SU1224919A1 - Generator of thyristor control pulses - Google Patents

Abstract

The invention is intended to form thyristor control pulses. The purpose of the invention is to increase the reliability and improve the overall dimensions. The device contains a control unit 1, a two-pole pulse amplifier (DIU) 5, a pulse transformer 9, as well as the additionally introduced two pulse extender (CI) 6.7, two diodes 8 and a two-winding relay 4 with magnetic memory. The output of DIU 5 is connected to the primary winding of the transformer 9, the secondary windings of which through diode 10 are connected to the control inputs of the thyristors 11. The inputs RI 6.7 are connected through oppositely connected diodes 8 to the primary winding of the transformer 9. The outputs RI 6,7 are connected to the corresponding windings relay 4. Inputs DIU 5 through the opening and closing contacts of the relay 4 are connected to the output of the control unit 1. A reactor 20 is connected to the thyristors 11. The device ensures the exclusion of the passage of control pulses of the same polarity when the device is turned on after it is turned off, and it eliminates the operation of the transformer 9 through the partial re-magnetization cycle. This achieves the goal. 1 il. i (Л С ю rsD 4 СО СО Г JL V 7 L

Description

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This invention relates to electrical engineering and can be used in current type transducers.

The aim of the invention is to increase the reliability and improve the weight and size characteristics.

The drawing shows a diagram of the device.

Control unit 1 has two galvanically isolated outputs and is connected to pins 2 and 3 of relay 4, which has two windings, the second pins of pins 2 and 3, and the second pins of outputs of block 1 are connected to a two-pole impulse amplifier 5, the output of which is connected to the inputs of the expanders 6, 7 and pulses through the diodes 8 and to the transformer 9 whose secondary windings through the diodes 10 are connected to the control inputs of the thyristors 11, the outputs of the expanders 6 and 7 are connected to the windings of the relay; 4. Amplifier 5 contains resistors 12 and 13, transistors 14 and 15, diodes 16, 17 and two power supplies 18 and 19. Reactor 2 is connected to thyristors 11

The device works as follows.

Thyristors 11 and reactor 20 are part of a current converter device, for example, a mittel, inverter, or AC voltage regulator. To regulate the magnitude of the current of this power device, the control unit 1 generates two control pulses with a specific phase, which are spaced between each other for 10 ms (at a network frequency of 50 Hz).

This impulse, passing through pins 2 and 3, is amplified by an amplifier 5 pulses, which feeds them to transformer 9, which is galvanically separated. After being rectified by diodes 10, pulses are applied to thyristors 11.

In the working state of the device, pulses of different polarity are alternately fed to the transformer 8, which ensures the operation (remagnetization) of the transformer over the full cycle, in which its magnetic core is used optimally, and therefore the maximum value of pulses supplied to the thyristors 11 is reached. The nonlinear reactor 20 in the gross part of the converter also works optimally. However, after turning off the device from operation and Follow-up; after the rest 5

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Your turn on may be followed twice twice (with a pause) pulses of the same polarity. . In this case, the magnetic systems of the transformer 9 and the reactor 20 have residual magnetization and the first. After switching on the pulse at the output of the transformer would be lower. The inductance and time during the Q of the reactor support 20 would also decrease. This would reduce the reliability of the device and require would increase the mass of the transformer 9 and the reactor 20,

In this case, this is not required due to the fact that during the passage of the next pulse through the transformer 3, depending on the polarity of this pulse, the expander 6 or 7, which generates at its output a pulse of the corresponding polarity with a duration of several milliseconds, is less than relay time 4.

2J For this, extenders 6 and 7 can be performed on active elements (such as a single vibrator) or on the basis of passive circuits. The response time of the relay, depending on the type, is within 2-5 ms. Formers B or 7 cause the relay 4 to switch from one stable position to another. At the same time, the previously closed contact 2 or 3 is broken, thus breaking the channel of passage 30

a pulse of this polarity, and contact 3 or 2 is closed, thus preparing a channel for the passage of a pulse of another polarity. Thus, after each pulse, relay 4 changes its position.

After switching off the device, relay 4 can maintain its position for a long time. So for reed relays, the storage time of the memory exceeds 10,000 hours.

After the device is put into operation, always the first will pass an impulse of that polarity which is opposite to the polarity of the last impulse before opening MS

The relay time is 2-5 ms, which is less than the time interval between pulses. However, in some

In cases of this, the rate of change of the control pulse phase is limited. Therefore, the device is intended primarily for converters operating in static modes.

Thus, the proposed device provides a strict sequence of pulses, despite its shutdown for an indefinite time.

Due to this, the required magnitude of the control pulse is ensured, since the operation of the pulse transformer 9 in the partial reversal cycle is completely excluded. The latter refers to the i-power nonlinear reactor 20, which includes to limit the rate of increase of the NIN current. Therefore, a strict regulation of the mode of operation of the fans is achieved, which increases the reliability of the device. In this case, it is not necessary to calculate the transformer 8; and the reactor 20 to operate in a private cycle, which reduces their weight and dimensions at least twice.

Claims (1)

Invention Formula Thyristor pulse shaper, containing two editors N. Gorvat Compiled by S. Luzanov Tehred I.Popovich Proofreader M. Demchik Order 1959/54 Edition 631 Subscription VIIIPI State Committee of the USSR for inventions and discoveries 113033, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Directly two-input pulse amplifier, the output of which is connected to the primary winding of a pulse transformer, secondary windings 5 of which, through diodes, are intended to be connected to thyristor control electrodes, characterized in that, in order to increase reliability and improve overall dimensions, it is equipped with two additional diodes, two pulse extenders, and a magnetic two-winding relay with opening and closing 15 contacts, the inputs of the pulse expanders through oppositely connected diodes are connected to the primary winding of the pulse transformer, and their outputs are connected to the corresponding windings of two a magnetic winding relay with magnetic memory, through the opening and closing contacts of which the inputs of a two-pole pulse amplifier are connected to 25 pins for connection to the corresponding outputs of the control unit VIS.