SU650205A1 - Device for shaping control signals of inverter power-diodes with common switching unit - Google Patents

Description

the cathode group stoppers, logic elements AND control of the anode and cathode valve group, two AND logic elements for controlling the dampers of the anode and cathode valve grounds and the trigger, with the trigger triggering their inputs to the input of the master oscillator, and the output for the first time logical inputs elements And to control the anode and cathode group, direct outputs of binary frequency dividers through the second inputs of elements And shapers are connected to the thyristors of the anode group, and inverse outputs of the binary divider Frequency And through the second inputs of the logic elements And and the drivers are connected to the thyristors of the cathode group, some AND INPUTS of the logical elements AND for controlling the quench valves are connected to the output of the master oscillator, the other inputs to the direct and inverse outputs of the binary frequency dividers, respectively, and the outputs to control electrodes for quenching the anode and cathode valve groups.

FIG. 1 shows a block diagram of the device corresponding to the isotre; in fig. 2 schematically shows an inverter; in fig. 3 - silnaly arising at the outputs of the device components.

The master oscillator 1 generates pulses with a frequency proportional to this voltage and is six times higher than the frequency of the three-phase network A, B, C. A trigger 2 is started by the pulse of the master oscillator which pauses.

The same pulses arrive at the ring counter 3. The counter makes B each required -period of a three-phase network A, B, C two recalculations. At its outputs arise, shown by iia of FIG. 3, signals. 4, 5 is a correction circuit for eliminating spurious signals at the output of the frequency dividers in connection with a possible violation of the mouth of the correct sequence of their operation.

The output of the ring counter is transmitted by three frequency dividers — triggers 6, 7, 8, which are switched with each incoming pulse, as a result, 6-Uf signals (Fig. 3) return to their outputs. These signals are fed to one of the inputs of the AND 9-14 logic elements. When signals are present at the other inputs of these elements, the formers of 15–20 control pulses will receive a signal with a duration equal to half the voltage period of the inverter.

The pulse-width modulation of the control output pulses is accomplished by removing the signal from the second inputs of elements 9-14 after each blanking pulse. Burst pulses are distributed over two channels using logic elements 21, 22. For the case when

the damping pulses are formed from the impulses of the master oscillator, the output control pulse will have three noises, which are equipped with a single vibrator. By adjusting the length of the pauses, the output voltage of the inverter can be changed.

The control pulses are stopped when a signal is received from the protection device by removing the signal from the inputs of logic elements used for this purpose.

The control outputs for the valves 29-34 (Fig. 2) are removed from the outputs of the device 23-28, and the quench impulses for the controlled inverter dampers 37, 38 are removed from the outputs 35, 36.

The control of the valves must be carried out in such a way that the voltage system at terminals A, B, C corresponds to the three-phase voltage system.

For example, consider the moment when the trigger 6 is switched to the state of "one", which corresponds to the switching on of the valve 29. In accordance with the circuit in FIG. 1 a quench pulse is generated at output 35, which corresponds to the quenching of the cathode group of inverter valves.

The introduction of logic elements favorably marks the proposed device for generating the ignition signals of the inverter valves from the known device, since it significantly widens the functional capabilities of the device without significant complications of the circuit.

Claims (1)

Invention Formula A device for generating control signals for an inverter valve with a common switching node, comprising a master oscillator connected to the input of a three-stage ring counter with three outputs, each of which is connected to a binary frequency breaker, having a direct and inverse output, and direct outputs through the drivers are connected to thyristors of the anode group of the inverter, and inverse through shapers - to thyristors of the cathode group, characterized in that, in order to extend the functionality, it is additionally supplied But with logic elements AND for controlling the anode and cathode valve group, two logic elements AND for controlling the dampers of the anode and cathode valve groups and the trigger, the trigger being connected to the input of the master oscillator by its inputs and the output to the first inputs of logic elements AND for controlling the anode and cathode group, the direct outputs of the binary frequency dividers, and the second inputs of the AND elements and the formers are connected to the thyristors of the anode group, and the inverse outputs of the binary frequency dividers through the second inputs of the logic elements And and the formers are connected to the thyristors of the cathode group, one inputs of the logical elements And for the control of the quench valves are connected to the output of the master oscillator, the other inputs to the direct and inverse outputs of the binary frequency dividers respectively, and the outputs to the control electrodes valve quenching anode and cathode valve groups. Sources of information taken into account in the examination 1 USSR author's certificate number 418945, "l. H 02 M 1/08, 16.02.72. 2Patent of Germany No. 1G13769, cl. H 02M 1/08, 01/17/68. - 0I 27 28  k APEU g