SU1246283A1 - Device for pulse-phase control of rectifier converter - Google Patents

Abstract

The invention relates to electrical engineering and can be used to control valve converters. The purpose of the invention is to increase the accuracy for pulse-phase control of valve converters. The device contains a signal summation unit (UCC) 1, an integrator 2, a zero-body 3, a pulse shaper (PI) 4, a distributor 5, a block of pulse shaper amplifiers 6. The introduction of a capacitor 7 between the third input of the OSS 1 and the output of FI 4 allows destabilization -. factors do not affect the output parameter of the converter, i.e. It provides operation with wide fluctuations in the frequency of the alternating voltage. In addition, the device allows the use of the simplest driver circuits, 2 Il. i (Л 1С 4 О ISO 00 with

Description

The invention relates to electrical engineering and can be used to control dependent transducers.

The purpose of the invention is to increase the accuracy of a device for pulse-phase control of a valve converter.

Figure 1 shows the functional diagram of the device; figure 2 - diagrams of his work.

The device comprises a signal summing unit 1, an integrator 2, a zero-organ 3, a pulse shaper 4, a distributor 5 for m channels, a block of shaper amplifiers 6 pulses, a capacitor 7. One of the inputs of the summing node 1 is connected via a capacitor 7 to the pulse shaper 4 output . The feedback signal Up is sent to the other input of the summation node, and the third is the control signal 1),. The outputs of the driver formers 6 are designed for dp connections with control electrodes of converter gates

 Figure 2 shows: 8 is a diagram of a feedback signal U (output voltage and) and a control signal, and; 9 is the output voltage of the integrator 2; 10 is the output voltage of a null organ 3; 11 - output voltage of the pulse generator

UH device works as follows.

In the initial state, the integrator output voltage is zero, a constant control signal is supplied to one of the inputs of the signal summing node 1 (diagram 8, figure 2), to the other input - a feedback signal Voc to the capacitor 7, there is a voltage 1 of the polarity. At the moment of time, the shaper 4 generates a pulse (diagram 11, Fig. 2), which, summing up with Uoc and and,, enters the input of integratr 2, as a result of which the voltage at its input increases to a certain value. At time t, the pulse terminates and under the action of voltages, Uy, Uj, arriving at the input of the integrator, its output voltage decreases. At time t tj, the output voltage of the integrator becomes zero, due to 1246283

null-organ 3 (diagram 10, figure 2) and with its impulse it starts up the shaper 4. Thus, to

At the time point t, the circuit is in its original state and the process is repeated.

As can be seen from diagram 9 (Fig. 2), the change in the output voltage of the integrator during the period of operation T is zero, therefore, taking into account the polarity of the signals, we can write: t

i

I

f J №oc - u, + u, - u,), (1)

Where

T-,

Ub is the time constant of integrator 2;

the voltage at the output of the driver 4 pulses. Since in the steady state only a variable component of the current flows through the capacitor 7, the average value of the voltage over the period T is zero:

Yp i uc

to"

dt 0,

(2)

Oh

30 where R, is the input impedance of the sprm device. From the expressions (O and (2) it follows

what

(and.

J t

it.

(3)

those. the mean value of the feedback signal (Uo, c) is determined only by the value of the control signal Ui and does not depend on the duration of the period Tn, the integrator parameters included in Tn, and the parameters of the impulse and.

Thus, the proposed device improves the control accuracy, since destabilizing factors do not affect the output parameter.

converter At the same time, the functionality is expanded due to the operation of the device with wide fluctuations in the frequency of the alternating voltage of the converter, and the device is also simplified, since a driver circuit can be used as a pulse shaper.

Claims (1)

Invention Formula A device for and phase-pulse control of a valve-converter.of the device containing a summation node connected in series with three inputs, an integrator, a zero-body pulse generator, the outputs of which are intended to be connected to the control electrodes of the converter valves, the first the input of the summation node is intended to be connected to the source of the control signal, and its second input is to connect to the sensor of the output parameter of the converter, which is required in order to improve the accuracy, it is equipped with a capacitor connected between the third input of the summation node and the output of the pulse shaper. Oh t, Editor V. Petrash Compiled by O. Parfenova Tehred O. Sopko Proofreader V. But ha Order 4016/51 Circulation 631 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 Fmg 2