SU483743A1 - Voltage divider - Google Patents

Description

The invention relates to power circuits for electron multipliers and can be used in the study of parameters and operation of vacuum-tube devices with secondary electron multiplication: photomultiplier tubes, transmitting television tubes and other instruments.

A voltage divider is known for supplying electrovacuum devices with multiscale. kadnom secondary-electron multiplication, consisting nz capacitors and variable resistors.

The known voltage divider is inconvenient in that the resistance of each resistor can only vary in leaps and bounds, as if bypassing any of the resistors included in one part of the divider, the corresponding resistor is turned on in the other part of the divider. The discontinuous switching does not allow to obtain a smooth, independent adjustment of the voltage on the electrodes of the devices and causes an effective contact fault, which reduces the reliability of the device.

The purpose of the invention is to provide independent smooth voltage regulation on the electrodes of high-voltage electrovacuum devices with multi-stage secondary electronic multiplication at a constant current of the divider, and increasing the reliability of the divider at high voltages.

For this purpose, variable resistors with a linear law of variation of the resistance value are set in pairs in the proposed divider, with a sliding contact of one

of the resistors of each pair is connected to the corresponding electrode of the device and is mechanically connected by a dielectric bridge with the sliding contact of the second, oppositely included resistor of this pair, which

forms an independent voltage control circuit on the pnp electrode, simultaneously compensating for the change in the total resistance, voltage divider. FIG. 1 shows the proposed divider; in fig. 2 is an electrical circuit of the proposed divider.

The divider is assembled from pairwise installed variable resistors 1 with a linear law of change of resistance;

insulated from each other by fixing them on a dielectric base 2 using dielectric brackets 3. Simultaneously changing the resistances of the resistors installed in pairs is carried out

a dielectric jumper 4, mechanically connected with the sliders of the moving contacts of both resistors with the help of studs 5, respectively, in one of the extreme positions, with a dielectric handle 6 fixed on

engine moving contact of one of the resistors, displayed on the front panel 7 of the housing, in which the divider is located. In this case, the dielectric bases are rigidly connected to the front panel. Dielectric knobs provide operation at high voltages on the divider resistors.

An electrical circuit is a series of series-connected variable resistors connected in a rheostat circuit. Resistors Ri-Ri4 are the main links of the divider, to the moving contacts of which are connected the electrodes of an electrovacuum device. Ris-Rss resistors are included in the external circuit of counter-links of the main divider and act as compensating resistances. The number of divider links is determined by the number of electrodes of the connected device. A part of the divider links is shunted by Ci-Cg capacitors, which ensure that the device operates in a pulsed mode when large currents flow.

The divider works as follows.

Each of the resistors of the main divider links, for example, resistor Ri, in the external circuit corresponds to a compensating resistor Ri5, mechanically connected to it in such a way that the resistance of one of the resistors, for example, resistor Ri, increases or decreases. resistor Ris. As a result, the impedance of the divider remains unchanged, and consequently, the current in the divider circuit remains unchanged when the supply voltage source is connected, which ensures independent voltage regulation on any of the electrodes connected to the instrument divider.

The divider can provide independent stepless voltage regulation on the electrodes within any predetermined limits necessary for powering high-voltage electrovacuum devices with multi-stage secondary electron multiplication, with a common supply voltage defined by a number

device electrodes. The power of the divider is carried out from high-voltage stabilized voltage sources produced by industry.

Subject matter

Voltage divider for powering vacuum multi-stage devices with secondary electron multiplication, consisting of capacitors and variable resistors,

characterized in that, in order to ensure independent smooth voltage regulation on the electrodes of the devices at a constant current divider and increase its reliability in operation, it establishes in pairs

variable resistors with a linear law of variation of the resistance value, with the moving contact of one of the resistors of each pair connected to the corresponding electrode of the device and mechanically connected by a dielectric jumper to the moving contact of the second counter-resistor of this pair, which forms an independent voltage regulation circuit on the electrode with simultaneous compensation

changes in the total resistance of the voltage divider.

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