SU1338051A1 - Device for controlling reversible bridge selector switch - Google Patents

Abstract

The invention relates to the field of automation and can be used to reverse the current in the load according to a predetermined program, for example, in tracking systems. The aim of the invention is to simplify the control device of the reversing bridge switch and increase the reliability of its operation. The device contains the first transformer 1 with windings 2, 3 and 4, the source 5 of alternating voltage, the second transformer 6 with windings 7, 8 and 9, the third transformer 10 with windings 11, 12 and 13, electronic keys 14 and 15, triggered by signals of different polarities, rectifiers 16-19, reversing bridge switch 20 on transistors 21-24, load 25, source 26 of constant voltage. The control signal is fed to the input of the device, and depending on its polarity, either the first 14 or the second 15 electronic key is triggered. When the polarity of the control voltage changes, the direction of the current in the load does not change. Achieving this goal is provided by new functional connections between the circuit elements and the proposed circuit design of the device. 1 il. i (L

Description

The invention relates to automation and can be used to reverse the current in the load according to a given program, for example in the following systems.

The object of the invention is to simplify the control device of the reversing bridge switch and to improve the reliability of its operation.

The drawing shows a schematic diagram of the device.

The control device of the reversing bridge switch contains the first transformer 1 -with three windings 2-4, the alternating voltage source 5, the second transformer 6 with three windings 7-9, the third transformer 10 with three windings 11-13, the first 14 and the second 15 electronic switches , triggered by signals of different polarities, four rectifiers 16-19, a reversing bridge switch 20 on transistors 21-24, a load 25 and a constant voltage source 26.

The primary winding 2 of the first transformer 1 is connected to the alternating voltage source 5, the second winding 3 of the first transformer 1 is connected to the primary winding 7 of the second transformer 6 directly, and the second through the first electronic switch 14, the third winding 4 of the first transformer 1 is connected to the primary winding 11 of the third transformer 10 by the first output directly, and the second through the second electronic key 15, the inputs of the first and second rectifier 16 and 17 are connected to the second and third windings 8 and 9 of the second trans Matora 6, and the outputs with the first pair of transformers 21, 24, which are the opposite arms of the reversing bridge switch, the inputs of the third and fourth rectifiers 18 and 19 are connected to the second and third windings 12 and 13 of the third transformer 10, and the outputs to the second pair transistors 22 and 23, a reversing bridge switch 20, in one diagonal of which the load 25 is switched on, and in the other - a source 26 of constant voltage.

The device works as follows.

A control signal is input to the device. Depending on its polarity, the first is triggered.

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The electronic switch 14 or the second electronic switch 15. If the first electronic switch 14 is triggered, the voltage from the second winding 3 of the transformer 1 will be applied to the primary winding 7 of the transformer 6, and the voltage from its secondary windings 8 and 9 will be rectified by rectifiers 16 and 17. The voltage from the rectifier 16 opens the transistor 24, and the voltage from the rectifier 17 - a transistor 21. In this case, the current flows in the direction: the positive pole of the source 26 of the constant voltage collector - emitter of the transistor 21, the load 25, collector - emitter transist pa 24, the negative pole of source 26, the constant voltage. If the second electronic switch 15 is activated, the voltage from the third winding 4 of transformer 1 will be applied to the primary winding 11 of transformer 10, and the voltage from its secondary windings 12 and 13 will be rectified by rectifiers 18 and 19. The voltage from rectifier 18 opens the transistor 23, and the voltage from the rectifier 19 is the transistor 22. In this case, the current flows in the direction: the positive pole of the direct voltage source 26, the collector - emitter of the transistor 23, the load 25, the collector - emitter of the transistor 22, the negative pole source 26 post DC voltage.

When the polarity of the control voltage changes, the direction of the current in the load changes.

Claims (1)

40 claims five 0 five A reversing bridge switch control unit comprising transformers, rectifiers, and two electronic switches, characterized in that, with a view to simplifying and increasing reliability, the primary winding of the first transformer is connected to an alternating voltage source, the second winding of the first transformer is first connected the output directly, and the second output through the first electronic key, the third winding of the first transformer is connected to the primary winding of the third trans of the formatter by the first output directly, and by the second output - through the second elec- the throne key, the inputs of the first and second switches, the inputs second rectifiers are connected to the secondary and fourth recipients of the sudipena windings of the second transformer with the secondary windings of the third pa, and the outputs - with the first pair of tran-transformer, and the outputs - with the second resistors, which are the counter-pair of reversible transistors by the complex arms of the reversing bridge switch.