SU1267561A1 - Controlled a.c.voltage - to a.c. voltage converter - Google Patents

Abstract

The invention relates to the field of electrical engineering and can be used to regulate the alternating voltage. The purpose of the invention is the simplification. Variable voltage is controlled by varying the number and order of switching on sections of a sectioned winding of transformer 1. Thyristor switches 2-5, which provide the necessary connections, sections, are controlled by signals from the outputs of the control pulse former 6. The signals from the output of the control unit 7 through the OR element 9, the driver of the control pulses 6 is started, and the corresponding switch 8 is opened, through which the control pulses pass to the control electrodes of the thyristor calls 2-5. Due to the connection of the outputs of the control unit 7 to the input with & of the control pulse generator 6 through the element OR 9, the number of the generator of control pulses (C control pulses decreases to one or two regardless of the number of thyristor switches, which results in a simplification, 4 Il. G

Description

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

The purpose of the invention is to simplify by reducing the number of control pulse drivers.

FIG. Ij and 2 are examples of the implementation of the electrical circuit of the proposed device with thyristor keys on the secondary and primary sides of the transformer, respectively; Figs. 3 and 4 show examples of a schematic diagram of a part of a device consisting of a switch and a driver for controlling soft pulses,

The device of FIG. 1 content transformer 1, thyristor switches 2-5, switching the outputs of its secondary winding, driver (3 control pulses, control unit 7 NIN, switches 8, the outputs of which are connected to control electrodes of the thyristor switches 2-5, and the inputs are connected to the outputs of the control unit 7 and the outputs of the pulse former 6, and the OR element 94 whose inputs are connected to the outputs of the control unit 7, and the output is connected to the input of the pulse former 6,

The device according to FIG. 1 operates as follows.

In accordance with the error signal between the predetermined and actual values of the secondary voltage, the control unit 7 outputs to the corresponding inputs of the switches 8 signals, which bring them to the position corresponding to the required transformation ratio. At the same time, the signals from the outputs of the control unit 7 through the OR element 9, amplified by the driver 6 of the control pulses, arrive at the outputs of the latter. Then, through the switches 8, only those control signals pass to the thyristor switches 2-5. provide connection of the necessary sections of the secondary winding of the transformer 1.

The device according to FIG. 2 contains a transformer 1, the windings of which are connected according to a booster circuit, thyristor keys on counter-parallel thyristors, control driver 6, control block 7, switches 8, the outputs of which are connected to keys 2, 3 and 4, respectively. and the inputs with the outputs of the control unit 7 and the outputs of the control pulse formers 6, the OR 9 element, whose inputs are connected to the outputs of the control block 7, and the output with the inputs of the control pulse formers 6, number of output

Dov each of them is equal to the number of thyristor keys.

The device of FIG. 2 works in the following way.

In accordance with the error signal between the predetermined and actual values of the secondary voltage, the control unit 7 applies signals to the corresponding inputs of the switches 8, which bring them to the position corresponding to the required co-. the effect of transformation. At the same time, the signals from the output of the control unit 7 through the element OR 9 are amplified. shaper 6 control pulses are received at their outputs. Further, through the switches 8, only those control signals are passed which, provide the necessary connection with the types: with the resistors 2-4 windings of the transformer 1 or their shorting in accordance with the operation algorithm specified by the control units 7

In the examples of the parts

5 of the device (FIG. 3, 4), the driver 6 of the control pulses is made on transistor switches 10-12. The outputs of the pulse shaper according to FIG. 3 are made in the form of the conclusions of the secondary

About the coil of the pulse transformer 13, the primary winding of which is included in the output circuit of the transistor switch 2. The outputs of the pulse shaper of FIG. 14 made in the form of vyshod

Claims (1)

5 photothyristors of optocouplers 14, 15 and 16, the LEDs of which are included in the output circuit of the transistor switch 12. The switches in FIG. 3, 4 contain thyristor signals 17–19 and transistor switches 20–22 "Photo thyristors of optocouplers 17-19 are connected between the outputs of the driver 6 of the control pulses and the control electrodes of the thyristor keys, the LEDs of the optors are connected to the transistor switches 20-21, respectively. , and the inputs of transistor switches 20-21 with the outputs of the control unit in the above schemes, control pulses are supplied to the input of the pulse shaper 6 (base of the transistor 10) from the summing device. The transistor-enhanced control signals are separated on the secondary windings of the pulse transformer 13 (Fig. 3) or the photo thyristors of the optros 14-16 (Fig. A), and through the photo thyristors of the optocouple 17g 19 are fed to the corresponding opt :. the thyristor electrodes are equal only if there are corresponding control pulses on the input transistor 20–21 years, the output circuits of which include the LEDs of the corresponding optocouplers. Formula of the invention Adjustable variable voltage to alternating converter, containing transformer, one of whose windings is made sectioned, thyristor keys connected to the outputs of the sectioned winding, control name driver, control unit and switches on the number of thyristor keys, output of each which is connected to the control electrode of the corresponding thyristor key, the first input of each of the switches is soaten with the corresponding output of the control unit: a, and the second turn coupled to a corresponding output of the control pulses constituents. It is distinguished by the fact that, in order to simplify it by reducing the number of pulse formers, an OR input is introduced, each of the inputs of which is connected to the corresponding output of the control unit, and the output is connected to the input of the control pulse former, each of the switches contains a transistor, the source the optocoupler, whose LED forms a series circuit with an emitter-collector junction of the transistor and voltage sources of a constant voltage source, the output base of the transistor is the first in Odom switch, optocoupler photodetector is serially connected with the chains of the second input and output switch II jTT, || n: 2 1 p-g 3 1 I П I fig.Z