SU792567A1 - Strong square-wave pulse generator - Google Patents

Description

The invention relates to a pulse technique and can be used as power sources for electron beam accelerators, gas lasers, etc. The generator of high voltage nanosecond pulses with voltage multiplication is known, containing two-step forming lines sequentially connected at the output with potential leads, the first stages of which are connected via chokes to a common controllable switch, and non-controllable switches connected between the potential Forming Line outputs Their levels are flj. A well-known generator has the disadvantage that the chokes, in addition to being designed for large voltages, have a negative effect on the shape of the output voltage. In addition, when forming forming lines on pulsed capacitors with insulating housings, it is necessary to ensure sufficient electrical strength of the insulation part relative to the supporting metal structures and shields according to the magnitude of the charging voltage. A known cascade rectangular pulse generator containing a power source, charging resistors, two-stage forming lines, the ends of which are connected in series, and started through nonlinear inductances connected to switches connected in series through capacitors 2 The disadvantage of the generator is its low reliability that insulation is under increased stress. A known generator of high-power high-voltage rectangular pulses, containing a power source, charging resistors, two-stage shaping lines, in series connected at the output, inductances, controlled dischargers connected to the first step of each two-step forming line, a supporting metal structure connected to the output of the first stages of the forming line in each stage of the generator h. The disadvantage of the generator is its low reliability of operation, since the insulation is located between the reference the metal structure C (the outputs of the second-stage capacitors of the forming line is under increased voltage — 1.5} -i (where and is the charging voltage), which leads to its premature breakdown.

The purpose of the invention is to increase the reliability of the generator by reducing the voltage applied to the insulation. The goal is achieved by the fact that in the generator of high-power high-voltage rectangular pulses containing a power source, two-stage forming lines, the outputs of which are connected in series, two chains of charging elements connecting the forming lines with the power supply NIN, controlled switches, each of which are connected to the input of a step of forming lines, controlled switches and supporting metal structures are connected to different steps of each forming line.

FIG. 1 shows the basic electrical circuit of the generator; in fig. 2 shows the placement of the two-step forming line on the supporting metalwork.

The generator contains a power source 1, for example, unipolar, charging elements 2, two-stage forming lines made on capacitors 3 and inductance coils 4, controlled switches 5, supporting metal structures 6, load 7. Insulation 8 of each generator stage is located between the reference metal structure b and the terminals of the capacitors 3 The supporting metal structures 6 of each floor are located on the insulators 9 (Fig. 2).

The pulse generator works as follows.

After charging from the power source 1 through the charging elements 2 of the capacitors 3 of the forming lines to the voltage, for example + Uj, the switches 5 are triggered. By the second stage of each forming line, the voltage wave with amplitude -Uj begins to propagate to the side of load 7. The potentials of the plates 10, 11, 12 of the capacitors 3 become equal, respectively, + U3, + U - ,,, 0.

When load 7 is reached, a voltage wave with an amplitude of -0.5 Uj refracts to the first step of the line, and a wave with an amplitude of -0.5 Uj reflects to the second step of the forming line.

At the moment when the wave reaches the load 7, the potential l of the plates 10, 11, 12 at the output of the forming line becomes equal, respectively, +0.5 Uo, O. At the same moment, the potentials of the plates 10, 11, 12 at the input of the forming line change their potential and become equal to +0.5 and ,, +0.5 Uj -0.5 Uj. After reaching the short start of the second stage, the wave

reflects with an amplitude of +0.5 and, and from the open beginning of the first stage, the wave is reflected with an amplitude of -0.5 U. The potentials of the plates 10, 11, 12 of the two-step forming line become +0.5 and ", +0.5 Uj ,

+0.5 U-J, i.e., the capacitors of the three stages are discharged.

Thus, the potential difference between the terminals of the capacitors 3 and the supporting metal structures b applied to the insulation does not exceed Uj. The implementation of the generator according to the proposed scheme makes it possible to reduce the maximum value of the voltage applied to the insulation, which ensures

saving insulating material and increases the reliability of the generator.

Claims (3)

Invention Formula A generator of high-power high-voltage rectangular pulses containing a power source, two-step forming lines, the outputs of which are connected in series, two chains charging elements connecting the forming lines to the power source, controllable switches, each of which is connected to the input of a stage of fioming lines, characterized in that, in order to increase the reliability of the generator by reducing the voltage applied to the insulation, the controlled switches and supporting metal structures are connected to different steps of each forming line. Information sources, taken into account in the examination 1 USSR Author's Certificate No. 443310, cl. H 03 K 3/53, 1974. 2. USSR author's certificate number 445131, cl. H 03 K 3/53, 1974. 3. USSR author's certificate for application number 2642101, cl. H 03 K 3/53, 1979. " vt jl-rvt u jl fO Tjt