SU792159A1

SU792159A1 - Apparatus for determining function extremums

Info

Publication number: SU792159A1
Application number: SU792740136A
Authority: SU
Inventors: Александр Ильич Попов
Original assignee: Проектный Институт "Уралпроектмонтажавтоматика"
Priority date: 1979-03-21
Filing date: 1979-03-21
Publication date: 1980-12-30

Description

II

Изобретение относитс к измерительной технике и может быть исполь-, эовано в устройствах дл выделени или стробировани электрических сигналов разных уровней.The invention relates to a measurement technique and can be used in devices for extracting or gating electrical signals of different levels.

Известно устройство дл определени экстремальных значений сигнала, содержащее дифференциальные усилители , зар дные диоды, ждущие мультивибраторы , запоминакицие конденсаторы разр дные и зар дные ключи.A device for determining the extreme values of a signal is known, which contains differential amplifiers, charging diodes, waiting multivibrators, memorizing discharge capacitors and charging switches.

Недостаткйм устройства вл етс сложность его регшизации, а также ограниченный амплитудный и частотный диапазоны исследуемого сигнала.The drawback of the device is the complexity of its reshuffling, as well as the limited amplitude and frequency ranges of the signal under study.

Наиболее близким техническим решением к изобретению вл етс устройство дл определени экстремумов функции, содержащее входной ключ, синхронизатор, запоминающую чейку, стробируемые ключи, регистратор, импульсную схему сравнени , триггер и усилитель-ограничитель, в котором импульсна схема сравнени соединена со входом устройства через входной ключ, :запоминающую- чейку, второй стробируемый ключ и через первый стробируемый ключ, а выход импульсной схемысравнени через усилитель ограничитель, триггер соединен сThe closest technical solution to the invention is a device for determining extremes of a function, comprising an input key, a synchronizer, a storage cell, gated keys, a recorder, a pulse comparison circuit, a trigger and a limiter amplifier, in which the comparison pulse circuit is connected to the device input via an input key ,: the storage cell, the second gated key and the first gated key, and the output of the pulsed comparison circuit through the amplifier is a limiter, the trigger is connected to

регистратором, который присоединен к выходу запоминающей чейки.a recorder that is connected to the output of the memory cell.

Недостатком устройства вл етс сложность его реализации, а также низка точность измерени , определ ема суммарной нестабильностью импульсной схемы сравнени в момент изменени пол рности напр жени и нестабильностью усилител -ограничиto тел .The drawback of the device is the complexity of its implementation, as well as low measurement accuracy, which is determined by the total instability of the pulse comparison circuit at the time of polarity variation and the instability of the limiting amplifier body.

Цель изобретени - повышение точности и упрощение устройства.The purpose of the invention is to improve the accuracy and simplify the device.

Поставленна цель достигаетс тем, что в устройство дл определени The goal is achieved by the fact that in the device for determining

Claims

15 extremums of the function, containing a synchronizer, a storage capacitor, electronic keys and a comparator, a second storage capacitor and a source of voltage supplies were additionally introduced. A push-pull generator was used as a synchronizer, the storage capacitors connected to the inputs of a comparator 25, a regenerative cell , the first key is connected between the input of the device and the first input of the comparator, the second key is connected between the first input of the comparator and the source of the reference voltage and, connected to the second input of the comparator, the control inputs of both switches are connected to the generator's different polar outputs, and the storage capacitor of higher capacitance is connected to the first input of the comparator. Fig, 1 shows the block diagram of the device; Fig. 2 shows timing charts explaining the operation of the device for determining the extremes of a function. The device for determining the extremums of the function contains a comparator 1 with inputs 2 and 3 and output 4, memory capacitors 5 and 6, electronic key 7, input terminal electronic key 9, synchronizer 1 and source 11 Reference voltage. As a synchronizer 10, a push-pull generator is used, the parallel outputs of which are connected to the control inputs of the electric switches 7 and 9, Comparator 1 is a diode-regenerative cell with a diode comparison circuit and a blocking generator. The capacitance of the capacitor 5 is significantly greater than the capacity of the capacitor b. The device works as follows. The condition for generating comparator 1 is satisfied if the voltage at its input 3 is greater than the input voltage by the threshold of the comparator 1. During the time of the first switch cycle of the electronic keys, when the key 9 is open, the capacitor 5 is charged, in the second cycle the switch Key 7 is opened and capacitor 6 is charged from capacitor 5 through voltage source 11. When the input voltage rises at terminal 8 (time instant tu - fig. 2), capacitor 5 charges up to a high voltage value in the first switching cycle yucheni. Since, in this case, the voltage on the input 2 of the comparator is greater than the voltage on its input 3, the oscillation generation of the comparator does not occur. In the case of the passage of the maximum of the voltage under investigation at the next opening of the key 9 in the first switching cycle, the voltage on the capacitor 5 decreases, since it discharges through the switch 9 and the source of the input voltage. In this case, the voltage on the capacitor b is greater than the voltage on the capacitor 5, since the constant time of the discharge circuit of the capacitor 6 is much longer than the constant time of the charge circuit of the capacitor 5. Due to the presence of positive feedback, the comparator 1 is activated in the time section fcj-i (Fig. 2), the drop-down curve of the voltage under study to the minimum point of the function (i-Fig. 2). In the temporary section -fc t5 (Fig. 2), the voltage on the capacitor 6 is less than the voltage on the capacitor 5 and the generation condition of the comparator 1 is not met due to the presence of negative feedback on it. The source of the reference voltage 8 is used to adjust the operation threshold of the comparator and to compensate for the drop in voltage across the comparator diodes and keys 7, 9. Simplifying the device for determining the extremes of the function in comparison with the known, as well as extending the amplitude and frequency ranges of the input signal by applying Neither a diode-regenerative comparator with positive and negative feedbacks on the input voltage allows it to be used in digital measuring converters. Apparatus of the Invention A device for determining extrema of a function, comprising a synchronous & torus, memory capacitor, electronic keys and a comparator, which are different in that, in order to improve accuracy and simplify it, a second memory capacitor and voltage source are additionally introduced into it synchronizer used push-pull generator, storage capacitors connected to the inputs of the comparator, made, for example, in the form of a diode-regenerative cell, the first key is connected between the input device Twa and the first input of the comparator, the second switch is connected between the first input of the comparator and a reference voltage coupled to the second input of the comparator, the control inputs of both keys are attached to opposite-sex molecular outputs reHepaTjopa, wherein the first input of the comparator is connected to a storage capacitor larger in nominal capacity.