simulation of measurement processes and limits the sensitivity threshold to a minimum. In addition, flexible guides limit the frequency range of the converters. Currently, the most promising direction for solving this problem is the levitation effect, which allows you to completely exclude mechanical contact and, accordingly, reduce the sensitivity threshold of the transducer. From the analysis of literary sources, it follows that there are relatively few publications in this area. The proposed article provides an analysis of existing converters, on the basis of which a converter with improved characteristics, a measuring converter, is proposed. The proposed electromechanical converter has improved metrological characteristics and therefore can control and diagnose equipment in various fields of human activity. This problem is especially relevant in the hydropower industry.

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11

Zheng, Zhongqiang, Zhipeng Yao, Zongyu Chang, Tao Yao e Bo Liu. "A point absorber wave energy converter with nonlinear hardening spring power-take-off systems in regular waves". Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 234, n.º 4 (2 de maio de 2020): 820–29. http://dx.doi.org/10.1177/1475090220913687.

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Point absorber wave energy converter is one of the most effective wave energy harness devices. Most of the wave energy converters generate energy by oscillating the floating body. Usually, the power-take-off system is simplified as a linear spring and a linear damper. However, the narrow frequency bandwidth around a particular resonant frequency is not suitable for real vibrations applications. Thus, a nonlinear hardening spring and a linear damper are applied in the power-take-off system. The bandwidth of hardening mechanism is discussed. The dynamic model of wave energy converter is built in regular waves with time domain method. The results show that the nonlinear wave energy converter has higher conversion efficiency than the linear wave energy converter more than the natural frequency state. The conversion efficiency of the nonlinear wave energy converter in the low frequency state is closed to the linear converter. The amplitude of the incident wave, the damping of the nonlinear wave energy converter and the nonlinear parameter [Formula: see text] affect the energy capture performance of the wave energy converter.

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12

Padmavathi, Pydikalva, e Sudhakar Natarajan. "A Novel High Gain Voltage-Lift Technique Based Transformer free Non-isolated Quadratic Boost Converter". MATEC Web of Conferences 225 (2018): 04010. http://dx.doi.org/10.1051/matecconf/201822504010.

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A novel high gain voltage lift technique based transformer free non isolated boost converter is proposed with single switch operating at constant frequency in this paper. This performance of this converter is very good and high efficient compared to the conventional boost converters. The high gain is obtained by applying voltage lift cell to the quadratic boost converter. The simple structure, easy controlling and lower voltage stress. The operating principle with theoretical analysis and simulation results of proposed converter for various loads at 10 kHz frequency are discussed in this paper to compare the performance of this novel boost converter.

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13

Babu, A. R. Vijay, P. M. Venkatesh e Dr K. Suresh. "High Frequency Link Power Conversion System for Fuel cell Applications". International Journal of Engineering & Technology 7, n.º 4.24 (27 de novembro de 2018): 1. http://dx.doi.org/10.14419/ijet.v7i4.24.21760.

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In this paper an empirical model of the air breathing (ABFC) is proposed to investigate the cell voltage verses current density characteristics and harnessing of maximum energy from natural resource whenever it’s available. The power electronic converters role is important in between source and load. Proper controller can switch the converter in the desired time and improve the system performance and stability. The mathematical model of the ABFC is built in MATLAB/Simulink. The proposed system also has boost converter, bidirectional DC-DC converter and inverter for grid and energy integration. The boost inverter/buck rectifier in this system is controlled by ANFIS controller is for better output, boost and bidirectional DC-DC converters are controlled by PID controller in closed loop. Overall operations are based on modes main controller, which control the system operation in different modes. Any variations happening in the input, storage and load parameters, the controller changes the mode and operates the system in effective way.

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14

Geddam, Kiran Kumar, e Elangovan Devaraj. "Real Time Hardware-in-Loop Implementation of LLC Resonant Converter at Worst Operating Point Based on Time Domain Analysis". Energies 15, n.º 10 (16 de maio de 2022): 3634. http://dx.doi.org/10.3390/en15103634.

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The inductor inductor capacitor (LLC) resonant topology has become more popular for deployment in high power density and high-efficiency power converter applications due to its ability to maintain zero voltage switching (ZVS) over a wider input voltage range. Due to their ease of operation and acceptable accuracy, frequency domain-related analytical methods using fundamental harmonic approximation (FHA) have been frequently utilized for resonant converters. However, when the switching frequency is far from the resonant frequency, the circuit currents contain a large number of harmonics, which cannot be ignored. Therefore, the FHA is incapable of guiding the design when the LLC converter is used to operate in a wide input voltage range applications due to its inaccuracy. As a result, a precise LLC converter model is needed. Time domain analysis is a precise analytical approach for obtaining converter attributes, which supports in the optimal sizing of LLC converters. This work strives to give a precise and an approximation-free time domain analysis for the exact modeling of high-frequency resonant converters. A complete mathematical analysis for an LLC resonant converter operating in discontinuous conduction mode (DCM)—i.e., the boost mode of operation below resonance—is presented in this paper. The proposed technique can confirm that the converter operates in PO mode throughout its working range; in addition, for primary MOSFET switches, it guarantees the ZVS and zero current switching (ZCS) for the secondary rectifier. As a function of frequency, load, and other circuit parameters, closed-form solutions are developed for the converter’s tank root mean square (RMS) current, peak stress, tank capacitor voltage, voltage gain, and zero voltage switching angle. Finally, an 8 KW LLC resonant converter is built in the hardware-in-loop (HIL) testing method on RT-LAB OP-5700 to endorse the theoretical study.

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15

Sun, Bao Wen, e Yun Xi Wu. "Single-Stage Power Factor Correction (PFC) Converter Design". Applied Mechanics and Materials 687-691 (novembro de 2014): 3383–86. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.3383.

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A single-stage PFC converter was introduced in this paper, then the converter EMI filters, converters inductors, high-frequency transformers and power components were designed and chosen, proven to good effect.

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16

Zhang Zhengquan, 张政权, 刘庆想 Liu Qingxiang, 向欣 Xiang Xin, 张朋朋 Zhang Pengpeng e 吴志鹏 Wu Zhipeng. "High-frequency rectifying commutated converter". High Power Laser and Particle Beams 22, n.º 4 (2010): 721–24. http://dx.doi.org/10.3788/hplpb20102204.0721.

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17

Safonov, V. V. "Resistance to pulse frequency converter". Radioelectronics and Communications Systems 51, n.º 11 (novembro de 2008): 599–601. http://dx.doi.org/10.3103/s073527270811006x.

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18

NIEZNAŃSKI, JANUSZ. "Fast frequency to digital converter". International Journal of Electronics 66, n.º 1 (janeiro de 1989): 159–62. http://dx.doi.org/10.1080/00207218908925371.

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19

Chin, Y., e F. C. Y. Lee. "Constant-frequency parallel-resonant converter". IEEE Transactions on Industry Applications 25, n.º 1 (janeiro de 1989): 133–42. http://dx.doi.org/10.1109/28.18883.

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20

Loude, J. F. "Current-to-frequency isolation converter". Journal of Physics E: Scientific Instruments 18, n.º 10 (outubro de 1985): 824–26. http://dx.doi.org/10.1088/0022-3735/18/10/003.

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21

Vountesmeri, V. "Audio frequency magnetoresistive watt-converter". IEEE Transactions on Instrumentation and Measurement 51, n.º 1 (2002): 63–66. http://dx.doi.org/10.1109/19.989902.

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22

Ivanov, V. V., e M. V. Ivanov. "Instrumental resistance-frequency converter chip". Measurement Techniques 37, n.º 11 (novembro de 1994): 1292–96. http://dx.doi.org/10.1007/bf00993616.

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23

Izmailov, A. M. "Low-frequency-to-code converter". Measurement Techniques 35, n.º 7 (julho de 1992): 854–55. http://dx.doi.org/10.1007/bf00977226.

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24

Duranay, Zeynep Bala, e Hanifi Guldemir. "Simulation of boost AC-AC converter using single-phase matrix converter". International Journal of Applied Power Engineering (IJAPE) 10, n.º 4 (1 de dezembro de 2021): 307. http://dx.doi.org/10.11591/ijape.v10.i4.pp307-314.

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Generally, AC-AC converters are implemented using thyristors. These converters generate harmonics and have a low power factor. To eliminate these problems matrix converters (MC) are become used as AC-AC converter. Matrix converters have the capability of being used as frequency changer, rectifier, inverter and chopper. In this work, it is proposed to achieve the desired output of AC-AC Boost converter using single phase matrix converter (SPMC). The operation of single-phase AC-AC boost converter using MC is studied in this paper. The output voltage of this boost converter is higher than the AC input supply voltage. insulated gate bipolar transistors (IGBTs) are used as the switching elements in the SPMC power circuit. Sinusoidal Pulse width modulation (SPWM) technique is applied to generate switching signals to obtain the output voltage. The model of the matrix converter is constructed in MATLAB/Simulink programming software package. The behavior of SPMC is simulated with various switching frequencies. The simulation results together with harmonic spectrum and total harmonic distortion (THD) values are presented. Successful operation of boost SPMC is achieved.

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25

Kobori, Yasunori, Noriyuki Oiwa, Shogo Katayama, Ahmad Bustoni, Yi Fei Sun, Minh Tri Tran, Anna Kuwana e Haruo Kobayashi. "EMI Reduction of PFC Rectifier and LLC Converter with Automatic Output Ripple Improvement". Advanced Engineering Forum 38 (novembro de 2020): 103–17. http://dx.doi.org/10.4028/www.scientific.net/aef.38.103.

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This paper proposes the method of the Electro-Magnetic Interference (EMI) noise reduction of the AC-DC rectifiers and the DC-DC converters with the insulated transformers. For the Power Factor Correction (PFC) rectifier, the power factor is the most important item, but the EMI noise emitted from the clock pulse is not remarked. For the DC-DC converters such as the forward converter, the efficiency is the most important. We have focused on the EMI noise reduction for the PFC rectifier and insulated DC-DC converters with the frequency modulation of the clock pulses. First, the spectrum level of the clock pulse is introduced to be much reduced by shaking the clock frequency for the PFC rectifier and the forward converter. Next, we have investigated the EMI reduction of the LLC converter whose operating frequency varies to make the output voltage stable. It is difficult to modify the operating frequency to reduce the EMI noise. We have investigated to reduce the EMI noise by shaking the duty ratio of the resonant signals for the LLC converter. In this case, the output voltage ripple is increased by much EMI noise reduction. Finally, the technology to stabilize the increased ripple is introduced.

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Gao, Cheng Hai, Jian Ru Wan e Jiang Li. "The Quantitative Forecast and Suppression on the Electromagnetic Radiation from Low Voltage Frequency Converter". Applied Mechanics and Materials 575 (junho de 2014): 696–703. http://dx.doi.org/10.4028/www.scientific.net/amm.575.696.

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The main electromagnetic radiation source and the generating mechanism in low voltage frequency converter were defined and analyzed in this paper according to electromagnetic radiation theory together with the discussion of the impact on radiation from raise time, falling time of pulse width modulation (PWM) signal and carrier frequency, so that the radiation can be understood more exactly in term of numerical value change, which helps specifically reduction of converter radiation during design phase in compliance with related international standards and technical norms regarding industrial converter. Started with the theory of electromagnetic field the zone around converter were differentiated and analyzed based on the radiation characteristics. As main means of radiation suppression in converter shielding and grounding were quantitatively analyzed. A series of tests with different power rating converters verified the calculation and analysis. Consequently the design of converter was guided to meet the requirements of standard.

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Blagoveshchenskaya, Margarita M., e Mikhail V. Veselov. "Comparative study of frequency converters of three-phase electric motors in automatic control of technological parameter". Health, Food & Biotechnology 2, n.º 3 (15 de setembro de 2021): 48–56. http://dx.doi.org/10.36107/hfb.2020.i3.s71.

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Frequency converters of asynchronous three-phase AC motors are widely used in industry, including food production. A thorough understanding of the technical capabilities of frequency converters contributes to their efficient use. This article discusses a technical comparison of two frequency converters of three-phase electric motors of the Russian company "OWEN" and the Danish company "DANFOSS" according to the criterion of the quality of regulation of the technological parameter. For comparison, a test bench was created, in which the devices were tested in turn, under the same conditions. During the preparation and implementation of testing, it turned out that the hardware capabilities of frequency converters for their use in regulating technological parameters are the same, and the parametric capabilities are different. The frequency converter of the "OWEN" company is equipped with a PI controller, and the frequency converter from "DANFOSS" is equipped with a PID controller. As the results of testing the devices show, despite

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Cheng, Hung Liang, Chun An Cheng, Chao Shun Chen e Kuan Lung Huang. "Design and Implementation of a Dimmable LED Driver with Low-Frequency PWM Control". Applied Mechanics and Materials 284-287 (janeiro de 2013): 2538–42. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.2538.

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This paper proposes a high-efficiency dimmable LED driver for light emitting diodes (LED). The developed LED driver consists of a full-bridge resonant converter and six buck converters. The function of the full-bridge resonant converter is to obtain a smooth dc-link voltage for the buck converters by phase-shift modulation (PSM) while that of the six buck converters is to drive six LED modules, respectively. The gate voltage of the active switch of each buck converter is a combination of high-frequency and low-frequency pulses. The duty ratio of the high-frequency pulse controls the LED voltage and thereby, controls the amplitude of LED current. LEDs are dimmed by low-frequency pulse-width modulation (PWM) to vary the average current flowing through LED. Circuit equations are derived and circuit parameters are designed. High circuit efficiency is ensured by operating the active switches at zero-voltage switching-on to reduce the switching loss. Finally, a prototype circuit was built to verify the accuracy and feasibility of the proposed LED driver.

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Zheng, Hong, Yue Lei Shi e Hang Hui Zhang. "Continuous PWM Modulation Strategy for NPC/H and H Bridge Hybrid Multilevel Converter". Advanced Materials Research 748 (agosto de 2013): 510–13. http://dx.doi.org/10.4028/www.scientific.net/amr.748.510.

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f the ratio of NPC/H and H bridge hybrid multilevel converters DC supply voltage changed, the output voltage PWM waveform will be discontinuous. Thus an improved topology and control strategy is proposed. In new method, master converter operates at the fundamental frequency based on command voltage, slave converter adopts carrier phase shifted PWM technology (CPS-SPWM) at a higher frequency to enhance the quality of output voltage waveform. The amplitude of command voltage is higher than output voltage amplitude of the master converter at any time, to ensure that output voltage variation of both converters keeps in the same direction without any current flow backwards. Matlab simulation results demonstrate the effectiveness of the proposed control strategy and topology.

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Islam, Md Maidul, e Md Mamun Ur Rashi. "Development of a New High Frequency Two Quadrant DC-DC Sepic Converter". Asia Pacific Journal of Energy and Environment 5, n.º 1 (30 de junho de 2018): 31–40. http://dx.doi.org/10.18034/apjee.v5i1.248.

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The DC-DC converter find a wide scope in industries, telecommunication sectors, power electronics area, etc. Nowadays bi-directional converters have a higher end over them since the energy from the load during regenerative braking is fed back to the source, thus obtaining energy efficient system. A single topology that can provide Buck-Boost operation with positive output having four quadrant operations is not available in the literature. A common limitation of power coupling effect in some known multiple-input dc-dcconverters has been addressed in many kinds of literatures. In this paper, a new single topology of two quadrants DC-DC Sepic converter has been developed to provide four quadrant operation of a high- frequency dc-dc converter having one supply source and proper control of the converter. The combined topology has been analyzed and studied by spice simulation.

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Kobori, Yasunori, Jing Li, Yi Fei Sun, Minh Tri Tran, Anna Kuwana e Haruo Kobayashi. "Automatic Current Balance for Multi-Phase Switching Converters with Ripple Control or Soft Switch". Advanced Engineering Forum 38 (novembro de 2020): 143–56. http://dx.doi.org/10.4028/www.scientific.net/aef.38.143.

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This paper proposes a new multi-phase switching converter with atuotomatic current barance technique. It is well-known that the multi-phase switching converter is suitable to handle large output current with small output voltage ripple for the buck converters which use the clock pulse. This paper investigates a multi-phase controlled method for the ripple-controlled converters and the soft switching converters, that use no clock pulse; for this reason, these converters are difficult to realize multi-phase converter configurations. There are some multi-phase hysteretic controlled converters; they utilize a main clock generator or an external sub-clock pulse, which has the master-slave synchronization method. But it is difficult to respond to a frequency change of the master converter. These multi-phase converters have not considered the imbalance among phase currents caused by variations of inductors and semiconductor switches in the power stage. For the commercialized multi-phase Voltage Regulating Modules (VRMs), the inductors and the semiconductor switches are selected to adjust the balance among the phase currents. However, there is no multi-phase soft switching converter.Then we have developed the multi-phase ripple-controlled converter and the multi-phase soft switching converter with the technique of detecting 180-degree from the variable operating frequency of the main converter. Moreover, in these converters, there appears the current imbalance because of the element variations among inductors and capacitors, if some cares are not taken there. Then we have developed the automatic correction for the current imbalance by modifying the width of the Constant On Time (COT) pulse or modifying the slope of the saw-tooth signal.

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Li, Wei Jie, Dong Yi Meng, Yu Jie Chang, Chun Yang, Yi Lv e Li Jun Diao. "Research on Performance Contrast between SiC MOSFET and Si IGBT Based on the Converter of Urban Rail Vehicles". Materials Science Forum 954 (maio de 2019): 188–93. http://dx.doi.org/10.4028/www.scientific.net/msf.954.188.

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Power electronic devices are the basis of power converters, and excellent device performance improves that of power converters directly. In this paper we take SiC MOSFET CAS120M12BM2 (1200V/ 120A) and Si IGBT FF150R12KE3G (1200V/150A) as examples, which have the same voltage rating, to apply to the converters of urban rail vehicles, whose switching frequency, power density and efficiency are analyzed and contrasted. The results show that the switching frequency of the SiC MOSFET converter can be increased to 50kHz, at the same time its power density and efficiency are significantly higher than that of the Si IGBT converter.

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Sherniyozov, A. A., Sh D. Payziyev, G. A. Khalikov, Kh F. Zikrillayev, S. A. Bakhramov, Kh M. Makhmudov, M. Z. Ismailov e D. E. Payziyeva. "Effect of color converters on the performance of solar or light-emitting diode pumped solid-state lasers". «Узбекский физический журнал» 22, n.º 5 (28 de novembro de 2020): 287–90. http://dx.doi.org/10.52304/.v22i5.193.

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The effect of using external frequency converters on the luminescence intensity of an Nd:YAG crystal is studied. The crystal is illuminated by light-emitting diode (LED) with and without Y3Al5O12:Ce3+ material as an external converter. Obtained experimental results show that the luminescence intensity of Nd:YAG crystal increased by 1.5 times when Nd:YAG crystal is illuminated by LED together with color converter based on Y3Al5O12:Ce3+ demonstrating that external frequency converters can be a potential candidate for creating more efficient solar or LED pumped lasers.

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Bright, S. J. V., S. Ramkumar e H. Anand. "Positive output elementary Luo converter for fixed-frequency ZVS operation". Bulletin of the Polish Academy of Sciences Technical Sciences 65, n.º 2 (1 de abril de 2017): 255–62. http://dx.doi.org/10.1515/bpasts-2017-0029.

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Abstract Luo converter is one amid the developed DC-DC converters offering higher voltage gain. Soft-switching techniques, like zero-voltage switching (ZVS), repress switching losses, and hence the system efficiency and the life of the power semiconductor switches are improved. Incorporation of soft switching in fixed-frequency operation of the Luo converters may persuade them in the regulated power supply applications. The existing variable switching frequency solution suffers from a number of problems viz. complexity in filter designing, more electromagnetic interference (EMI), etc. This paper proposes a positive output elementary Luo converter (POELC) involving ZVS with the wherewithal of working in fixed frequency. A comprehensive discussion on the proposed circuit topology is detailed with both simulation and experimental studies. Systematic descriptions of basic POELC, variable-frequency ZVS-POELC, and fixed-frequency ZVS-POELC make an impact on the understanding of related concepts by the researchers in this field.

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Quester, Matthias, Fisnik Loku, Otmane El Azzati, Leonel Noris, Yongtao Yang e Albert Moser. "Investigating the Converter-Driven Stability of an Offshore HVDC System". Energies 14, n.º 8 (20 de abril de 2021): 2341. http://dx.doi.org/10.3390/en14082341.

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Offshore wind farms are increasingly built in the North Sea and the number of HVDC systems transmitting the wind power to shore increases as well. To connect offshore wind farms to adjacent AC transmission systems, onshore and offshore modular multilevel converters transform the transmitted power from AC to DC and vice versa. Additionally, modern wind farms mainly use wind turbines connected to the offshore point of common coupling via voltage source converters. However, converters and their control systems can cause unwanted interactions, referred to as converter-driven stability problems. The resulting instabilities can be predicted by applying an impedance-based analysis in the frequency domain. Considering that the converter models and system data are often confidential and cannot be exchanged in real systems, this paper proposes an enhanced impedance measurement method suitable for black-box applications to investigate the interactions. A frequency response analysis identifies coupling currents depending on the control system. The currents are subsequently added to the impedance models to achieve higher accuracy. The proposed method is applied to assess an offshore HVDC system’s converter-driven stability, using impedance measurements of laboratory converters and a wind turbine converter controller replica. The results show that the onshore modular multilevel converter interacts with AC grids of moderate short-circuit ratios. However, no interactions are identified between the offshore converter and the connected wind farm.

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36

Ahi, Kiarash. "Modeling and Control of a Multiphase Modular High-Frequency Converter/Inverter for Vehicle Applications". International Journal of High Speed Electronics and Systems 27, n.º 03n04 (setembro de 2018): 1840014. http://dx.doi.org/10.1142/s0129156418400141.

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This paper presents a novel control algorithm for a modular high-frequency converter. This control algorithm is designed to achieve an effective frequency higher than the switching frequency on the passive elements. As a result, the ripple on the output is suppressed, and smaller capacitors can be used. In this work, the modular high-frequency converter is modeled by equivalent boost converters. Based on the equivalent models a control algorithm is developed. The accuracy of the algorithm has been verified by simulation results using PLECS in the MATLAB/Simulink environment.

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Kroics, Kaspars. "Digital Control of Variable Frequency Interleaved DC-DC Converter". Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 2 (8 de agosto de 2015): 124. http://dx.doi.org/10.17770/etr2013vol2.854.

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This paper represents a design and implementation of a digital control of variable frequency interleaved DC-DC converter using a digital signal processor (DSP). The digital PWM generation, current and voltage sensing, user interface and the new period and pulse width value calculation with DSP STM32F407VGT6 are considered. Typically, the multiphase interleaved DC - DC converters require a current control loop in each phase to avoid imbalanced current between phases. This increases system costs and control complexity. In this paper the converter which operates in discontinuous conduction mode is designed in order to reduce costs and remove the current control loop in each phase. High current ripples associated with this mode operation are then alleviated by interleaving. Pulse width modulation (PWM) is one of the most conventional modulation techniques for switching DC - DC converters. It compares the error signal with the sawtooth wave to generate the control pulse. This paper shows how six PWM signals phase-shifted by 60 degrees can be generated from calculated values. To ensure that the measured values do not contain disturbances and in order to improve the system stability the digital signal is filtered. The analog to digital converter's (ADC) sampling time must not coincide with the power transistor's switching time, therefore the sampling time must be calculated correctly as well. Digital control of the DC-DC converter makes it easy and quickly to configure. It is possible for this device to communicate with other devices in a simple way, to realize data input by using buttons and keyboard, and to display information on LED, LCD displays, etc.

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Kobori, Yasunori, Yi Fei Sun, Minh Tri Tran, Anna Kuwana e Haruo Kobayashi. "Pulse Coding Controlled Switching Converters with Notch Frequency Generation in Noise Spectrum". Advanced Engineering Forum 38 (novembro de 2020): 118–29. http://dx.doi.org/10.4028/www.scientific.net/aef.38.118.

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This paper proposes a new technology about generating notch characteristics in noise spectrum of DC-DC switching converters for the communication devices. There are very few reports about the pulse coding controlled switching converter, though it is sometimes used in digital-to-analog converter (DAC) field, to our knowledge. We have investigated the pulse coding technology to switching converters to generate automatically the notch characteristics in the noise spectrum. The notch frequency Fn in the spectrum of the switching pulses is created by two coding pulses to control the main power switch. The clock and coding pulses are automatically generated from the input frequency Fin to create the notch frequency Fn=Fin. In addition, the notch frequency is experimentally confirmed with the prototype circuit.

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Matalata, Hendi, e Leily W. Johar. "ANALISA BUCK CONVERTER DAN BOOST CONVERTER PADA PERUBAHAN DUTY CYCLE PWM DENGAN MEMBANDINGKAN FREKUENSI PWM 1,7 Khz DAN 3,3 Khz". Jurnal Ilmiah Universitas Batanghari Jambi 18, n.º 1 (14 de fevereiro de 2018): 42. http://dx.doi.org/10.33087/jiubj.v18i1.431.

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Buck-Boost Converters are electric power supply device for raising and lowering the voltage DC (Direct Current) power supply equipment according to needs of the electrical load, this research is designed to Buck-Boost Converter and Converter on the 12 Volt power supply, the design of a Buck Converter power supply derived 5 Volt, 6Volt and 6 Volt design while the Boost Converter power supply 12 Volt offered up to 16 Volt, 19 Volt and 22 Volts in a way set the duty cycle of PWM frequency settings in 1.7 Khz and 3.3 Khz. Results research indicates the State of the differences in each frequency in the set output voltage ripple shape obtained is different, however, in the design of this research have been successfully carried out as expected.Keywords: buck converter, boost converter, change in duty cycle

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40

Hayashi, Yusuke, Yoshikatsu Matsugaki e Tamotsu Ninomiya. "Design Consideration for High Step-Up Nonisolated Multicellular dc-dc Converter for PV Micro Converters". Journal of Engineering 2018 (2018): 1–16. http://dx.doi.org/10.1155/2018/5098083.

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High step-up nonisolated multicellular dc-dc converter has been newly proposed for PV microconverters. The multicellular converter consists of the nonisolated step-up cell converters using bidirectional semiconductor switches, and these cell converters are connected in Input Parallel Output Series (IPOS). The voltage transformation ratio of the step-up converter is N/(1-D) in case all the transistors in N cell converters are operated at the duty ratio of D. The proposed multicellular dc-dc converter also accomplishes high efficiency because of no magnetic coupling such as the high frequency transformer and the coupled inductor. Laboratory prototype has been fabricated to show the feasibility of the proposed converter. Design consideration for the 20 V–40 V to 384 V, 240 W nonisolated multicellular dc-dc converter has been also conducted, and the potential to achieve the efficiency of 98% has been shown. The proposed multicellular converter contributes to realizing the environmentally aware data centers for future low carbon society.

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Biliński, Janusz. "The latest generation drive for electric buses powered by SiC technology for high energy efficiency". MATEC Web of Conferences 180 (2018): 02012. http://dx.doi.org/10.1051/matecconf/201818002012.

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High energy efficiency and increasing the working frequency of the converter will make it possible to minimize the size of the cooling system and reduce energy consumption. The use of the SiC technology in propulsion drives increases the efficiency of the converter by 1÷1.5%. Simultaneously, higher working frequency reduces losses in the traction motor, significantly lowering the cost of the energy consumed by the vehicle. Auxiliary converters using the SiC technology are a new quality. The reduction of weight and size is very significant (ca. 40÷50%). Higher switching frequency reduces the size of magnetic components (ca. 80%), and higher converter efficiency minimizes the size of the cooling system. The overall efficiency of the converter is extremely high (94÷96%). This paper presents comparison of Si and SiC parameters which are important for modern EV solutions. Paper presents also parameters of SiC traction inverter and auxiliary converter, designed and manufactured as state-of-the-art product for modern electric bus.

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Han, Bo Wen, Si Jia Li, Xiang Yu Cao e Jun Gao. "Design of Transmission Polarization Metasurface Converter". Materials Science Forum 1035 (22 de junho de 2021): 718–23. http://dx.doi.org/10.4028/www.scientific.net/msf.1035.718.

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The transmission polarization metasurface converter is an effective method to realize the polarization manipulation of the transmission waves, and it is also the research hotspot of metasurfaces. A new broadband transmissive polarization converter was proposed based on the metasurfaces converted incident linearly polarized waves into circularly polarized waves of transmission. The top and bottom layers of the unit were axisymmetric metal patches. The top and bottom layers of metal patches were overlapped and the shape was like an arrow. The thickness of the substrate was 4mm. The polarization conversion mechanism of metasurface was illustrated by parameter optimization and current analysis. The simulation results show that when the metasurface works in the frequency band of 6.71GHz~8.45GHz, the linearly polarized incident wave can be converted into a circularly polarized transmitted wave with axial ratio less than 3dB, and the relative bandwidth can reach 23%. The designed polarization converter has a simple structure and the potential application value in electromagnetic wave control of radio frequency devices.

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Vorontsov, A., V. Glushakov, M. Pronin e Yu Sychev. "Cascade frequency converters control features". Journal of Mining Institute 241 (25 de fevereiro de 2020): 37. http://dx.doi.org/10.31897/pmi.2020.1.37.

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The structures of systems with high-voltage cascade frequency converters containing multi-winding transformers and low-voltage low-power converters connected in series at each output phase of the load are considered. Low-voltage blocks contain three-phase diode or active rectifiers, DC capacitor filters, single-phase stand-alone voltage inverters and block disconnecting devices in partial modes (in case of failure when part of the blocks are disconnected). The possibilities of operation of cascade converters are determined, equations for correcting tasks to units in partial modes are given, tables of correction of tasks with estimates of achievable load characteristics are proposed. The results of experiments on the model of a powerful installation with a cascade frequency converter are presented, confirming the possibility of ensuring the symmetry of the load currents when disconnecting part of the blocks and the asymmetry of the circuit.

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Tran, Thanh Nhat Trung, Hung-Chia Wang e Jian-Min Wang. "A Dual-Mode Control Scheme to Improve Light Load Efficiency for Active-Clamp Flyback Converter". Electronics 11, n.º 9 (20 de abril de 2022): 1308. http://dx.doi.org/10.3390/electronics11091308.

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A novel dual-mode control scheme is proposed in this paper that permits the active-clamp flyback (ACF) converter to operate in both the quasi-resonant (QR) mode under light load and the active-clamp mode under medium or heavy load. The mode transition is performed based on the external dual-mode control circuit. In addition, the proposed converter incorporates a new QR mode valley switching (VS) control circuit that reduces switching loss in the main switch by achieving VS. Under medium to full load, the proposed converter becomes an ACF converter designed to achieve zero-voltage switching (ZVS), which reduces switching losses in both power switches. The proposed dual-mode control ACF converter has the following advantages: (1) compared with conventional ACF converters, the proposed ACF converters minimize switching losses by combining VS and ZVS; (2) under light load conditions, the frequency-limiting QR control mechanism is used to avoid disadvantageous switching losses caused by high switching frequencies. The 65 W ACF converter prototype with a DC 155 V input and a DC 19 V/3.42 A output under 65 kHz switching frequency was implemented. The experimental results demonstrate the feasibility of the proposed control scheme. The efficiency of the proposed converter reached 79% at a load of 3.5 W, which is 11% higher than the conventional ACF converter.

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Naifar, Slim, Sonia Bradai e Olfa Kanoun. "A magnetoelectric vibration converter with tunable resonance frequency / Magnetoelektrischer Vibrationswandler mit einstellbarer Resonanzfrequenz". tm - Technisches Messen 86, s1 (1 de setembro de 2019): 97–101. http://dx.doi.org/10.1515/teme-2019-0051.

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AbstractIntegration of smart materials to harvest energy from low vibration sources for powering wireless sensor networks has been of significant interest and still is. Owing to large magnetostriction and energy density of Terfenol- D, the use of piezoelectric/Terfenol-D composites exhibit great potential for the realization of vibration converters. In this work, a magnetoelectric vibration converter is dpresented. The interaction between the magnetic circuit and the magnetoelectric transducer is employed to tune the resonance frequency of the converter.

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Mortazavizadeh, Seyed Abolfazl, Simone Palazzo, Arturo Amendola, Enzo De Santis, Dario Di Ruzza, Giuseppe Panariello, Annunziata Sanseverino, Francesco Velardi e Giovanni Busatto. "High Frequency, High Efficiency, and High Power Density GaN-Based LLC Resonant Converter: State-of-the-Art and Perspectives". Applied Sciences 11, n.º 23 (30 de novembro de 2021): 11350. http://dx.doi.org/10.3390/app112311350.

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Soft switching for both primary and secondary side devices is available by using LLC converters. This resonant converter is an ideal candidate for today’s high frequency, high efficiency, and high power density applications like adapters, Uninterrupted Power Supplies (UPS), Solid State Transformers (SST), electric vehicle battery chargers, renewable energy systems, servers, and telecom systems. Using Gallium-Nitride (GaN)-based power switches in this converter merits more and more switching frequency, power density, and efficiency. Therefore, the present paper focused on GaN-based LLC resonant converters. The converter structure, operation regions, design steps, and drive system are described precisely. Then its losses are discussed, and the magnets and inductance characteristics are investigated. After that, various interleaved topologies, as a solution to improve power density and decrease current ripples, have been discussed. Also, some challenges and concerns related to GaN-based LLC converters have been reviewed. Commercially available power transistors based on various technologies, i.e., GaN HEMT, Silicon (Si) MOSFET, and Silicon Carbide (SiC) have been compared. Finally, the LLC resonant converter has been simulated by taking advantage of LTspice and GaN HEMT merits, as compared with Si MOSFETs.

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Cetin, Sevilay. "Accurate Prediction of Voltage Gain of the LLC Resonant Converter for EV battery Charge Applications". Academic Perspective Procedia 1, n.º 1 (9 de novembro de 2018): 544–57. http://dx.doi.org/10.33793/acperpro.01.01.105.

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This work presents detailed analysis of LLC resonant converter to accurately predcit the voltage gain of the converter. Nowadays, Lithium-ion battery cells are mostly preferred for on-board electrical vehicle (EV) battery chargers due to their high power density. This results in wide range output voltage regulation for battery charger. The output voltage regulation of LLC resonant converter is provided by the changing of switching frequency. However, conventional first harmonic approximation (FHA) method applying for resonant power converters produces error below resonance frequency. Therefore, the objective of this paper is accurate prediction of the voltage gain characteristic for LLC resonant converter using in EV battery charge applications. The detailed theoretical anlysis of the LLC resonant converter is presented and the presented analysis is compared with a simulation study with 2.7 kW output power and 250 V-450 V output voltage range.

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Paul, P. Jeno. "Shunt Active and Series Active Filters-Based Power Quality Conditioner for Matrix Converter". Advances in Power Electronics 2011 (11 de julho de 2011): 1–9. http://dx.doi.org/10.1155/2011/930196.

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This paper proposes a series active filter and shunt active filter to minimize the power quality impact present in matrix converters instead of passive filter. A matrix converter produces significant harmonics and nonstandard frequency components into load. The proposed system compensates the sag and swell problems efficiently in matrix converter. The proposed system has been tested and validated on the matrix converter using MATLAB/Simulink software. Simulated results confirm that the active power filters can maintain high performance for matrix converter.

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Jiang, Ting, Jian Feng Jiang e Xi Jun Yang. "Research on Multi-Stage Series-Connection High-Voltage High-Power Matrix Converter". Advanced Materials Research 347-353 (outubro de 2011): 843–47. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.843.

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Charge storage is an important research topic in smart grid and distributed generation system, pumped storage as one of the most popular large-scale charge storage methods has attracted increasing attention. However, the motor generator of the pumped charge station has high input voltage and heavy load, so in order to get grid connected safely, being soft started by a high voltage converter is necessary. In the view of the existing high voltage high power converters, only the voltage source inverter Multi-stage Series-connection high voltage frequency converters are suitable for this application, and this paper gives analysis of such converters. Based on Carrier Wave Phase-Shifted modulation, this paper proposes a multi-stage Series-connection high voltage frequency converter with balanced output power of the step-down transformer’s secondary windings, in which a winding burdens three symmetry three-phase to single-phase MC outputs, and the same phase outputs of the MC are cascaded at the secondary side of the transformers, letting out one phase of high-voltage AC output. The circuit is consisted of a step-down industry frequency transformer at the network side, three-phase to single-phase MC arrays, a step-up high frequency transformer at the load side and filter components. The simulation result based on MATLAB/SIMULINK shows that the proposed multi-stage Series-connection high voltage frequency converter is feasible and low-cost.

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Korotyeyev, Igor, e Beata Zięba. "Steady-state modelling method for matrix-reactance frequency converter with boost topology". Archives of Electrical Engineering 60, n.º 2 (1 de junho de 2011): 137–48. http://dx.doi.org/10.2478/v10171-011-0013-8.

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Steady-state modelling method for matrix-reactance frequency converter with boost topologyThis paper presents a method intended for calculation of steady-state processes in AC/AC three-phase converters that are described by nonstationary periodical differential equations. The method is based on the extension of nonstationary differential equations and the use of Galerkin's method. The results of calculations are presented in the form of a double Fourier series. As an example, a three-phase matrix-reactance frequency converter (MRFC) with boost topology is considered and the results of computation are compared with a numerical method.

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