Full-solid-state high-voltage pulse current source with unipolar pulse output

Abstract

The invention belongs to the field of power supply technologies, and particularly relates to a full-solid-state high-voltage pulse current source with unipolar pulse output. The full-solid-state high-voltage pulse current source with unipolar pulse output is composed of basic discharge units which are connected in series, a current in a load can be maintained to be constant by using inductors and high voltage diodes, and a voltage of the load is determined by load characteristics and parameters of an inductance current simultaneously. The current source will not be influenced by conditions of short circuit of the load when the current source is used for a pulse voltage-resistance test, and the current source can effectively supply a stable pulse current when the current source is used for testing the voltage resistance of a voltage-sensitive device.

Description

technical field [0001] The invention belongs to the technical field of power supplies, and in particular relates to an all-solid-state high-voltage pulse current source with unipolar pulse output. Background technique [0002] With the development of pulse power technology, the application of high-voltage pulse current source is becoming more and more extensive. In addition to conventional laser pumping, ion implantation material modification, EDM, switch electrode aging and gas discharge related applications, some high-voltage The research on pulse characteristics of devices has also attracted extensive attention, such as materials and pulse withstand voltage characteristics of devices. At present, most devices for testing withstand voltage are mainly DC high-voltage power supplies. When it comes to impulse withstand voltage, impulse voltage generators are often used as high-voltage generating devices. [0003] Conventional power electronics technology mainly adopts the me...

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Problems solved by technology

[0003] Conventional power electronics technology mainly adopts the method of inductance combined with a circuit breaker to obtain pulse current. On the one hand, because the existing circuit breaker is usually a low-voltage device, pulse overvoltage is often generated when the current is disconnected. When the amplitude of the overvoltage exceeds the switch When the withstand voltage of the device is lower than the withstand voltage value of the device, the switch device is prone to breakdown and damage, so the conventional pulse current source circuit breaker needs to be added with an overvoltage protection or a peak voltage absorbing circuit; on the other hand, due to the low withstand voltage of the power system, it is difficult to It is used in occasions that require both high voltage and pulse current, and the high voltage circuit breaker is not yet mature, and the stability is not enough, and the service life is limited

The impulse voltage generator used in high-voltage occasions adopts a Marx structure. The entire device is composed of a capacitor, an isolation resistor (or inductance) and a spark gap. The generated pulse voltage waveform is difficult to control, the amplitude is difficult to adjust, and the output current is uncontrollable. It is difficult to meet the requirements in test occasions. For example, in the test of high-voltage varistors, both high voltage and relatively constant output current are often required.

A typical high-voltage pulse current source often needs a circuit breaker to realize, but the current high-voltage circuit breaker has the disadvantages of unstable operation and short life, and it is difficult to obtain better output results, which affects the test results.

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