RU1804644C - Ac voltage regulator - Google Patents

Abstract

Use: stabilization of change; . -. - - .. 2 T ----------- CA- / W. . .------ .. in the electric invention, the role of the free-wrench is 5 and 6 and in the second clauses 7 and 8. The primary are connected wiring 2 and stabilization 1 il. rw. voltage in secondary power supply and automation systems. SUMMARY OF THE INVENTION: A transformer acts as a booster with an open first key of alternating current on thyristors 5 and 6 and a voltotravel with an open second key of alternating current on thyristors 7 and 8. With a third open alternating current key on thyristors 9 and 10, primary windings 3 and 4 of transformer are connected in a serial connection parallel to the secondary winding 2 and in this case, the input voltage of the stabilizer will be close to the input. 1 ill.

Description

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The invention relates to electrical engineering, in particular to converter technology, and can be used, for example, in AC voltage stabilizers, the actuating element of which is made in the form of a boost booster transformer.

The purpose of the invention is to increase reliability and improve the energy characteristics of the stabilizer.

The goal is achieved by the fact that in the known device, another terminal of the primary winding, which is its end, is connected to the output of the secondary winding associated with the input terminal, and another terminal of the primary winding, which is its beginning, is connected to the output of the secondary winding associated with output pin.

The drawing shows a voltage stabilizer circuit.

The voltage regulator includes a boost booster transformer 1, in which the secondary winding 2 is connected to the input and output terminals of the stabilizer, and the primary windings 3 and 4 are connected in series. Moreover, the output of the primary winding 3, which is its end, is connected to the output of the secondary winding 2, connected to the input output, the output of the primary winding 4, which is its beginning, is connected to the output of the secondary winding 2, connected to the output output. The free ends of the primary windings 3 and 4 are connected to one of the terminals of the alternating voltage source via thyristor switches on counter-parallel connected thyristors 5-8. To the free ends of the primary windings associated with the thyristor switches on thyristors 5-8, a thyristor switch is connected on counter-parallel connected thyristors 9 and 10. The control electrodes of all thyristors are connected to the control unit 11.

The voltage stabilizer operates as follows.

If the mains voltage is greater than the rated input voltage, then in the initial part of each half-cycle of the input voltage thyristors 5 and 6 are switched off. Their inclusion ensures the connection of winding 3 to the power source. In this case, the winding 2, which is connected counter-with the mains voltage, provides a voltage circuit, the voltage at the output of the voltage stabilizer being less than the mains voltage. If the mains voltage is less than its maximum value, with a time offset determined by the deviation of the output voltage from the nominal, from the control unit 11 are turned on

thyristors 9 and 10. When thyristors 9 and 10 open, thyristors 5 and 6 close. In this case, two according to the included primary windings 3 and 4 and sequentially with them

the switched on secondary winding 2 is shorted by thyristors 9 and 10, the voltage at the output of the stabilizer is equal to the voltage of the network. The slew rate of the current on the thyristors 9 and 10 will be determined in this case

0 the inductance of the circuit from series-connected thyristors 9 and 10 of the primary windings 3 and 4 and the secondary winding 2.

If the mains voltage is less than the rated voltage, then during each half-cycle

5 of the input voltage, thyristors 9 and 10 are turned on, providing a short-circuit mode for windings 3 and 4. The voltage at the output of the stabilizer is almost equal to the mains voltage.

0 IF the mains voltage is greater than the minimum, thyristors 7 and 8 are turned on with a time offset from the control unit 11. A reverse polarity voltage is applied, while the open thyristors

5 9 and 10 and closes them. In this case, the winding 4 is connected, providing a mode of boosting. The current slew rate on thyristors 7 and 8 will be determined by the inductance of the circuit secondary winding 2 - primary winding 4.

Thus, the voltage at the output of the voltage regulator is maintained at the nominal level.

An increase in reliability in the operation of the voltage stabilizer is achieved due to the fact that the current of the included thyristors 7, 8 and 9, 10 passes through an additional inductance equal to the inductance of the secondary winding 2.

0 Improving the energy characteristics of the transformer is achieved by shorting three windings with thyristors 9 and 10. As a result, the current and power losses in the K.Z. mode are reduced.

5 Claims

An AC voltage stabilizer comprising a transformer, three AC switches and a control unit connected to output terminals by an input,

0 and the secondary winding of the transformer is connected between the first input and first output terminals of the stabilizer, the first one, the primary winding with the end through the AC pye key is connected to the secondary second input and second output pins of the stabilizer, to which the second primary is connected via the second AC key transformer winding, and a third alternating current switch is connected between the end of the first and the beginning of the second primary winding terminal of the stabilizer, and the second transformer, characterized em.vichna numbered transformer winding end, a first primary winding of transformer-one with the first output terminal

a torus beginning connected to the first stabilizer input.