SU684524A1 - Ac voltage stabilizer - Google Patents

Description

I

The invention relates to electrical engineering and can be used in the power supply circuits of various radio engineering equipment.

A known stabilizer is an alternating current path containing a power transformer, a phase-controlled thyristors and transistors device, and a phase discriminator ll.

The disadvantages of this stabilizing voltage are:

- narrow range of input voltage (175-24 O);

- high instability of the amplitude value of the output voltage;

- inadmissibility of the short-circuit mode w;

-complicated electrical circuit. The closest in technical essence to the proposed invention is a HARDBOARD containing a choke, made with three windings located on a three-core magnetic core, with a control winding on the middle rod

the power transffmator, the first of which secondary windings is connected to the output pins, and the second - to the input of the first higher point, the second rectifier, variable resistor, diode and sensitive element, connected to the first input of the amplifier 2.

The disadvantages of this device are:

- dependence of the output voltage on the mains frequency;

- low goat stabilization patient;

- the narrowness of the operating range of the network frequency fluctuation (+ 1%)

- inoperability after idling and short locking.

The purpose of the invention is to enhance the functionality by increasing the stabilization factor, extending the stabilization range and ensuring operability after a long short-circuit mode.

The goal is achieved by the fact that, in a known stabilizer of an alternating current voltage, the sensitive element is designed as an amplitude discriminator, the input connected to the output of the second meter, the input of which through a variable resistor is connected to the first secondary winding of the power transformer, the output of the first meter is connected with the second input of the amplifier, the output of which through the diode is connected to the control winding, at the same time, two windings of the throttles, placed on the extreme rods of the three-core magnetic core, start and for the key K input vtodam, and ends, to the primary winding of the power transformer. The block diagram of the AC voltage regulator is shown in the drawing. In the voltage stabilizer, two windings 1, 2 drossel 3, placed on the extreme rods of the three-core magnetic circuit, are connected in series with the primary winding of the power transformer 4, beginnings to the input of the voltage regulator, and ends to the primary winding 5 of the power transformer 4 The third winding 6 droplets 3, placed on the Central rod of the three-core magnetic conductor, is connected via diode 7 to the output of the error signal amplifier 8. The first input (signal) error signal amplifier through the amplitude discriminator 9, The relay is 1O, the variable resistance 11 is connected to the first winding 12 of the transformer and 4 and to the output terminals of the voltage regulator. The second input (power supply) of the error signal amplifier 8 is connected to the second secondary winding 14 of the power transformer 4 by the power supply unit 13. The voltage regulator circuit is based on the known phenomenon of a change in the magnetic permeability of the iron of the magnetic core of the throttle 3 from the bias current. When the bias current flowing in the winding 6 of the drossel 3 changes, the magnetic permeability of the iron heart, and, consequently, the inductance of the windings of the 1 and 2 throttle, changes. Since these windings are connected in series with the primary winding of a power transformer, to change their inductance, it is possible to regulate the voltage on jg the primary winding of the transformer. The change in the inductance of the windings 1, 2 of the throttles 3 is carried out by changing the bias current controlled by the amplifier of the error signal 8, which through the amplitude discriminator 9 is connected to the output of the first center of the target 10 connected through the variable resistance 11 to the voltage circuit (winding 12) of the transformer 4, from which stabilized voltage is removed. When the voltage on the winding 12 increases, the voltage removed from the amplitude discriminator 9 increases, which leads to a decrease in the current in the winding 6 droplets 3, and, consequently, to an increase in the inductance of the windings 1, 2 droplets. This leads to a decrease in the voltage on the winding 5 of the power transformer 4. When the voltage decreases at the output of the voltage regulator, the process opposite to the above occurs. Since the voltage drop on the windings 1, 2 of the droplets 3 in the process of autoregulation can reach the value ZOO B (PREa | 320 V), the windings of the chokes 1, 2 must be turned on so that the magnitude of the alternating voltage induced in the winding 6 tends to a minimum. In order to prevent this voltage from being applied to the error signal amplifier, between the winding 6 of the throttle 3 and the output of the amplifier 8, a diode 7 is turned on. Power of the amplifier 8 is provided from the second side of the mute 13 ,. connected to the winding 14 of the power transformer 4. The main purpose of the winding 14 of the power transformer 4 is to ensure the stability of the voltage regulator circuit during short-circuits. This is ensured by the fact that during a short circuit the voltage across the winding 14 of the power transformer 4 tends to zero, the connection current through the winding 6 drops 3 also tends to zero, which, in turn, leads to the maximum increase in the inductance of the windings 1, 2 drops 2. In comparison with the known ones, the proposed voltage stylizer circuit has the following advantages: - high stabilization factor; - wide range of input nagp; - ascend to smoothly regulate the output voltage; -workable in a wide range of changes in the frequency of the power network; - not critical to the nature of the load; - allows long-term work in idle hots and short zani modes.

Claims (2)

1. Y. Sinegubko. Alternator voltage stabilizer on transistors. Radio, 1972, No. 4, p. 43. 2. USSR author's certificate No. 154327, and 05 F 1/16, 1962. ifff D,