SU386388A1 - STABILIZER OF AMPLITUDE VALUE OF RECTANGULAR AC CURRENT - Google Patents

Description

I

A rectangular-shaped AC voltage regulator is known, comprising a square-wave generator, the output of which is connected to a series-connected load and current sensor, a regulating element connected to one of the supply lines between the primary source and the generator, the feedback circuit consisting of a series-connected AC amplifier, to the input of which one is connected. coupling capacitor element of comparison, synchronous detector and low pass filter. The output of the low pass filter through a constant voltage source is connected between the control electrode of the regulating element and another power supply.

In order to increase the stabilization factor in the proposed stabilizer, the comparison element is connected via an additional key element to the current sensor and at the same time through another additional key element with an additional constant source of this voltage. The control electrodes of both key elements are connected to an additional output of a square PULSE generator.

FIG. 1 is a schematic diagram of the described stabilizer; in fig. 2, a - e - time diagrams of the scheme.

The supply voltage through the regulating element (composite transistor) / is supplied to the amplifier 2 of the power of the generator 3 rectangular pulses. To create an initial

The magnitude of the controlled current in the circuit is SOURCE 4 constant reference voltage, and the source is 5 i; the constant reference voltage. The reference element 6, made on a resistor, is connected

with the current sensor 7 and the source 5 through the key elements 8 and 9, respectively, controlled from the master oscillator JO, the feedback value consists of the amplifier // ac current, the synchronous detector 12 controlled by the master oscillator 10, and the filter 13 low frequency, the output of which is connected through the source 4 of the reference voltage between the base of the regulating transistor and the positive current. Amplifier input //

through separation capacitor 14 is connected to element 6 of the comparison.

As a result of the switching, the transistor amplifier power 2, controlled from the master oscillator Yu, in the load circuit

15, an alternating current (AC) of rectangular shape (FIG. 2, a) flows, creating a drop in voltage on the current sensor 7. By closing the key element 5 on the comparison element 6, the impulse Uoc of the signal feedback signal (Fig. 2, b) is highlighted, and the closure of the key element 9, the pulse 17 of the reference voltage (fng. 2, c).

Thus, as a result of the alternate operation of key elements, a periodic sequence of unipolar rectangular pulses f / ec is applied to the element of the equation (Fig. 2, d). If the amplitudes of these pulses are unequal, the voltage in the comparison circuit contains a constant and a variable component.

Variable component t / in. proportional to the amplitude difference of the pulses: In the reference voltage and load current (error signal), through the coupling capacitor 14 is fed to the input of the AC amplifier 1 (Fig. 2, e), which after amplification and detection by the synchronous detector 12 direct current (Fig. 2, e) is fed to the input of the regulating element /, which leads to a change in the supply voltage of the amplifier 2 power and, consequently, the current in the load 15. The current changes until its amplitude reaches the specified know determined by the level of the reference voltage.

The proposed AC stabilizer circuit can be converted to a stabilized AC voltage source, for which the feedback resistor is replaced with a voltage divider connected in parallel with the load.

Subject invention

A square-shaped AC amplitude regulator, comprising a square pulse generator, connected to the output in series with a load and a current sensor, a regulating element connected to one of the power rails between the primary source and the square pulse generator; a feedback circuit consisting of a series-connected amplifier of a bifurcated current, to the input of which a comparison element, a synchronous detector and a low-pass filter is connected through the coupling capacitor

frequency, the output of which through a constant-voltage source is connected between the control electrode of the regulating element and another power supply bus, characterized in that, in order to increase the stabilization factor, the reference element is connected via an additional key element with a current sensor and simultaneously through another additional key element with

an additional source of constant reference voltage, and the control electrodes of both key elements are connected to an additional output of a square pulse generator.

// o y f Uc.