SU972415A1 - Device for checking frequency thyristor converter control circuits - Google Patents

Description

(54) DEVICE FOR CONTROL OF CONTROL DIAGRAMS OF THYRISTOR TRANSMITTERS

one

The invention relates to an optical measuring technique and can be used in the diagnosis of thyristor frequency converters.

It is known a device dp of control of pulse continuity, which contains control and memory triggers and three coincidence circuits, connected in such a way that allows a series of consecutive pulses going uninterruptedly to monitor the appearance of each pulse at a certain time and from them, issue a malfunction signal.

The disadvantage of this device is the small functionality, which consists in the fact that the monitoring of the pulses of a certain single-channel device requires additional synchronization pulses.

The closest in technical essence to the present invention is the device DP of the control of the sequence of pulses consisting of triggers, forming a FREQUENCY

The shift register, the input logic, connecting the triggers between themselves and controlled by the signals of a controlled sequence, and the comparison unit 2J.

The disadvantage of the known device is that it detects: "only single errors in the monitored sequence of pulses are detected; they do not detect multiple errors.

The circuit of the invention is to increase the reliability of the control.

The delivered chain is achieved by

Claims (2)

15 that in the device containing the triggers connected between each other through the input logic elements And to the shift register unit, and the output element AND, the number of triggers of the shift register unit is increased. an additional trigger, the input of the perektocheni trigger is connected to the output of the first input Epicheitis I, and its outputs are connected to the control inputs of the first input logic element And and the additional input input element And whose main inputs are connected to the first input of the control side, the output of the latter is connected to the inputs of an additional trigger, the outputs of which are connected to the inputs of the output logic element And and the input logic element And the subsequent trigger of the register connected by an inverted output to another output output logic element I. FIG. 1 shows a functional diagram of the device; in fig. 2 - time diagrams. The device contains triggers 1, 3, .., y, forming the shift register, input logic elements And And + 1,, .. ,, 2k | To which the input is received, the signals of the signal C,, digest the 1st trigger 2y + 1, the trigger trigger 2ts + 2, the additional input logic And 2i + 3, the output logic element And 2n + 4. The device works as follows. The initial setup signal (Fig. 26) sets all the triggers to the initial position, this happens at an arbitrary time bd. At time point bx | I when a pulse C (FIG. 2, a) appears at the first input of the trigger device 1 (FIG. 2 in.) Enters state 1, thereby allowing the passage of the C-x pulse through the input logic element AND AND + 2 to the trigger input 2 On the falling edge of the pulse C, the switching trigger 2U1 + 2 goes to the state O (Fig. 2d). At the time moment -Ll, the signal C (Fig. 2, a.2) appears at the second input of the device and translates trigger 2 into the state (Fig. 2, I), which will allow the passage of pulse C through the input logic element And AND + 3 at the input of the trigger 3 and so on (the input signals C, ..., C j are shown in Fig. 2, a, ..., flj, and the state of the triggers 3, ..., i is shown in Fig. 2c 3, ..., vp). If there were no gaps or 1 change in the order of followings in a controlled sequence, then by the time moment -t when another succession C is received at the first input of the device, the last trigger of the register U) will be in state 1, and the additional trigger at the moment time t will go to 1 ° state (Fig. 2 (:, since the switching trigger 2 | a + 2 will pass a pulse through the additional input logic element AND 2h + 3 to the input of the 2 p + 1 triggering trigger. The last signal from its inverse output will close the input lo And 2j of the last trigger and register, and also sends a logical signal to one of the inputs of output 2 and 2. 2. The second input of which is connected to the inverse output of trigger I. The absence of a logical 1 signal at the output of the output element of And 2vi + 4 witnesses There is no disturbance in the controlled pulse sequence. After the moment of time, the input signals can no longer change the state of the trigger that determines the result of the control. Thus, the monitoring is performed during only one period of the monitored sequence of pulses (from the time point b) to −b). The proposed device allows quick detection of a faulty transducer control unit. Claims of the Invention Device For controlling thyristor frequency converter control circuits comprising triggers interconnected via input logic elements And into a shift register unit, and an output element differing from the fact that, in order to increase the control accuracy, the number of shift register trigger blocks increased Up to the number of channels monitored, a switching trigger was added to the device, an additional logical input And And an additional trigger, with the switching trigger input connected to the first input logic element I and its outputs are connected to the control inputs of the first input logic element I and the additional input logic element H, the main inputs of which are connected to the first input of the control unit, the output of the secondary element is connected to the input of the additional trigger, the outputs of which are connected to the inputs output pogic element: And and input logical epema and AND a trigger trigger register connected by an inverse output to another input of the output pogic element I. Sources of information taken into account in the examination 1 „USSR Author's Certificate No. 374691, kp. G 01 R 31/28, 1971. 2. USSR author's certificate number 374558, CP. Q O1 5 31/28, 1974 (prototype). Beg (/ cmaHff / fa figure 1