SU1663686A1 - Device for control and protection of thyristor - Google Patents

Device for control and protection of thyristor Download PDF

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Publication number
SU1663686A1
SU1663686A1 SU894684266A SU4684266A SU1663686A1 SU 1663686 A1 SU1663686 A1 SU 1663686A1 SU 894684266 A SU894684266 A SU 894684266A SU 4684266 A SU4684266 A SU 4684266A SU 1663686 A1 SU1663686 A1 SU 1663686A1
Authority
SU
USSR - Soviet Union
Prior art keywords
flip
flop
thyristor
additional
output
Prior art date
Application number
SU894684266A
Other languages
Russian (ru)
Inventor
Александр Васильевич Иванов
Михаил Михайлович Мульменко
Original Assignee
Уфимский авиационный институт им.Серго Орджоникидзе
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Уфимский авиационный институт им.Серго Орджоникидзе filed Critical Уфимский авиационный институт им.Серго Орджоникидзе
Priority to SU894684266A priority Critical patent/SU1663686A1/en
Application granted granted Critical
Publication of SU1663686A1 publication Critical patent/SU1663686A1/en

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Abstract

The invention relates to electrical engineering. The aim of the invention is to increase the reliability and enhancement of functionality by diagnosing gaps in switching on and failure of control circuits. If there is a skip of switching on of the thyristor 1 after the arrival of the pulse of the generator 7, then a high voltage continues to remain on the thyristor. At the same time, there is a single signal at the information input of the trigger 11, therefore a positive differential at the gate input of the trigger 11 translates it into a single state. As a result, the executive body of protection 10 is triggered, and the indicator 12 signals that the switch-on is skipped. 2 Il.

Description

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The thyristor control and protection device relates to power semiconductor technology and can be used in the protection and diagnostic systems of thyristor converters for electrotechnology and electrothermia.
The purpose of the invention is to increase the reliability and enhance the functionality of the device by monitoring and diagnosing the thyristor switch-in omissions and control circuit failures.
Figure 1 shows the functional diagram of the device; Fig. 2 shows timing diagrams of currents and voltages at the outputs of the elements (reference numerals are indicated in the corresponding diagrams).
The thyristor control and protection device 1 contains a sensor 2 voltage on the thyristor in the form of an optocoupler, whose input is connected to the power terminals of the thyristor 1 through a resistor 3 and is bridged by a reverse diode 4, and the output is connected to a power source through a resistor 5. The output of voltage sensor 2 also connected to the information input of the D-flip-flop 6, the gate input of which is connected to the output of the generator 7 rectangular control pulses connected to the input of the amplifier - shaper 8. The output of the flip-flop 6 is connected with the indicator 9 and the actuator 10 Protection, Additional D-flip-flop 11 with indicator .12 at the output of the information input is combined with the information input of the main D-flip-flop b, and the gate input of the flip-flop 11 is connected with the gate input of the flip-flop 6 through a logic inverter 13.
The device works as follows.
During normal operation, the thyristor 1 (Fig. 1) at the moment of time to the pulse of the generator 7, amplified by the amplifier-shaper 8, turns on the thyristor 1 and a current pulse passes through it, the form and duration of which are determined by the external power circuit of the thyristor. At the time ti, the gate input of the trigger 11 receives a positive dip, since at its information input at this moment a low voltage level, the forward output of the trigger 11 remains low, which corresponds to normal operation. A low level is also maintained at the inverse output of flip-flop 6 at the time t0, while both indicators 9 and 12 signal normal operation.
At time t2, the thyristor 1 is turned off, restored by the presence of reverse voltage on it. At the moment, the photodiode of the optocoupler 2 is turned on, and a high voltage level is supplied to the information inputs of the trigger 6 and 11. When the pulse from generator 7 arrives at ts, the processes are repeated, with the states of the flip-flops 6 and 11 unchanged.
If the thyristor is punched or spontaneously turned on due to insufficient recovery time (time t4, figure 2), then at the time ts of the arrival of the control pulse, the voltage on the thyristor is close to zero and the information inputs of the flip-flops 6 and 11 receive a low level signal, which causes the trigger 6 to switch to the zero state. On indicator 9
5, a single signal arrives, and it signals the thyristor 1 to turn on spontaneously. At the same time, the OR 14 element passes a signal to trigger the actuator 10 of the thyristor protection.
If the thyristor 1 skip occurs (Fig. 2), after a pulse arrives at t4 from generator 7, the thyristor continues to maintain a high voltage, while a single signal is present at the information input of the trigger 11 at ts, therefore a positive difference the gate input of the trigger 11 translates it into a single state,
0, as a result, the protection actuator 10 is triggered, and the indicator 12 signals that the switch-on is skipped. In this case, the indicator 9 does not receive a single signal, since the inverse output
5, trigger 6, voltage is kept low (there was no spontaneous switching on of the thyristor).

Claims (1)

  1. Apparatus of the Invention A device for monitoring and protection of a thyristor, equipped with a generator of rectangular control pulses, connected to a control electrode of the thyristor through an amplifier-driver of current thyristor control pulses,
    5 contains a voltage sensor on the thyristor in the form of an optocoupler, the output of which is connected to the information input of the main D-flip-flop, the gate input of which is intended to be connected to
    0 by the output of the generator of rectangular control pulses, and the inverse output is connected to the indicator, and the actuator protection, characterized in that, in order to increase reliability and expand functionality due to diagnostics of control gaps and control circuit failures, additional D is introduced into it - trigger, additional indicator, logical inverter and element OR, with informational input
    The additional D-flip-flop is combined with the information input of the main D-flip-flop, the gate input of the additional D-flip-flop is connected to the gate of the D-flip-flop connected to an additional indicator, while the inverse output of the main D-flip-flop and the direct output of the additional D-flip-flop
    the home of the main D-flip-flop is connected via logical 5 OR to the input of the executive inverter, and the direct output of the additional protection body.
    Normal work
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    D-flip-flop is connected with an additional indicator, while the inverse output of the main D-flip-flop and the direct output of the additional D-flip-flop through the element
    t
    t
    t t
    t t
SU894684266A 1989-05-03 1989-05-03 Device for control and protection of thyristor SU1663686A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SU894684266A SU1663686A1 (en) 1989-05-03 1989-05-03 Device for control and protection of thyristor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU894684266A SU1663686A1 (en) 1989-05-03 1989-05-03 Device for control and protection of thyristor

Publications (1)

Publication Number Publication Date
SU1663686A1 true SU1663686A1 (en) 1991-07-15

Family

ID=21444278

Family Applications (1)

Application Number Title Priority Date Filing Date
SU894684266A SU1663686A1 (en) 1989-05-03 1989-05-03 Device for control and protection of thyristor

Country Status (1)

Country Link
SU (1) SU1663686A1 (en)

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Патент Швеции № 365915, кл. Н02М 1/18, 1972. Авторское свидетельство СССР № 1319156, кл. Н 02 Н 7/12, 1986. *

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