SU1605248A1 - Device for modeling photo-pulse revolutions transmitter - Google Patents

Abstract

The invention relates to the field of automation and is intended to form two pulse sequences with a frequency proportional to the input voltage, shifted in phase by an angle, the sign of which is determined by the polarity of the input voltage. It can be used when setting up automatic control systems for the rotation frequency of objects. The aim of the invention is to improve the accuracy of the simulation. The device contains two voltage converters — frequency, two NOT elements, a reversible counter, and two multiplexers. The device makes it possible to completely eliminate the error in the formation of two pulse sequences associated with a violation of the duty cycle and the phase angle between them. 2 Il.

Description

The invention relates to automation, is intended to form two pulse sequences with a pulse following frequency, proportional to the input voltage, and shifted in phase by an angle, the sign of which is determined by the polarity of the input voltage, and can be used when setting up automatic rotation frequency control systems. in which photo-pulse sensors are used as sensors of adjustable angular velocity.

The purpose of the invention is to improve the accuracy of modeling.

FIG. 1 shows a diagram of the device; in fig. 2 - timing charts of the device.

The device contains the first 1 and second 2 inputs, the first 3 and second variable limiting resistors, the first 5 and second 6 voltage-frequency converters, outputs 7 and 8, the first 9 and second 10 elements are NOT, the reversing counter 11, the first 12 and the second 13 multiplexers,

As a voltage-frequency converter, a KR 1108PP1 chip is used, and multiplexers are made on the basis of a K155KP2 chip.

An unbalanced signal is applied to the inputs 1 and 2 of the device, and for correctness of the diagrams in FIG. 2 input 2 is connected to the zero potential bus.

but

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The device works as follows.

In the absence of an input signal at inputs 1 and 2, the converters 5 and 6 voltage - the frequency at the outputs of the pulses do not produce, the output potential is O, the inputs of the reversible counter 11 are logical 1, the counter is in any of the states and at outputs 7 and 8 are present potentials depending on the state of the stopped reversing counter 1 1.

When the input signal and g O converter 5 voltage - the frequency begins to form positive polarity pulses, the frequency of which is proportional to the input voltage (at the output of the converter 6 logical O)

The pulses. From the output of the converter 5, the voltage — the frequency, the element HE 9 passed, are fed to the summing input of the reversible counter 11 (at the subtracting input of logic 1), transferring it to new states. Each state of the counter 11, in accordance with the state of the lower information bits, forms at the output of multiplexers 12 and 13 two pulse sequences whose frequency is proportional to the input voltage, the duty cycle is equal to two, the phase shift is equal to 90.

When changing the polarity of the input signal when U.g ,, the converter 5 voltage - the frequency of the pulses does not produce (the output is logical O), but then it begins to generate pulses of the converter 6 voltage - the frequency. The pulses from the converter 6 through the element NOT 10 are fed to the subtractive input of the reversible counter 11. The latter starts to work on the subtraction and in accordance with the state of the lower information bits arriving at the address inputs of the multiplexers 12 and 13, forms at their outputs two pulse sequences, phase the shift between which is equal to minus 90.

The calculation of the steepness of the converters 5 and 6 voltage - frequency can be carried out as follows. Suppose that at the input voltage Ug), +10 V, the engine should have n 4500 rpm and has a photopulse on its shaft

sensor with the number of divisions per revolution z 1000.

Then the frequency of the pulse sequences with Ugy 10 V should be

p p rpm n - 60 Z 75 kHz.

Since the period of pulse sequences is formed by the four states of counter 11, the input frequency of counter 11 (output frequency converters 6 and 5) must be

f f Y 300 kHz.

Thus, the tuning of the slope can be made by applying to the inputs 1 and 2 of the input voltage +10 V and setting the outputs of the converters 5 and 6 of the frequency 30 kHz using resistors 3 and k.

The linearity of the frequency of the pulse sequences from the input voltage is provided by the linear characteristic of the transducers 5 and 6.

Thus, the proposed device makes it possible to virtually eliminate the errors in the duty cycle and phase shift of the generated pulse sequences, i.e. improve accuracy.

Claims (1)

Invention Formula A device for simulating a photopulse rotational frequency sensor, comprising a first voltage-frequency converter and a reversible counter, characterized in that, in order to improve the modeling accuracy, it further comprises a second voltage-frequency converter, two HE elements, two multiplexers and two variable limiters a resistor, the non-inverting input of the first voltage-frequency converter being the first information input of the device and through the first variable limiting cut the source is connected to the inverting input of the second voltage converter — the frequency, the non-inverting input of which is the second information input of the device and through the second variable limiting resistor is connected to the inverting input of the first voltage converter — the frequency whose output the first element is NOT connected to the summing dynamic input of the reversible counter, the subtractive dynamic input of which is not connected to the output of the second voltage / frequency converter through the second element; the outputs of the first and second low-order bits of the reversible counter are connected to the address inputs of the first and second multiplexers, respectively, strobe the inputs which are connected to the zero potential bus, and the outputs are the outputs of the device, the first and second the information inputs of the first multiplexer are connected to the unit potential bus of the device, and the third and fourth information inputs are connected to the device zero potential bus, the first information input of the second multiplexer is connected to the zero potential bus, the second and third information inputs are connected to the device single potential bus, and the fourth information the input of the second multiplexer is connected to the device zero potential bus. and,