SU1228306A1 - Period-to-voltage converter - Google Patents

Abstract

This invention relates to electrical measuring technology. It can be used in time-frequency automation and control systems to obtain a signal proportional to the period. The purpose of the invention — improving reliability — is achieved by eliminating one conversion channel. The converter contains standby multivibrators 1 and 2, keys 3 and 4, integrator 5, containing resistor 6, capacitor 7, and memory 8. Operation of the converter is explained in the time diagrams in the description of the invention. 2 Il. s (lu to 00 SA O O) Ugt / jr f (/ g;

Description

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Ilififiju-TeHHf; 1 H () gi and G1 ;: to measure (M1i 1 e. ;; iini technique and southeast n |, pch applied on the frequency and time systems of automatics and control to obtain a signal proportional to the period.

The purpose of the invention is to increase the reliability of the converter by eliminating one conversion channel.

FIG. 1 shows a functional converter circuit; in Fig. 2, time diagrams of the converter operation (a is the input signal; b is the output pulses of the first standby multivibrator, c is the output pulses of the second standby multivibrator, g is the integrator output voltage, d is the output signal).

The converter contains pending multivibrators 1 and 2, keys 3 and 4,

5 constant voltage integrator.

containing a resistor 6, a capacitor 7, a memory device 8 and a resistor 9. Moreover, the input of the integrator 5 is one of the terminals of the resistor 6, the other terminal of which is connected to the input of the operational amplifier, one of the capacitor plates 7 and through the first switch 3 and the second resistor 9 connected to the second plate of the capacitor 7, the output of the operational amplifier and the potential input of the storage device 8, the output of which is the output of the converter, and the input bus of which is the input of the first multivibrator 1. The first output of the first second multivibrator 1 is connected to the control input of the storage device 8 and the input of the second multivibrator 2, the output of which is connected to the control input of the first switch 3, the second output of the first multivibrator 1 is connected to the control input of the second switch 4, through which the input of the integrator 5 is connected with reference voltage.

The device works as follows.

In the initial state, the contacts of the key 3 are closed, the contacts of the key 4 are open, there is no signal at the control input of the storage device 8.

At the moment the input signal arrives, the waiting multivibrator 1 generates a pulse, during which time it sends a signal from the inverse output to the opening of the contacts of the key 4, and from the direct output

five

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5 0 j 0 5

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five

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riyjif.c l. And neiir- iaHHi H И1, х -) of the curb-like Negative integrator S on the impulse UNCTpoi icTiio 8. At the end of the impulse of the waiting multivibrator 1, the multivibrator 2 is triggered and the contacts of keys 3 and 4 start and run d the integrating capacitor to voltage ,, / R, where Uf, is the voltage of the source of constant voltage. In this case, the voltage and, determines the minimum value of the measured period

T ,, h ui rrc.

At the end of the output pulse of the waiting multivibrator, the contacts of the switch 3 open and the capacitor of the integrator starts charging through the closed contacts of the switch 4 from the constant voltage source U. The charge of the capacitor continues until the next pulse of the input signal arrives at the converter input. After that, the processes into the transformation take place in the same way as described.

Claims (1)

Invention Formula A period-to-voltage converter containing an integrator, the input of which is. One of the terminals of the resistor, the other output of which is connected to one of the capacitor plates and the input of the operational amplifier, the output of which is connected to the second plate of the capacitor, In order to increase reliability, the first and second multivibrators, the first and second keys, the second resistor and the memory device are introduced into it, the input bus of the device being the input of the first multiviral bratra, the first output of which is connected to the input of the second multivibrator and the control input of the storage device, the output of which is the output of the converter, and the input of the storage device is connected to the output of the integrator via the second resistor and the first switch to the input of the operational amplifier, the control input the first switch is connected to the output of the first multivibrator, the reference voltage is supplied to the input of the integrator via the second switch, and the control input of the second switch is connected to the second output of the first multivib Ator. 6 -,  t ig.2