SU399057A1 - DEVICE FOR DETECTION LOSSES PULSE - Google Patents

Description

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The proposed device is 1sd11asiach1 for tele-automatic control systems.

A device for detecting the loss of a pulse is known, which contains quasi-selectors, a trigger with counting and installation inputs: Mie, two-input AND and OR, and NO.

However, such devices cannot detect the loss of a pulse and perform the functions of controlling pulses with a high duty cycle, where the pulse time is determined by tens of microseconds and the pauses by hundreds of milliseconds or even seconds, since the timing of the master node is not provided.

In order to improve noise immunity and reliability in the proposed device, the trigger outputs are connected to the inputs of quasi-selectors, the outputs of which are connected to the inputs of the And circuits, the second inputs of the And diagrams are connected to the output of the NOT circuit, the input of which is connected to the trigger counting input, and the outputs of the And circuits are connected with the inputs of the OR circuit and with the installation inputs of the trigger.

The drawing shows a block diagram of the proposed device.

The device contains a trigger 1, quasi-selectors 2 and 3, the circuit “And 4 and 5, the circuit“ NOT 6 and the circuit “OR 7.

The operation of the device is as follows.

Controlled pulses are sent to the counting trigger input, as a result of which the trigger / periodically takes the state "1 or" O. Quasi-selector 2 or 3, at the input of which there is a signal “1. measures the time spent by trigger 1 in this state (period of monitored pulses), and quasi-selector 2 or 3, at the input of which the signal "O" is being prepared for the next measurement. The signal "I on quasi-selector 2 or 3 appears only when the period of the monitored impulses becomes longer than the installation time of the quasisel1; torus, and therefore, during normal passage of the monitored pulses, there is no alarm at the output of the device.

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If the controlled pulses disappear for a time longer than the installation time of a quasi selector 2 or 3, then at the output of one of

i quasi-selectors appear signal "1. Since all the inputs of the “AND 4 (5) circuit connected to this k-vaziselektor, there are signals corresponding to“ 1, then the output of the circuit “AND 4 (5), and, consequently, on

0 output of the device (scheme "OR 7)

There is an alarm signal. From the output of the circuit “AND 4 (5), the signal“ 1 is fed to the installation input of the corresponding trigger arm / and keeps it in an emergency condition, which ensures a clear fixation of the fact of loss of impulse and high noise immunity in the input and power supply. The connection of the input of the device through the circuit "NOT 6 with the input of the circuit" AND 4 (5) ensures the automatic return of the device to the servo state when it resumes the tracking of pulses and noise immunity during transients.

Item invented by ai

A device for detecting loss of impulses, containing quasi-selectors, a trigger with counting and installation inputs, two-input AND and OR schemes and a NOT, NOT, in order to increase noise immunity and reliability, in it the trigger outputs are connected to the inputs to the Vasselectors, the outputs of which are connected to the input of the “And” circuits, the second inputs of the “And” circuits are connected to the output of the “NOT” circuit, the input of which is connected to the counting input of the trigger, the outputs of the “And” circuits are connected to the inputs of the “OR” circuit and the installation inputs of the trigger.

output