SU864514A1 - Plse train generator - Google Patents

Description

The invention relates to a pulse technique and is intended to control the operation of switches of telephone exchanges. ·

A device for generating a series of pulses, containing a pulse generator, key, counter, trigger, multi-input circuit And and a programming unit. The principle of operation of the device is to measure the conversion factor of the counter using the programming side. This changes the duty cycle of the pulse sequence at the output of the trigger, those. and the number of pulses at the output of the key controlled by the trigger [1].

The disadvantage of this device is the inconstancy of the period following the series and the inability to change the duration and pause between pulses in the series.

The closest in technical essence to this invention is a device for generating a series of pulses containing a pulse generator, counters, trigger, circuit 'AND, element NO and programming unit. One of the counters of this device operates on periodic overflow, which ensures the constancy of the period following series 12].

However, this device does not allow changing the duration and pauses between pulses in a series.

The aim of the invention is to expand the functional capabilities of the device by obtaining program-controlled durations and pauses between pulses in a series.

This goal is achieved by the fact that in the pulse series generator containing a stable frequency generator connected to the input of the first element And, and two counters ^ the output of the first of which is connected to a single input of the first trigger, the output of which is connected to the second input of the first element And, and the output of the first programming unit is connected to the installation inputs of the second counter, the second AND element, the third and fourth counter, the second and third programming blocks, the second and third triggers and the frequency divider are introduced, and the output is gene a stable frequency converter is connected to the first input of the second element And, and through a frequency divider, to the unit inputs of the second and first triggers, the output of the first trigger is connected to the input of the third counter, the output of which is connected through the third programming unit with its installation inputs and through the fourth counter - from ₅ vym zero input of the third flip-flop, but directly with the zero input of the second flip-flop, whose output is connected to a second input of the second aND gate, to the third inputs of the first and second aND gates connected to the output t of a trigger, the output of the second element And is connected to the counting input of the first counter, the output of which is connected to the input of the second programming unit, the output of the first element And is connected to the counting input of the second counter, the output of which is connected to the zero input of the first trigger and the input the first programming unit, and the start bus is connected to the unit inputs of the first, second and third triggers and to the zeroing input of the frequency divider.

In FIG. 1 shows a structural diagram of a device; in FIG. 2 - time diagrams of his work.

The device comprises a stable frequency generator 1 connected through the second and first ₂₅ elements AND 2, 3 to the counting inputs of the first and second counters 4, 5, the outputs of which, respectively, through the second and first programming blocks 6, 7 are connected to their installation inputs, and directly to the inputs of the first trigger 8. The direct output of the trigger 8 is connected to the second input of the element FROM \ and the counting input of the third counter 9 of the number of pulses in the series, the output of which is connected through the third programming unit 10 with its installation inputs, through even the fifth counter ³⁵ 11 is with the input of the third trigger 12, and directly with the input of the second trigger 13, the direct output of which is connected to the second input of the I element 2. A trigger bus is connected to the second input of the trigger 12, and ⁴⁰ its direct output is connected to the third inputs of the elements And 2, 3. To the second input of the trigger 13 is connected the output of the frequency divider 14, the input of which is connected with the output of the generator 1.

The operation of the device is as follows. 45 In the initial state trigegry 8, 12, 13 are "at zero" in the counters 4, 5, 9 are written, respectively, of A _{1 (B 2,} Cj. When a signal for starting the bus triggers 8, 12, 13 are installed in the individual, and the divider is 14 hours – 50 tons into the zero state. The pulses of generator 1 are supplied through open elements AND 2,. 3, respectively, to counters 4, 5. Through (2 —B |) pulses of generator 1 (n is the number of bits of counters 4, 5 ) counter 5 overflows and the overflow pulse $$ sets trigger 8 to zero, while the overflow pulse through programs unit 7 '

code В _{2 is} entered into counter 5, and the element And 3 is closed by the potential of trigger 8. Through (2 ^nd - A1) pulses of generator 1 (A is always greater than B) counter 4 is overflowed and trigger 8 is again set to a single state. At the same time, through programming unit 6, code A2 is entered into counter 4. The process of generating pulses at the output of trigger 8 stops when the counter 9 overflows, which occurs after 2 ^m C'i pulses (hl is the number of bits of the counter 9) at the output of the trigger 8. The overflow pulse of the counter 9 records the number C2 from the programming unit 10 to the counter 9 . The same pulse sets the trigger 13 to the zero state. The potentials of triggers 8, 12 and elements will be closed. Through the k-pulses of the generator 1 (from the moment the signal was sent via the start bus), a pulse appears at the output of the frequency divider 14, which sets the triggers 8, 13 to a single state. This allows the generation of the next series of pulses.

The series generation process is terminated through p series (p is the conversion factor of the counter 11). The pulse counter overflow trigger 12 is reset. The next cycle starts when the signal is applied via the start bus.

The proposed device allows you to programmatically control the duration of the pulses in the series (change in the coefficients B), the duration of the pauses (change in the coefficients A), the number of pulses in the series (change in the coefficients C). In this case, the repetition period of the series is determined by the coefficient K of the frequency divider 14, and the number of series in the cycle is determined by the coefficient p of the counter 11. Changing the pulse duration in the series and the pause between them is necessary when controlling the telephone exchange switches. In this case, the operator programs the required subscriber number (or part of it) by setting the coefficients C. The check is carried out at three values of pulse durations in series with the duty cycle factor (normal, less than normal, more than normal), which is associated with various types of subscriber units (different pulse frequency in a series at a constant duty cycle of the pulse sequence).

Thus, the proposed device allows to mechanize the work of the operator to check faults in the switches.

Claims (2)

1. USSR author's certificate number 456357, cl. H 03 K 3/78, 1972. 2. Authors certificate of the USSR N 632063, cl. H 03 K 3/64, 1977. П Г I