SU1474582A1 - Device for extending time intervals - Google Patents

Abstract

The invention can be used in automatic control systems. The purpose of the invention is to increase the reliability and accuracy of time interval expansion by forming output pulses of equal duration to the generator pulses. The proposed device contains a generator of 1 pulses, a divider 2 frequencies, a reversible counter 3, triggers 4,5,6, elements AND 7,8,9, elements NOT 10, element OR-NOT 11 and element 2 AND -OR - NOT 12. 2 or .

Description

not 14 and to the second input element And 9, the first input of which is connected to the inverse output of the trigger 5, and the output to the C input of the trigger 6.

The device works as follows.

In the initial state, trigger 4 is in the zero state, trigger 6 is in the unit state, and reversible counter 3 is in the zero state. The low potential of the direct output of trigger 4 is fed to the D input of trigger 5 and the last

generator 1 and fixing the beginning of the time interval. The pulse from the output of element 2I-OR-NO 12 does not pass to the output of element 9, since the latter is closed by the low potential of the inverse output of trigger 5. Therefore, trigger 6 does not change its state and continues to keep frequency divider 2 in the zero state. The reversible counter 3 sets the pulses coming from the output of the element AND 8 to the input of the addition.

When the second input pulse arrives from the input bus 13 through the element AND 7 to the C input of the trigger 4, the latter returns to the initial (zero) state. As can be seen from the diagram, the input interval (time from the leading edge of the first pulse to the leading edge of the second pulse), at which the reversing

the counter counts N addition pulses, is

 And meChKS

(N + D-T; (N-l) -T,

AND / THEM

, e. in general

N-T,

L and in

where T is the period of the pulse generator 1.

On the leading edge of the next positive impulse from the output of the NOT 10 element arriving at the C input of the trigger 5, the latter also returns to the initial (zero) state and closes the AND 8 element and the II-OR-NO 12 with a low potential of the direct output. The high potential of the in- verse output of the trigger 5 is fed to the first input of the element AND 9, at the second input of which there is a high potential from the output of the element 2I-OR-NOT 12, therefore, a high potential is formed at its output, which translates the trigger 6 to zero state. At the same time, the low potential of the direct output of the trigger 6 blocks the element I 7, and the high potential of its inverse output opens the element 2I-OR-HE 12 and enables the divider 2 frequencies to work.

Thus, by the first input pulse, the reversible counter 3 counts N addition pulses corresponding to the input interval, i.e. counts time t, equal to t1 (N-l) T + -C,

where - the duration of the pulse generator I.

Then the reversible counter 3 switches to the subtraction of the pulses coming from the output of the splitter 2 frequency. After the 3-N counter of the reversing counter has arrived at the input, the pulses from the output of the splitter 2 frequency in the reversing counter 3 are written O, i.e. a low potential is set at all outputs of the reversing counter 3, and

five

that OR-NOT I is high, which opens element 2I-OR-NO 12 through the second input, at the first input of which at this moment there is a low potential from the output of generator 1. Another impulse of generator 1 passes to the output of element 2I-OR- NOT 12, fixing the end of the output time interval. A negative impulse from the output of element 2I-OR-NO 12 through element 9 is fed to the C input of trigger 6, which, at the end of this impulse, returns to the initial (single) state. The counting time in the subtraction mode until the second output pulse t is equal to

t g K-N

T + T

-

where K is the division ratio of the divider 2 frequency.

Consequently, the output time interval will be

and you

Knt

+ t7: NT-T + -J +

+ t - t (K + ONT.

0 25 0 5 0

five

0

five

Thus, the device generates two output pulses, which record the beginning and end of the output time interval, extended compared to the input one (K + 1) times.

Claims (1)

Invention Formula A device for expanding time intervals, containing the first And element, the first input of which is connected to the input bus, and the output connected to the C input of the first trigger, the D input of which is connected to its inverse output, the second And element, the first input of which is connected to the generator output pulses, and the output is connected to the input of the reversible counter, the input of which is connected to the output of the frequency divider, the third element, the first input of which is connected to the inverse output of the second trigger, the input of which is connected to the output m element is NOT, and the third trigger, the direct output of which is connected to the second input of the first element AND, differs in that, in order to increase reliability and accuracy, the element OR-NOT and element 2I-OR-NOT are added to it, the output of which is connected to the output bus and the second input the house of the third element And, the first entrance 7-14745828. Element 2I-OR-NO bridges are connected and connected to the second input of the second electrically connected to the output of the pulse generator I and to the forward output of the second owl, to the input of the element NOT and to the input of the de-trigger, the D input of which is connected to the frequency generator, the second inputs of the primary output of the first trigger, and that of the 2-OR-NOT are combined and connected the fourth input of the element 2-OR-NOT is connected to the output of the OR-NOT element, the inputs of which keys to the reset input of the time divider are connected to the corresponding times, to the D-input and inverse output by the regular outputs of the reversible counter- the second trigger, the C input of which is juice, the third input of element 2 Igli-Non 10 is connected with the output of the third element I.