Topic
Marx generator
About: Marx generator is a research topic. Over the lifetime, 1276 publications have been published within this topic receiving 8970 citations.
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05 Oct 2020
TL;DR: In this article, a 5-stage Marx generator with avalanche transistors is simulated with a high-performance CAD tool (ADS) which has several circuit optimization tools, which will allow to improve said Marx generator.
Abstract: The effect of short duration pulses is still of interest to researchers as one of the least invasive techniques in different medical treatments, for example: cancer. Marx pulse generators are the most widely used because they are very compact circuits and modular scalability. There are still many problems regarding coupling and parasitic elements that have not been solved since there are no analytical expressions that allow determining the duration and amplitude of the pulse with high precision, in addition to reducing the duration of the pulse and increasing the pulse rate pulse peak value. All of the above allowed a preliminary study of a 5-stage Marx circuit module with avalanche transistors (FMMT417) with a high-performance CAD tool (ADS) which has several circuit optimization tools, which will allow to improve said Marx module. As a result of the first simulation, it was possible to successfully simulate the 5-stage Marx generator with an estimated pulse duration of 1100 V and estimated pulse duration of 7 ns.
26 Aug 2019
TL;DR: In this article, experiments were conducted to simulate and generate oscillating voltage impulses as well as to measure the breakdown voltage on a rod-rod electrode configuration with different air gaps and frequencies.
Abstract: This paper reports about the experiments to simulate and generate oscillating voltage impulses as well as to measure such voltage impulses. In the first part, the tower of overhead lines will be modelled in an EMTP program. The voltage across the insulator string with a length of 300 cm will be simulated by applying a lightning current impulse into the tower. As the next part, the Marx generator will be modified to generate a standard lightning impulse voltage with a superimposition of oscillations. In order to generate such impulses, the damping resistors of the Marx generator have to be replaced by a set of inductors and resistors in series. The third part deals with the measurement of the breakdown voltage on a rod-rod electrode configuration with different air gaps and frequencies. A cumulative distribution function of the breakdown voltage and the voltage-time curve will be extracted for each case. As the last step, the measurement results will be compared with the breakdown characteristic of the standard lightning impulse voltage: The higher the frequency of the oscillation, the voltage-time curves comes nearer to the standard impulse voltage, which is caused by a higher damping at higher frequencies. Moreover, an oscillated lightning impulse voltage has a higher crest value of the breakdown voltage in comparison to the standard lightning impulse voltage, because of the overshoot of the voltage shape.
14 Sep 2020
TL;DR: In this article, a method for generating a powerful rectangular pulse at an active load without an additional step of energy compression in the form of a traditional forming line is considered, based on the operation of the Marx generator of a coaxial design in the intermediate inductive storage mode.
Abstract: A method for generating a powerful rectangular pulse at an active load without an additional step of energy compression in the form of a traditional forming line is considered. The method is based on the operation of the Marx generator of a coaxial design in the intermediate inductive storage mode. An analysis of the operation of the circuit is made. It is shown that the inductances Ls and the capacitance of the Cs steps relative to the conductive screen distributed over the steps of the Marx generator form a forming line, the energy of which, when using a current chopper, is stored in the circuit inductance. As a result, an impulse of duration $\tau\cong$ 2N·(Ls·CS)1/2 , where $N$ is the number of stages of the Marx generator, is formed on the active load (e-beam diode). The results of calculations and test experiments during the operation of the Marx generator located in a conducting screen with a current chopper based on an electric explosion of conductors (EEC) are presented.
15 May 2019
TL;DR: In this paper, the design and simulation of circuit for hipot testing of cables is reported, the circuit essentially comprises of Pulse Forming Network (PFN) based Marx Generator, which basically generates a high voltage pulse from a low voltage DC supply.
Abstract: The Hi-pot test is carried out on transmission line cables for checking insulation condition. In this paper, the design and simulation of circuit for hipot testing of cables is reported. The circuit essentially comprises of Pulse Forming Network (PFN) based Marx Generator. Marx Generator basically generates a high voltage pulse from a low voltage DC supply. The Pulse Forming Network (PFN) is used to store the exact amount voltage required for hipot testing. The pulse parameters in PFN circuit can be varied and controlled by altering the PFN and the load connected to the PFN. For simulation purpose P-Spice software is being used. Simulation results are obtained for 20 kV charging voltage, 30kV max pulse voltage with 5µs pulse-width. Single stage and multi stage of PFN based Marx generator required for Hi-pot testing are simulated and discussed. Hardware implementation of scaled down circuit is done and satisfactory results are obtained.
TL;DR: In this paper, a new type of SF6 spark gap switch was developed for the Marx generator, which was successfully tested as an insulator of the generator for the first case.
Abstract: Technological troubles and new approaches in a pulse-power machine : LIMAYI as a relativistic electron and light ion beam generator are reported. Liquid Fron-113 is successfully tested as insulator of the Marx generator for the first case. We develop a new type of a SF6 spark gap switch for the Marx generator.