Journal articles: 'Magnetic pulse generator'

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Achour, Yahia, Jacek Starzyński, and Kazimierz Jakubiuk. "New Architecture of Solid-State High-Voltage Pulse Generators." Energies 15, no. 13 (July 1, 2022): 4823. http://dx.doi.org/10.3390/en15134823.

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The application of the nanosecond pulsed electric field (nsPEF) for biomedical treatments has gained more interest in recent decades due to the development of pulsed power technologies which provides the ability to control the electric field dose applied during tests. In this context, the proposed paper describes a new architecture of solid-state high-voltage pulse generators (SS-HVPG) designed to generate fully customised sequences of quasi-rectangular pulses. The idea is based on the combination of semiconductor switches (IGBT/MOSFET) known for their flexibility and controllability with special magnetic switches to build compact and modular generators. The proposed structure is inspired by the most known pulse generator of Marx, but mixes its two variants for negative and positive polarities. Thus, the polarity of the generated pulses can be freely selected. In addition to that, the use of IGBTs/MOSFET ensures a tunable repetition rate and pulse width. The capacitors are charged via a series of magnetic switches and a flyback DC–DC converter which provides fast and efficient charging and also an adjustable amplitude of the output pulses. The design can be easily simplified giving two other modified structures, based on the same idea, for mono-polar operating (only positive or only negative pulses) with a reduced number of switches. A SPICE simulation of the generator and results of experimental tests carried out on a three stages generator are presented. The obtained results confirm the operating principle and the claimed performances of the new structure.

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Balcerak, Michał, Marcin Hołub, and Ryszard Pałka. "High voltage pulse generation using magnetic pulse compression." Archives of Electrical Engineering 62, no. 3 (September 1, 2013): 463–72. http://dx.doi.org/10.2478/aee-2013-0037.

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Abstract The paper presents an overview of a method of nanosecond-scale high voltage pulse generation using magnetic compression circuits. High voltage (up to 18 kV) short pulses (up to 1.4 μs) were used for Pulsed Corona Discharge generation. In addition, the control signal of parallel connection of IGBT and MOSFET power transistor influence on system losses is discussed. For a given system topology, an influence of core losses on overall pulse generator efficiency is analysed.

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Gao, Jingming, Song Li, Hanwu Yang, Shangdong Jin, Fanzheng Zeng, Baoliang Qian, and Chengwei Yuan. "A novel compact solid-state high power pulse generator based on magnetic switch and square waveform pulse transformer." Review of Scientific Instruments 94, no. 1 (January 1, 2023): 014707. http://dx.doi.org/10.1063/5.0110453.

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The high power pulse generators have been widely used in high power microwave generation and plasma physics research. In this paper, a novel compact solid-state high power pulse generator is studied, numerically and experimentally. The generator is mainly composed of the primary energy supply, the magnetic pulse compressor, the Blumlein type low-impedance pulse forming network, and the square waveform pulse transformer. Especially, design considerations for a solid-state high power pulse generator are proposed. Experimental results show that pulses with a peak power of 2 GW, a duration of 150 ns, and a repetitive rate of 10 Hz are continuously achieved on a dummy load. The dimension is Φ60 × 210 cm2, and the average power density reaches ∼5 W/L. Experimental results show reasonable agreement with numerical analysis.

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Степанов, Д. С., К. И. Козловский, А. П. Скрипник, and Э. Я. Школьников. "Портативный нейтронный генератор на лазерно-плазменном ионном диоде с магнитной изоляцией." Журнал технической физики 93, no. 6 (2023): 817. http://dx.doi.org/10.21883/jtf.2023.06.55607.22-23.

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The article presents a new experimental portable pulsed neutron generator based on a laser-plasma ion diode with magnetic insulation and the results of the first experiments. The laser-plasma diode makes it possible to obtain large ion current pulses that generate high-intensity neutron radiation. The source of optical radiation was a pulsed neodymium-doped yttrium aluminum garnet laser with a wavelength of 1064 nm, a pulse energy of up to 0.7 J, and a duration of ~10 ns. The ion beam is accelerated by an Arkadiev-Marx pulsed voltage generator with a voltage amplitude of up to 250 kV, a duration of up to 1.5 µs, and an energy of up to 160 J. Neutrons were generated using the reaction d(d,n)3He. A neutron yield of 2·107 neutron/pulse was obtained.

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Yuan, Qi, Zichen Deng, Weidong Ding, Yanan Wang, and Jiawei Wu. "New advances in solid-state pulse generator based on magnetic switches." Review of Scientific Instruments 93, no. 5 (May 1, 2022): 051501. http://dx.doi.org/10.1063/5.0079583.

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Pulsed power technology is gradually forming a development trend of civil-military integration, which puts forward more requirements for pulsed power generators. This paper takes magnetic switches (MSs) as the starting point and reviews recent advancements in pulse generators based on MSs. First, the working mechanism of the MS “rapid inductance drop after magnetic core saturation” is analyzed. Second, the basic uses of MSs are introduced with specific examples, namely, magnetic compression unit, saturated pulse transformer, and magnetic delay switches. Then, the typical topologies of pulse generators based on MSs are discussed, including transmission line, Marx, Fitch, linear transformer driver, and semiconductor opening switch pumping circuits. These circuits’ technical characteristics and parameter levels are highlighted. Finally, the existing problems and future development trends of MS-based solid-state pulse generators are discussed.

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Grainys, Audrius, Jurij Novickij, Tomaš Stankevič, Voitech Stankevič, Vitalij Novickij, and Nerija Žurauskienė. "Single Pulse Calibration of Magnetic Field Sensors Using Mobile 43 kJ Facility." Measurement Science Review 15, no. 5 (October 1, 2015): 244–47. http://dx.doi.org/10.1515/msr-2015-0033.

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Abstract In this work we present a mobile 43 kJ pulsed magnetic field facility for single pulse calibration of magnetic field sensors. The magnetic field generator is capable of generating magnetic fields up to 40 T with pulse durations in the range of 0.3-2 ms. The high power crowbar circuit is used for the reverse voltage protection and pulse shaping purposes. The structure, the development challenges and the implemented solutions to improve the facility for the calibration of the magnetic field sensors are overviewed. The experimental data of the application of the proposed generator for the calibration of manganite magnetic field sensors are presented.

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Tung, Tran Van, and R. S. Kashaev. "Radiofrequency generator and programmer of pulse sequences for PMR relaxometer." Power engineering: research, equipment, technology 22, no. 3 (September 8, 2020): 90–96. http://dx.doi.org/10.30724/1998-9903-2019-21-90-96.

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Described the generator of resonance radiofrequency with the step of change 50 kHz in the range 520 MHz and pulse programmer of the pulse sequences for relaxometer of proton magnetic resonance (PMR). Using algorithm of direct digital synthesis (DSP), the RF generator has the ability to produce RF signal with a short switching time and high resolution in frequency and phase. To facilitate the generation of RF pulses, used the pulse programmer implemented in the FPGA directed by the auxiliary controller DSP to generate RF pulses with required sequences and parameters. Realized the testing of the generato r by method of computer modelling in the program Quartus II 12.1 and was shown the opportunities of synthesis of RF-pulses sequences with the phases 0, π/2, π, 3π/2 with resonance frequency tuning.

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Bereka, V. O., I. V. Bozhko, O. M. Karlov, and I. P. Kondratenko. "COORDINATION OF PARAMETERS OF THE POWER SOURCE AND THE WORKING CHAMBER FOR WATER TREATMENT WITH PULSE BARRIER DISCHARGE." Tekhnichna Elektrodynamika 2023, no. 4 (June 15, 2023): 81–88. http://dx.doi.org/10.15407/techned2023.04.081.

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To determine the mutually agreed parameters of the output link of the generator of short (~100 ns) pulses with a working chamber, in which water is treated in the droplet-film state by a pulsed barrier discharge, an approximate mathematical model was developed that describes the transient processes in the circuit. The reliability of the model is confirmed by experimental data. The optimal parameters of the capacitance of the dielectric barrier and magnetic keys were calculated, according to which the efficiency of energy transfer to the working chamber reaches 62%. It is shown that it largely depends on the ratio of the barrier capacity of the working chamber to the output capacity of the pulse generator, the optimal value of which is ≈2.6. The selection of the value of the dissipation inductance of the magnetic key, through which the discharge of the barrier capacity occurs after the end of the direct current pulse, is justified. It was established that the consistency of the parameters of the output link of the pulse generator and the working chamber makes it possible to significantly reduce the thermal load on the fast-acting opening diode in the output link of the pulse generator. References 15, Figures 8.

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Kondratenko, I. P., A. N. Karlov, and R. S. Kryshchuk. "CONTROL STRATEGIES TO ELIMINATE HARMONICS IN POWER GENERATION SYSTEMS BASED ON A DOUBLY-FED INDUCTION GENERATOR." Praci Institutu elektrodinamiki Nacionalanoi akademii nauk Ukraini, no. 61 (May 25, 2022): 5–12. http://dx.doi.org/10.15407/publishing2022.61.005.

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The action of high-density pulsed currents (109 A/m2) leads to the appearance of the electro-plastic effect in metal products. It is proposed to use magnetic pulse treatment of nonmagnetic plates by electromagnetic inductors with a U-shaped magnetic circuit for local flow pulsed currents in the nonmagnetic plates. The work aims to establish an influence of a ferromagnetic platform with nonlinear magnetic permeability on pulsed eddy currents and magnetic pressure of nonmagnetic metal plates with different electrical conductivity in modeling magnetic pulse treatment of welded joints to achieve the electro-plastic effect. Numerical simulation of pulsed electromagnetic fields by the finite element method is used. The current calculation in the inductor's winding is performed by solving the equations of the magnetic field and the electric circuit equations for a discrete-time interval. A power source is a capacitor that is charged to a specific voltage. To study the effect of the ferromagnetic platform on eddy currents and forces in a nonmagnetic plate with its different electrical conductivity, the same pulsed current in the inductor's winding is used. The dependence of amplitude values of eddy current density and magnetic pressure on the surfaces of nonmagnetic plates of different electrical conductivity is investigated. The influence of the presence and absence of a ferromagnetic platform and its electrical conductivity and magnetic permeability on the values of eddy currents and magnetic pressure in the nonmagnetic plate have been studied. Ref. 13, fig. 7, table.

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Golubev, V. V., V. I. Zozulev, Yu V. Marunya, and А. І. Storozhuk. "METHODS OF INCREASING THE ENERGY EFFICIENCY OF SPECIALIZED ELECTRICITY CONVERTERS FOR MODERN PULSE TECHNOLOGIES." Praci Institutu elektrodinamiki Nacionalanoi akademii nauk Ukraini 2023, no. 65 (August 28, 2023): 106–11. http://dx.doi.org/10.15407/publishing2023.65.108.

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The article examines the proposed power electronics devices with an assessment of their basic quality indicators and functional purpose. The following of these devices have been identified, the use of which increases the e nergy efficiency of electrical networks the most. It is shown that these devices, due to their improved functional and parametric data, are also widely used in electrical consumer devices. Here are some of the mentioned devices. Combined and Controlled Latour-Gretz Rectifiers, Magnetic Semiconductor Pulse Regulators, DC/DC Pulse Converters, DC/AC Converters, DC/AC Converters, Full Thyristor Transistor Switch - VTS, Controlled Magneto-Semiconductor Generator pulses, an improved structural diagram of a magnetic semiconductor pulse generator. It was concluded that the following quality indicators of the above devices are the most acceptable for increasing the energy efficiency of electrical networks on the part of devices that are powered by them: high efficiency; improved electromagnetic compatibility; protection against short circuits and switching overvoltages; controllability according to load requirements; buffer resistance against interruption of the input current. Ref. 7, fig. 7. Keywords: energy efficiency of electrical networks, combined and controlled Latour-Gretz rectifiers, magnetic semi-conductor regulators and pulse generators, pulse converters DC/DC, DC/AC.

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Yanuka, D., S. Efimov, M. Nitishinskiy, A. Rososhek, and Ya E. Krasik. "Generation of strong pulsed magnetic fields using a compact, short pulse generator." Journal of Applied Physics 119, no. 14 (April 14, 2016): 144901. http://dx.doi.org/10.1063/1.4945814.

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Golubev, V. V., V. I. Zozulev, Yu V. Marunia, and A. I. Storozhuk. "DEVELOPMENT OF CONSTRUCTION PRINCIPLES AND IMPROVEMENT OF MAGNETIC-SEMICONDUCTOR PULSE DEVICES OF POWER CONVERSION TECHNOLOGY." Praci Institutu elektrodinamiki Nacionalanoi akademii nauk Ukraini 2022, no. 62 (August 18, 2022): 34–40. http://dx.doi.org/10.15407/publishing2022.62.034.

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The principles of construction and improvement of magnetic-semiconductor devices of power converter technology using a complex synthesis of their elements, keys, nodes, and structures are considered in specific examples. The advan-tages are presented: synthesized semiconductor, magnetic and magnetic-semiconductor switches; combined single-phase power supply rectifiers; autotransformer multilevel voltage inverters; voltage converters with input current buffer node; pulse compression units with voltage doubling and generating special output pulses; the structure of a magnetic-semiconductor pulse generator assembled from the indicated components. It is shown that these advantages in comparison with known analogs include improved efficiency, quality of input electricity, efficient use of pulsed power supply by loads, simplification, and expansion of the functionality of the synthesized objects. As a result, materials were obtained. It was determined that it would be expedient to use and develop the presented complex synthesis concerning other objects of research of magnetic-semiconductor pulse devices of power converter technology. Ref. 9, fig. 8.

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Zhang, Haoran, Ting Shu, Shifei Liu, Zicheng Zhang, Lili Song, and Heng Zhang. "A Compact Modular 5 GW Pulse PFN-Marx Generator for Driving HPM Source." Electronics 10, no. 5 (February 26, 2021): 545. http://dx.doi.org/10.3390/electronics10050545.

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A compact and modular pulse forming network (PFN)-Marx generator with output parameters of 5 GW, 500 kV, and 30 Hz repetition is designed and constructed to produce intense electron beams for the purpose of high-power microwave (HPM) generation in the paper. The PFN-Marx is composed by 22 stages of PFN modules, and each module is formed by three mica capacitors (6 nF/50 kV) connected in parallel. Benefiting from the utilization of mica capacitors with high energy density and a mini-trigger source integrated into the magnetic transformer and the magnetic switch, the compactness of the PFN-Marx system is improved significantly. The structure of the PFN module, the gas switch unit, and the connection between PFN modules and switches are well designed for modular realization. Experimental results show that this generator can deliver electrical pulses with the pulse width of 100 ns and amplitude of 500 kV on a 59-ohm water load at a repetition rate of 30 Hz in burst mode. The PFN-Marx generator is fitted into a cuboid stainless steel case with the length of 80 cm. The ratio of storage energy to volume and the ratio of power to weight of the PFN-Marx generator are calculated to be 6.5 J/L and 90 MW/kg, respectively. Furthermore, utilizing the generator to drive the transit time oscillator (TTO) at a voltage level of 450 kV, a 100 MW microwave pulse with the pulse width of 20 ns is generated.

14

Kuthi, Andras, and Jason M. Sanders. "Stepped Impedance Magnetic Compression Line Pulse Generator." IEEE Transactions on Plasma Science 42, no. 4 (April 2014): 984–87. http://dx.doi.org/10.1109/tps.2014.2306196.

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Li, Song, Jing-Ming Gao, Han-Wu Yang, and Bao-Liang Qian. "A high-voltage, long-pulse generator based on magnetic pulse compressor and Blumlein-type rolled strip pulse forming line." Laser and Particle Beams 33, no. 3 (July 1, 2015): 511–18. http://dx.doi.org/10.1017/s0263034615000567.

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AbstractIn this paper, a new technical scheme of high-voltage, long-pulse generator, mostly based on solid-state power devices, including magnetic pulse compressor, Blumlein-type rolled strip pulse-forming line (RSPFL) and inductive voltage adder (IVA), is proposed and investigated numerically and experimentally. The generator has potential advantages of high average power level, high repetitive rate capability, long lifetime, and long pulse achievability, which meet the requirements of military and industrial application of the pulsed power technology. Specifically, a two-stage magnetic pulse compressor was set up with iron-based amorphous cores. Total compression ratio of the device is approximately 12 and the achieved voltage efficiency is up to 92%. Low impedance, long-duration Blumlein-type RSPFL was established with characteristic impendence and electrical length of 3 Ω and 100 ns, respectively. Mylar film was selected as the solid-state dielectric. Increased by a four-stage IVA, typical quasi-square pulse was obtained with peak current of 2.3 kA and duration over 200 ns. As the resistance of the dummy load was measured to be 60 Ω, the peak voltage was approximately 138 kV. Experiments show reasonable agreement with numerical analysis.

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Iqbal, Muhammad Zahid, Asif Israr, and Tanveer Abbas. "Semi Active Control of sinusoidal shock waveform on drop test machine (DTM) using non-linear dynamic model of hybrid wave generator (HWG) consisting of rubber and electroMagnet." Review of Scientific Instruments 94, no. 3 (March 1, 2023): 035005. http://dx.doi.org/10.1063/5.0124138.

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Sinusoidal shock waveforms are the classical type of waveforms generated in Drop Test Machines (DTMs) using Rubber Wave Generators (RWGs). For different specifications of pulse, different RWGs are used, leading to the laborious work of replacing RWGs in DTMs. In this study, a novel technique is developed to predict a shock pulse of variable height and time using a Hybrid Wave Generator (HWG) that yields variable stiffness. This variable stiffness is a combination of the fixed stiffness of rubber and the variable stiffness of magnet. A mathematical nonlinear model has developed, consisting of a polynomial model of RWG and an integral approach of magnetic force. The designed HWG is capable enough to produce a strong magnetic force as a result of a high magnetic field generated in the solenoid. This magnetic force combines with rubber to give a variable stiffness effect. This way, a semi-active control of the stiffness and pulse shape is achieved. Two sets of HWGs are tested to study the control over the shock pulse. An average hybrid stiffness from 32 to 74 kN/m is observed by varying voltage from 0 to 1000 VDC, resulting in a change of height of pulse from 18 to 56 g (net change 38 g) and a change of shock pulse width from 17 to 12 ms (net change 5 ms). From experimental results, it is concluded that the developed technique gives satisfactory results for the control/prediction of variable shape shock pulse.

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Jin, Renfeng, Subrata Halder, Walter R. Curtice, James C. M. Hwang, and Choi L. Law. "Sub-Nanosecond Greater-Than-10-V Compact Tunable Pulse Generator for Low-Duty-Cycle High-Peak-Power Ultra-Wideband Applications." Active and Passive Electronic Components 2011 (2011): 1–8. http://dx.doi.org/10.1155/2011/871474.

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An ultra-wideband pulse generator was designed and fabricated in GaAs HBT IC technology. The generator includes delay and differential circuits to convert a TTL input into a Gaussian pulse signal as well as a Class-C amplifier to boost the pulse amplitude while compressing the pulse width. By adjusting the collector bias of the Class-C amplifier, the pulse amplitude can be varied linearly between 3.5 V and 11.5 V while maintaining the pulse width at 0.3 ± 0.1 nanosecond. Alternatively, by adjusting the base bias of the Class-C amplifier, the pulse width can be varied linearly between 0.25 ns and 0.65 ns while maintaining the pulse amplitude at 10 ± 1 V. Finally, the amplified Gaussian signal can be shaped into a monocycle signal by anL-Cderivative circuit. The present pulse generator compares favorably with pulse generators fabricated in CMOS ICs, step-recovery diodes, or other discrete devices.

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Petkov, A. A. "FORMING CAPABILITIES OF A PULSE MAGNETIC FIELD GENERATOR." Electrical Engineering & Electromechanics, no. 2 (April 28, 2015): 68–71. http://dx.doi.org/10.20998/2074-272x.2015.2.13.

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Shikura, Tatsuyuki, Masaki Sakuma, Toshiaki Sonoda, and Yoshio Iguchi. "Nanosecond Rise Time Generator for Electro-Magnetic Pulse." IEEJ Transactions on Power and Energy 124, no. 4 (2004): 653–60. http://dx.doi.org/10.1541/ieejpes.124.653.

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Glyavin, M. Yu, K. A. Zhurin, E. A. Kopelovich, A. G. Luchinin, M. V. Morozkin, and F. A. Flat. "A pulse magnetic-field generator for terahertz gyrodevices." Instruments and Experimental Techniques 54, no. 1 (January 2011): 77–80. http://dx.doi.org/10.1134/s0020441211010064.

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Zhuang, Longyu, Kai Zhu, Junfeng Rao, and Jie Zhuang. "Solid-state Marx generator based on saturable pulse transformer and fast recovery diodes." Journal of Instrumentation 18, no. 10 (October 1, 2023): P10036. http://dx.doi.org/10.1088/1748-0221/18/10/p10036.

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Abstract Solid-state compact Marx generator using saturable pulse transformer (SPT) and fast recovery diodes has been proposed. The primary circuit is switched by three MOSFETs connected in parallel. The SPT functions as a step-up transformer to increase the voltage amplitude and as a closing switch for the secondary circuit. Meanwhile, all the SPTs share the same magnetic core to achieve a compact structure and ensure good synchronization. The energy storage capacitors on the secondary sides are charged through the unsaturated SPT. When the SPT saturates, the capacitors firstly transfer a little energy to the saturated inductors through the diodes reversely during their reverse recovery process. Currents rise quickly in these inductors until diodes totally recover to reverse blocking state. Then capacitors discharge in series to the load and high-voltage pulses are generated over the load. With the currents in the saturated inductors, the front edges of pulses are no longer affected by them but are dominated the turn-off speed of the diodes, which makes high-voltage and high-current pulses with short front edges possible. The regular and cheap fast recovery diodes in the generator act as semiconductor opening switch to sharpen the pulse front edges. Experiments were carried out with a 4-stage Marx generator prototype, 10.8-kV high-voltage pulses with a front edge of 11 ns, a pulse width of 190 ns, were obtained over a 100-Ω resistive load. The total energy efficiency is 49.8%. The proposed Marx generator using regular fast recovery diodes is compact, cheap, and efficient to generate high-voltage pulses with short front edges.

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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 calculated ratios will find application for practical use. In the course of the work, methods of the theory of electric circuits, magnetic field, elements of mathematical analysis and the theory of electrical oscillatory processes (beating, resonance, etc.) in complex circuits were used. As a result, a ratio is obtained that determines the maximum value of the beat frequency between two electrical circuits connected by a weak capacitive coupling, creating a magnetic accumulation generator with high microwave radiation and with the possibility of its regulation. The results of the work will be used in power engineering (an ice control unit, a shunt reactor to increase the power factor, etc.), mechanical engineering, medicine (cardiology), military equipment, etc. In the future, it is planned to use the obtained results of work in the direction of studying the use of a pulsed electromagnetic field for dewatering and desalting oil, which will lead to an increase in the efficiency of existing installations in practice. Aims of research Development of the design of a high-voltage electromechanical two-spiral voltage source based on a magnetic accumulation generator and a voltage multiplier with improved characteristics, theoretical and experimental studies with subsequent conclusions and recommendations. Studies of the proposed double-spiral MAG and the development of an event for its further practical application. Research methods Methods of mathematical modeling, research and testing of high voltage equipment. Results A pilot design of a high-voltage electromechanical two-spiral voltage source based on a magnetic accumulation generator and a voltage multiplier with improved characteristics is proposed, calculated ratios with experimental research and proposals for implementation in individual industries and testing laboratories are obtained on the basis of the created mathematical model. Keywords: magnetic accumulation generator, multiplier, electric explosion, simulation, liner, double-spiral solenoid, oscillatory process

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Evans, Mathew D. G., Valentin J. P. Baillard, Pablo D. G. Maqueo, Jeffrey M. Bergthorson, and Sylvain Coulombe. "Compact Nanosecond Magnetic Pulse Compression Generator for High-Pressure Diffuse Plasma Generation." IEEE Transactions on Plasma Science 45, no. 8 (August 2017): 2358–65. http://dx.doi.org/10.1109/tps.2017.2716116.

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Ma, Shangang, Xinjie Yu, and Zhen Li. "XRAM Pulse Current Generator With Magnetic Flux Compression Effect." IEEE Transactions on Plasma Science 45, no. 7 (July 2017): 1190–95. http://dx.doi.org/10.1109/tps.2017.2701001.

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Makeev, V. A., V. I. Gusel’nikov, A. V. Stepanov, E. G. Furman, and Fu Quan Wang. "A magnetic-thyristor pulse generator for electric-discharge technologies." Instruments and Experimental Techniques 49, no. 4 (July 2006): 531–33. http://dx.doi.org/10.1134/s0020441206040142.

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Zhang, Yu, and Jinliang Liu. "High-voltage pulse modulator based on cylindrical self-coupling saturable pulse transformer and solid-state Marx generator." Laser and Particle Beams 32, no. 1 (January 14, 2014): 99–108. http://dx.doi.org/10.1017/s0263034613001031.

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AbstractHigh-voltage pulse modulator has broad applications in industry. In order to pursue the qualities of compactness, solidification, and long life time, a high-voltage pulse modulator based on a helical Blumlein pulse forming line (HBPFL),a Marx generator and a self-coupling saturable pulse transformer (SPT) with fully cylindrical coaxial conductors is put forward and investigated in this paper. A new method that the fully cylindrical SPT simultaneously works as the charging pulse transformer and magnetic switch of the HBPFL is put forward and demonstrated. Traditional spark gap is substituted by the SPT to enable the features of solidification, compactness, and long life time of the modulator. Experimental results showed that the SPT had good response characteristics to short sinusoidal pulse and 100 ns-range square pulses. The fully cylindrical SPT driven by the 50–70 kV Marx generator can suppress the saturated inductance of the secondary windings to a level less than 500 nH, due to the strong reversed mutual induction between cylindrical windings after the core saturated. It also demonstrated that the pulse modulator was able to deliver a high-voltage pulse to a 160 Ω load, with amplitude of 148 kV, pulse duration of 130 ns, and pulse rise time ranging from 60 to 105 ns.

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Novickij, Vitalij, Janja Dermol, Audrius Grainys, Matej Kranjc, and Damijan Miklavčič. "Membrane permeabilization of mammalian cells using bursts of high magnetic field pulses." PeerJ 5 (April 26, 2017): e3267. http://dx.doi.org/10.7717/peerj.3267.

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Background Cell membrane permeabilization by pulsed electromagnetic fields (PEMF) is a novel contactless method which results in effects similar to conventional electroporation. The non-invasiveness of the methodology, independence from the biological object homogeneity and electrical conductance introduce high flexibility and potential applicability of the PEMF in biomedicine, food processing, and biotechnology. The inferior effectiveness of the PEMF permeabilization compared to standard electroporation and the lack of clear description of the induced transmembrane transport are currently of major concern. Methods The PEMF permeabilization experiments have been performed using a 5.5 T, 1.2 J pulse generator with a multilayer inductor as an applicator. We investigated the feasibility to increase membrane permeability of Chinese Hamster Ovary (CHO) cells using short microsecond (15 µs) pulse bursts (100 or 200 pulses) at low frequency (1 Hz) and high dB/dt (>106 T/s). The effectiveness of the treatment was evaluated by fluorescence microscopy and flow cytometry using two different fluorescent dyes: propidium iodide (PI) and YO-PRO®-1 (YP). The results were compared to conventional electroporation (single pulse, 1.2 kV/cm, 100 µs), i.e., positive control. Results The proposed PEMF protocols (both for 100 and 200 pulses) resulted in increased number of permeable cells (70 ± 11% for PI and 67 ± 9% for YP). Both cell permeabilization assays also showed a significant (8 ± 2% for PI and 35 ± 14% for YP) increase in fluorescence intensity indicating membrane permeabilization. The survival was not affected. Discussion The obtained results demonstrate the potential of PEMF as a contactless treatment for achieving reversible permeabilization of biological cells. Similar to electroporation, the PEMF permeabilization efficacy is influenced by pulse parameters in a dose-dependent manner.

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Bereka, V. O., and I. P. Kondratenko. "MATCHING OF COMPATIBLE WORK OF SHORT HIGH-VOLTAGE PULSES OF TENSION GENERATOR AND WATER TREATMENT CHAMBER BY DINT OF PULSE BARRIER DISCHARGE." Praci Institutu elektrodinamiki Nacionalanoi akademii nauk Ukraini 2021, no. 60 (December 10, 2021): 21–27. http://dx.doi.org/10.15407/publishing2021.60.021.

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A technique for calculating the parameters of a magnetic switch as an element of a generator of short high-voltage pulses of tension to coordinate its compatible work with a water treatment chamber by dint of pulse barrier discharge is shown. The expediency and efficiency of using such a switch as an element that, by shunting, the discharge chamber, discharges the barrier to the arrival of the next voltage pulse has been confirmed. It is proved that with the accepted geometrical dimensions of the discharge chamber and the amplitude of the pulse voltage, provided that the magnetic switch is present that it is possible to increase the practical use of electricity by ~ 40% due to that which was accumulated in the dielectric barrier in one discharge. Ref.10, fig. 5.

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Li, Huan, Hong Fa Ding, and Hou Xiu Xiao. "A Repeated Pulsed High Magnetic Field Generator for Frequency-Tunable Terahertz Sources." Advanced Materials Research 516-517 (May 2012): 1897–901. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.1897.

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This paper presents a Repeated Pulsed High Magnetic Field (RPHMF) generator for frequency-tunable terahertz sources, which mainly consists of a charging power supply, a capacitor bank, a discharging switch, a bitter magnet and other facilities. The four thyristors (80 mm, 4 kV) in series with a self-supplied gate driver are taken as the discharge switch which can be triggered when the high voltage capacitor C was charged to 300 V. Meanwhile, a bitter magnet with fast heat dissipation was designed and fabricated. According to the experiment, the designed system has a pulse repetition frequency of 0.1 Hz with a maximum magnetic field of 9 T.

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Shang, Tianyi, Saikang Shen, Guoxiang Sun, and Weidong Ding. "Long-duration bipolar linear transformer driver based on a multi-turn half-bridge structure." Journal of Instrumentation 18, no. 05 (May 1, 2023): P05039. http://dx.doi.org/10.1088/1748-0221/18/05/p05039.

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Abstract All-solid linear transformer driver(LTD) generators are widely used to output unipolar high-voltage rectangular pulses in nanoseconds. However in some applications, the bipolar output is necessary and the size of the generator is limited, which is challenging for LTD topology because the size of the magnetic core is related directly to the amplitude and pulse duration of the output waveforms. In this paper, a bipolar long-duration pulse generator based on the topology of a linear transformer driver combined with a half-bridge and multi-turn structure is put forward. The half-bridge topology can output bipolar waveforms easily and can save the number of switches used in the generator. To eliminate the crosstalk voltage that appears during operation, a differential mode inductance is used to protect the circuit. A snubber circuit is applied to suppress the reverse overshoot. The multi-turn design is chosen to make the size more compact. However, the multi-turn usually leads to a lower rise speed. To improve the performance, an optimization method that improves the rising speed by changing the turns of each stage is discussed. The strategy is useful and can be applied on some other occasions. The generator can output bipolar waveforms whose amplitudes are 4 kV and the duration can be adjusted from 200 ns to 800 ns. The rise time can be limited to 70 ns. The size of the generator is 10 cm * 10 cm * 15 cm, which is compact compared to the generators put forward before.

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Gwóźdź, M., M. Krystkowiak, C. Jędryczka, A. Gulczyński, and D. Matecki. "Generator with modulated magnetic flux for wind turbines." Bulletin of the Polish Academy of Sciences Technical Sciences 65, no. 4 (August 1, 2017): 469–78. http://dx.doi.org/10.1515/bpasts-2017-0052.

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AbstractIn the paper, the concept of a permanent magnet synchronous generator (PMSG) with uniquely designed stator windings for wind turbines is presented. Two 3-phase windings in the stator are used, one of which is connected in the star, while the other in the delta configuration. Six-pulse rectifiers, mutually coupled by the pulse transformer, whose primary winding is supplied by the so-called “current modulator”, are placed at the outputs of both windings. The modulator output current should meet all the necessary and strict requirements. Both rectifiers operate on a common DC circuit. These solutions provide the sinusoidal magnetomotive force in the stator of the PMSG and the quasi-sinusoidal (taking into account the non-linearity of the magnetic circuit) magnetic flux. In light of the generator principle, it has been called the “PMSG with modulated the magnetic flux”. The slightly higher complexity in the structure of the generator, as compared to the normal three-phase construction, is compensated by the exceptional simplicity of the power electronics section of the system, which allows high efficiency to be reached. The current modulator (as well as the pulse transformer) is a power electronics converter with a relatively low output power as compared to the overall output power of the system. In comparison to other known solutions, the expected cost of the system should be lower. It is also expected that a high degree of reliability in terms of its operation will be achieved, and consequently, that the the ongoing costs of its maintenance will be reduced. In the paper, concept, theoretical basis of operation, and results of the studies of the simulation models of the generator, including the basic power electronics section, are presented.

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Stankevič, Voitech, Skirmantas Keršulis, Justas Dilys, Vytautas Bleizgys, Mindaugas Viliūnas, Vilius Vertelis, Andrius Maneikis, Vakaris Rudokas, Valentina Plaušinaitienė, and Nerija Žurauskienė. "Measurement System for Short-Pulsed Magnetic Fields." Sensors 23, no. 3 (January 28, 2023): 1435. http://dx.doi.org/10.3390/s23031435.

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A measurement system based on the colossal magnetoresistance CMR-B-scalar sensor was developed for the measurement of short-duration high-amplitude magnetic fields. The system consists of a magnetic field sensor made from thin nanostructured manganite film with minimized memory effect, and a magnetic field recording module. The memory effect of the La1−xSrx(Mn1−yCoy)zO3 manganite films doped with different amounts of Co and Mn was investigated by measuring the magnetoresistance (MR) and resistance relaxation in pulsed magnetic fields up to 20 T in the temperature range of 80–365 K. It was found that for low-temperature applications, films doped with Co (LSMCO) are preferable due to the minimized magnetic memory effect at these temperatures, compared with LSMO films without Co. For applications at temperatures higher than room temperature, nanostructured manganite LSMO films with increased Mn content above the stoichiometric level have to be used. These films do not exhibit magnetic memory effects and have higher MR values. To avoid parasitic signal due to electromotive forces appearing in the transmission line of the sensor during measurement of short-pulsed magnetic fields, a bipolar-pulsed voltage supply for the sensor was used. For signal recording, a measurement module consisting of a pulsed voltage generator with a frequency up to 12.5 MHz, a 16-bit ADC with a sampling rate of 25 MHz, and a microprocessor was proposed. The circuit of the measurement module was shielded against low- and high-frequency electromagnetic noise, and the recorded signal was transmitted to a personal computer using a fiber optic link. The system was tested using magnetic field generators, generating magnetic fields with pulse durations ranging from 3 to 20 μs. The developed magnetic field measurement system can be used for the measurement of high-pulsed magnetic fields with pulse durations in the order of microseconds in different fields of science and industry.

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Chuvatin, A. S., A. A. Kim, V. A. Kokshenev, B. M. Kovalchuk, F. Lassalle, H. Calamy, and M. Krishnan. "Design criteria and validation of a vacuum load current multiplier on a mega-ampere microsecond inductive storage generator." Laser and Particle Beams 28, no. 3 (June 11, 2010): 361–69. http://dx.doi.org/10.1017/s0263034610000224.

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AbstractThe load current multiplier concept (LCM) was suggested for improving the energy transfer efficiency from pulse power generators to loads. The concept was initially demonstrated at atmospheric pressure and dielectric insulation on a compact, 100 kA, microsecond capacitor bank. This paper reports on the LCM design criteria for mega-ampere vacuum pulse power when the LCM comprises a large-inductance magnetic flux extruder cavity without a magnetic core. The analytical and numerical design approach presented was experimentally validated on GIT12 mega-ampere inductive energy storage generator with a constant-inductance load. The LCM technique increased the peak load current from typically 4.6 MA at 1.87 µs on this generator, to 6.43 MA at 2.0 µs. The electromagnetic power into a ~10 nH load increased from 100 GW to 230 GW. This result is in good agreement with the presented numerical simulations and it corresponds to a 95% increase of the achievable magnetic pressure at 8 cm radius in the load. The compact, LCM hardware allows the GIT12 generator to operate more efficiently without modifying the stored energy or architecture. The demonstrated load power and energy increase using the LCM concept is of importance for further studies on power amplification in vacuum and high energy density physics.

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Rakitin, V. V., and S. G. Rusakov. "Memristor Based Pulse Train Generator." Russian Microelectronics 48, no. 4 (July 2019): 255–61. http://dx.doi.org/10.1134/s1063739719040073.

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Kwon, Young-Min, Min-Wook Hwang, and Kwang-Cheol Ko. "Analysis and Design of a Pulsed Power Generator for a Low-Energy Magnetic Pulse Welding System." Electronics 12, no. 24 (December 7, 2023): 4921. http://dx.doi.org/10.3390/electronics12244921.

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Magnetic pulse welding (MPW) is a joining method that uses Lorentz force generated from an electromagnetic field. This method not only has the advantage of not causing thermal deformation of the material and no by-products compared to the method of joining by melting by heat but also enables the joining of dissimilar metals rather than the joining of the same metal. Joining dissimilar metals can reduce the weight of mechanical devices and apply them to various fields. Recent research on MPW has focused on the characteristics of bonding according to the material or structure of metal rather than on pulse power research that generates the main factor of operation. However, in the operation of MPW, a Lorentz force is generated by the induced current caused by the electromotive force created in the flyer tube and the external magnetic field in the actuator. Therefore, it is necessary to analyze and optimize the pulse power to improve reliability and to miniaturize the system to expand the MPW utilization range. In this paper, we analyzed MPW operation according to a section of the pulse power output waveform. A condition for obtaining the maximum current in the flyer tube was proposed, and a plateau-shaped waveform was derived as an ideal output waveform capable of maintaining the Lorentz force. Through analysis, the proposed pulse power device is designed as a pulse-forming network (PFN) that generates a plateau output waveform. The design specification is that the circuit of PFN (type E) is designed so that the output waveform is pulse width 10 (μs) and the maximum output current is 100 (kA), and it is verified by simulation.

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Yang Shi, 杨实, 钟辉煌 Zhong Huihuang, 钱宝良 Qian Baoliang, 杨汉武 Yang Hanwu, and 孟志鹏 Meng Zhipeng. "Long pulse, ultra-low impedance pulse generator based on magnetic switch and strip line." High Power Laser and Particle Beams 22, no. 9 (2010): 2214–18. http://dx.doi.org/10.3788/hplpb20102209.2214.

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Zhang, Yu, Jinliang Liu, Xinbing Cheng, Guoqiang Bai, Hongbo Zhang, Jiahuai Feng, and Bo Liang. "A compact high-voltage pulse generator based on pulse transformer with closed magnetic core." Review of Scientific Instruments 81, no. 3 (March 2010): 033302. http://dx.doi.org/10.1063/1.3321494.

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Zhang, Dongdong, Yuan Zhou, Jue Wang, and Ping Yan. "A compact, high repetition-rate, nanosecond pulse generator based on magnetic pulse compression system." IEEE Transactions on Dielectrics and Electrical Insulation 18, no. 4 (August 2011): 1151–57. http://dx.doi.org/10.1109/tdei.2011.5976109.

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Zhang Dongdong, 张东东, 周媛 Zhou Yuan, 李文峰 Li Wenfeng, 许家雨 Xu Jiayu, 王珏 Wang Jue, 邵. 涛. Shao Tao, 赵莹 Zhao Ying, and 徐蓉 Xu Rong. "All-solid-state high-repetition-rate magnetic pulse compression generator." High Power Laser and Particle Beams 24, no. 4 (2012): 889–92. http://dx.doi.org/10.3788/hplpb20122404.0889.

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Gorbachev, K. V., E. V. Nesterov, V. Yu Petrov, and E. V. Chernykh. "A helical-radial magnetic cumulation fast-growing current pulse generator." Instruments and Experimental Techniques 52, no. 1 (January 2009): 58–64. http://dx.doi.org/10.1134/s0020441209010096.

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Ting, Joseph W., Daniel J. Rubins, D. ‐J Huang, and J. L. Erskine. "A high current pulse generator for magnetizing thin magnetic films." Review of Scientific Instruments 67, no. 11 (November 1996): 3948–50. http://dx.doi.org/10.1063/1.1147296.

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Tang, Weinan, and Weimin Wang. "Highly integrated gradient pulse generator for magnetic resonance imaging system." Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering 39B, no. 2 (April 2011): 59–63. http://dx.doi.org/10.1002/cmr.b.20190.

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刘, 颖. "Research Progress of Nuclear Magnetic Resonance Pulse Sequence Generator Integration." Software Engineering and Applications 12, no. 02 (2023): 242–49. http://dx.doi.org/10.12677/sea.2023.122024.

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Liang, Zhen Guang, and Ming Yuan Yang. "Immunity Test of a Microcontroller by Using Transmission Line Pulse Generator." Advanced Materials Research 860-863 (December 2013): 2296–99. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.2296.

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Electrostatic discharge is a familiar interfere. Repeatability of discharge current is poor. Transmission line pulse (TLP) is used in study of immunity of a microcontroller. A TLP generator is first manufactured with the rise time of output pulse less than 1ns. Then couplings by electric field probe, magnetic field probe and direct injection are presented. And immunity test of a microcontroller is done by using the TLP generator and probes. Results show that the tested microcontroller is more sensitive to magnetic field interference; reset pin and crystal oscillator pin of the chip are more sensitive than other pins under action of direct injection interference.

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Cassabli, Salam Bussi EP Michel, G. M. Suchkov, S. Yu Plesnetsov, R. P. Mygushchenko, O. Yu Kropachek, and Yu O. Plesnetsov. "GENERATOR OF POWERFUL HIGH-FREQUENCY PACKAGE CURRENT PULSES FOR POWER SUPPLY OF ULTRASONIC ELECTROMAGNETIC-ACOUSTIC TRANSDUCERS." METHODS AND DEVICES OF QUALITY CONTROL, no. 2(43) (December 24, 2019): 88–95. http://dx.doi.org/10.31471/1993-9981-2019-2(43)-88-95.

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It is possible to increase the sensitivity of electromagnetic-acoustic transducers by three main methods: increasing the induction of a polarizing magnetic field; increase in strength of high-frequency current in the inductor of the converter; using modern methods of processing information packet pulses excited and received from the product. The increase in magnetic field induction of the converter is limited by the capabilities of modern powerful permanent magnets. In addition, there are significant difficulties in monitoring ferromagnetic control samples, due to the large pressing force between the sample and the transducer and sticking of scale to the transducer. Usage of modern processing methods significantly complicates and increases the cost of electromagnetic-acoustic testing devices. Of the selected sensitivityincreasingmethods, the most acceptable way is to increase the power of high-frequency current generators under the condition of excitation of packet pulses. Power supply process of the converter is carried out in two stages. Meander type powerful high-frequency current pulses are excited, which ensures operation of the output transistors in key mode. Isolation of a powerful sinusoidal high-frequency packet current pulse is carried out directly on the electromagnetic - acoustic transducer, the elements of which are included in the resonant circuit with low quality factor. Based on the transistors switched in the push-pull circuit in the key mode, a small-sized generator design has been created that excites a peak current of up to 800 A in the electromagnetic-acoustic transducer and a voltage of up to 3 kV in the transducer in the frequency range 0.3 ... 8 MHz. It was experimentally determined that the new design of the probe pulse generator made it possible to increase the amplitude of pulses reflected from a flat-bottom reflector with a diameter of 2 mm with respect to the interference amplitude by more than 2 times.

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Belozerov, O., Ya E. Krasik, J. G. Leopold, S. Pavlov, Y. Hadas, K. Kuchuk, and E. Schamiloglu. "Characterizing the high-power-microwaves radiated by an axial output compact S-band A6 segmented magnetron fed by a split cathode and powered by a linear induction accelerator." Journal of Applied Physics 133, no. 13 (April 7, 2023): 133301. http://dx.doi.org/10.1063/5.0138769.

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In a recent publication [J. Appl. Phys. 131, 023301 (2022)], microwave generation by a segmented A6 S-band axial output relativistic magnetron (RM) fed by a split cathode and powered by a small pulsed power generator was demonstrated for the first time. In the present article, we add to the same RM a mode converter and an antenna and drive it by using a modified linear induction accelerator (LIA) (≤450 kV, ≤4 kA, ∼150 ns). It was found that the operation of the RM for a split cathode or a common explosive emission cathode differs significantly. For a split cathode, we optimize for the best microwave output, its geometrical parameters, the external magnetic field, and the LIA's charging voltages. For the optimal choice of these parameters, the RM generates ∼160 ns long microwave pulses of ∼130 MW, 1.78 GHz frequency with an electronic efficiency of ∼40%, without pulse shortening. On the other hand, a common solid cathode fed RM showed microwave pulse shortening. We demonstrated that the segmented anode allows using a μs-timescale magnetic field, making it possible for the RM to operate repetitively.

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Lee, Kern, Sunghoon Hong, and Woosang Lee. "Particle-in-cell model of a relativistic magnetron system driven by a pulse forming network Marx generator." Journal of Applied Physics 131, no. 9 (March 7, 2022): 094901. http://dx.doi.org/10.1063/5.0085027.

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A three dimensional particle-in-cell (PIC) model of a relativistic magnetron (RM) is established using CST Studio Suite. As we adopted a novel technique to imitate pulse forming action of pulser, simulation domain is now fully extended to include a pulser, a transmission line, and a magnetron tube. This feature enables the model to describe a dynamic power coupling process between the pulser and RM in a self-consistent manner. It is demonstrated that model accuracy is strongly dependent on user-defined parameters for an explosive electron emission model. Particularly, emission rise time for space charge formation influences significantly on an initial mode competition phase. Compared to a previous excitation method using a step voltage pulse, the new model gives more reliable results as the intrinsic impedance of the pulser is now considered. Our model is able to estimate the major RM characteristics over a wide range of an external magnetic field. As a result of dynamic power coupling, the RM impedance, the gap voltage, the excitation frequency, and the output power tend to increase at a higher external magnetic field condition. It is suitable to adopt a proposed modeling technique for the virtual assemble and simulation of the system. Hence, it will suggest a practical way to implement and verify complicated structures or innovative designs that could not be solved by existing PIC codes.

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Mi, Yan, Meng-Nan Zhang, Chi Ma, Wei Zheng, and Fei Teng. "Feature Matching of Microsecond-Pulsed Magnetic Fields Combined with Fe3O4 Particles for Killing A375 Melanoma Cells." Biomolecules 14, no. 5 (April 26, 2024): 521. http://dx.doi.org/10.3390/biom14050521.

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The combination of magnetic fields and magnetic nanoparticles (MNPs) to kill cancer cells by magneto-mechanical force represents a novel therapy, offering advantages such as non-invasiveness, among others. Pulsed magnetic fields (PMFs) hold promise for application in this therapy due to advantages such as easily adjustable parameters; however, they suffer from the drawback of narrow pulse width. In order to fully exploit the potential of PMFs and MNPs in this therapy, while maximizing therapeutic efficacy within the constraints of the narrow pulse width, a feature-matching theory is proposed, encompassing the matching of three aspects: (1) MNP volume and critical volume of Brownian relaxation, (2) relaxation time and pulse width, and (3) MNP shape and the intermittence of PMF. In the theory, a microsecond-PMF generator was developed, and four kinds of MNPs were selected for in vitro cell experiments. The results demonstrate that the killing rate of the experimental group meeting the requirements of the theory is at least 18% higher than the control group. This validates the accuracy of our theory and provides valuable guidance for the further application of PMFs in this therapy.

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Shao, Tao, Cheng Zhang, Yang Yu, Zheng Niu, Hui Jiang, Jiayu Xu, Wenfeng Li, Ping Yan, and Yuanxiang Zhou. "Discharge characteristic of nanosecond-pulse DBD in atmospheric air using magnetic compression pulsed power generator." Vacuum 86, no. 7 (February 2012): 876–80. http://dx.doi.org/10.1016/j.vacuum.2011.03.022.

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Xu, Yun, Peichen Li, Chao Lu, Xiaolong He, Dake Li, and Yunchao Fang. "Waveform Control of Multi-Pulse Flat-Top High Magnetic Field Based on Pulsed Generator System." IEEE Transactions on Applied Superconductivity 30, no. 4 (June 2020): 1–5. http://dx.doi.org/10.1109/tasc.2020.2977008.

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Journal articles on the topic 'Magnetic pulse generator'

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