The generator high-voltage nanosecond pulses

 

The invention relates to the field of high-current high-voltage electronics and can be used, for example, for pumping lasers on self-terminating transitions. Technical result achieved - getting high-voltage nanosecond pulses with a repetition rate of 20 kHz and stable parameters. The generator high-voltage nanosecond pulses consists of a modulator with a full discharge of the energy storage, which is used as a hydrogen thyratron, and a long peaking gas discharge tube, placed in a metal shield and forming with the screen of the coaxial system with impedance equal to the impedance of the load, whereby the said tube connected between the energy storage and load. 2 Il.

The invention relates to the field of high-current high-voltage electronics, in particular for generating pulses of high-power nanosecond duration, for example, for pumping lasers on self-terminating transitions, to increase resolution radar systems, etc.,

The formation of high-voltage nanosecond pulses is difficult thespontaneous:

generators drums magnetic lines [1];

generators for gas discharge devices [2, 3].

In the first case uses a magnetic effect of the compression energy in the transformer is made on a ferrite ring. Such generators have a high stability of output parameters, but a low pulse repetition frequency (200 Hz), which is connected with a great time alternating magnetization of the ferrite. Such systems have considerable weight and size.

In the second case is used to transfer the stored energy through the discharge unit to the load. To obtain pulses of nanosecond duration with the cutting edge up to 5 NS as the switching devices, in most cases, using managed or unmanaged arresters in medium and high pressure devices pseudospark discharge. The pulses obtained in such systems, have low stability and low repetition frequency, which is connected with processes in gas discharge plasma. In addition, in such systems it is impossible to achieve good matching of the generator to the load, resulting in reduced efficiency and additional load on the generator.

World is using wave ionization [4]. When moving from one electrode to the other in front of a wave of ionization occurs exacerbation of the gradient of the potential, which allows you to get at the system output pulses with a keen cutting edge. However, a precondition for the increase of the output pulse is an application to one of the electrodes is a pulse voltage with an amplitude of tens or hundreds of kilovolts and a high slew rate of the voltage in the front, which poses serious problems of formation of such impulses.

The technical challenge is to obtain high-voltage nanosecond pulses with a repetition rate of 20 kHz and stable parameters.

The technical result is achieved by pre-forming pulse voltage in the circuit of the modulator with the full discharge of the energy storage as a key which uses the thyratron, and the further aggravation of the pulse front in a long, aggravating a gas discharge tube, placed in a metal screen. Necessary for the achievement of the technical result is matching the load impedance with the characteristic impedance of the coaxial metal screen - long aggravating discharge the slow and fast waves of ionization, the propagation speed which can reach 1/3 the speed of light in vacuum. The higher the amplitude of the applied voltage and the speed of its rise, the greater the velocity of propagation of waves of ionization and more severe exacerbation output pulse.

Modulators, in which the key used thyratrons, provide pulses with a duration of the leading edge lying in the range 15-100 NS. Submission of such a pulse to one of the electrodes of a long tube leads to the formation of slow waves of ionization with a slight aggravation of the output pulse.

For more severe exacerbations output pulse serves to place long sharpening tube in a metal screen, which, together with a long tube forms a coaxial system with impedance equal to the load resistance.

Studies [5] showed that the maximum intensification of the voltage pulse occurs at a distance of not less than 6 diameters of the tube, and the maximum velocity of wave propagation and minimal loss of power when the gas pressure in the tube, corresponding to the minimum voltage of occurrence of discharge at a constant current. This criterion and agreed long about what tritle impulses.

Block diagram of the generator of nanosecond pulses and timing diagrams explaining his work, shown in Fig.1 and Fig.2.

The thyratron 1 (Fig.1) included in the scheme of the linear modulator with full discharge of the energy storage. For charging the energy storage device 2 uses a source of high voltage 3 and the charging diode VD1. The launch of the thyratron is from pedodontia 4. Parallel charging diode connected long peaking gas discharge tube 5 (in the experiment with a diameter of 30 mm and length of 400 mm interelectrode distance of 360 mm and the load R. In the quality of the working environment was used argon with a pressure of 500 PA. To align with the load R the discharge tube is placed in a metal shield 6.

The use of the generator high-voltage nanosecond pulses provides in comparison with existing devices:

- faster load connection to a power source and, consequently, increase efficiency,

- increasing the pulse repetition rate,

- reducing instability temporal characteristics.

Literature

1. Kataev, I., Impact of electromagnetic waves. M: Owls. radio. 1968. 151 C.

2. Kiselev, Y. C., B. N. Cherepanov Spark arrestors. M: the h I. M Waves of electrical breakdown in a bounded plasma. M.: Nauka, 1989. S. 131.

5. Yudaev Y. A. Waves of ionization and their use for control of high-speed gas-discharge switches: author. dis ... Kida. technology. Sciences. Ryazan: RGRTA. 1994. 16 C.

Claims

The generator high-voltage nanosecond pulses, consisting of a modulator with a full discharge of the energy storage as a key element which uses a hydrogen thyratron, and a long peaking gas discharge tube, placed in a metal shield and forming with the screen of the coaxial system with impedance equal to the load resistance connected in parallel to the charging diode and the load, characterized in that the long aggravating tube connected between the energy storage and load.

 

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