SU366539A1 - - Google Patents

Description

THE DEVICE OF MANAGEMENT OF THE THREE-PHASE RECTIFIER OF THE STATIC FREQUENCY CONVERTER

one

Control devices of a static frequency converter rectifier are known, which contain rectifying bridges fed through a transformer with high-frequency voltage and inverter, control driver drivers fed through a down-converter and synchronized with a network voltage.

The proposed device is characterized in that it is equipped with matching elements, the inputs of which are connected to the outputs of the rectifying bridges and control pulse formers, and the outputs of the elements of the matching elements are connected to the corresponding control electrodes of the rectifier valves.

This allows for improved device reliability.

FIG. Figure 1 shows the prinfipial diagram of one of the three identical channels of the device proposed; in fig. 2 - time diagram.

The primary winding of the transformer / (in Fig. 1 conventionally shows one rod) directly connected to the mains. The secondary winding 2 is connected to the input of a switching device 3 consisting of saturation 4 throttles, resistors 5 and 5, and differentiating chain 7.

The pulse shaper is a standby blocking generator 8, assembled in a push-pull circuit on transistors 9 and 10. These transistors are powered by alternating voltages removed from the windings // and 12 of the transformer 1, the collector voltages of transistors 9 and 10 being in protnofaz. Diodes 13 and 14 together with resistors 15 and 16 form a circuit of positive bias on the bases of transistors 9 and 10. To prevent the transistors from malfunctioning at the moments when the emitter-collector voltage becomes positive, the collector windings 17 and 18 are connected to traisistors through

diodes 19 and 20. The output windings 21 and 22 of the transformer 23 block generator through diodes 24 and 25 are connected to the inputs of the elements coincident (transistors 26 and 27) connected in the control electrodes of the valves 28 and 29 of the rectifier. Through diodes 30 and 31, the Traisistor 26 and 27 bases are connected to blocking generators installed in two other channels of the control system. Between e.mittera.p transnstorov 26 n 27 and cathodes

voltages 28 and 29 included rectifying outputs. L10STOV 32 and 33, the inputs of which are connected to the secondary windings of the output transformer 34 of the inverter 35.

The phase voltage of the network is supplied to

transformer. At the moment of droplet saturation 4 (30 ° relative to the primary voltage of the transformer), a short pulse is generated on the resistor 6, which triggers the blocking generator 8. The same emulsion (of opposite polarity) appears on the resistor 6 through 180 °. Blocking-generator produces two pulses, shifted relative to each other by 180 e. hail., and each of the pulses of one block-generator will be shifted relative to the corresponding impulse of another blocking generator by 120 e. hail. In general, the blocking generators produce a sequence of pulses of pulses that are shifted between themselves by 60 e. hail. The duration of the pulse is selected from the condition of reliable, unlocking of the reptile repellent. The pulses from the blocking generator through the output windings 21 and 22, the diodes 24 and 25 are knocked out to the bases of transistors 26 to 27. Through diodes 30 and 31 to the bases of transistors 26 and 27, the pulses from the blocking generators installed in the two other channels of the control system, so that at the base of each transistor there are two pulses, shifted by 60 el. hail. This is necessary for reliable switching of the current in the detector. The voltage taken from the inverter 35 n rectified bridges 32 and 33, applied between the emitters

transistors 26 and 27 and the cathodes of the valves 28 and 29. The control electrodes of the valves 2S and 29 are affected by single-pole high-frequency pulses for a time equal to the duration of the pulses generated by the block-generator-generator mn.

In the event of a breakdown of the inversion, the high-frequency arrangement disappears, and the control from the rectifier valves is removed, which causes its locking.

Subject invention

The control unit of the three-phase rectifier of the static frequency converter containing 1, its rectifying bridges, mounted through the transformer by high-frequency inverter, the drivers of control emulsions, driven through the low-voltage transformer and synchronized by the mains voltage, characterized in that, in order to improve reliability, it is equipped with elements of the assembly, to the inputs of which the outputs of the external bridges and drivers of control pulses are connected, and the outputs of the elements of coincidence are connected s with the appropriate control electrodes of the rectifier valves.

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