SU728207A1 - Device for single channel phase controlling of gated converter - Google Patents

Description

The invention relates to the field of pre-operative technology and is designed for multi-phase static power converters mainly in high-precision high-speed direct-current electric drives, for example, in electric flow drives of modern machine tools with programmed control, in dynamic models of dynamic modeling stands, in electric pullers of dynamic robots tori etc. It is known a single-channel (}) device for the control of valve converters containing a driver for phase synchronization impulses A, a phase shifter whose output is connected to the valve control circuits of all phases, and the valves A of the phases A are connected directly to the output of the phase shifter , and the valves of phases B and C - through the appropriate time delay devices lJ. However, such a device has low speeds due to the delay introduced by time delay devices in phases B and C. The closest to the technical essence of the present invention is a device containing a synchronization of a sequence of impulses tied to the phasic voltage; a common base generator (for example, a sawtooth) voltage; a reference voltage comparison authority with a control signal; a driver of control pulses and a phase distribution circuit. Moreover, all elements are connected in series in the specified order 2. A disadvantage of such a device is the limited range of control of the valve unlocking angles. It provides for drapasone regulation; Unlock angles of the valve. No more than 36O / h1 electrical grad. (where m is the number of phases), m, e, does not provide for overlapping of the ranges for adjusting the valve unlocking angles (|) az. So, for example, when working three-

a phase controlled rectifier to the direct current oscillator; all its operation modes require a miana area to adjust the angles from the valves of each phase, equal to 180 el.grad. Thus, the adjustment ranges of all phases should overlap on the electrical grids.

The purpose of the present invention is to expand the range of adjusting the angle of valve unlocking.

This goal is achieved by the fact that, in a double-sided phase control device, the valve preoolators have a synchronizer, a reference voltage generator, the output of which and the output of the control signal source are connected to the qDraHa inputs of the comparison, and its code through the control pulse generator of the distribution circuit in phases, two RS-triggers with clocked S-inputs are introduced, two coincidence circuits and, in addition, the synchronizer is provided with a channel for the formation of auxiliary pulses, and the sapper voltage generator - dopolnitel.nsm input synchronization. At the same time, the first synchronizer output is connected to the R-input of the first trigger house, with the 5 input of the second trigger and with one of the first match, the other input of which I is connected to the Q input of the first trigger, and the Q output of this t {igger connected with T-input of the second trigger. The output of the entered synchronizer channel is connected with T1-input of the second trigger and with one of the inputs of the second circuit are the same, the other input of which is connected to the Q-terminal of the second trigger, and the Q-output of this trigger is connected to the T-input of the first trigger. In addition, the outputs of the coincidence circuits are connected to the inputs of the reference voltage generator, and the 5-input of the first trigger is connected to the output of the controller of the control pulses.

The essence of the proposed invention is illustrated by the example of a control device for a three-phase power static 1 1 converter with a range of adjusting the angle of valve unlocking in phases equal to 180 el.grad.

FIG. 1 is a schematic diagram of the device; in fig. 2 (a, b, c, d, d, e, g, 3, and, k, ... p) are diagrams that explain its work.

. The device contained a synchronizer 1 with two outputs of synchronization pulses (A and B respectively), two

S-flip-flops 2 and 3 with clocked S inputs, two cxoMi.i coincidences 4 and S, a reference saw generator 6, which includes two separation diodes 7 and 8, forming the output synchronization circuits, working capacitor 9 and current source 10 ; 11, the source of the Control Signal 12, the driver of the control pulses 13 and the distribution circuit of the control pulses 14.

The device works as follows.

Comparison body 11 compares the signal of the control source 12 with the operative sawtooth voltage of the generator 6, which is formed on the working capacitor 9 by discharging it with a CONSTANT current of the source 10. At the time of equality with the control signal, and. the reference voltage of the comparator unit 11 changes its state, and the driver 13 generates a control pulse of a predetermined duration (Fig. 2d, g). The working capacitor 9 is charged by dividing diodes 7 and 8 either by pulses from the output A of synchronizer 1 through a coincidence circuit 4, or by pulses from the output B. through the coincidence circuit 5 as a function of the temporal position of the control pulses from the former 13 relative to the overlapped portions of the ranges of control of the valve unlocking angles. With control signals equal to zero or less than a certain value, the charge of the working capacitor 9 is effected by pulses from the output B of the synchronizer, and for large signals by the pulses from output A. Thanks to this, for small control signals, there is no overlap in the saw, for large angles, the valves are unlocked, and for large signals, the overlapped area corresponding to small angles for unlocking (Fig. 2). The synchronizer pulses 1 with the codes A and B correspond to the beginnings and ends of the control ranges for unlocking the angles of all phases, which in this case coincide with the natural ignition points of the positive and negative half-waves of the network voltage (Fig. 2a, b, c).

Claims (1)

The control of the charging circuit of the working capacitor 9 is carried out using two triggers 2 and 3 and two coincidence circuits .. 4 and 5 as follows. When the control signal Uy O is pa during the course of source 12 (FIG. 1), there are no pulses at the output of shaper 1.3 (FIG. 2 d, e). In this case, the trigger 2 will be in the zero state (Q O, Fig. 2 g, e) which is confirmed by the pulses from the output A of the synchronizer 1, arriving. on the T1-way (zero input) of this trigger. The trigger 3 will generate pulses corresponding to the overlapping parts of the control ranges (Fig. 2k), moving to zero state when the pulse arrives at the R input (zero) from output B of synchronizer 1 and into one state when the pulse arrives the input S from synchronizer 1 (on the T-input of this trigger acts on the logical unit from the Q-output of trigger 2) acts on the tactically S input - figs, 2 a, and, k, l. i As a result, the zero signal from the Q-output of trigger 2, acting at the input of the coincidence circuit 4, prohibits the passage of pulses from synchronizer 1 to the charge of the working capacitor 9, and the impulse from С | the outputs of the trigger 3, which enter the input of the coincidence circuit S, permit the passage of the synchronization pulses 1 to the charge of the working capacitor (Fig. m, n, d). When and f o the shaper 13 generates pulses at the moment of equality of the control signal and the rush voltage (fig. 2 g, d). If the belt position of this pulse arriving at the S-input of the trigger 2 coincides with the overlapped area; control ranges (the signal from the Q output of the trigger 3 supplied to the T input of the trigger 2), the trigger 2 continues to remain in the zero state (Fig. 2 v, g, h), and the charge of the working capacitor 9 is reused still pulses with the stroke A of synchronizer 1 (Fig. 2 g, m). If the temporal position of the impulses from the driver 13 does not coincide with the overlapped portion of the control ranges, then the trigger 2 is transferred by this pulse to one state (Fig. 2e, g), and by the pulse from the output A of synchronizer 1 to the zero state (Fig. . 2 g). The trigger 3 will then be in the zero state, since the pulses from the output A of synchronizer 1 on the clock S input of the trigger 3 will not coincide with the signal of the Q output of trigger 2, and the pulses from the output B of the synchronizer coming to the K-code of this the trigger will confirm the zero state of the trigger (Fig.2 and, k, l). As a result, the charge of the working condenser 9 will be carried out by impulses from the output A of the synchronizer through a coincidence circuit 4 (Fig. 2, n, the charging parameters of the generator circuits are adjusted so that the onqpHoro voltage forward voltage in both cases x coincided with the required forward stroke (dotted line in Fig. 2 g), which reflects the required range, adjusting the opening angle of the valves of all phases. The adjustment is made by matching the amplitudes of the pulses with the 4 and 5 coincidence circuits and the source current 1O (Fig. 1 ). Thus The proposed device makes it possible to obtain virtually any range of adjustment of the angles of unlocking the valves of all phases, completely to overlap. Claims A device for single-channel phase control of valve converters containing synchronization, a reference voltage generator, the output of which and the output of the control signal source are connected to the inputs comparator, and its output through the driver of control pulses to the input of the phase distribution circuit, characterized in that, in order to expand valve opening angle control ranges, two RS-flip-flops with clocked 5 inputs are entered into it, two coincidence circuits and, in addition, the synchronizer is equipped with a channel for generating auxiliary pulses, and the reference voltage generator is connected to the first synchronizer output with the C-input of the first trigger, with the S input of the second trigger and with one of the inputs of the first match circuit, the other input of which is connected to the output of the first trigger, and the Q output of this trigger is connected to the T input of volts the same trigger, the output of the input channel of the synchronizer is connected to the K input of the second trigger and one of the inputs of the second coincidence circuit, the rear input of which is connected to the Q output of the second trigger, and the Q output of this trigger is connected to the T trigger of the first trigger, except In addition, the outputs of the matching voltage generator of the reference voltage generator, and the S-output of the first trigger - to the output of the trigger conditioner - to the output of the actuator, .c, control pulses. Sources of information taken into account at the expert i. cisato D .. MaHam L., mpoved SCP. Firing C rcniiS. Eeectronic E. ivieerin l965. 37.146. 2. USSR certificate № 125605, cl. H 02 R 13/16; 02 M 1/08 (prototosh). unnyfbC