SU566321A1 - Cascade generator of high-voltage pulses - Google Patents

Description

one

The invention relates to high voltage technology. X voltages, and more specifically to cascade high voltage pulse generators, and can be used as a source of accelerating voltage in compact X-rays, electronic and other pulsed ionizing radiation apparatus, in laser technology and in various physical installations. .

A cascade high voltage pulse generator is known, which forms meek voltage pulses with an amplitude of hundreds of kilovolts and contains a primary winding consisting of several turns of copper tape and a secondary winding made by two copper strings spiraled onto a ferrite core. The secondary winding simultaneously performs the functions of a storage tank. The energy stored in this capacitor is realized in the primary winding of the combined transformer when the primary current switch II is triggered.

However, such a cascade pulse generator has an insufficient amplitude of output pulses.

Of the known devices /, the closest in technical essence to the invention is a cascade high-voltage pulse generator containing a power source, combined pulse transformers connected in series through isolating resistors, a coupling capacitor and three-electrode current switches connected in parallel to the input of each pulse transformer 2

Claims (2)

The disadvantage of such a pulsed cascade generator is that the primary switches do not operate as a result of a statistical variation in the development time of the discharge from the moment of ignition to the closure of the working gap. Therefore, the voltage pulses in the secondary windings are not generated simultaneously and the voltage at the output of the generator is less than the sum of the amplitudes of the pulses included in the transformer circuit. To increase the amplitude of high voltage output pulses in a cascade pulse generator, a high voltage containing a power source, combined pulse transformers connected in series through isolating resistors, a coupling capacitor and three-electrode current switches connected in parallel to the output of each pulse transformer, controlled by electric dy switchboards, starting from the second, are connected to the beginning of the secondary winding of the pulse transformer of the previous stage through condensate p communication. In the drawing, a principle electric circuit of a cascade pulse generator / HIGH voltage (for example, with a cascade number n 3) is given. A high-voltage cascade pulse generator consists of three series-connected combined pulse transformers 1-1, 1-2, 1-3s with three-electrode switches 2-1.2-2, 2-3 in the primary winding circuit 3-1, 3-2 3-3. On the ferrite cores 4-1, 4-2, 4-3. Secondary windings 5-1, 55-3 and 6-1, 6-2, 6-3 are wound, wound. on two copper plates insulated from each other, the interturn capacitances of which form accumulative —elements 7-1, 7-2, 7-3 {are shown in dotted lines in the drawing). Pulse transformers 1-2, 1-3, are interconnected through separation resistors 8-1, 8-2. Communication capacitors 9-1, 9-2 are included in the control electrode 1O-1, 10 10-3 circuits (switches) so that a series of capacitors 9-1, 9-2 and the interelectrode capacitance of the ignition gap of the switches 2-1, 2-2., 2-3, are parallel to the secondary windings 6-1, 6-2, 6-3 of previous transformers 1-1, 1-2, 1-3. Works cascade pulse generator as follows. The storage elements 7-1, 7-2, 7-3 of the combined transformers 1-1, 1-2, 1-3 are charged from a single power source. The generator is started by applying an ignition pulse to the control electrode 1O-1 of the first switch 2-1. With his work on it. the accumulating element 7-1 of the first cascade is discharged from the primary winding 3-1. A high voltage impulse appears in the secondary. Most of it is fitted to the firing gap of switch 2-2 of the second stage, since the value between the electrode capacitance of this gap is less than the capacitance of the capacitor 9-1 connected in series with it. When the voltage reaches several kilovolts, i.e. at the beginning of the high-voltage pulse front, the switch is triggered, which leads to the appearance of a high-voltage pulse at the output of the second transformer 1-2. The work of the third cascade is similar to the second. The delay time of the operation of each switch with respect to the first one is much less than the length of the front of the high-voltage pulses generated in the secondary windings of the transformer. therefore, all voltage pulses reach their amplitude almost simultaneously. Thus, the capacitive coupling allows to obtain at the output of a cascade generator voltage pulses with the maximum possible amplitude equal to sum-. In addition to the amplitudes of the pulses of all series-connected combined transformers In addition, there is no need for a complex system of starting devices, which greatly simplifies both the circuit and the design of the generator. A cascade high voltage pulse generator containing a power source, combined pulse transformers connected in series through isolating resistors, a coupling capacitor, and a three-electrode current switch connected in parallel to the input of each pulse transformer, with the aim of increasing the amplitude of the high-voltage output pulses, the controlled electrodes of the switches, starting from the second, are connected to the beginning of the secondary winding of the pulsed trans the format of the previous stage through the coupling capacitor. Sources of information taken into consideration. Knowledge of expertise. 1.Mes c. A.A., Nasibov A.S., KremnevV.V. The formation of nanosecond pulses of high voltage. M ,, Energie, 1970, p., 53-56. 2. USSR author's certificate number 149494, cl. H 01 T 27/28, 1968.