SU732799A1

SU732799A1 - Threshold device

Info

Publication number: SU732799A1
Application number: SU772550390A
Authority: SU
Inventors: Виктор Михайлович Барамыков
Original assignee: Специальное Конструкторско-Технологическое Бюро Вычислительной Техники
Priority date: 1977-12-02
Filing date: 1977-12-02
Publication date: 1980-05-05

Description

1one

Изобретение относитс к автоилатике и может быть использовано дл контрол величины знакопеременного напр жени посто нного тока.The invention relates to autoilatics and can be used to control the magnitude of the alternating DC voltage.

Известны пороговые устройства, содержащие модул тор, фильтры, усилитель-ограничитель , делители напр жени и элементы задержки 1.Threshold devices are known that contain a modulator, filters, an amplifier-limiter, voltage dividers, and delay elements 1.

Указанные пороговые устройства сложны и не обеспечивают достаточной точности.These threshold devices are complex and do not provide sufficient accuracy.

Наиболее близким по технической сущности к изобретению вл етс пороговое устройство, содержащее модул тор , вход которого вл етс входом устройства, и дифференциальный усилитель-ограничитель , выход которого подключен к управл ющему входу модул тора , а входы дифференциального усилител -ограничител соединены с выходами полосовых фильтров, вл ющимис выходами порогового устройства 2 ,The closest in technical essence to the invention is a threshold device comprising a modulator, the input of which is the device input, and a differential limiting amplifier, the output of which is connected to the control input of the modulator, and the inputs of the differential limiting amplifier are connected to the outputs of the bandpass filters Which are the outputs of threshold device 2,

Но известное устройство отличаетс относительно низкой эксплуатационной надежностью.But the known device is characterized by relatively low operational reliability.

Указанный недостаток обусловлен наличием в системе регенеративного избирательного усилител , который по существу вл етс недовозбужденным генератором, склонным к самовозбуждению при увеличении коэффициецта усилени усилител под воздействием какого-либо дестабилизиру5 ющего Фактора, например, температу|)Ы окружающей среды или напр жени источника питани . При этом на выходе cиcтe ы по витс ложный сигнал. Цель изобретени - повьпиениеThis disadvantage is due to the presence of a regenerative selective amplifier in the system, which is essentially an under-excited oscillator prone to self-excitation as the gain of the amplifier increases under the influence of any destabilizing factor, such as ambient temperature or supply voltage. In this case, the output of the system yields a false signal. The purpose of the invention is the leadership

О эксплуатационной надежности порогового устройства.On the operational reliability of the threshold device.

Дл достижени указанной цели в устройство введены истоковые повторители , входы которых подключены кTo achieve this goal, source repeaters are inserted into the device, the inputs of which are connected to

15 выходу модул тора, а выхсщы истоковых повторителей - к входу соответствующего полосового фильтра.15 to the output of the modulator, and the outputs of the source followers to the input of the corresponding band-pass filter.

На чертеже приведена структурна схема предлагаемого порогового устро20 йства.The drawing shows the structural scheme of the proposed threshold arrangement.

Пороговое устройство содержит модул тор 1, к выходу которого через истоковые повтсрители 2 и 3 подключены полосовой фильтр 4, настроенныйThe threshold device contains a modulator 1, to the output of which, through the source detectors 2 and 3, a band-pass filter 4 is connected, configured

Claims

25 to a low frequency (low-pass filter) and a band-pass filter 5 tuned to a high frequency (high-pass filter). The outputs of filters 4 and 5 are connected to the inputs of a differential 30-amp limiter b. connected to the control input of the modulator 1, the monitored voltage is applied to the input 7 of the modulator, and from output 8 the signal is removed, indicating that the input voltage has exceeded the threshold level of the systems. Devices responsive to the polarity of the voltage at input 7 are connected to outputs 9 and 10, Band Filters 4 and 5 can be either passive or active. If there is no signal at input 7, the magnitude of the gain factor of the limiting body b is chosen such that auto-oscillations in the system do not occur. When a positive polarity signal appears at the input 7, the modulator alternating current transfer ratio increases, and at a certain value determined by the device sensitivity threshold, in a closed loop modulator 1 - repeater 2 filter 4 - amplifier 6 - modulator 1 auto-oscillations occur at the filter tuning frequency of 4. At outputs 8 and 9, the voltage appears at the same part. When a negative polarity signal appears at the input 7, the voltage at the output of the modulator 1 is shifted in phase by 180 relative to the voltage at the output of amplifier b, and therefore self-oscillations occur already in the loop modulator 1 - repeater 3 filter 5 - amplifier b, modulator 1 is not a higher filter tuning frequency 5. At outputs 8 and 10, the voltage of the same frequency appears. The amplitude of self-oscillations in the system is limited to an optimal level by amplifier-limiter b. Source repeaters 2 and 3 allow matching the input resistances of filters 4 and 5 with the output resistance of modulator 1. As can be seen from the above, connecting the inputs of high-frequency and low-pass filters made in the form of bandpass filters through source repeaters to the output of the modulator allows you to exclude The known threshold device is a potentially unstable element - a regenerative selective amplifier and thereby increase the operational reliability and simplify the design of the device .. The formula from Bretenoux threshold device comprising a modulator. The input of which is the input of the device and the differential amplifier-limiter, the output of which is connected to the control input of the modulator, and the input of the differential amplifier-limiter are connected to the outputs of the bandpass filters, which are outputs of the threshold device, characterized in that reliability, the source repeaters, whose inputs are connected to the modulator output and the output repeaters to the input of the corresponding band-pass filter, are entered into the device. Sources of information taken into account in the examination 1. USSR author's certificate number 341003, cl. G 0.5 V 1/01, 1971.

2. USSR author's certificate No. 447674, CCL G 05 B 1/01, 1972 (prototype).

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