SU1233248A1 - Voltage divider - Google Patents

Abstract

The invention relates to a measurement technique and can be used in the design of dividers for measuring pulse voltages. The purpose of the invention is to improve the transfer properties of the divider and to reduce the power dissipation. The device contains a resistance 1 surrounded by a coaxial screen potentially connected to the midpoint of the divider, compensating capacitor 3 connected between the screen and the high-voltage end of the divider. The parasitic capacitances of the screen with respect to earth 4 and with respect to the supply wire of high voltage 5 combined with the compensating capacitor 3 form a capacitive divider, due to which the initial voltage distribution becomes more uniform, and the potential of the midpoint of the divider during the entire transition process is almost constant. is equal to half of the voltage pulse applied to the divider, which significantly improves its transmission characteristics. The connection capacitance 6 of the divider screen significantly reduces the rise time of the transient response and makes it less dependent on the resistance of the divider. 2 Il. cl

Description

one

The invention relates to a measurement technique and can be used in the design of dividers for measuring pulse voltages.

The purpose of the invention is to improve the transfer properties of the divider and reduce power dissipation.

FIG. 1 shows the scheme of the proposed divider; in fig. 2 is a circuit for replacing a divider.

Resistance 1 divider is surrounded by a coaxial screen 2, potentially connected to the midpoint of the divider. A compensating capacitor 3 is connected between the screen and the high-voltage end of the divider. The parasitic capacitances of the screen relative to the ground 4 and the high-voltage lead-in wire 5 together with the compensating capacitor form a rigid divider, due to which the initial voltage distribution becomes more uniform the divider during the entire transition process is almost constant and equal to half of the voltage applied to the pulse divider, which significantly improves its transmission characteristics. The communication capacitance 6 of the shield-divider significantly reduces the rise time of the transient response and makes it less dependent on the resistance of the divider. The charge of this capacity is made by the current divider. Above the contact point, the screen-divider charge current has a direction from the divider to the screen, and below - from the screen to the divider. Longitudinal divider capacity

33248

its influence on the voltage source is insignificant, the coaxial screen may be all-metal or consist of a number of circular

5 electrodes, potentially interconnected- The use of a compensating capacitor, whose capacitance is small, together with the parasitic capacitances to give the screen a certain potential, improves the transfer properties of the divider. The initial division of voltage along the height of the divider becomes more uniform, with an increase in electrical current.

15 structural strength. Equipotential screen compared with the ohmic more economical - both due to the reduction of component elements (resistors), and due to the dissipated

70 power, which in the case of an equipotential screen is practically absent.

Claims (1)

Invention Formula A voltage divider containing resistive elements and a coaxial screen is distinguished by n. The fact is that, in order to improve the transfer properties of the divider and reduce power dissipation, it is equipped with a compensating capacitor connected between the high voltage end of the divider and a coaxial screen that is electrically connected to the midpoint of the divider. a screen with respect to the ground and a high-voltage lead,