SU97170A1 - AC Voltage Regulator - Google Patents

Description

Known voltage regulators with a saturation throttle, which is a regulating element and controlled by a DC amplifier, the current of the error that is removed from a tungsten-diode diode, which represents a co6oii sensitive element, are unstable, which does not satisfy m reaction speed.

The purpose of the described invention is to increase the accuracy of stabilization achieved by compensating for the variable component of the error signal.

A characteristic feature of the described AC voltage regulator is the inclusion of a diode and a DC amplifier of a double cathode repeater, one triode of which amplifies the total voltage of the signal, 1a pcss.) Matching, and the other only its variable component. After the addition of the output voltages of the four triodes in the counter-op 3, a signal arrives at the input of the DC amplifier, which does not contain a variable component.

The drawing shows a schematic diagram of the proposed AC voltage regulator.

The power circuit of the stabilizer is connected in series, the primary winding / main transformer Tp and the alternating current winding W ,, e / j of the saturation voltage saturation. From the second time to OUTPUT

the winding 2 of the transformer Tp is relieved of the steady-state voltage and, which, through the auxiliary transformer 7 /)., and the rectifier j5 is applied to the anode circuits of the diode Lc. tungsten filament, stabilized volt L., and lamps Ld D; preamplifier.

From a separate sec 1chn1 low voltage winding of the auxiliary transformer Tr-, the filament diode D, receives power. The output circuit of the last stage amplifier with lamps L, and 77, which includes the winding of the Wy droplet DN winding, receives power from the independent rectifier 5., connected to the secondary winding 5 of the main transformer 7 /.

With any deviation of the mains voltage from the nominal value or with a change in the load current, the filament of the diode L, and hence its internal resistance, changes. As a result, the negative difference between the constant potential of point B and the potential of point A. changes.

The resulting error signal is decayable and acts on the control winding Wy throttle DN so as to restore the nominal value of the output voltage U. The voltage between ground (point O) and TO4Koii A consists of a constant component determined by the ratio of the resistance R (and internal resistance of the diode L, at a given heating mode, and a variable component, due exclusively to the thickness of the filament and its cooling rate.

This variable is the component that, after the potential of point A is subtracted from the constant south potential of point B, enters the amplifying path and interferes with the operation of the stabilizer, causing difficult to eliminate fluctuations. The variable component decreases sharply with increasing thickness of the diode filament, but at the same time the stabilizer reaction rate decreases.

To implement a stabilizer that meets the requirements of both stabilization accuracy and reaction speed, the described stabilizer operating on a thin-thread diode provides compensation for the variable component of the error signal. For this purpose, the lamp L, which is a double triode, is included as a cathode repeater. On the grid of the left (in the drawing) lamp triode / L; the voltage is applied from the anode of the diode L. From the cathode resistance R. of this triode, the voltage is removed, which is slightly weakened (by 0.8-0.9 times) the voltage between the points Li and, therefore, contains

constant and variable components.

The right triode of the lamp L., amplifies only the variable component of the complete nanowire of the point A falling on its grid through the capacitor C ;. In the secondary winding of the transformer Tr., Which is connected to the cathode circuit of this triode, only the variable component of the error signal is excited. This variable is taken from the potentiometer RJ, which is parallel to the secondary winding of the transformer, folded in the back of the voltage, which is disconnected from the resistance Rj.

Thus, from the C 1 D output points of a two-sided cathode follower, an almost constant voltage of the error signal is taken off, which is then fed to the grid to amplify L. the node of the double cathode cathode, showing the dotted line in the drawing.

For more stable operation of the circuit, the voltage across the cathode, V / 1, is fed through a negative feedback circuit made up of a capacitor Q and a resistance R7. For the same purpose serves a filter composed of resistors Rj, Rj and capacitors C ,, Cy, Cj.

In order to reduce the control signal, the saturation throttle of the DN has positive feedback, the KOTopoii circuit consists of a winding Woe and a bridge rectifier B-. To improve the shape of the output voltage curve, use a compensating filter made up of Drossel D and capacitor C.

Subject invention

An alternating current voltage regulator, in which a saturation throttle, which is a regulating element, is supplied through a DC amplifier, the error signal removed from the tungsten-drinking diode, which is a co6oii sensitive element, characterized in that, in order to improve the stabilization accuracy, achieved by compensating for the variable component of the error signal, a double cathode repeater is connected between the diode and the DC amplifier, one triode of which amplifies the total voltage and the other is only its variable component so that after adding the output voltages of these triodes out of phase, the input of the DC amplifier receives a signal that does not contain a variable component.