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1
Content available remote

Electronically Tunable Quadrature Oscillator Employing Single Differential Difference Transconductance Amplifier

100%
Yesil A., Konal M., Kacar F.
Acta Physica Polonica A
|
2017
|
vol. 132
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issue 3
843-845
EN
In this paper, we present new voltage mode quadrature oscillator, employing single differential difference transconductance amplifier. The proposed oscillator structure consists of two grounded capacitors and a single resistor. The use of grounded capacitors is particularly attractive for integrated circuit implementation. In this way, the frequency of oscillations can be controlled by the biasing current of transconductance stage. Simulation results agree quite well with the theoretical analysis.
2
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Quadrature Oscillator Design with G_{m}-C Structure

100%
Konal M., Yeşıl A., Kaçar F.
Acta Physica Polonica A
|
2017
|
vol. 132
|
issue 3
1013-1015
EN
This paper presents an attractive and new quadrature oscillator based on G_{m}-C structure. The proposed quadrature oscillator is achieved with MOS transistors and two capacitors. The passive capacitors are grounded, which is an advantage for integrated circuit implementation. The theoretical results are verified by LTSPICE simulation using the 0.18 μm CMOS technology from TSMC. The proposed quadrature oscillator circuit can be used in several communication and instrumentation systems.
3
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Dynistor Switches for Micro- and Nanosecond Power Pulse Generators

80%
Aristov Y., Grekhov I., Korotkov S., Lyublinsky A.
Acta Physica Polonica A
|
2009
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vol. 115
|
issue 6
1031-1033
EN
Gigawatt power switches for microsecond range applications based on an assembly of Reverse Switch-on Dynistors (RSD) and fast compact generators for nanosecond range applications based on new semiconductor devices Deep Level Dynistors (DLD) are discussed. As an example design and operation principles of 25 kV, 300 kA, 600 μs pulse duration power switch based on 76 mm diameter RSDs and 25 kV, 10 kA switch based on 16 mm diameter DLDs are described. It is possible to increase the pulse power by increasing both diameter of dynistor structure and number of devices connected in series or in parallel.
4
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A Tesla Transformer and a Coaxial Peaking Switch as a UWB Pulse Source

80%
Amal Y., Pecastaing L., Rivaletto M., Reess T., Pignolet P., Cassany B., Ferron A., Courtois L., Merle E.
Acta Physica Polonica A
|
2009
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vol. 115
|
issue 6
1115-1117
EN
This paper presents a high voltage pulse source which is able to generate ultra wideband (UWB) pulses during about 1 ns through a 16 antennas array. This UWB source is composed of a 50 kV DC voltage supply, a Tesla transformer to amplify this voltage up to 400 kV, a gaseous pressurized peaking switch and an impedance transformer (50 Ω → 3.125 Ω). This output impedance value corresponds to the input impedance value of a sixteen 50 Ω antennas array. That is why a distributor is needed in order to feed the antenna array. In this paper, the peaking switch and the capacitive line divider used to characterise the generated pulses are particularly described. The peaking switch is based on the principle of a line discharge by means of a high pressure gas switch. It is loaded with a Tesla transformer to obtain a good pulse reproducibility. The main characteristics of the output pulse waveform (amplitude and rise time) are linked to the properties of the gas switch and particularly to the gap distance, the pressure and the nature of the gas used in the switch filling. The aim is to find a good compromise between various parameters as the output pulse amplitude, the rise time and the repetition rate in order to ensure a better efficiency of the UWB source. Classical voltage measurement techniques do not allow us an estimation of the main characteristics of such an output signal. Therefore a voltage probe was designed and realised to measure both the amplitude and the rise time of the pulses delivered by the generator. This device is based on the principle of a capacitive line divider. Calibration tests (transient and frequency tests) were performed and show that the high cut-off frequency, around 2.5 GHz, is consistent with the transient response of the output high voltage waveform. The design, realisation and calibration tests are also presented.
5
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Development of a Pulsed High Current Facility for Accelerating Metal Foils for Hydrodynamic Materials Testing

80%
Graneau N., Omar K.
Acta Physica Polonica A
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2009
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vol. 115
|
issue 6
1086-1088
EN
A new pulsed power machine to be called AMPERE is currently under development at AWE. Its initial use will be as a metallic foil accelerator for the specific purpose of applying large impulses (>300 Pa s) and pressures (>450 G Pa) to a target for material property testing. The critical circuit features are described and a computer model has been written to predict the expected machine performance. Future uses of this facility for driving further hydrodynamic experimentation are also discussed.
6
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Development of a Fast Marx Generator for High Power Ultra Wideband Pulse Radiation

80%
Cadilhon B., Pecastaing L., Reess T., de Ferron A., Pignolet P., Brasile J., Andrieu J., Vauchamp S., Bertrand V., Lalande M.
Acta Physica Polonica A
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2009
|
vol. 115
|
issue 6
1084-1085
EN
We present in this paper the design and realisation of two autonomous, ultra wideband radiation sources consisting of a high gain broadband antenna driven by two subnanosecond pulsed power sources. Each one is made of a Marx generator and a pulse forming device based on the use of gaseous spark gap. The main pulsed source is a ten stage subnanosecond Marx generator which delivers pulses in the range of 250 kV/1.5 J, with a 300 ps rise time, subnanosecond pulse duration at a pulse repetition frequency of 350 Hz. The antenna combined with the pulsed source is a travelling wave antenna called Valentine antenna. Some mechanical modifications were made to improve the dielectric strength of this radiation element. A 3D model of the antenna, on a time domain electromagnetic software, was first performed to study the influence of these modifications on the main radiating characteristics of the antenna. Its high gain and its capability to radiate short pulses without dispersion allow us to achieve a high measured figure of merit.
7
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Development of 60 kV, 300 A, 3 kHz Pulsed Power Modulator for Wide Applications

80%
Ryoo H., Jang S., Goussev G., Rim G.
Acta Physica Polonica A
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2009
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vol. 115
|
issue 6
967-970
EN
In this paper, a novel pulsed power generator based on IGBT stacks is proposed for wide pulsed power applications. Because it can generate high voltage pulsed output without any step-up transformer or pulse forming network, it has advantages of fast rising time, easiness of pulse width variation, high repetition rate and rectangular pulse shapes. Proposed scheme consists of multiple power stages which were charged parallel from series resonant power inverter. Depending on the number of power stages it can increase maximum voltage up to 60 kV or higher with no limits of power stages. To reduce component for gate power supply, a simple and robust gate drive circuit which delivers gate power and gate signal simultaneously by way of one high voltage cable is proposed. For gating signal and power a full bridge inverter and pulse transformer generates on-off signals of IGBT gating with gate power simultaneously and it has very good characteristics of protection of IGBT switches over arcing condition. It can be used for various kinds of pulse power application such as plasma source ion implantation, sterilization, water and gas treatment which requires few kHz pulse repetition rate with few to ten of microseconds pulse width.
8
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Study of an Ultra-Compact, Repetitive Marx Generator for High-Power Microwave Applications

80%
Bischoff R., Charon R., Duperoux J., Martin B., Pinguet S.
Acta Physica Polonica A
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2009
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vol. 115
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issue 6
964-966
EN
The need for repetitive high-power microwave systems, for instance within the scope of convoy protection, requires the availability of compact, repetitive pulsed-power generators. The development and the first experimental results of an upgraded balanced ISL Marx generator for future repetitive operations at pulse repetition frequencies in the order of 100 Hz are introduced. A key objective is to keep the fundamental modular coaxial concept by reason of its scalability and compactness. Simulation models were developed under the PSpice software package in order to investigate the charging and discharging phases of the Marx generator and also to determine the design criteria for repetitive operations. The charging resistors were replaced by ultracompact inductors for rapid charging, being able to withstand pulsed voltages up to 60 kV and pulsed currents up to 1.4 kA during the discharge phase. An improved type of strontium-titanate high-voltage ceramic capacitor was successfully tested experimentally up to 70 kV. Each new elementary stage of the Marx generator consists of eight 1.1 nF sectors of a cylinder capacitors mounted in parallel, two charging inductors of about 17.8 μH and two halves of spherical spark gaps. The pressurized self-triggered gas switches are arranged along the axis for fast consecutive breakdown thanks to the UV radiation emitted during the breakdown in each gap. The stages are installed in individual fibreglass housings. First experimental results of a 4-stage Marx generator in repetitive operation, driven by a 4 kW capacitor charging power supply up to a maximum voltage of 40 kV, are presented.
9
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Experimental Studies on Charging Operation of a Compact Repetitive Tesla Transformer

80%
Zhang Z., Zhang J., Yang H., Qian B., Meng Z., Li D., Wang S., Cao Y., Zhou W.
Acta Physica Polonica A
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2009
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vol. 115
|
issue 6
973-975
EN
Charging operations of a compact Tesla transformer were experimentally investigated, in single-shot and rep-rate (50 pps for 1 s) modes, respectively. The charging limitations were also explored. The experimental results were compared and analyzed. The maximum secondary charging voltages of the Tesla transformer were measured to be 380 kV and 300 kV in single-shot and rep-rate modes, respectively. The RMS pulse-to-pulse instability of the secondary charging voltage is generally less than 10% but increases with the increasing initial voltage across the primary capacitor. Since the secondary capacitor of the Tesla transformer is a pulse forming line (PFL), continued operation is possible if there is breakdown in the PFL. Furthermore, operation can even be continued under occasional breakdown for some pulses, without the effects on the operations of subsequent pulses.
10
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An Improvement of Magnetic Flux Linkage in Electrical Generator using the novel Permanent Magnet Arrangement

61%
Sriwannarat W., Khunkitti P., Janon A., Siritaratiwat A.
Acta Physica Polonica A
|
2018
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vol. 133
|
issue 3
642-644
EN
The partitioned stator permanent magnet generator (PS-PMG) has been extensively used as electrical generator due mainly to their high flux linkage, high electromotive force EMF) and high efficiency, especially the PM arrangement of the PS-PMG is an important factor to improve the performance of the generator. Therefore, we propose the novel permanent magnet PM) arrangement of the PS-PMG by using the dual rotor with coaxial core structure in order to improve the flux linkage and the EMF of PS-PMG. The PM position of stators of the conventional PS-PMG was rearranged, then the electrical characteristic of the proposed structure was characterized through the simulations based on finite element method. It was found that the flux linkage produced by the proposed structure is 37.06% higher than that of the conventional PS-PMG existed in the literatures because the area for induced flux linkage is significantly increased. This flux linkage enhancement further causes an increment of EMF about 34.95% compared to that of the conventional PS-PMG under the same condition. Especially, the EMF produced by the proposed structure is classified in the high-value range regarding the PM generator. Then, the PS-PMG using novel permanent magnet arrangement could be another remarkable choice for the electrical generator application
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