SU936274A1 - Thyristor control device - Google Patents

Description

The invention relates to a converter technique and can be used for contactless control of the load in the vault stages of thyristor based automation devices.

Known devices for controlling the thyristor, containing diodes and resistors 1.

A disadvantage of the known devices is the low reliability of locking the thyristor, since only one pulse is formed for locking.

The closest to the image in terms of the means and results achieved is a device for phase-thyristor control of the thyristor, containing an auto-generator on a transistor with a transformer having one input and two output windings, a diode, two capacitors, terminals for connecting a control voltage source, a current source ,, anode, cathode and control electrode of the thyristor and load 2.

A disadvantage of the known device is the low reliability of locking the thyristor, since it does not ensure the production of single pulses with an adjustable phase.

The purpose of the invention is to increase the reliability of locking the thyristor.

Claims (2)

The goal is achieved by the fact that in the device the transistor is connected by an emitter to the terminal for connecting the positive output of the current source and to the first terminal for connecting. nor the load, the second terminal for connecting which is connected to the terminal for connecting the thyroid diode anode, which is connected through the first capacitor and the first output winding of the transformer to the terminal for connecting the thyristor cathode connected to the negative terminal of the current source and one of the terminals connection of the control voltage source, the second terminal for connecting which is connected to the terminal for connecting the control electrode of the thyristor, the base of the transistor The transformer collector is connected to the diode anode and to one output of the second output winding, the other output of which is connected to the cathode of the diode, to the terminal for connecting the anode of the thyristor and through a resistor to the connection point input winding of the transformer with a second capacitor. The drawing shows a circuit diagram of a device for controlling a thyristor. The device contains a terminal for connecting the anode, the cathode and the control electrode of the thyristor 1, terminals for connecting the load 2, capacitor 3, auto-oscillator 4. The latter includes transistor 5, transformer 6 with one input and two output windings, diode 7, condensation. .tor 8. The device works as follows. The control input of the device is connected to the control electrode of the thyristor 1. In the initial state, when there is no control voltage at the input, the thyristor 1 is closed and the current through the load 2 does not flow. When a control voltage is applied to the input of the device, a control current of Tiris 1 appears, which is connected through the load 2 and, the open thyristor 1 from the power source flows the load current. In this case, the autogenerator 4 is started and a constant pulse generation begins. Duty is selected so as not to degrade the form of voltage on the load 2. The thyristor 1, at which voltage dips appear on the anode, does not close because there is a control voltage on its control electrode. When the voltage is removed from the device, the thyristor 1 is turned off by the first impulse of the auto-oscillator 4, after which the auto-oscillator 4 is turned off. In case of interference, as a result of which the thyristor does not turn off, or it is turned off again, the auto-oscillator 4 is started and impulse from its output, thyristor 1 is turned off. Thus, the use of an image in a thyristor control device provides an increase in the reliability of the thyristor lock and noise immunity of the device. Claims An apparatus for controlling a thyristor comprising an oscillator on a transistor with a transformer having one input and two output windings, a diode, two capacitors, terminals for connecting a control voltage source, a current source, an anode, a cathode and a control electrode of the thyristor and a load, What is different is that, in order to increase the reliability of locking the thyristor, in it the transistor is connected by an emitter to the terminal for connecting the positive output of the current source and to the first terminal for connecting the load, the terminal terminal for connecting which is connected to the terminal for connecting the thyristor anode, which is connected through serially connected. the first capacitor and the first output winding of the transformer with the terminal for connecting the cathode of the thyristor connected to the terminal for connecting the negative terminal of the power source and one of the terminals for connecting the source voltage control unit, the second terminal for the connection of which is connected to the terminal terminal for connection of the control electrode of the thyristor, the base of the transistor is connected through transformer input winding and the second capacitor with its emitter, the collector of the transistor is connected to the diode anode and to one output of the second output winding, the other output of which is connected to the diode cathode, to connect the thyristor anode and through the resistor to the connection point of the transformer to the second capacitor . Sources of information taken into account in the examination 1. USSR author's certificate 383194, cl. H 02 R 13/16, 1970. 21 USSR Copyright Certificate 721885, cl. H 02 M 1/06, 1977. ff, -0 L 0EC fSIE