SU928295A1 - Device for expanding time intervals - Google Patents

Description

(5) DEVICE FOR EXTENDING TEMPORARY INTERVALS

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The invention relates to a pulse and measuring technique and may; be used, in particular, in automatic control systems.

A device for expanding time intervals is known, comprising delay elements, OR elements, keys, a cumulative element, a discriminator, triggers, elements and a decoder, a reversible counter, and drivers 11.

However, the known device is difficult and has insufficient reliability.

The closest to the invention to the technical essence is a device containing a key management unit, which includes a trigger, two keys, OR, AND, NOT elements, a pulse shaper, and the inputs of the keys and the trigger are combined and are the device input, the output element OR connected directly to the input.

Claims (2)

element And through the pulse shaper with the input element NOT, the second input of which is connected to the output of the First key, and the output serves as the output of the device, the first trigger output is connected to the second input of the first key and the second input of the And element, and the second input of the second key is combined with the output of the element And, the reversible counter of which is connected to the output of the second key of the key management unit, and the bits of the counter connected to the inputs of the OR element of the key management unit, the frequency divider, the underdriver element, three keys, the generator A pulse pulse whose output is a frequency divider and a key, the second input of which is connected to the output of the element I, is connected to the subtracting input of the reversible counter, to the sum of the input of which the output of the second key is connected, to the control input of which the second 3 is connected. the trigger output of the key control unit, in addition, there is an additional key and a trigger, the additional key input is combined with the third key input and the frequency divider input, and the output is connected to the second key input, the first trigger input is connected to the frequency divider output, and the second through the delay element - with the output of the third key, the first trigger output is connected to the control input of the additional key, and the second output - to the second input of the third key 23. The disadvantages of this device are the relative complexity and the fact that the duty cycle of the pulse generator should be more than two and depends on the parameters of the element of the delay. The aim of the invention is to increase the reliability of the device. The goal is achieved by the fact that in a device for extending time intervals containing a pulse generator, a frequency divider has a counting trigger, the input of which is connected to the primary input of the first AND element, the output of which is connected to the first input of the first OR element, the second input of which is connected through the pulse shaper the first input of the second element AND to the output of the second element OR, the inputs of which are connected to the discharge outputs of the reversible counter, the first input of which is connected to the output of the third element AND, n The first input of which is connected to the first output of the counting trigger, the second output of which is connected to the second input of the second element I, the output of which is connected to the first input of the fourth element And, additionally connected in series (Element N.Е and element And whose output is connected to the input counting trigger, and the input element is NOT connected to the first input of the Fourth element And, the output of which is connected via a frequency divider to the second input of the reversible counter, and the second input of the fourth element And is connected to the output th momenta of the generator and a second input of the third AND el ment, the first input of which is connected to the second input of the first element 5 IV The drawing is a diagram of the device funktsioalna. The device for expanding the time intervals contains a generator of 1 emulses, a reversible counter 2, an actuator of 3 pulses, a divider 4 frequencies, a counting trigger 5, elements AND 6-10, element NOT 11, elements OR 12 and 13, input bus 1 and output bus 15. The device for expanding time intervals operates as follows. In the initial position, the counting trigger 5 and the reversible counter 2 are in the zero state (logical zeroes are present on the first output of the counting trigger. 5 and on all outputs of the reverse counter 2). Bringing the device back to its original position is necessary once the device is turned on, since after the extension of the expansion of each time interval is over, the device itself is set to this state. The signal from the output of the pulse generator 1 does not pass to the first input of the reversible counter 2, since the first input of the And 7 element has a prohibition (logical zero). The signal from the output of the pulse generator 1 does not pass to the input of the frequency divider k, since the first input of the And 8 element has a prohibition that comes from the output of the And 9 element. The logical one from the second output of the counting trigger .5 and the logical zero from the output of the element OR 12. The logical zero that is present at the output of the element AND 9 is fed to the input of the additional element AND 10 through the element NOT 11 as a logical unit, thereby giving permission to receive input pulse signals. Let now a short pulse arrives on the input bus 14 of the device, fixing the beginning of the time interval tg to be converted. This pulse enters through the element 10 and the input of the counting trigger 5 and the first input of the element 6. On the leading edge of the first input pulse, the counting trigger 5 is activated, at the first output of which a logical unit is set that permits the passage of the input pulse through the element b and element OR 13 to the output bus 15 of the device, thereby fixing the origin of the converted output signal. From this moment on the summing input of the reversible counter 2 through the element And 7 begin to receive pulses of frequency f from the generator 1 pulses. Writing the first pulse to reversible 1 1 counter 2 causes the logical unit to appear at the output of the OR 12 element. The output of the logical element AND 9 continues to remain a logical zero, since the logical zero of the output of the counting trigger 5 now arrives at its input. The signal from the output of the pulse generator 1 still does not reach the input frequency divider, since the output of the AND element 9 at the input of the element And 8 receives a logical zero. Over time, the number of pulses N foi gy is recorded in the reverse counter 2 on the leading edge of the second pulse arriving at the device input bus H and indicating the end of the interval (fgy, counting trigger 5 is reset. Logical zero at the output of counting three | - Gera 5 prohibits the passage of the second input pulse to the output bus 15 of the device and stops the arrival of the signal from the pulse generator 1 to the summing input of the reversible counter 2. The appearance of a logical unit on the second output the counting trigger 5 leads to the establishment of a logical unit at the output of the element And 9 and at the input of the logical element And 8, as well as a logical zero at the first input of the element And 6, prohibiting, before the conversion, reception of signals on the input bus. This begins to receive a pulse from the output of the frequency divider with a repetition frequency f - - - -. - .- ... These pulses continue to flow until the reversible counter 2 returns to its original zero state. Then, a logical zero appears at the output of the OR 12 element, so that a logical zero is established at the output of the And 9 element, prohibiting the signal from the output of the generator 1 pulses to the input of the frequency divider. A logical unit appears at the first input of AND 6, allowing reception of the signal along the input line It. At the moment when the signal at the output of the element OR 12 transforms from a logical unit to a logical zero, the pulse generator 3 generates a short pulse passing through the OR element 13 to the output bus 15 of the device, fixing the end of the formation of the extended time interval. Thus, the number of pulses (xiTaK as AND, K, GBx; k, k +1) is subtracted from the amount recorded in the reversible counter 2 in the summation process. Thus, the proposed device is simpler and more reliable than the known devices and there is no limitation on the duty cycle pulses and it does not depend on the parameters of the elements of the device. Formula of the invention A device for extending time intervals, comprising a pulse generator, a frequency divider, a counting trigger whose input is connected to the first input of the first And element, the output of which inn with the first input of the first element OR, the second input of which through the pulse shaper is connected to the first input of the second element AND and to the output of the second element OR, whose inputs are connected to the discharge outputs of the reversing counter, the first input which is connected to the output of the third element AND, the first the input of which is connected to the first output of the counting trigger, the second output of the counting trigger is connected to the second input of the second element And, the output of which is connected to the first input of the fourth element And, characterized in that To increase reliability, it is additionally entered in series with the NOT element and the AND element, the output of which is connected to the input of the counting trigger, and the input of the element is NOT connected to the first input of the fourth And element, the output of which is connected through the frequency divider to the second input of the reversible counter, and the second the input of the fourth element I is connected to the output of the pulse generator and to the second input of the third element I, the first input of which is connected to the second input of the first element I. 9 28295 Sources of information are received e into account during the examination 1. USSR Copyright Certificate No. 50877, cl. G About F 10/0, 1973. 5 2. USSR author's certificate number 532079g. C O F 10/0, 1975.