SU546902A1 - Optoelectronic functional transducer of three variables - Google Patents

Description

The invention relates to analog computing and measurement technology and can be used both as a standalone functional converter and as part of information and measurement systems where it is necessary to transform three independent variables.

Optoelectronic functional converters of several variables are known. One of the known transducers is used for squaring the DC signal. It contains two photoresistors, each of which is included in one of the arms of the corresponding resistive bridge, the first diagonals of which are connected to one amplifier input and to the node of a stabilized voltage source, and the second diagonals are connected in series and connected through a resistor to the other input of amplifier 1. The other known the technical solution is an optoelectronic functional converter that allows the construction of electrical signals to a fractional degree. It contains a light source optically connected to photoresistors included in the respective bridge circuits and connected to the output of a differential amplifier, one input of which is connected to the diagonal of the first bridge circuit, and the second is connected through a resistor to the first source

input signal, the second input source is connected to the diagonal of the last bridge circuit, and the diagonals of each bridge circuit are connected to the corresponding diagonal of the previous and subsequent bridge circuits and the corresponding output of the device 2. And the closest to the invention technical1 M solution is an optoelectronic functional converter of several variables containing multiplying optoelectronic cells, the outputs of which are connected to the corresponding inputs of the output operational amplifier, other whose inputs are associated with inputs

the converter, and the source of the reference voltage, connected to the corresponding inputs of each multiplying optoelectronic cell 3. However, the known functional converters are characterized by narrow meters.

class of reproducible functions.

The aim of the invention is to expand

class of reproducible functions. In the described converter, this is achieved by

that in it the first input is connected to the first

the inputs of the first, fourth and seventh optoelectronic cells and with the second inputs of the first and sixth optoelectronic cells; the input of the converter is rubbed into the first inputs of the second and fifth optoelectronic cells and with the second inputs of the second and fourth

optoelectronic cells, and the third input of the transducer is connected to the first inputs of the third and sixth optoelectronic cells and to the second inputs of the third and fifth optoelectropic cells, and the output of the fifth optoelectropic circuit is connected to the second input of the seventh optoelectronic chip.

In addition, in the described converter, each optoelectronic cell contains a differential amplifier, the first input of which is connected to the first input of the cell through the first photoresistor, and the second input of the differential amplifier is connected to the output voltage source through a limiting resistor, a light source connected to the output of the differential amplifier and an operational amplifier, in feedback of which a second photoresistor is switched on, which, like the first photoresistor, is optically coupled to a light source, d operational amplifier through a scaling resistor connected to the second input cell and the output of the operational amplifier is coupled to the output cell.

The drawing shows a schematic diagram of the converter being described and the designations adopted: 1-7 optoelectronic cells; 8-10 - converter inputs; 11 - 17 - outputs of optoelectronic cells; 18 - converter output; 19 - output operational amplifier; 20 is a source of reference voltage. The source 20 is connected to the corresponding, their inputs 21-27 optoelectronic cells 1-7, each of which contains a differential amplifier 28, the first photoresistor 29, the limiting resistor 30, the light source 31, the operational amplifier 32, the second photoresistor 33 and the scale resistor 34. The output operational amplifier 19 includes feedback circuit resistor 35 and input scale resistors 36-45.

The first Ux, the second Uy and the third (/ Z input signals) are respectively fed to the inputs 8-10 of the converter. At the output 11 of the first optoelectronic cell 1, a signal is generated and, at the output 12 of the second optoelectronic cell 2, a signal equal to Y,

A signal equal to U will appear at the output 13 of the third optoelectronic cell 3, a signal equal to the output 14 of the fourth optoelectronic cell 4 will be generated and a signal equal to UyU will be generated at the output of the 15th fifth optoelectronic cell 5, and a signal equal to Ux-U, and the output 17 of the seventh optoelectronic cell 7, a signal equal to Ux-UyUz. As a result of the summation of these signals by a summed output operational amplifier 19, the output signal f / out of the converter output 18 is equal to the output (g.,.) A, and + a, Uy -f a, U, +

-} - bJJl + b, Ul + b ,, UJJ +

 + cJJyU--} c, UJJ, + dUJJyU,

With the identical circuit parameters of optoelectronic cells 1-7, you can put the input scale resistors

  ..... then

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Th

 vso

bz - b -

 with. with, - with, Uo-RsiRsb Ro-K

thirty

a-d

0 34 36

The use of multiplying optoelectronic cells in the converter makes it possible to increase the interference and interference of the circuits by introducing galvanic isolation. At the same time, the reproduction error of the function of three variables in the range of 5-1000 Hz does not exceed 2% when the amplitude of the input signals varies from 0.2 to 9 V. The identity of multiplying optoelectronic cells allows

make also a sliding reservation.

Claims (3)

1. An optoelectronic functional converter of three variables, containing multiplying optoelectronic cells, the outputs of which are connected to the corresponding inputs of the output operational amplifier, the other inputs of which are connected to the inputs of the converter, and a source of reference voltage, which is connected to the corresponding inputs of each multiplying optoelectronic cell, that, in order to expand the class of reproduced functions, in it the first input is connected to the first inputs of the first, fourth and seventh optoelectric nnyh cells and to the second inputs the first and sixth optoelectronic cells, the second input of the converter is connected with the first inputs of the second and fifth optoelectronic cells and the second inputs of the second and fourth optoelectronic cells, and the third input of the converter is connected to the first inputs of the third and sixth optoelectronic cells and to the second inputs of the third and fifth the optoelectronic cells, and the output of the fifth optoelectronic cell is connected to the second input seventh optoelectronic cell. 2. An optoelectronic functional converter of three variables, characterized in that each optoelectronic cell contains a differential amplifier, the first input of which is connected to the first input of the cell through the first photoresistor, and the second input of the differential amplifier is connected to the output of the reference voltage source light associated with the output5 the house of the differential amplifier, and the operational amplifier, in the feedback of which the second photoresistor is switched on, which, like the first otoresistor, is optically connected to the light source, the input of the operational amplifier is connected to the second input of the cell through a scale resistor, and the output of the operational amplifier is connected the output of the cell. Sources of information taken into account in the examination: 1. USSR author's certificate No. 337791, M. Кл.г G 06G 7/20, 03.20.70. 2. Authors certificate of the USSR L 449353, M. Kl.2 G 06G 9/00, 28.06.73. 3. USSR author's certificate No. 489123, M. Kl.2 G 06G 9/00, 11.06.74. fr / i L I / - PPPMPPPP lUULJUULlUUlJU fs. b.,.,: | v: i iX. 4i: 5 J 37Jo 1 B3SW 4J 2