SU1510053A1 - Device for controlling power thyristor - Google Patents

Abstract

The invention relates to converter technology and may find application in variable voltage regulators, for example, to control the speed of rotation of electric motors, control of electric lighting and electric heating devices, in automatic control systems. The aim of the invention is to enhance the functionality of the device by providing precise control of the output voltage by an external source. This is achieved by the fact that the voltage on the capacitor 3 in the mode preceding the transition of the voltage on the power thyristor 14 through zero is set proportional to the control voltage. In this way, the adjustment time of the thyristor 14 is controlled, and it can also be done by adjusting the resistance of resistor 2. 1 sludge.

Description

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This invention relates to electro. It can be used, for example, in AC voltage regulators for controlling the speed of rotation of electric motors, controlling electric lighting and electric heaters, as well as in automatic control systems.

The aim of the invention is to enhance the functionality of the device by providing precise control of the output voltage by an external source.

The drawing shows a schematic diagram of a device for controlling a power thyristor.

The device contains a D-flip-flop 1, a resistor 2, connected between the power source dropout terminal and the R-trigger input, a capacitor. 3, connecting between the R input of the trigger and the negative output of the power source, a diode 4 connected by an anode to the R input of the D flip-flop and a cathode to a common point of resistors 5 and 6, a resistor 5 connected to the Q output of the trigger, to resistor 6 control voltage is applied. The trigger input is connected to a divider voltage of 2: 1 and resistors 7 and 8. To the Q output of the trigger, through a differentiating chain from capacitor 9 and resistor 10, a current amplifier at transistor 11 is connected, to the emitter of which voltage divider resistors 12 are connected and 13. To the output of which the thyristor control electrode 14 is connected.

The device works as follows.

The voltage from the thyristor 14 anode through a divider on resistors 7 and 8 is applied to the C input of D flip-flop 1. When this voltage reaches the trigger voltage level of flip-flop 1, the latter switches and a single potential appears on its forward output, and the diode 4 closes and the capacitor 3 begins to charge through resistor 2. When the voltage on the capacitor 3 reaches the trigger level at the input R, the trigger switches to the initial state, forming a zero pulse at output Q, the duration of which depends on the resistance of resistors 2, 5 and 6, capacitance capacitor 3 and the value of the control voltage across the resistor 6, the transition trigger

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In the initial state, the capacitor 3 is discharged through diode 4 to a voltage determined by resistors 5 and 6 and the control voltage. Resistor 2 has little effect on the level of capacitor 3, since its resistance must be much greater than the resistance of resistors.

0 5 and 6. The leading edge of the pulse at the output P, differentiated by a chain of capacitor 9 and resistor 10, is amplified by transistor 11 and through a divider on resistors 12 and 13

5 is supplied to the control electrode of the thyristor 14.

The use of the proposed device will allow to expand the functionality of the thyristor control, since it is possible to adjust the opening angle of the thyristor by changing the resistance of the resistor and changing the control voltage, to block the flow of the control signal to

5 thyristor supplying a logical zero to the D input of the trigger, and also to keep the same control pulse at different angles of opening of the thyristor.

Claims (1)

0 claims || Power control device a thyristor containing a first capacitor, the first output of which pre-5 is assigned to be connected to the cathode of a power thyristor, for connecting to the anode of which the first end of the first resistor is intended, the second resistor, the first output connected to 0 the second output of the first resistor the third resistor, the first output of which is connected to the second output of the first capacitor, the fourth resistor, connected in parallel to the input terminals of the power amplifier, the output terminals of which are intended to be connected to the control transition of the power thyristor, connected by the first terminals of the fifth and sixth resistors, characterized in that In order to extend the functionality, a power supply, a diode, a second capacitor, and a D-trigger are introduced, with the second output of the first  the resistor is connected to the C-input of the D-flip-flop, the D-input of which in the operating mode is connected to the positive one, the output of the power source, and the R-input to the second output of the first capacitor and 515100536 Anode of the diode, the cathode of which connects the second output of the third resistor to the first terminals of the first and the neck-diken with the positive output of the source resistors, direct output of the power D-flip-flop, negative output Gera is connected to the second pin of the current, which is intended for connecting the resistor, and its inverse output to the cathode of the power thyristor, and with the first output of the second condensate is the second output of the sixth resistor Predra, the second output of which is connected to be connected to an external the second terminal of the fourth resistor, the source of the control voltage.