SU1499332A1 - Annunciator of preset frequency value - Google Patents

Abstract

The invention relates to a measurement technique, in particular, to signaling devices for reaching a predetermined frequency value, and can be used in control and monitoring systems as a two-stage signaling device. The aim of the invention is to simplify the device. The device contains a shaper 1 of the input frequency pulses, a counter 2, a storage unit 3 of a given frequency, a generator of 4 pulses of the reference time interval, triggers 5,6, an actuation device 7. The counter counts the number of incoming pulses, and the result of reaching the specified frequency value is fixed on the triggers and transmitted to the actuator. 3 il.

Description

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with

Phi.

The invention relates to a measurement technique, in particular, to signaling devices for reaching a predetermined frequency value, and can be used in control and monitoring systems as a two-position signaling device.

The aim of the invention is to simplify the detector.

Figo 1 is a block diagram of a setpoint signaling device; figure 2 - timing charts; FIG. 3 is an electrical diagram of a counter

The signaling device contains the shaper 1 of the input frequency pulses, the counter 2, the storing frequency setpoint 3, the generator of 4 pulses of the reference time interval, triggers 5 and 6, the actuator 7, the shaper 8 pulses

The time diagrams (Fig; 2) show the diagrams of the following signals: a - pulses at the output of imaging device 1; b - pulses at the output of the pulse generator of the reference time interval; в - pulses at the output of counter 2; g - pulses at the output of the trigger 5; d - pulses at the output of the trigger 6.

The detector works as follows.

In the initial (zero) state of the counter 2, the triggers 5 and 6 are set-up by a pulse from the output of the pulse shaper 8, which is formed on the trailing edge of the first input pulse after turning on the power.

Each pulse from the output of generator 4 (Fig. 2, plot B) writes into counter 2 a parallel code for the number K, which is stored in block 3. The number K is determined from the known module of the counter N, the set value of the frequency f, and an exemplary interval

K N -; uh

t,. J-.

The impulses of the imager 1 with the frequency f (Fig. 2, plot a) are fed to the summing input counter J 2. If f. f 5, counter 2 in T does not have time to overflow, triggers 5 and 6 remain in O, which the executive device 7 performs as the absence of reaching the specified frequency value. If f f, counter 2 will count the number of pulses M greater than the given one in Td and will overflow before the next impulse comes from generator 4 (Fig 2, plot c). The overflow pulse switches to 1 trigger 5,

0 (figs, 2, plot g). Upon receipt of the next pulse. From generator 4, D-flip-flop 6 switches to 1 along its leading edge (Fig. 2, plot d). On the falling edge of this pulse, the 1-K-trigger 5 switches to 0. Thus, the trigger 6 remains at 1 until the next pulse arrives from the generator 4.

If several cycles are additional (1)

0 satisfies the condition f f. ,, trigger

3

in each of them switches to

111II

and back to O, and the trigger 6 will remain at 1 for the time IT, which works the actuator 7 as the achievement of a predetermined frequency value.

Claims (1)

Formula iso rete n i five 0 five 0 Q Signaling device of a given frequency value, contained the VIM pulse generator of the input frequency, the set number storage unit, the counter, the pulse generator of the sample time interval, two triggers, the pulse shaper and the actuator, the input frequency pulse generator output connected to the counter of the counter, the generator output pulses of the reference time interval are connected to the inputs of the installation of the counter, the first and second triggers, characterized in that, for the purpose of simplification, the first and second triggers in I-K- and D-flip-flops, respectively, the meter installation inputs, I-K- and D-flip-flops are their sync inputs, the outputs of the storage unit of a given number are connected to the information inputs of the counter, the overflow output of which is connected to the S-input I - K-flip-flop, the direct output of which is connected to the D-input of the D-flip-flop, the direct output of which is connected to the input of the actuating device, the output of the input frequency shaper is connected through the pulse shaper to the R-inputs of the counter, I - K and D- triggers. five and Thats P m A Fia t 27J