SU413458A1 - - Google Patents

Description

The invention relates to the field of automation, namely to systems of extreme regulation.

Limestone input devices for extreme regulators containing three keys. The first inputs of the first and second keys are connected to the output of the signal source, the second input of the first key is connected to the first output of the control unit, the second output of which is connected to the output of the first key and to the first input of the third key via the search step and memory block. The output of the third key and the output of the second through a series-connected source follower and amplifier are connected to the first input of the I circuit, the second input of this circuit to the output of the delay circuit, and the output to the first trigger input, the second input of which is connected to the third output of the control unit.

The purpose of the invention is to improve the accuracy of the device.

This is achieved by introducing a pulse shaper and a controlled hepater into the device, the input of which is connected to the output of the signal source, the first output to the second input of the second key, and the second output to the inputs of the delay circuit and the driver of the pulses whose output is connected to the second input third key.

The drawing shows a block diagram of the input device for the extreme controller.

It contains a key 1, a storage capacitor (memory unit) 2, a unit 3 for specifying the search step, a control unit 4, keys 5 and 6, a controlled oscillator 7, a pulse shaper 8, a delay circuit 9, a source follower 10, an amplifier 11, a circuit "And 12,

trigger 13, signal source 14.

The input device works in the following way.

At the first moment, the key 1 from the control unit 4 closes. Key 1 sets

at the output of block 3, the search step is set to zero voltage. On capacitor 2, the signal f / 3aiT, which is equal to the input voltage at a given time, is memorized. Next, the control unit opens the key 1, delivers

the pulse of the beginning of the formation of the next time interval on the trigger 13 and sets at the output of the block 3 the voltage AL const. This voltage is added with the voltage of the signal if the input voltage monotonically increases, and is subtracted if the input voltage monotonously decreases. The source follower 10 is alternately connected by switches 5 and 6 to the voltage (t / aan + AL) or to the current input signal t / TCK - Time 1 H1 interval is formed,

when I / tech 1 t / aan + FOR a monotonously increasing input signal or when | tech | | zap-af / | For a monotonously decreasing signal. In the future we will consider the operation of the device for the first case.

At the end of the formation of the time interval at the output of the amplifier 11, an impulse appears that opens the AND 12 circuit at the first input. Pulse output circuit

9delays through the open circuit And 12 returns trigger 13 to a bullet state. The duration of the allocated time interval M at the output of the trigger is determined by the following expression:

l / D And -; ,

tech.sr

where (Leaked. compare. - average rate of change of the input spgnal in a given time interval D.

The frequency of the pulses / oscillator 7 controlling the keys 5 and 6 is determined by the current input signal

/ - / С-Н „к,

where X is the transfer coefficient of the controlled oscillator. With the arrival of each pulse from the controlled generator, the driver 8 emits a pulse of a stable DPST. The gate of the field-effect transistor at this time is connected to the storage capacitor 2, which achieves a compensation for the discharge of the capacitor due to the gate current-induced current leakage. To reduce the effects of source current source emissions

10, at the moment when the keys 5 and 6 are switched, the And circuit 12 is polled after some time specified by the delay circuit 9. The impulse to the delay circuit arrives at the moment of locking the key 5.

The voltage across the memory capacitor remains almost unchanged over the allotted time period M, if the following condition is fulfilled:

Vpasp - V:

air

OR

and

i di t, T „

R

discharge of a storage capacitor by leakage currents;

the charge of the storage capacitor by the gate current of the field trampistor; the number of pulses at the output of the generator 7 in time A /;

is - thermostatically controlled shutter current

field effect transistor; R is a parallel connection of the insulation resistances of a capacitor 2, keys 1 and 5, and installation wires. During the operation of the compensating circuit, it is possible to Pripy / t that / 7zap coost FOR a dy time interval,

t, t,

R

or

zap

M

R

Taking into account that Lek is zap, due to the smallness of the Aty-ci.VTeK value. will get

./,.г ,.

The last expression makes it possible to choose the parameters / C, Go in order to increase the accuracy of the selection of time intervals at low rates of change.

5 input signal.

Thus, the minimum time And /, was revealed. It is possible to determine the maximum rate of change of any technological parameter in the production process.

Subject invention

An input device for an extremal regulator containing three keys, the first inputs of the first and second keys are connected to the output of the signal source, the second input of the first key is connected to the first output of the control unit, the second output of which is through the block

0 assignment of the search step and the memory unit are connected to the output of the first key and to the first input of the third key, the output of which and the output of the second key are connected via a source-follower and pulse

5, the amplifier is connected to the first input of the I circuit, the second input of which is connected to the output of the delay circuit, and the output to the first input of the trigger, the second input of which is connected to the third output of the control unit,

0 characterized in that, in order to improve the accuracy of the device, it contains a pulse shaper and a controlled oscillator, the input of which is connected to the output of the signal source, the first output - with

5 with the second input of the second key, and the second output with the inputs of the delay circuit and the pulse shaper, the output of which is connected to the second input of the third key.