SU1138792A1 - A.c.voltage stabilizer - Google Patents

Abstract

AC VOLTAGE STABILIZER, contents of a discrete action regulator, input pins connected to input terminals, and one output pin to one output terminal, reversive counter, control amplifiers, measurement unit, input connected to output terminals, and output through the control node - to the subtracting and summing inputs of a reversible counter, the outputs of which through control amplifiers are connected to control inputs of a regulator of a discrete action, characterized in that They are fast, they have a booster transformer, the secondary winding of which is connected between another output terminal of the regulator of discrete action ;: and the other output terminal, and the extreme end is connected via analog keys to the second input terminal, the SS unit, the output connected via diodes to the control (L inputs of analog switches, and an additional measurement node connected between the input terminals and the input of the differentiating node.

Description

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CX 1 The invention relates to electrical engineering and can be used in various electrolytic devices. A variable voltage stabilizer is known that contains a power transformer, one of which is connected to the inputs of the terminals, the winding of which is made of adjusting sections connected each to the diagonal of an alternating current of a single-phase thyristor bridge, all bridges are connected to DC in series, the other one is made unregulated, connected to the input terminals via an additional single-phase thyristor bridge, in the diagonal of direct current of which a circuit is included, formed by the main bridges 1. The closest The invention is an alternating voltage regulator containing a discrete-action regulator, input terminals connected to input terminals, and one output terminal with one output terminal, reversible counter, control amplifiers, measuring unit, input connected to output terminals, and output through the control node to the subtracting and summing inputs of the reversible counter, the outputs of which are connected through the control amplifiers to the control inputs of the regulator of discrete action. The regulator of discrete action is made in the form of booster transformers with two groups of switches in the primary windings, with the secondary windings of booster transformers connected in series and the primary windings using one group of keys connected to the output terminals and shunted by the second group of keys mutually coordinated with the first group keys .I. A disadvantage of the known stabilizer of the torus is the limited speed, as in the case of an abrupt change in the amplitude of the voltage in During the stabilizer, a sharp change in the voltage amplitude occurs, i.e. There is not enough stabilizer speed to handle sharp jumps. The purpose of the invention is to increase the speed of the variable voltage regulator. 22 The goal is achieved by the fact that a variable voltage regulator containing a regulator of discrete action has input terminals connected to the input terminals and one output terminal with one output terminal, a reversible counter, control amplifiers, a measuring node, an input connected to the output terminals and the output through the control node to the subtracting and summing inputs of the reversible counter, the outputs of which through control amplifiers are connected to the control inputs of the regulator of the discrete action, a booster transformer, the secondary winding of which is connected between another output terminal of a discrete action regulator and another output terminal, the middle primary output terminal is connected to the first input terminal, and the extreme terminals are connected via analog switches to the second input terminal, the differential node, the output connected through diodes to the control inputs of the analog switches, and an additional measuring node connected between the input terminals and the input of the differentiating node. I Figure 1 shows the variable voltage regulator circuit, Figure 2 shows diagrams of the amplitude variation of the input voltage, the voltage at the output of the regulator of discrete action of the known device, and the voltage at the output of the differentiating node; FIG. The alternating voltage stabilizer (Fig. 1) contains a regulator 1 of discrete action, a measurement node 2, a control node 3 including threshold elements 4 and 5, an inverter 6, a multivibrator 7, a coincidence nodes 8 and 9, and a reversible counter 10, control amplifiers 11, a booster transformer 12, analog switches 13 and 14, diodes 15 and 16, a differentiating node 17 and an additional measuring node 18. The input pins of the regulator of discrete action are connected to the input terminals, one of the output pins directly, the other through the secondary winding of the transformer 12 is connected to the output terminals. Input. Node 2 measurement pgdc connected to output terminals. A reversible counter with 10 outputs is connected via control amplifiers 11 to control the inputs of the regulator 1, the top-level input through the node 9 of coincidence and threshold element 4, and the summer through the node 8 of match, inverter 6 and threshold element 5 with the measuring unit node 2 B. The multivibrator 7 is connected to the inputs of the matching nodes 8 and 9. The primary winding of the transformer 12 is connected to the middle terminal to one of the input terminals, the extreme leads through the analog switches 13 and 14 to the other input terminal. The output of the differentiating node 17 is connected via diodes 15 and 16 to the control inputs of the keys 13 and 14, and the input of the secondary measuring node is connected to the input terminals.

Discrete regulator 1 contains booster transformers, the windings of which are switched with keys. Measurement nodes 2 and 18 are the "bridge" with filter nodes and current limiting resistors. Threshold elements 4 and 5 are implemented on K521SAZ type comparators, logic elements and a counter are implemented on K155 LAZ and K155 IE7 microcircuits.

Control Amplifiers 11: contain single-stage transistor amplifiers.

The analog key 13 is shown in FIG. It contains two transistor-diode keys connected in parallel to one another, one of which is designed to pass a positive half-wave, the other a negative half-wave of a sinusoidal voltage.

The analog switch 14 is made similarly, with transistors with a p-h-p-type conductivity (in the key 13-p-p-p) taken in it, and the polarity of the diodes on is reversed. It is also possible to use high-power field-effect transistors.

The variable voltage regulator operates as follows.

When the voltage at the output Uj is higher than the upper threshold level, the logic 1 signal from the output of the threshold element 4 enters the input of the coincidence unit 9. The pulses from the multivibrator 7 p-appear on the subtracting input of the counter 10. Under the influence of these pulses, the state of the counter 10 changes. This change is transmitted by the control amplifiers 11 to the regulator 1, reducing its transmission coefficient until the output voltage 2 will be less than the threshold level. Further, the process of reducing the transmission ratio of the regulator 1 is stopped, because the logical O signal from the output of the threshold element 5 prohibits the passage of pulses from the generator 7 to the counter 10. If the voltage at the output of the stabilizer is below the threshold level defined by the threshold element 5, the logical 1 signal from the output Inverter 6 allows the passage of pulses of the multivibrator 7 to the summing input of the reversible counter. The state of the counter 10 is changed. Wherein

the transfer ratio of the regulator increases. This change occurs until the input voltage exceeds the lower threshold set by element 5.

The state of the reversible counter 10 remains unchanged until pulses arrive at its summing (subtracting) input, i.e. output voltage will not be less than the lower boundary level (will not exceed the upper boundary level).

The input of the differentiating node 18 receives a rectified voltage proportional to the input. With

a stepwise change in the amplitude of the input voltage (Fig. 2 a) the differentiating node produces a pulsed two-pole voltage

5 (figure 2). In the case of a sharp increase, the positive pulse at the time of the jump from the output of the differentiating node 17 goes through the diode 15 to the input of the analog switch 13. 0 The pulse amplitude is proportional to the value of the voltage drop of the input voltage. The analog switch opens slightly so that the output winding of the transformer 12 induces a voltage, the phase of which is opposite to the phase of the voltage at the output of the regulator 1, and the value is equal to the value of the voltage drop at the output

51

Regulator 1. Thus, the voltage drop is compensated for at the first moment in time. Further, the analog key is smoothly closed, and the threshold element 4 is activated, registering the increase of the upper boundary level. The transmission coefficient of the regulator 1 decreases, and the output voltage (J remains within the specified limits.

In the event of a sharp decrease in the input voltage, a negative pulse from the output of the differentiating node 17 passes through a diode 16 to the input of a switch 14, which is controlled by a negative voltage. The key 14 is opened a little. At the output of the transformer, a voltage appears that is in phase with the output. The voltage drop is compensated. Further, the key 14 is smoothly closed, and the threshold element 5 is triggered. The transmission coefficient of the regulator increases. The output voltage remains within the limits.

The voltage at the output of the stabilizer according to the known scheme with a sharp

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the change in input voltage has the form shown in Fig.2 6. The difference characterizes the time constant of the voltage stabilizer. In order for the proposed stabilizer to work reliably, the time constant of the differentiating node z-- must exceed the time constant of the stabilizer according to the known scheme

10 Thus, the voltage at the output of the stabilizer is stable in amplitude and does not change with sudden drops in the input voltage, i.e. speed of the proposed scheme above.

Introduction of new elements - booster transformer 12, analog switches 13 and 14, diodes 15 and 16, differentiating node 17 and

20 of the additional measurement unit 18 allows a significant increase in the response of the variable voltage stabilizer. In the usual case, before the stabilizer include for

25 smoothing bursts of input voltage complex multilink filters.

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Claims (1)

AC VOLTAGE STABILIZER, containing a discrete regulating element, connected with input terminals to input terminals, and with one output terminal - with one output terminal, a reverse counter, control amplifiers, measuring unit, input connected to output terminals, and output through control unit - to the subtracting and summing inputs of the reversible counter, the outputs of which are connected via control amplifiers to the control inputs of a discrete-action regulating body, characterized in that, with the aim of To improve performance, a booster transformer is introduced into it, the secondary winding of which is connected between the other output terminal of the discrete-action regulator and the other output terminal, and the extreme terminals are connected via analog keys to the second input terminal, a differentiating unit, the output connected via diodes to the control inputs of analog keys , and an additional measurement node connected between the input terminals and the input of the differentiating node.