SU1241206A1 - A.c.voltage stabilizer - Google Patents

Abstract

The invention relates to a stabilized alternating voltage power supply. The aim of the invention is to reduce the weight and size of the stabilizer. The stabilizer consists of a booster transformer 1 with 2,3,4 windings and thyristor switches 5,6 and 7,8. The thyristor keys are controlled by block 9. The goal is achieved by adding an additional power source 10 to the circuit, the voltage value of which is chosen, from the condition:. (k + 1) k / () k 6U / u -. () / / () C (O (L 5yM tsD 4 1h9 O FR of figs;

Description

de k ..,. w .-, / w, oC - K «2

k /

w, 12U1206

the transformation ratio of the stand-by transformer in the volt-deduction mode; the transformation ratio of the voltage-supply transformer in the voltage mode,

I

The invention relates to electrical engineering, in particular, to medium and high voltage variable voltage stabilizers, and can be used in power supply circuits for radio electronic and other devices.

The purpose of the invention is to reduce the mass and size of booster transformer.

Figures 1 and 2 show examples of the design of the stabilizer circuit.

The stabilizer of FIG. 1 contains a booster transformer 1, the secondary winding 2 of which is connected to the input and output outputs of the stabilizer, and the primary windings 3 and 4 are connected in series, and the thyristor switches on the counter-parallel thyristors 5,6 and 7 ,eight. The control electrodes of the thyristors are connected to the thyristor control unit 9, and the free outputs of the primary windings 3 and 4 are connected to the terminals of the auto-transformer 10.

The stabilizer of figure 1 works as follows.

At the beginning of each half cycle of the primary current, a thyristic 5 -6 or 6 is turned on (in the corresponding half period). Turning on these thyristors provides the connection of the winding 3 to the alternating voltage network. Meanwhile, the winding 2 is turned on with the mains voltage, providing a voltage recovery mode, the voltage at the output of the stabilizer is less than the supply voltage. With temporary

,

l

and W.

W, the number of turns of the primary winding of the volt- additional transformer in the modes of volt extraction and voltage addition, respectively,

the number of turns of the secondary winding of a volt- auxiliary transformer.

by a phase shift determined by the deviation of the output voltage from the nominal, the thyristor 7 or 8 is turned on from the control unit 9. When the thyristor 7 or 8 is opened, the previously open thyristor 5 or 6 is locked. In this case, winding 4 is turned on and the operation mode of the booster transformer on the booster is provided. Thus, the output voltage of the stabilizer (its effective or average value) is maintained equal to the nominal output voltage.

An additional source is made on the autotransformer 10.

The alternating voltage stabilizer of FIG. 2 contains a booster transformer 1 in which the secondary winding 2 is connected to the input terminal 1 m and the output terminals of the stabilizer, the primary windings 3 and 4 are connected | 1 in succession, their common output is connected to the phase terminal A of a three-phase network, and their free terminals are connected to the zero terminal and the phase terminal B (C) via the thyristor keys on the opposite-parallel thyristors 5.6 and 7.8. The thyristor control electrodes are connected to the thyristor control unit 9.

The stabilizer of figure 2 works as follows.

At the beginning of each half cycle of the input current, a thyristor 5 or 6 is turned on (in the corresponding half period). The inclusion of these thyristors provides a winding connection.

3

3 between the zero terminal and phase A of a three-phase network. In this case, the winding 2, which is connected in opposite with the mains voltage, provides the mode of volt extraction, the voltage at the output of the stabilizer is less than the mains voltage. With a temporal phase shift determined by the deviation of the output voltage from the nominal, the thyristor 7 or 8 is turned on from the control unit 9. When opening thyristor 7 or 8, thyristor 5 or 6 is locked. In this case, the winding 4 is connected between phases A and B (C) of the three-phase network and a mode of operation for the volt-wiring is provided.

Thus, the output voltage of the stabilizer (its effective or average value) is maintained equal to the nominal output voltage.

Of the three stabilizers, similar to those shown in FIG. 1 and 2, one three-phase stabilizer can be composed.

In the proposed stabilizer, the provision of a smaller voltage-to-boost voltage is achieved due to the lower voltage applied to the winding 3, and the number of turns and sizes of the winding 3 are close to the number of turns and sizes of the winding 4, which leads to a decrease in the mass and dimensions of the booster transformer compared to the prototype.

The circuit of FIG. 1 is most appropriately used in cases where the presence of an autotransformer is also due to other purposes, for example, the creation of an artificial zero in stabilizers for a three-phase network without a neutral wire. The circuit of FIG. 2 is simpler and can be used, for example, in stabilizers for a three-phase network with a neutral wire.

Claims (3)

1. An alternating voltage stabilizer containing a booster transformer with two primary windings connected in series, two thyristor switches and a thyristor switch control unit associated with the input terminals the secondary winding of booster transformer is connected between the corresponding input and output terminals, the common output of the primary actuators is 064 the current is connected to the first terminal for connecting the power source, and one free output of the primary windings through the first thyristor switch is connected to the second terminal for connecting the power source, characterized in that, in order to reduce the weight and size, an additional power source is introduced into it, Moreover, the other free output of the primary windings through the second thyristor switch is connected to the output of the additional power source, the voltage value of which is chosen from the condition: (kcC + Dkj  and and /  Kfi-1 20 25 , 0 five five where k - is the transwj coefficient volt-booster transformer formations in volt recovery mode;  - the number of turns of the primary winding of booster transformer, providing work on the volt; W4 L W - transformation ratio of booster transformer in the voltage add-on mode,  - the number of turns of the primary winding booster transformer, providing work on the booster w is the number of turns of the secondary winding of booster transformer. 2. A stabilizer according to claim 1, characterized in that the additional power source is provided on an autotransformer, the input terminals of which are connected to the terminals for connecting the power source, and one of the output terminals is the output of the additional power source. 3. The stabilizer according to claim 1, in which one of the phase voltages of the three-phase network is used as an additional power source. D OT0 o- Editor A. Ogar Compiled by C, Chg; ph; peva Tehred L, Oleykn:; Cor; lecturer M Sharoshi Order 3487/42 Circulation-835 Ledger VNISHI USSR State Committee on inventions to discoveries 113035., Moscow, ZH-ZZ, PayiirciiaH emb., d, 4/5 Polygraphic Production Production;;; l gie,:. zhgors, :: and str.