SU1034133A1 - Triac trigger pulse shaper - Google Patents

Abstract

FORMER OF PULSES STARTER TRAY, containing a network synchronization unit, whose code is connected to the synchronized input of the first D-flip-flop, the setup input of which is connected to the inverted output of the second 6-flip-flop, the setting input of which is connected to the input terminal, gated generator, the output of which is connected to the programmed output of which is connected to the input terminal, gated generator, the output of which is connected to the programmed output of which is connected to the input terminal, gated generator, the output of which is connected to the program. the input of the counter, the installation input of the Kotorogb is connected to the output of the first B-flip-flop, a. information input - with information terminals, output terminal,: B-inputs of D-flip-flops are connected to a zero-level source, which is so that, in order to improve the accuracy and plausivity of the device; it is equipped with an additional generator that is being shocked, the output of the additional gated generator is connected to the output terminal, and the input of the gating is connected to the direct output of the first D trigger, the inverse output of which is connected to the synchronizing input of the second G-generator . from 4 to 00

Description

The invention relates to a conversion technique and can be used in electrical and automation devices for switching sensible C-thyristor and thyristor executive elements.

A device for pulse-phase control of a thyristor transducer is known, comprising a power synchronization unit, a trigger, an AND element, a clock reHepaiTop, a cosine function generator, an equilibrium unit, a delay element, and a pulse pulse forcing device.

The drawbacks of the device are the low reliability and accuracy of the Regulation and the functional complexity of the device.

The closest to the proposed technical entity is a trigger generator of a triac that contains a network synchronization unit, the output of which is connected to the synchronization input of the first D-flip-flop, the installation input of which is connected to the inverse output of the second D-flip-flop, the installation input of the second D-flip-flop is connected to input terminal, gated generator, the output of which is; It is connected to the meter reading input, the installation input of which is connected to the direct output of the first trigger, and the information input to the information terminals, output terminal C23.

The drawbacks of the device are low accuracy and reliability, due to the lack of synchronization of the generator and criticality to the duration of the pulse of the device to return to its initial state.

The purpose of the invention is to improve the accuracy of the formation of pauses, increase the reliability of the triac start and ensure reliable return of the Shaper to its original state, regardless of the duration of the return pulse. .

The goal is achieved by the fact that the trigger generator of the triac containing the network synchronization unit, the output of which is connected to the synchronization input of the first O-trigger, the installation input of which is connected to the inverse output of the Vaner-Trigger, the installation input of the second D-trigger connected to the input terminal , a gated generator, the outcropping of which is connected to the subtractive input of the counter, whose installation input is connected to the direct output of the first D trigger, and the information input to the information terminals 1mi, output terminal, equipped with an additional gated generator, and. the output of the additional gated generator is connected to the output

the terminal and the gating input - with the direct output of the first D-flip-flop, the inverse output of which is connected to the gating input of the main gated generator, the output of the counter is connected to the synchronizing input of the second D-flip-flop.

FIG. 1 is a schematic diagram of a triac trigger pulse driver, FIG. 2 - timing diagrams explaining his work, where U.- voltage in the network U voltage in the load; t (n) is long. there is a pause.

Trigger pulse generator Triac contains input terminal 1 for connecting an external control signal source, D-triggers 2 and 3, network synchronization unit 4, gated generator 5, counter 6 and gated generator 7, output terminal 8 and information terminals for connecting the control source N code

The pulse shaper operates as follows.

In the initial state, the input terminal 1 (Fig. 1), which is connected to the set S input of the O-flip-flop 2, receives a logical zero, the .D-flip-flop

2 is in the zero state, i.e. from its inverse output to the setup S-input of the O-flip-flop 3 a logical unit arrives, holding the D-flip-flop 3 in the set

in unit state. In this case, the logic unit from the direct output of the B-flip-flop 3 enters the gate input of the generator 7, allowing the latter to generate pulses arriving at the output terminal 8 of the driver.

in addition, the signal of the logical unit from the direct output of the trigger

3Poste to the installation input of the counter b, keeping the latter in the state specified by the code N, arriving at the information terminals of the counter b.

Thus, D-flip-flop 2 can change its state only by affecting its S-input. D-trigger 3 does not perceive information on the D- and C-inputs, since it is held by the unit on the setting S-input, hence j The driver is stable and the device will remain there until the control signal Sfig arrives at the input terminal 1. 2

When a single pulse arrives at the input terminal 1, D-flip-flop 2 is set to one, i.e. from its inverse output, the logical zero arrives at the S-input) -Trigger 3, freeing the latter from the forced setting to one state.

When a pulse of D-trigger 3 arrives at the C-input of synchronization from network synchronization block 4, the information coming to its Tsu input, i.e., will be rewritten to D-trigger 3. logical zero, which, on the installation input counters b, frees the latter from the forced installation in the state specified by code N, received K1NT1M to the information terminals of the counter 6. In addition, the logical zero coming from the direct output of the D-trigger 3 strobiruk The generator input 7 will prevent the generation of pulses arriving at the output terminal 8 of the driver.

In this case, the logical unit from the inverse exit trigger 3, arriving at the gate input of the generator 5, will allow the latter to go. pulse non-excitation, which, arriving at the subtracting input of counter b, will be counted by them.

When the counter reaches 6, the zero pulse at its output is a single pulse, which, arriving at the C-sync input of the N-flip-flop 2, will reset the last one at the trailing edge to the zero initial state, i.e. the logical unit from the inverse output of the D-flip-flop 2, arriving at the S-input of the D-flip-flop 3j, will set the latter to the initial single state ..

Thus, at the output of the driver 8, there are no trigger triacs from the moment of the first, after the arrival of the control panel to the input Kh & AMy 1, the zero crossing of the network voltage, until the counter is zeroed b.

The use of a pre-set device will ensure an increase in the accuracy of the formation of a pause, in order to ensure the reliability of the triac start and a reliable return to the initial state, regardless of the duration of the return pulse.

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Claims (1)

SYMISTOR START-UP PULSE FORMER, comprising a network synchronization block, the output of which is connected to the synchronizing input of the first D-trigger, the installation input of which is connected to the inverse output of the second B-trigger, the installation input of which is connected to the input terminal, a gated generator, the output of which is connected to the subtracting the counter input, the installation input of which is connected to the direct output of the first P-flip-flop, and the information input - with information terminals, the output terminal, D-inputs of the © triggers are connected to the source a zero level employee, which means that, in order to increase the accuracy and reliability of the device; it is equipped with an additional gated generator, the output of the additional gated generator connected to the output terminal, and the gating input connected to the direct output of the first trigger, whose inverse output is connected to the gating input g of the main gated generator, the counter output is connected to the synchronizing input of the second © -trigger.