SU1610554A1 - Device for shaping thyristor control pulses - Google Patents

Abstract

The invention relates to a converter technique and can be used to generate thyristor control pulses. The purpose of the invention is to increase the reliability of thyristor control. The goal is achieved by starting each of the single-oscillators 2,3, including transistor switches 5 and 6, from a transistor switch activated by another single-oscillator. Since damage to the elements or connections in the push-pull amplifier 4 or one-shot 2 and 3 and the connections between them transistor switch 5,6 amplifier 4 occupies one of two stable states (open or closed), the voltage drop across the output transistor Key 5 or 6 is missing and the launch of the one-shot 2 or 3 does not occur. Pulse generation is stopped. There is a significant discrepancy between the input and output of the device, which is reliably distinguished by the EXCLUSIVE OR 11 element, the output voltage of which triggers trigger 13, which blocks the input signal. Poor-quality control pulses are not generated; the inclusion of thyristors is skipped without damaging them. In addition, there is no overlap in the device, i.e. simultaneous open state of two transistor switches 5 and 6. 2 Il.

Description

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The invention relates to electronic engineering, computer technology, in particular, to converter equipment, and can be used to generate thyristor control pulses connected in series (in parallel). The aim of the invention is to increase the reliability of thyristor control by eliminating the possibility of generating poor-quality control pulses in case of damage elements; and device connections, I Figure 1 shows the device; Figure 2 shows time diagrams that explain his work.

The device consists of a master oscillator 1, filled in the form of the first 2 and second 3 single vibrators, a push-pull amplifier 4 pulses with the first 5 and second 6 transistor switches and an output transformer 7 connected via expander 8 to the thyristor converter 9; And 10, the first input of which is an input terminal for connecting the input source, and the output is connected to the input of the first one-oscillator .2, the output of which is connected to the input of the first transistor switch 5, the output of which is connected to the input of the second one-oscillator 3. the output of which is connected to the input of the second transistor switch 6, the output of which is connected to the second input of the AND 10 element, is an EXCLUSIVE OR 11 element, the first input of which is connected to the first input of the AND 10 element, the second input is connected via a rectifier 12 from the output d nym transformer 7 and vkod through trigger 13 is connected to the third input of AND gate 10.

The operation of the device, in the absence of faults, is as follows.

In the initial state, the input signal Uuv is missing. The voltage U, g at the output of the element And 10 is zero. Write it down

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one-shot 2 and 3 are respectively zero, transistor switches 5 and 6 are locked, the voltage on their outputs U 5 and Ug are equal to Unj, the control pulses and. no device output. Since the voltages arriving at the same time through RC circuits with the same constant to both inputs of the element

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EXCLUSIVE OR 11 is equal to zero, the voltage at its output U is also zero, and the flip-flop 13 maintains the output voltage of logical 1 and, established after turning on the power supply, there is no input signal. When the input signal comes to the output of the element And the voltage changes from the logic level O to the logic level 1, the first one-oscillator 2 is started, at the output of which a positive voltage I2 of duration t appears, which unlocks the first transistor switch 5. Considering the off time tg of the transistor a voltage Ug of duration t + t is formed at the output of the device. When the first transistor switch 5 is locked, the voltage drop U y from the logic level O to the logic level 1 starts the second single-vibrator 3 5 at the output of which a positive voltage U j with a duration of the unlocking second transistor switch 6 is output. Considering the off time tg of the transistor At the output of the device, a voltage Ug is formed with a duration of t + t, At tg. t eg. Set t. ,, At-tg / tp, which takes place at the technological variation of static transmission coefficients, set t | and tj so that t + tgj

 t2, + 62 mox P 3 °, the bias of the output transformer 7 is absent, a high-quality control impulse is formed. With the locking, SRI of the second transistor switch 6, the voltage Ug goes to the element 10 and in the presence of the input signal Ug) (a voltage drop U from the logical level O to the level logical 1 starts the first one-oscillator 2, etc., i.e. The unlocking of each transistor key occurs only after locking the other transistor key, the overlap, i.e., the simultaneous open state of two transistor blades, is eliminated. In the absence of an input signal UB (O, the voltage level on the code of the AND 10 element is logical ne A single one-shot 2 does not occur, i.e., generation always ends with the second one-shot 6, and begins with the first one-shot 5, i.e.

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The transformer output core operates on a full hysteresis loop and a quality control pulse is generated.

Consider the operation of the device in the presence of some faults. For example, when the transistor locks the transistor switch 5 to lose control (time moment t in Fig.2), the transistor occupies a steady state (locked), the voltage drops Uy at its output, triggering the second one-shot 3, are absent and after locking the transistor of the second transistor key 5 (time t) generation is terminated. There is a significant discrepancy between the input and output signals of the device, which reliably picks up the EXCLUSIVE OR element in the form of a positive voltage U at its output, which triggers trigger 13, blocking its voltage with an O input. The control pulse generation is stopped. With such damage, as, for example, the breakdown of the transistor of the second transistor switch 6, the voltage level Ug at its output I takes the value of logical O, the voltage level at the output of the element And 10 is set equal to logical O, the voltage drop at the input of the first single-oscillator 2 is absent , the one-shot 2 does not start and the generation of pulses is stopped. There is a significant discrepancy between the input and output signals of the device, which is reliably distinguished by the EXCLUSIVE OR 11 element in the form of a positive voltage, which triggers trigger 13, which blocks the input signal with its voltage U. The control pulse generation is stopped. Similarly, for other damages, such as a one-shot or a connection, there are no voltage drops at the output of the transistor switches and the generation stops, the control pulse is not generated.

In the device, the start of each single-vibrator, including a transistor switch, comes from a transistor switch, which is switched on by another one-oscillator, i.e. launch of each single-channel 1055/4

The controller is avisit on the state of the transistor switch that is turned on by other monobilators. When rummed%; p. od1: the ratchet of the ratchet, which worked in the foregoing tact, whether its transistor junction is broken or if the connection between them is broken, the transistor of the same transistor switch occupies one of the two resistive (open or closed) conditions, the voltages at its output lack the launch of a one-shot, operating in the subsequent clock cycle, and do not occur. Accordingly, there are no voltage drops at the output of the transistor switch eI, the pulse generator is stopped. This results in a significant discrepancy between the input and output signals.

20 devices that are reliably secured. As a result, the input signal is blocked, poor quality control pulses are not generated, which improves the reliability of thyristor control.

25 Thus, compared with the prototype, in the proposed device, the number of thyristors damaged during operation is reduced, and the idle time of thyristor arrays regatta associated with the replacement of damaged thyristors is reduced.

Claims (1)

Invention Formula A device for generating thyristor control pulses, containing a master oscillator, the first and second outputs of which are connected to the control inputs of the first and second transistor switches of a push-pull pulse amplifier, the output of which is connected to the primary winding of the output transformer, whose secondary windings are connected to the input of A mittener, the output of which is used as an output of the device, characterized in that, with the aim of increasing the reliability of controlling the thyristors by eliminating when the transformer is damaged and the device is damaged, an element is entered. An element is EXCLUSIVE OR, a trigger and an additional terminal, and the master oscillator is two single-vibrators, the first input of the element AND is used as an input for the device and the output is connected to the input first one-sided the torus of the master oscillator, the output of which was used as the first output of the rear end of the reiieparopa, the output of the first gran ,. The jMCTOpuoi-o key of the push-pull amplifier of pulses is connected to the input of the second one-oscillator of the master oscillator, the output of which is used as the second output of the master oscillator, the output of the second transistor JQ the push-pull pulse key switch is connected to the second input of the AND element, to the third input of which the trigger output is connected, to the input of which the output of the EXCLUSIVE OR element is connected. the first input of which is connected to the first input of the element I, and the second through an additional terminal is connected to the input of the rectifier. (rig 2 i t