SU452907A1 - A device for generating control pulses for an α-phase converter - Google Patents

Description

I

 The invention relates to the field of electrical engineering, in particular to the field of control of high-voltage converters.

Known control systems for the power converter are implemented according to a second pripipu. Control devices affect the source of primary pulses, which generates primary control pulses shifted in phase in a given control zone, the outputs of the source of primary pulses, the number of which is determined by the number of arms of the converter, are connected to an amplifier of control pulses, which in turn, through a channel consisting of isolating transformers or t fibers, pulses are fed to the grid nodes of high-voltage gates.

An amplifier having a number of channels equal to the number of shoulders of the valve converter and containing key devices is usually performed. so that the next impulse turns on the key device, and the impulse is next igni

for example, through 36O el. hail

iero and includes the following key device, and so on in a closed loop.

Pulses from the outputs of two adjacent key devices (duration, for example, 60 e. Deg.) Are summed and J are fed through isolating channels to the grid nodes of high voltage gates as a pulse with a duration of 12 o e. hail. Therefore, if, after turning off the first key device of the amplifier, an extraordinary pulse arrives at its input, the first key device is switched on again, as a result of which one of the control signals will be additionally extended to 180 e. hail ;, which will cause the valve converter to overturn if it is operating in inverter mode. Extraordinary pulses are generated at the moments of occurrence of the resulting control signal, for example, when the minimum current regulator is operating, due to the rapid change of current in the windings of the summing magnetic element. - peak transformer. In addition, additional pulses can have I

place at the double crossing of the resultant adjustment signal with a reference voltage, for example, of a triangular shape, using an adder of any current.

In the case of installation of an amplifier of powerful grid pulses at the potential of a valve controlled via an electromagnetic or light channel, consideration should also be given to the presence of pulses that can penetrate the input of this amplifier and turn it on again immediately after the next pulse is applied.

The difference of the invention is that the base of the transistor is connected to the corresponding auxiliary output of the source of primary pulses through the logical element NOT.

This makes it possible to increase the noise immunity of the device for generating control pulses.

FIG. Figure 1 shows a schematic of an arrangement for generating control pulses; in fig. 2 a, b, c, d, e - diagrams illustrating his work.

A device for generating control pulses for a T-phase converter contains a source 1 of primary pulses, having main outputs 2-7 and auxiliary outputs 8-13, causing the control zones (Fig. 2). A blocking element 14, made in the form of three parallel branches containing a resistor 15, a storage capacitor 16, diodes 17 and 18, a thyristor 19, a 2 O transistor and a power source 21, is connected in series with each of the main outputs.

In the base of the transistor 20 is included a logical element HE 22.

The device works in the following way.

When the control pulse element 14 appears at the input in the control zone (see Fig. 2a, b), an output pulse appears at the output of the element 14 (Fig. 2b). However, as the capacitor 16 is charged, the thyristor 19 is opened through the resistor 15, and the input is shunted through the diode 17. At the same time, the output pulse is terminated. Through thyristor

current begins to flow (Fig. 2c). After the input pulse disappears, TIR # 19 is kept in the open state by the voltage from the NIN 21 source to the same closes the input

in conjunction with diode 17 for positive voltage. At the end of the control zone, the transistor 20 is turned on when the voltage is applied to its base through the element HE 22. Thus, the output of the amplifier 14 continues to be short-circuited for positive voltage. For negative voltage, there is a circuit through the diode. Iii); .-Transistor 20 right & is in a good condition to t. - the beginning of the regulation zone. After

what it closes, so that the unlocking voltage coming from the output of the element HE is removed from its base. As a result, the device is prepared for re-operation in a given control zone.

Subject invention

A device for generating pulses for a t-different converter, containing a source of primary pulses with 2 m auxiliary outputs causing control zones and 2 w main outputs, in series with each of which a corresponding blocking element is made, in the form of three parallel circuits, one of which consists of a series-connected resistor and a capacitor, the other one of a series-connected diode and a thyristor, and a third of a counter-connected diode, and the control The thyristor junction is connected to the coupler's point of the resistor and the wrenchator, its kAT00 is connected to the emitter, and the anode is connected to the collector of the transistor, which is connected to a constant voltage source through another resistor, characterized in that with the corresponding auxiliary output of the source of primary pulses through the logical element NOT. -

FIG. I 13