SU365023A1 - - Google Patents

Description

PULSE HIGH-VOLTAGE GENERATOR

one

Known cascade impulse generators, working on the principle of ArkadievMarks. However, it is difficult for such generators to receive quasi-triangular pulses without using additional devices: cutting arresters, forming lines, etc.

In order to create a generator with an increased KPD, providing pulses of several units of microseconds, which have a quasi-triangular shape, a high-voltage pulsed generator is proposed, which is made in a cascade scheme, each stage of which contains an impulse transformer, a storage capacitor and a controlled discharge, moreover, pulse transformers contain two windings with an equal number of turns, one of which is included in the transformer circuit, and the other - in the autotransformer circuit, and the trans matornye winding all stages are connected in series, and each autotransformer winding having an additional outlet connected to the control electrode of the arrester of the next stage.

FIG. Figure 1 shows a schematic diagram of a three-stage generator of quasi-triangular voltage pulses. The number of steps can be unlimited.

The generator works as follows. Storage capacitors or capacitor banks / -3 are charged in parallel from one rectifier 4 through a charged

resistor 5 and obmotki pulse transformers (IT). Thus, the capacitor / is charged through the resistor 5 and the primary winding 9 of the first IT 6. The capacitor 2 is charged through the winding 9, 10, the electrode 11, the discharge current 12, the winding 13 and 14, etc. Thus, the capacitors of all capacitors are charged steps.

The discharge cycle of the circuit starts after the trigger pulse is applied to the controlled discharge / 5 of the first stage. The capacitor / is discharged through the primary winding 9 of IT 6. When the ignition voltage of the controlled discharge circuit 12 is ignited, the next step, determined by the number of turns of the winding 16, reaches the trigger threshold, a second step is assembled, assembled on IT 7, etc. .

As a result, at the output of the circuit, we obtain the voltage Exp., Defined by the formula:

v, x - G "-L zar (1)

where 71 is the circuit utilization factor,

n is the transformation ratio of one AND T, N is the number of generator steps, is the generator alternating voltage. When deriving formula (1), it is assumed that the generator steps are identical, i.e., the transformation ratios are equal to 5 bones, etc. In fact, to agree on the operation of the generator steps, the following condition must be met: for capacitor values of charge capacitors (2) . The condition (2) allows, having the same IT, to obtain a satisfactory pulse shape. FIG. Figure 2 shows the stylized current pulse at the cascade output, which can be obtained by appropriately setting the generator and switching it on to the accelerator tube. The duration of the current pulses is determined at the half amplitude level. The time ti corresponds to the start of the second stage of the generator, the moment N is the next nest stage. The driving impedance in the considered circuit in the process of forming the pulse is windings of the pulse transformers. Moreover, the windings, such as 14, connected in series, must be counted on the full pulsed operating current. The autotransformer windings perform two functions in the discharge stage: they disinfect the next-stage gadget and are a potential-spreading element, i.e., equalize the pulse potentials at the main electrodes of the gage. The current in the ignition circuits is controlled by resistors 17-19. The proposed cascade generator 40 can also operate at higher pulse frequency, since the windings of the pulse transformers in the charge stage can serve as charge chokes. Insulation between transformer and auto-transformer windings should be calculated for the magnitude of the charging voltage. FIG. 3 shows one of the possible constructive options for performing one 50 generator stage, where a 20 is a bushing insulator, through which the ends for feeding the next stage of the cascade are output; 21 - toroidal core; 22 - solid core insulation; 23 - secondary winding coils; 24 - main isolation of IT; 25 - volume 10 15th coil of the primary winding; 26 - high-voltage output capacitor; 27 - capacitor bank, lined up around the circumference; 28 —the outer insulating casing of the generator in the form of a pipe; 29 - the top electrode trigatron made in the form of a ring; 30 - bottom electrode of the discharge circuit grounded through the capacitor case; 31 - igniting electrode; 32 — capacitance designed to accommodate the load in the form of an accelerator partitioned tube; 33 is an inner insulating tube. The IT arrangement of the capacitor and the discharge is intended to reduce the parasitic inductance of the primary discharge circuit. The use of a ring design of a controlled discharge allows it to reduce its inductance and erosion of the electrodes. A pulse transformer with a primary winding in the form of a volumetric coil will have a small scattering inductance, which determines the pulse duration, and in the case of using the core and the main insulation of the enoxide compound as insulation, electrodynamic stability of the structure is achieved. The generator as a whole can be selected from modules of the type shown in FIG. 3, in which only the number of included capacitors changes. As a result of experimental verification of the generator cascade scheme on a model consisting of three stages, it can be argued that the scheme will work effectively to supply accelerator tubes for various purposes in the operating range from hundreds of kilovolts to several megavolts, durations of 1-10 microseconds and pore currents dca kiloampere The subject of the invention is a pulsed high-voltage generator, made in a cascade circuit, each stage of which contains a pulse transformer, a storage capacitor and a controlled discharge, characterized in that, in order to increase the efficiency, the pulse transformers each contain two windings with equal number d turns, one of which is connected by a transformer circuit, and the other by an autotransformer, with the transformer windings of all stages connected in series, and the autotransformer winding has an additional water, connected to the control electrode of the arrester next stage.

.L

Fig