SU645206A1 - Analogue storage - Google Patents

Description

The analog storage device contains an integrator 1 implemented on a capacitor 2, first and second summing resistors 8, 4, connected respectively to the first and second summing inputs of the integrator /, and operational amplifier 5, optro 6, consisting of emitter 7 oitron and fotoiriemnka 8 , summing the operating center 9 with the input summing resistors W, 11, filter 12, coupling capacitor 13, voltage converter 14 - frequency, element 15, key 16 and generator 17 of pulses (sources of positive and negative) tion voltages are not shown in) FIG.

The device works as follows.

In the recording mode of the memorized base factor, the key 16 is open, and the negative feedback chain covering the device through the PI / 5 element is broken.

The integrator / integrates the control input signal of the block input to its first summing input.

The closure of the key 16 puts the device in memory mode of the table factor. At the same time, the first input of the element 15 is supplied with permitting pulses of a constant frequency and amplitude from the output of the generator 17. These same pulses are fed through a resistor // to the input of the operational amplifier 9. The amplitude of the pulses at the output of the amplifier 9 is directly proportional to the resistance of the optocoupler 8 which is determined by the magnitude of the luminous flux of the emitter of the optocoupler 7, given by the output voltage of the integrator /. Next, the pulses through the coupling capacitor 13 are fed to the input of the voltage-to-voltage converter 14, which produces pulses whose frequency is a function of the amplitude of the input pulses. The output pulses of the voltage-frequency converter 14 through the element 15 are fed to the second integrator's summing input I, and thus the negative feedback circuit covering the device is closed.

Depending on the direction of the drift of the whole circuit, the voltage at the output of the integrator / begins to change. In this case, the luminous flux of the emitter 7 changes, which, in turn, causes a change in the resistance value of the photodetector 8. The amplitude of the pulses at the output of the operational amplifier 9 changes and correspondingly. but the frequency of the pulses at the output of the converter 14 until a partial coincidence in time of the pulses on the element 15 occurs. In this case, it produces the resultant pulse supplied to the second integrating input of the integrator. The polarity of this pulse is chosen so as to compensate for the drift of the integrator / and all elements of the circuit.

The information input of the analog storage device is supplied with a signal t / Bx ,, which is multiplied by the memorized scale factor a. The output voltage of the device, taken from the output of the filter 12 is equal to

f / b, x (0 (),

where R 10 - the resistance of the input summing resistor 10. The coefficient a is equal to

a g.: (-t -4 .. U ,, (t} dt), /

where I is the coupling coefficient of the emitter 7 with the photodetector 8 of the optocoupler 6;

RQ - Average Resistance

photodetector 5;

T is the integrator time constant /.

The range of variation of the compensating signal in this device is such that it allows you to hold a given scaling factor and changes over the entire range of the signal at the control input. Therefore, there is no need to install an additional key for switching the control signal f / v,.,.

Only after breaking the feedback circuit using the key 16, the control input signal f / n,., Begins to be integrated by the device.

The coverage of the optocoupler 6 by the negative feedback circuit on the variable component allows to compensate for the instability of the light flux of the emitter 7 and the aging of the photodetector 8 in the interval of storing the scale factor.

This ABC allows you to multiply a variable input sigial by a memorized variable scaling factor a, which significantly extends its range of application.

Claims (2)

1. US Patent No. 3783393, cl. G 06 G 7/18, 1974. 2. US Patent No. 3784919, cl. G 06 G 7/18, 1974.