SU389557A1 - ELECTRODYNAMIC CAPACITOR - Google Patents

Description

one

The device is designed to convert a DC current signal to a temporary signal in the input circuits of amplifiers with high sensitivity to current or voltage.

Electrodynamic capacitors are known, consisting of a fixed plate and an oscillating system with a movable plate.

The goal of the survey is to reduce the zero drift.

The proposed capacitor is distinguished by the fact that its oscillating system is made in the form of a vibrator limiting device, on the bark of which a movable plate is fixed, and without moving the plate attached to the vibrator limiters.

The device is shown schematically in the drawing.

The fixed plate / reinforced / with the help of the insulator 2 and the bracket 3 on the limiters 4 of the vibrator of the oscillatory system. The latter is connected to the movable plate 5 by the assistance of the rack 6.

The vibrator is made in the form of a scanner with a shock mass of core 7, mounted on a flexible plate 8 in the holder 9. The plate is located between the excitation coils 1G, alternated current through a valve and turned on in such a way that the current flows

through the coils in turn, for half a period through each.

The unrepeatable magnetic field that is excited in this way causes measles to make vibro-impact vibrations, hitting one or the other restraint at the end of each half period. At the same time, the plate 5j moves along with the shock mass of core 7, twice during the oscillation period of the core passes

.frame plate 1, remove from the latter, then right, then left. The dimensions of the gap between the limiters 4, the plates o and the impact mass 7 are chosen so that the capacitance of the capacitor formed by the plates / and 5 varies as the / plate 5 moves relative to the plate / from some maximum value to almost zero. Due to this, the modulation depth is practically equal to one. Accordingly, the gain of the dynamic capacitor is increased.

In the described capacitor, the drift of zero is excluded, because the oscillation of the frequency (or current) of the feeding voltage does not affect the amplitude of the oscillating oscillations, which is explained by the amplitude response frequency characteristic of the latter.

Temperature changes in the natural frequency of the core oscillations do not cause a zero drift either, since the amplitude of vibratory oscillations does not depend on the natural frequency of the core.

Subject invention

Electrodynamic capacitor, consisting of an movable plate and an oscillating system with a movable plate, characterized in that, in order to reduce the zero drift, the oscillatory system is made in the form of a vibrator with limiters, on which the movable plate is fixed, and the epidermal plate is fixed on: vibrator limiters.