Magnetic bias weak light triggered high-power photoconductive switch

Abstract

The invention relates to the technical field of pulse power. The invention discloses a magnetic bias weak light triggered high-power photoconductive switch, which comprises a photoconductive switch, an insulating medium, an insulating container, a magnetic field generating element and a trigger laser, wherein the photoconductive switch is immersed in the insulating medium; the insulating medium isused for increasing the surface withstand voltage strength of the photoconductive switch; the photoconductive switch and the insulating medium are both arranged in the insulating container; the magnetic field generating element is arranged on the outer side of the insulating container; a magnetic field generated by the magnetic field generating element is perpendicular to an internal electric field of the photoconductive switch; and the trigger laser is used for controlling conduction of the photoconductive switch. Laser triggering is adopted, photoelectric isolation is realized between trigger control and high voltage; in addition, magnetic field bias is adopted to enable the electron multiplication direction in the photoconductive switch to deflect, so that the transverse sectional areaof carrier avalanche is increased, a current wire moves transversely, the current density of the current wire is reduced in an turning-on state, and the purpose of prolonging the service life of theweak light triggered high-power photoconductive switch is achieved.

Description

technical field [0001] The invention relates to the technical field of pulse power, in particular to a magnetically biased weak light triggering high-power photoconductive switch. Background technique [0002] The photoconductive switch is one of the key components of the pulsed power device, and its performance has an important influence on the performance of the pulsed power device. High-power photoconductive switches have the advantages of short closing time, small time jitter, high repetition frequency, photoelectric isolation, and large power capacity per unit volume, and have broad application prospects in the field of pulse power. However, the general high-power photoconductive switch needs a laser with high output light energy as the trigger light source, so the volume and weight are relatively large and the cost is high. Although the photoconductive switch working in the nonlinear mode can use a laser with a small volume and weight and low cost A high-power laser d...

AI Technical Summary

Problems solved by technology

However, the general high-power photoconductive switch needs a laser with high output light energy as the trigger light source, so the volume and weight are relatively large and the cost is high. Although the photoconductive switch working in the nonlinear mode can use a laser with a small volume and weight and low cost The high-power laser diode is used as the trigger light source, but the wire current discharge formed during the conduction process leads to a rather limited working life under high-power working conditions.

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