SU1504750A1 - Device for controlling thyristors - Google Patents

Abstract

The invention relates to contactless switching equipment made on thyristors and can be used as a driver of control signals. The aim of the invention is to simplify the device and increase efficiency. In the initial state, the capacitors 16 and 17 are charged from the power supply unit 13 by means of resonant circuits including inductors 9, 10 and thyristors 5, 6 up to a voltage higher than the voltage of the power source 13. After switching on the thyristors 1, 2 capacitors 16 and 17 are discharged to the primary winding 21. Moreover, capacitor 17 forms a pulse duration, and capacitor 16 forms a front. During the discharge period of the capacitors 16 and 17, the capacitors of the other arm 18 and 19 are charged from the resonant circuits from the inductors 11, 12 and the thyristors 7, 8 and when the discharge thyristors 3 and 4 are turned on, the pulse in the winding 21 is similarly formed. each of the arms of the device. 2 Il.

Description

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The invention relates to contactless switching equipment, made on thyristors, and can be used as a form-generator of control signals.

The purpose of the invention is to simplify the device and increase efficiency.

FIG. 1 shows a diagram of the proposed device; in fig. 2 - diagrams on the operation of the device.

The device contains discharge thyristors 1–4, connected in pairs by cathodes, charging thyristors 5–8, connected by cathodes with anodes of the corresponding discharge resistors, and anodes through inductors 9–12, respectively, with leads X and Y of power supply units 13 and 14, thyristor control electrodes 8 are connected to the terminals of the source of 15 triggering pulses, capacitors 16-1, one terminals of capacitors 16 and 17 are connected to the negative terminal of block 13, and terminals of capacitors 18 and 19 to the negative terminal of block 14, other terminals of capacitors 16 19 seconds unified with the anodes of the thyristors 1-4, respectively, wherein C 17,

(6 - n (C, cable-transformer system. 20 distribution of control pulses, one output of the primary winding 2 which is connected to one of the terminals of capacitors 16 and 17 and the cathodes of thyristors 3 and 4, the other output - to one of the terminals of 18) and 19 and the thyristor cathodes 1 and 2, the secondary windings 22 and 23 through the corresponding rectifier bridges 24 and 25 are intended to be connected to the balanced thyristors.

The device works as follows.

Signals 1G from r coming from the source 15 of trigger pulses, the controls (Fig. 2) are applied simultaneously to charge thyristors 5 and 6. Due to the presence of coils

9 and 10 inductances. The process of charging capacitors 16 and 17 from power supply unit 13 is of a resonant nature.

Capacitors 16 and 17 are charged to voltages greater than the voltage.

and ,, power supply unit 13, to ensure that P (1

It is faster and more reliable to lock the charging thyristors 5 and 6. If the control signals and. are simultaneously applied to the discharge thyristors 1 and 2, the thyristor 1 turns on first, because the charge voltage of the capacitor 16 is higher than that of the capacitor 17. Discharging the capacitor 16 will form in the primary winding 21 a short current pulse i-i-fsC of large amplitude and rate of rise. As soon as the voltages on the capacitors 16 and 17 are equal in magnitude, the thyristor 2 is turned on as its control signal continues to operate. The thyristor I is closed under the influence of the blocking voltage on the capacitor 17. The capacitor 17, discharged through the primary winding 21, will form in it a current pulse i

21-p

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duration, since C,., 77 C.

The second half of the device operates in the same way, however, when in one -3 of the halves of the device the forming capacitors are charged, in the other a control signal is formed by a cable-transformer system, signals 1 / JJ are generated on the secondary windings 22 and 23. The intermittent turn-on of shapers ensures the operation of the cores of pulse transformers along a symmetrical hysteresis cycle, and also allows the use of one primary winding of a cable-transformer system, which significantly forgiving design of the primary winding (in particular its insulation)

The device can be used to control a large number of series-parallel connected thyristors.

Accelerated charging of capacitors and restoring the circuit to the initial state increases the device efficiency by 25%, and using one cable (primary winding of transformers) reduces the cost of a cable-transformer system by 30%.

Claims (1)

Invention Formula A device for controlling thyristors containing two power supply units, four discharge thyristors connected in pairs by cathodes, a source of triggering pulses, the first and second outputs of which are connected to control electrodes of the discharge thyristors of the first pair, the third and fourth outputs - to control electrodes discharge thyristors of the second pair, four capacitors, one terminals of the first and second capacitors are connected to the common negative terminal of the first power supply unit, the other terminals of each of them are connected to the anode of the corresponding discharge thyristor of the first pair, some of the third and fourth capacitors are connected to common negative power supply of the second power supply unit, the other output of each of them - with the anode of the corresponding discharge thyristor of the second power unit is connected to the positive leads X and Y, respectively, of the first block supply, where Y, V Y cathodes directly connected to the anodes of the first and second discharge thyristors of the first pair, respectively, and the control electrodes to the first additional output of the source of trigger pulses, the anodes of the third and fourth charging thyristors through the corresponding inductors connected to the positive leads X, (and cable, transformer system-j5 g of the second power unit, and ten Distribution of control pulses with output rectifier bridges, characterized in that, in order to simplify the device and increase efficiency, four charging thyristors and four inductors are inserted into it, and the source of trigger pulses is equipped with two additional outputs a transformer control pulse distribution system is made with one primary winding, the anodes of the first and second charging thyristors through the first connected to the positive leads X and Y / respectively of the first power supply, where Y, V Y cathodes directly j5 ten   C A- ,, v. In addition, the cathodes are directly connected to the anodes of the corresponding discharge thyristors of the second pair, the control electrodes — with the second additional output of the source of the triggering pulses, one output of the primary winding of the cable-transport system of the distribution of the control pulses thyristors of the second pair, another output - with one of the outputs of the third and fourth capacitors and cathodes of the discharge and the second inductance coil of the corresponding thyristors of the first pair. fff.f n. ffsf.2 U, 7.U4 If, it, iff-fS Jzl