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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TL;DR: In this paper , the breakdown voltage of various dielectric media (air, water, rocks) while simultaneously supplying two pulses to the electrode system by two high voltage generators of different polarity was investigated.
Abstract:
The development of electric pulse technologies for the destruction of solids states (rocks) --- drilling, cutting and crushing requires reduction of high pulse voltages. In this work, for the first time, studies are proposed and carried out to determine the breakdown voltages of various dielectric media (air, water, rocks) while simultaneously supplying two pulses to the electrode system by two high voltage generators of different polarity --- positive and negative, which halves the operating impulse voltage each generator. In addition, experiments have shown that for all media there is a decrease in breakdown voltage in comparison with a monopolar voltage pulse, which reaches 28% --- for the breakdown of sandstone, 23% --- granite, 24% --- water, 25% --- air. A physical explanation of the discovered effect is given. Keywords: monopolar and bipolar pulse voltage, breakdown voltage, discharge channel.
TL;DR: In this paper , a self-powered gate drive circuit using the charging path of the Marx circuit was proposed to reduce the cost of a Marx circuit as a high-voltage power supply for nitrogen oxide decomposition for diesel vehicles.
Abstract: Reducing the cost of a Marx circuit as a high-voltage power supply for nitrogen oxide (NOx) decomposition for diesel vehicles is required. The Marx circuit with MOSFETs has an advantage in size compared to the Marx circuit with gap switches. However, the Marx circuit with MOSFETs needs gate drive circuits on the gate of each MOSFET. The gate signal and drive power must be supplied to each gate with isolation in a low-cost way. However, the transformer for the isolation with high withstand voltage, such as 10 kV or more, is typically high cost because of the low demand. This article proposes the self-powered gate drive circuit using the charging path of the Marx circuit. The proposed gate drive circuit only requires a low withstand voltage because the power for the MOSFET on the $n$ th stage is supplied from the ( $n -1$ )th stage via a low-voltage transformer. Besides, the gate signal is transmitted through pairs of LEDs and photodiodes instead of high-cost optical fibers. The proposed gate drive circuits are developed and implemented into a prototype of the Marx circuit with an output voltage of 4 kV. From the experiments, it is demonstrated that the proposed drive circuits provide both drive power and gate signal.
19 Mar 2023
TL;DR: In this paper , an improved version of the Marx bank circuit with auxiliary triggering topology (ATT) is proposed to improve the reliability of a positive nanosecond pulse generator with high amplitude, fast rise time and narrow pulse width.
Abstract: In plasma-jet-driven magneto-inertial fusion (PJMIF) systems, a high-voltage nanosecond pulsed power supply is required to drive the plasma gun. Marx bank circuit (MBC) is a good candidate to generate nanosecond pulse with high amplitude, fast rise time, narrow pulse width, and low jitter. However, the fundamental topology and operation principle of a positive nanosecond pulse generator are rarely discussed. In this paper, a comprehensive study on the conduction state of fundamental topology and traditional MBC is presented. Furthermore, an improved positive MBC with auxiliary triggering topology (ATT) is proposed. By changing the switching mode from “overvoltage switching-on” to “triggering switching-on”, the system reliability is improved. The output characteristics under different modified stages, triggering capacitors, and main capacitors are investigated. A $4 \times 4$ MBC prototype is implemented with optimized parameters to validate the feasibility of the proposed concept. With spark gap switch load, it can generate a high-voltage pulse with an amplitude of 5.04kV, a rise time of 12.4ns, and an FWHM of 12.6ns.
23 Oct 2002
TL;DR: In this paper, the fabrication and fundamental study of a repetitive nanosecond x-ray generator having a sealed field emission xray tube is described, where a compact Marx generator storing 12 Joules directly drives a field emission tube with voltage pulses > 380 kV and with < 4 nanoseccond risetime from an equivalent generator-impedance of 52 Ω.
Abstract: The fabrication and the fundamental study of a repetitive nanosecond x-ray generator having a sealed field emission x-ray tube is described. A compact Marx generator storing 12 Joules directly drives a field emission tube with voltage pulses > 380 kV and with < 4 nanosecond risetime from an equivalent generator-impedance of 52 Ω. A numerical model is used in which the x-ray tube's cathode width and anode-cathode gap (AK) spacing are permitted to change with time while electron flow between the cathode and anode is space-charge-limited (SCL) and nonrelativistic. Coupling this model to an equivalent circuit representation of the Marx generator, which includes the voltage variation of the BaTiO3 Marx capacitors, an estimation of the cathode current, anode-cathode potential and the x-ray spectrum was obtained and compared with measured values.
13 Jun 2005
TL;DR: In this article, the authors present a 1.25" radius circle embedded about 1 mm below the anode electrode surface, which allows for both H and D fields at the surface of the electrode to be measured at a single point, and preliminary discussions of breakdown are presented based on a number of open and short-circuited shots and a single shot 1" and 2" long, 1" diameter, Rexolite samples between the electrodes.
Abstract: The Nevada Shocker powered by nine 0.28 muF capacitors in a Marx Bank configuration yielding a maximum standup voltage and energy of 540 kV and 4.54 kJ respectively drives a 14.2 nF (in charging mode) Blumlein. The Blumlein with self-breaking water switch generates a 46 ns (theory) to 50 ns (experimental) pulse guided by a 7 Omega discharge transmission line to a parallel plate diode in a 10-6 Torr vacuum environment. Four novel UNLV dots equally spaced on a 1.25" radius circle embedded about 1 mm below the anode electrode surface interrogates the power flow between the diode plates. The novel dot allows for both H and D fields at the surface of the electrode to be measured at a single point. Preliminary discussions of breakdown will be presented based on a number of open and short-circuited shots and a number of single shot 1" and 2" long, 1" diameter, Rexolite samples between the electrodes. A null shot will also be presented for comparison.