SU439821A1 - Device for multiplying two voltages - Google Patents

Description

one

The invention relates to analog computing and can be used in computing devices, operating with frequency pulses and alternating voltages.

Devices of a similar purpose are known, operating with values represented as a pulse frequency and containing a key, an integrator, a coincidence element, and a limiter.

A disadvantage of the known devices is low accuracy and reliability.

The aim of the invention is to improve the accuracy and reliability of the device.

The indication of the goal is achieved by the fact that the described device contains additionally a limiter, an inverter, two triggers and a key. The input of the additional key is connected to the input of the additional terminator, and the output is connected to the input of the integrator. The output of the additional limiter is connected via an additional inverter to the first input of the nerve additional trigger, the second input of which is connected to the output of the second additional trigger, and the output is connected to the input of the additional key. In this case, the inputs of the second additional trigger are connected respectively to the output of the additional limiter and the device output.

The block diagram of the device shown in the drawing.

An alternating current source 1 is connected via switch 2 to the input of integrator 3. The same source is connected to input of limiter 4, the output of which is connected to input 5 of trigger 6 directly and to input 7 of trigger 8 via inverter 9. Input 10 of trigger 6 is connected to source 11 of the signal specified in the form of a pulse frequency. The output of the trigger 6 is connected to the input 12 of the trigger 8. The output of the trigger 8 is connected to the control input of the key 2 and through the differentiating chain 13 to the input of the coincidence element 14, the second input of which is connected to the output of the integrator 3. The output 15 of the element 14 coincides with the output device, is connected to the input 16 of the additional trigger 17. Input 18 of this trigger

through an additional limiter 19 is connected to the source of the on-voltage volt- age of ne imme1ugo current. This source is connected to the input of the integrator 3 via an additional key of 2 G. Connect the key switch 21 to the output of an additional trigger 22, input 23 of which is connected to the output of the trigger 17, and input 24 to the output of the limiter 19 via an additional inverter 25.

The device works as follows.

The AC signal coming from source 1 is converted by limiter 4 into square pulses (the same but opposite polarity pulses are at the output of inverter 9). Similar transformations are produced with the reference signal of source 20 when the limiter 19 and inverter 25 change; at the same time, at the outputs of these devices receive rectangular pulses. The incoming from the source AND pulses with an input frequency set a single level at the output of the trigger 6, and a negative voltage drop across the output of the limiter 4 sets the zero level of the output voltage of the trnger 6. The output voltage of the trigger 8 is set to and the output voltage of the integrator 3 decreases. The occurrence of a negative voltage across the input 7 of trigger 8 sets its output voltage to “O, key

2 is closed. The pulses appearing at the output of the differentiating chain 13 pass the output 15 of the coincidence element 14 only when the output voltage of the integrator 3 falls below the threshold voltage of the coincidence element 14. The output voltage of the trigger 17 is set to "1. This voltage is set to "On the negative voltage drop at the output of the limiter 19. A negative voltage drop sets to" I output trigger voltage 22. Key 21 opens, and the load is integrated by the integrator 3. The output voltage of the integrator will increase. A negative voltage drop from the inverter 25 sets the output voltage of the trigger 22 to "O, the key 21 is closed.

Since the output voltage of the integrator

Always standing within certain limits, over a large period of time the sum of the areas of the currents at the input of the integrator 3 can be considered equal to zero. In this case, the frequency of the output pulses is proportional to the frequency of the input pulses, multiplied by

on the ratio of the input voltage to the reference voltage.

The high accuracy of the device operation is achieved by the fact that: non-switching of keys occurs at small instantaneous values of the alternating current voltage; when integrating the input and reference voltages, the spreading time constant of the integrator is determined only by the spread of the resistances of the open

keys, whose influence can be neglected by choosing a sufficiently large input resistance of the integrator; the integrator’s own time constant does not affect the accuracy of the device;

It is chosen in such a way as to exclude the possibility of saturating the integrator during the integration time of one or two wavelength parallels of the reference signal.

Subject invention

A device for multiplying two voltages containing a key, an integrator, a matching element and

a limiter whose input is connected to the key input, and the output through the inverter is connected to one trigger input, another input of which is connected to the output of the second trigger, and the output is connected to the key input and, through a differentiating chain, in order to increase accuracy and reliability, it additionally contains a limiter, an inverter, two triggers and a key, with the input of the additional key connected to the input of the additional limiter, and the output connected to the input of the integrator, the output of the donol Tel'nykh limiter via an additional inverter is connected to a first input of the first additional flip-flop, a second input coupled to an output of the second further flip-flop, and an output coupled to the input of an additional key, wherein the inputs (second) of the additional flip-flop are respectively connected to the output of an additional slicer and output of the coincidence element.

15

18

) b

23