SU834877A1

SU834877A1 - Device for detecting pulse loss

Info

Publication number: SU834877A1
Application number: SU792805473A
Authority: SU
Inventors: Леонтий Николаевич Герасимов; Владимир Витальевич Скрябин
Original assignee: Предприятие П/Я А-3327
Priority date: 1979-08-06
Filing date: 1979-08-06
Publication date: 1981-05-30

Description

(54) УСТРОЙСТВО ДЛЯ ОБНАРУЖЕНИЯ ПОТЕРИ ИМПУЛЬСОВ(54) DEVICE FOR DETECTING LOSSES OF PULSES

II

Изобретение относитс к импульсной технике и может быть использовано дл контрол импульсных последовательностей.The invention relates to a pulse technique and can be used to control pulse sequences.

Известно устройство, содержащее два квазиселектора, триггер, двухвходовые элементы И, ИЛИ, инвертор, соответственно св занные между собой 1.A device is known comprising two quasi-selectors, a trigger, two-input elements AND, OR, an inverter, respectively, interconnected 1.

Недостатком известного устройства вл етс то, что оно не обнаруживает потери в последовательности более, чем одного импульса подр д, так как при обнаружении потери первого импу;1ьса иа его выходе устанавливаетс уровень логической единии;ы до по влени импульсов на входе Такое устройство может быть использовано только дл фиксации сбоев работы источника последовательности импульсов. Однако отсутствие некоторого числа импульсов в последовательности может быть не только в результате неисправной работы источника импульсов . Например, дл учета количества проход щих по конвейеру деталей через равные промежутки времени могут формироватьс импульсы напр жени .A disadvantage of the known device is that it does not detect losses in a sequence of more than one pulse more than once, since upon detecting the loss of the first imp, the level of a logical one is set at its output; before the appearance of impulses at the input used only for fixing failures of the pulse train source. However, the absence of a certain number of pulses in a sequence may not only be due to the malfunctioning of the source of pulses. For example, to account for the number of parts passing through the conveyor at regular intervals, voltage pulses may be generated.

Известно устройство дл обнаружени потери импульсов, содержащее квазиселектор , выход которого подключен к первомуA device for detecting a loss of pulses is known, comprising a quasi-selector, the output of which is connected to the first

входу элемента И, триггер, элемент задержки , вход которого объединен со входом Квазиселектора и подключен ко входной шине , а выход - к установочному входу триггера , вход «сброс которого соединен с выходом элемента И, а выход - со вторым входом элемента И 2.the input element And, the trigger, the delay element, the input of which is combined with the input of the quasi-selector and connected to the input bus, and the output - to the installation input of the trigger, the input “reset of which is connected to the output of the element And, and the output with the second input of the element And 2.

Однако известное устройство не обнаруживает потери более одного импульса подр д . При отсутствии двух и более импульсов подр д устройство выдает на выход только один импульс, а остальные не учитывает, так как устройство переходит в режим измерени интервала времени только от входных импульсов.However, the known device does not detect the loss of more than one additional pulse. In the absence of two or more pulses, the device sends only one pulse to the output, and does not take into account the rest, since the device switches to the time interval measurement mode only from the input pulses.

Цель изобретени - повыщение досто , верности обнаружени потери более одного импульса.The purpose of the invention is to increase the reliability of detecting the loss of more than one pulse.

Указанна цель достигаетс тем, что в устройство дл обнаружени потери импульсов , содержащее квазиселектор, вход которого подключен ко входной щине, а выход -This goal is achieved by the fact that the device for detecting the loss of pulses, containing a quasi-selector, whose input is connected to the input busbar, and the output is

Claims

An additional delay element and an inverter are added to the first input of the And element, and a delay element, with an additional delay element connected between the output of the And element and the second input of the quasi-selector, the output of which is connected to the input of the delay element, and the inverter is connected between the output of the delay element and the second input element I. The drawing shows the structural electrical circuit of the device for detecting the loss of pulses. The device contains quasi-selector 1, delay elements 2 and 3, inverter 4, element 5 I, input bus 6, output bus 7, the first input of the quasi-selector is connected to bus 6, the second input is connected to the output of the delay element 3, the output of the quasi-selector is connected to the inputs of the element 2 delays and element 5 I. The device operates as follows. In the time interval between the input impulses arriving at the bus b at the output of the quasi-selector 1, the voltage level is low (logical zero), therefore, the output of the inverter 4 is a high voltage level (logical unit), at the output bus 7, logic zero. Due to the coincidence of high voltage levels from the output of the inverter 4 of the quasi-Lector 1, element 5 I is opened and an impulse is sent to the output bus 7. Its duration is determined by the delay time of the signal on delay element 2. The high voltage level appearing at the output of the delay element 2 is changed by the inverter 4 to low and locks the element 5 I. The pulse from the output of the element 5 and is delayed by the delay element 3 and enters the input of the quasi-selective I. In order for the device not to generated pulses in the period between turning on the supply voltage and applying a pulse sequence to the device bus 6, element 5 And can be blocked by applying a low voltage to the auxiliary input (not shown). To operate the device, this input must be supplied with a constant high voltage level. The proposed device in comparison with the known detects the absence in the sequence of any number of pulses. The invention is a device for detecting a loss of pulses, a soda: a quasi-selector neighing, whose input is connected to the input bus and an output to the first input of the AND element, and a delay element, characterized in that, in order to increase the reliability of detecting the loss of more than one pulse, an additional one is introduced; - a delay element and an inverter, the additional delay element being connected between the output of the And element and the second input of the quasi-selector, the output of which is connected to the input of the delay element, and the inverter is connected between the output lementa delay element and the second input I. Sources of information received note in the examination 1.Avtorskoe № Certificate USSR 399057, cl. H 03 K 5/18, 1974.

2. USSR author's certificate No. 621081.,. cl. H 03 K 5/18, 1977 (prototype).