SU756407A1 - Converter of analogue signal variation rate into time interval - Google Patents

Description

The invention relates to instrumentation and can be used in automatic control systems.

A known speed converter * changes the analog signal into a time interval containing a comparator, the output of which is connected via a key to a storage element, the storage element is connected to the first input of the comparator via the output 'θ device, and the second input receives a convertible signal ”the comparator generates a pulse proportional to the difference of 15 signals at its input

The disadvantage of this device is low speed.

A known converter of measuring speed of an analog signal in a time interval, containing a comparison unit, the output of which is connected to the device input by selecting a difference in time intervals [2].

The disadvantage of this device is 25 low speed.

The purpose of the invention is to increase speed.

This goal is achieved by the fact that the speed converter is changed ^. thirty

2

the analog signal in the time interval containing the comparison unit, introduced element 2I-2ILI, pulse shaper control trigger, trigger sign derivative, three elements And two switches bipolar voltage integrator, and the inputs of elements 2I-2IL or connected to the outputs of the trigger sign derivative and unit of comparison, and the output is connected to the input of the pulse shaper, the first input of the control trigger to the first inputs of the elements And, the output of the first element And, the second input of which is connected to the zero output of the trigger, correct I, is connected to the control inputs of two switches of bipolar signals, the output of the second element I, the second input of which is connected to the unit output of the control trigger, is connected to the counting input of the derivative sign trigger, the outputs of which are connected to the blocking inputs of switches of bipolar signals whose outputs are connected through an integrator with the input of the block is comparable; I, the output of the driver and the Pulse are connected to the second inputs of the control trigger and the third element I.

756407

FIG. 1 shows the structural

wiring diagram of the device, * on

FIG. 2 - timing diagrams explaining the principle of operation of the device.

The device comprises a comparison unit 1, a shaper 2 pulses, an integrator 3, switches 4, 5 bipolar voltages, a control trigger 6, a trigger 7 characters of the derivative, an element 8 2I-OR elements 9, 10, 11 I.

The signal input of block 1 receives the signal y (s), and the other input receives the voltage of integrator 3. The conversion takes two clock cycles, the first determines the rate of change and increment of the signal under study, and the second clock is needed to restore the initial conversion conditions. The order of conversion depends on the sign of the derivative. Consider the work with increasing y (s). In this case, the trigger 7 is set to the zero state and through element 8 connects the "direct" output of block 1 to the driver 2 and other elements of the device. The shaper 2 when entering at its entrance the transition from "1" p "0" generates a pulse D. The duration of which is equal to the first cycle when y '(s) =

= 0

The beginning of the first clock cycle is characterized by the transition of block 7 from "1" to "O", which leads to the start of shaper 2 and setting trigger 6 to one state, connecting + and _about to the input of integrator 3. Since y '(ί)> 0 is the back edge of the pulse ds ₀ will appear before block 1 transition from "0" to "1". The falling edge of the ds _o pulse sets the trigger 6 to the zero state, preparing the passage of the signal from block 7 through element 10. The overvoltage of integrator 3 y (¢) to the threshold value means the end of the first cycle AND the appearance of ”1" at the output of element 10.

Switches 4.5 have two inputs - one control, the other blocking. When applying "0" to the blocking input, the switches 4.5, regardless of the state of the control input, are disconnected from the switched voltages. Since the trigger 7 is in the zero state, the switch 5 is blocked, the unit at the output of the element 10 means the connection and to the integrator input, which leads to change the direction and rate of change of the integrator voltage • 3.

By choosing] -i _in 05 \. + And _o 1, the condition г _{4 4} ds is reached. The achievement of the voltage of the integrator 3 values y (c) -b is fixed by the transition of block 1 from "1" to "0" and the beginning of the next conversion cycle.

The change in the sign of the derivative (γ '(ί) <0) leads to the fact that the achievement of the voltage of the integrator 3 values of y (ί) + a will occur before the arrival of the trailing edge of the pulse & ι _θ . In this case, the unit from the output of block 1 will go through element 11 and change the state of trigger 7 to OPPOSITION - bDUNCH *. ΤΟΗΓ'ΓΘΟ 4 3 3. · “

blocks the switch 4 and connects the "inverse" output of the block 7 to the driver 2. Since the output of the element 8 operates "0", then the output of the element 11 is also "0" and the switch 5 supplies the input of the integrator 3 -Ch equal to + 11o Achieving voltage integrator 10, the value y 3 (t) -b will result in the output signal of the unit element 11, which connects to the input of the integrator 3, the return voltage _and + A and + ₈ 0) -iv! the second cycle is completed when the condition is reached and $ = y (1) + a.

The time interval is formed at the output of the element 2, which performs the subtraction operation d1 _{L -} ds ₂ = d1x.

If y '(c) = 0, then the back edge of the pulse dc _o and the transition from "0" to "1" at the output of element 8 almost coincides, which means d1 ₄ = dg ₂ and there is no pulse at the output of element 9.

The converter of the rate of change of the signal in the time interval increases the speed and provides a practically linear dependence of the output frequency of the device on the magnitude of the derivative module.

Claims (1)

Claim The converter of the rate of change of the analog signal into a time interval containing a block comparison, characterized in that, in order to increase speed, element 2I-2ILI, a pulse driver, a control trigger, a derivative sign trigger, three AND elements, two bipolar voltage switches, an integrator The inputs of the element 2I-2ILI are connected to the outputs of the trigger of the derivative sign and the comparator, and its output is connected to the input of the pulse former, the first input of the control trigger, the first inputs of the elements AND, the output of the first element And, the second input of which is connected to the zero output of the control trigger, is connected to the control inputs of two switches of bipolar signals, the output of the second element And, the second input of which is connected to the single output of the control trigger, is connected to the counting input of the sign trigger of the derivative, the outputs of which connected to the unit with the current inputs of switches of bipolar signals whose outputs are so757540 via the integrator with the input of the comparison unit, the pulse driver output, connected to the second inputs of the control trigger and the third element I.