Pulse power supply based on avalanche transistor Marx generator and LTD circuit

Abstract

The invention discloses a pulse power supply based on an avalanche transistor Marx generator and an LTD circuit. The pulse power supply comprises M stages of LTD circuits comprising m partitions, wherein each partition comprises N stages of Marx circuits, each stage of Marx circuit comprises n avalanche transistors connected in series, a trigger unit is connected with a trigger input end of each stage of LTD circuit, and a high-voltage DC power supply 1 is connected with a charging loop of each stage of LTD circuit. The secondary side of the M-stage LTD circuit outputs high-voltage nanosecond pulses in series. According to the invention, by adopting the M-stage LTD circuit with m partitions, the output end of the Marx circuit of each partition is connected with the primary side of the LTD circuit of each stage, wherein the M-stage LTDs are connected to the secondary side in series to output high-voltage nanosecond pulses with the fast leading edge repetition frequency, and the output voltage of n avalanche tubes is greatly increased than that of single-stage Marx circuit of single-avalanche tube. In addition, the two ends of each avalanche transistor are connected in parallel with the voltage-sharing resistors with large resistance values for voltage sharing, so that uneven voltage division of the avalanche transistors is prevented, the output pulse is stable and efficient in voltage and current, and the conduction state of the avalanche transistors in each partition Marx circuit is greatly improved.

Description

technical field [0001] The invention belongs to the field of pulse power and discharge plasma, in particular to a pulse power supply based on an avalanche tube Marx generator and an LTD circuit. Background technique [0002] Pulse power technology is an electrophysical technology that stores energy at a lower power for a longer period of time, and then converts it into pulsed electromagnetic energy with several times the power in a short period of time. The purpose of pulse high voltage and high current. [0003] Atmospheric pressure plasma, as a special low-temperature plasma, has received extensive attention. In most cases, people use AC source, DC source, microwave source, etc. to generate atmospheric pressure plasma, but the temperature of atmospheric pressure plasma generated by these methods is too high, which limits its application in biomedicine and material processing. The atmospheric pressure plasma excited by the repetitive frequency pulse source has significant...

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Problems solved by technology

However, the insulation requirements of the Marx generator are high, and the output efficiency will drop rapidly when the number of stages increases, and the current flow capacity is limited by a single switching device

The LTD circuit with stronger flow capacity also has the following problems. The normal working withstand voltage of a single avalanche tube is only about 300V. If only the LTD circuit based on the avalanche tube is used, it is necessary to obtain the required LTD for high output voltage There are too many stages in the circuit, which brings great difficulties to the driving and synchronization of the circuit, which seriously restricts its application scenarios

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