SU773645A1

SU773645A1 - Function generator

Info

Publication number: SU773645A1
Application number: SU792752835A
Authority: SU
Inventors: Александр Хафизович Мурсаев
Original assignee: Ленинградский Ордена Ленина Электротехнический Институт Им. В.И.Ульянова(Ленина)
Priority date: 1979-04-13
Filing date: 1979-04-13
Publication date: 1980-10-23

Description

1one

Изобретение относитс к устройствам , предназначенным дл формировани напр жени , пропорционального функции от входного напр жени и может быть использовано в аналоговых вычисли- 5 тельных машинах.The invention relates to devices designed to form a voltage proportional to a function of the input voltage and can be used in analog computing machines.

Один из известных функциональных преобразователей содержит широтно-импульсный модул тор, импульсные делители напр жени l .ЮOne of the known functional transducers contains a pulse width modulator, pulsed voltage dividers l.

Это устройство обладает сравнительно высокими инструментальнЕлми погрешност ми .This device has relatively high instrumental errors.

Наиболее близким по технической сущности к предлагаемому вл етс 15 функциональный преобразователь, содержащий широтнр-импульсный модул тор, выход которого соединен с управл ющим входом ключевого элемента, фильтрующий блок, источник опорного напр -20 жени , один выход, которого через первый масштабный резистор подключен к информационному входу ключевого элемента , выход которого присоединен ко входу фильтрующего блока, выход 25 фильтрующего блока вл етс выходом функционального преобразовател , второй выход источника опорного напр жени через второй масштабный резистор соединен со входом фильтрующего бло- 30The closest in technical essence to the present invention is a 15 functional converter containing a width-pulse modulator, the output of which is connected to the control input of a key element, a filtering unit, a source of reference voltage -20, one output, which through the first scale resistor is connected to the information input of the key element, the output of which is connected to the input of the filtering unit, the output 25 of the filtering unit is the output of the function converter, the second output of the source reference to p-scale voltage via the second resistor connected to the input of the filter 30 Bloch

ка, ко входу широтно-импульсного модул тора подключен источник входного напр жени , соединенные последовательно третий и четвертый масштабные резисторы 2.The input voltage source connected in series to the third and fourth scale resistors 2 is connected to the input of the pulse-width modulator.

Недостатком устройства вл етс относительна сложность функциональной схемы и высока погрешность, обусловленна большой чувствительностью выходного напр жени к ошибке широтно-импульсного модул тора.The disadvantage of the device is the relative complexity of the functional circuit and the high error due to the high sensitivity of the output voltage to the error of the pulse-width modulator.

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

Указанна цель достигаетс тем, что объединенные выводы третьего и . четвертого масштабных резисторов соединены с информационным входом ключевого элемента, свободный вывод третьего масштабного резистора подключен ко входу широтно-импульсного модул тора , свободный вывод четвертого масштабного резистора соединен с выходом фильтрующего блока.This goal is achieved by the fact that the combined conclusions of the third and. the fourth scale resistors are connected to the information input of the key element, the free output of the third scale resistor is connected to the input of the pulse width modulator, the free output of the fourth scale resistor is connected to the output of the filtering unit.

На чертеже изображена функциональна схема предлагаемого преобразовател .The drawing shows a functional diagram of the proposed Converter.

Claims

The device contains an input voltage source 1, a reference voltage source 2, a pulse-width modulator 3, a filtering unit 4, a key element 5, first, second, third and fourth scale resistors b, 7, 8 and 9, output 10. Functional the converter works as follows. The pulse width modulator 3 generates periodic pulses under the influence of an input signal, the relative duration of which is proportional to the input voltage in - KeV. (P where C is the pulse duration; T is the pulse following period; KQ is the proportionality coefficient. Key element 5 in each period is closed for the pulse action time is open during the remaining part of the period. At the output of the filtering unit.4 due to deep negative feedback The voltage is automatically set to such a voltage that the average for the period value of the sum of the currents at the input of the filtering unit 4 is equal to zero. This voltage equals vsi vj V - Q U).))) V m c. -ia КеУ -уКеС, where у, у, у-, у - conductivity of the first, second and third, fourth scale resistors 6, 7, 8 and 9, respectively; y is the conductivity of the large-scale feedback resistor of the amplifier of the filter unit 4; UO - magnitude for the same source or 2 reference voltage nor. In order to realize a negative coefficient O, it is sufficient to use key element 5, which is open for the duration of the pulses from the output of the pulse-width modulator 3 and is closed for the rest of the period time G From expression (II.) It follows that the proposed functional converter can realize random rational fractions the second order in the numerator and the first in the denominator, as well as the known device, while having a simpler functional circuit. The decrease in instrumental errors is due to the fact that the proposed functional converter reduces the output voltage sensitivity to the error of the pulse-width modulator 3. Thus, the proposed functional converter has a higher accuracy with a simpler functional circuit. The invention includes a functional converter containing a pulse-width modulator, the output of which is connected to the power input of the key element of the filter unit, the source of the reference voltage and one output of which through the first scale resistor is connected to the information input of the key element whose output is connected to the input of the filter unit, the output of the filtering block is the output of the functional converter, the second output of the source of the reference voltage cheg / ez An input voltage source connected in series to the third and fourth large-scale resistors is connected to the input of the filter unit, to the input of the pulse-width modulator, so that, in order to simplify and improve the accuracy, the combined outputs third and fourth th. scale resistors are connected to the information input of the key element, the free output of the third scale resistor is connected to the input of a pulse width modulator, the free output of the fourth scale resistor is connected to the output of the filter unit. Sources of information taken into account in the examination 1.Smolov V. B. and others. Time-impulse computing devices, Energie, 1968, p. 61-64, Fig.346.

2. Mursaev A. Kh., Smolov V. B., Ugryumov E. P. Precision high-speed multiplier-dividing device on current switches. Avtometri, 4, 1975, p. 67-71, fig. 1 (prototype).