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Rise time

About: Rise time is a research topic. Over the lifetime, 4748 publications have been published within this topic receiving 47512 citations.


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Journal ArticleDOI
TL;DR: In this paper, a specific method is proposed to optimize the design of both high voltage (HV) and low voltage (LV) windings, to reach the best rise time and overshoot performance.
Abstract: High voltage and high frequency pulses are widely used in industrial applications such as klystron modules, radar application, plasma technology, and so on. Transforming such a pulse with magnitude of thousands volt requires special transformers. Considering its frequency requirements which vary from hundreds to thousands Hertz, effects of parasitic capacitance may change the expected results. In this paper a specific method is proposed to optimize the design of both high voltage (HV) and low voltage (LV) windings, to reach the best rise time and overshoot performance. This method is based on both calculations of equivalent circuit and finite element analysis (FEA). Among the various topologies represented in the literatures, cone winding type pulse transformer is selected in which by changing its windings angle, it can be modified to parallel winding type. Initially analytical study in pulse transformer rise time equivalent circuit is performed to find the best cone angle between the windings and also the best distance between the bottom of windings to reach the optimum output parameters of pulse transformer such as fast rise time and minimum overshoot. In this analysis the lumped parameters of the equivalent circuit are calculated based on the stored energy between the windings. Afterwards sensitivity of the response to the load and source parameters variations is calculated in order to find the best distance and the angle between the windings. In the meantime, the distributed parasitic capacitances are extracted by using FEA to exert as circuit elements, in the electromagnetic model of pulse transformer. Finally a transient analysis is executed on the pulse transformer model containing distributed capacitances. The results of this analysis prove that the winding design using the distributed elements effects shows good results considering pulse shape.

25 citations

Proceedings ArticleDOI
30 Jun 2002
TL;DR: In this paper, the effect of pulsed electric fields (PEF) with pulses, which are of the order of the charging time of bacterial membranes, was studied for the viability of bacillus subtilis (ATCC6051) in its vegetative state.
Abstract: In order to explore the effect of pulsed electric fields (PEF) with pulses, which are of the order of the charging time of bacterial membranes, we have studied the effect of 45 ns pulses on the viability of bacillus subtilis (ATCC6051) in its vegetative state. The treatment chamber consists of two parallel metal plates with the separation of 2.2 mm and an insulating housing, made of PTFE. A 30 /spl Omega/ Blumlein generator with a low inductance spark gap switch delivers square wave voltage pulses of 45 ns duration to the electrodes of the bacterial treatment chamber. The parameters varied for this study were the resistivity of the medium and the risetime of the pulse. PEF was found to be more effective in media with low resistivity. The risetime, which was varied from 2 ns (f<200 MHz) to 20 ns (f<50 MHz), determines the high frequency components in the Fourier spectrum of the pulse. With pulses of different rise time, but same total energy, the pulse with short rise time kills bacteria more effectively. These results indicate that the high frequency components in PEF deposit the electrical energy in the cell and affect intracellular structures.

25 citations

Journal ArticleDOI
TL;DR: Over 1/4-joule per pulse is obtained from a cable-fed uv preionized discharge device where a faster energy deposition rate compensates for a slower voltage rise time.
Abstract: Over 1/4‐joule per pulse is obtained from a cable‐fed uv preionized discharge device where a faster energy deposition rate compensates for a slower voltage rise time. These slower voltage rise‐time devices may be scalable to high repetition rates using conventional thyratron switching techniques.

25 citations

Journal ArticleDOI
TL;DR: In this article, a high bandwidth measurement of the transient inter-subband photocurrent of a GaAs/AlGaAs multiple quantum-well infrared photodetector (QWIP) was performed.
Abstract: We report on a high bandwidth measurement of the transient intersubband photocurrent of a GaAs/AlGaAs multiple quantum-well infrared photodetector (QWIP). The photocurrent is excited via tunable subpicosecond infrared pulses. The response time of the detector has a full width at half-maximum of 18.5 ps and a rise time of 14.5 ps, which is limited by the electrical circuit. The decay time of the photocurrent response exhibits a significant dependence on the applied voltage, with increasing decay times for increasing bias voltages. From the experimental data, we conclude that the intrinsic response time of a QWIP is less than 7 ps.

25 citations

Proceedings ArticleDOI
30 Sep 2008
TL;DR: PID settings are optimized in real time by using genetic algorithm and are compared with generally accepted quality indicators for control systems like rise time, % overshoot and settling time of step response or such coefficient.
Abstract: In this paper we uses a software pack, which allows to adjust PID controller automatically in real time way in the case of changes parameters of used object. PID settings are optimized in real time by using genetic algorithm and are compared with generally accepted quality indicators for control systems like rise time, % overshoot and settling time of step response or such coefficient like oscillations frequency, reduced damping and gain of second order object. A digital signal processor (DSP) is a specialized microprocessor designed specifically for digital signal processing generally in real time applications requiring high computation. The simulation results were verified by some laboratory test.

25 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202330
202264
2021111
2020146
2019157
2018147