SU723770A1 - Functional pulse-frequency converter - Google Patents

Description

The invention relates to measuring and computing equipment and can be used in information processing and conversion devices. ^uh

Known converters of voltage to the pulse repetition rate with a variable direction of integration [1]. ₁₀

Closest to the invention ^υ in technical essence is a converter containing a series-connected modulator, integrator and relay element [2].

However, its limited functional capabilities lead to the fact that the device performs only a directly proportional conversion of the input signal to the pulse repetition rate and does not allow 20 to perform dividing operations.

The aim of the invention is to expand the functionality of the Converter, namely the provision of the ability to perform dividing 25 operations.

This is achieved by the fact that in a functional frequency-pulse converter containing a serially connected source of the first signal of 30 l, a modulator, integrator and relay element, the output of which is connected to the control input of the modulator, an analog adder and a second modulator are connected in series to the input of the relay element the control input of which is connected to the output of the relay element, and the sources of the second signal and the reference voltage are connected to the inputs of the analog adder.

The drawing shows a block diagram of a converter.

The functional pulse-frequency converter contains a series-connected source 1 of the first input signal, a modulator 2, an integrator 3 and the modulator 5 are connected to the input of the relay element 8, the output of which is connected to the control inputs of the modulator 2 and 5.

The proposed pulse-frequency converter operates as follows.

The input signals U ₄ and and _a + U _o = have the same polarity. Both modulators are controlled by one relay element; therefore, their transmission coefficients are simultaneously equal to either minus 1 or plus 1 ·. Suppose that at the initial moment, the voltage at the output of the integrator 3 is 0, and at the output of the relay element 8 it is negative, i.e.,, ,, = 0, Ug <0. Then the coefficients (transmissions of the modulators are equal to K ₄ - = -1. The voltage = -C acts at the output of the integrator. The output voltage of the integrator is equal to and, .kiig »k (and dr

3 J 2 4 3 J 4 and has the same polarity as ° signals U _A and U _eM .

The output voltage of the second modulator is U ₅ = K ₅ - U _CI = —U _CM = = - (U _o + ϋ _ζ ), which has [polarity opposite to the polarity of the signals

With this element U _{3, in the} current state U „, U _2, and U _o = the period of operation of the converter, the voltage_and _{5 are} constant, and the voltage U - changes linearly. At time t _A , when the output voltage of the integrator and _s reaches the value C < _u + di, where is the threshold voltage of the relay element, i.e. equality holds ^and < ^{+ and} 5 = ^K s L ^and < ^dT does the element switch over? voltage does not change sign. As a result, the transmission coefficients of the modulators become equal to _r = K ₅ "+1. The following signals act at the input of the relay element: from the output of the integrator 3 U ₃ = Maj · V ^{t =} “ ^K ₃ j ^U A

About the output of the modulator 5. ⁴

U and U _CM · way, at the input of the relay there are bipolar sig · and U ₅ acting, and setting in, i.e. at constant const, during its half-relay output ϋ ₅ = ^Κ 5 «SN = U _CM .

Once the output voltage of the integrator reaches minus (aU + and _CM), switches the relay member. The process is then repeated.

In the steady state operating mode of the converter, the time during which the output voltage of the integrator 3 varies from 0 to (U _CM + δ U) is a quarter of the period of the output pulses T _1t ^and cm ⁺ l = ^K 4 ^{dX =} -4 ~ ^K 3 ^and < ^T .. P, - 4 (Price + li). 4 (U * + Uo + Δϋ) ^{and t} ϊς-ϋΤ— ------------>

_£ "_A_. _B_ ___ t 4 and _a + and _o + and _si

If we choose f and _o K3 - di, then

and.

Where

K _a

If where

= const

g then

Thus, the introduction of a second input signal source, a reference voltage source and a second modulator into the converter circuit expands the functionality of the device, namely, it allows to perform dividing operations.

Claims (2)

The invention relates to measuring and computing techniques and can be used in information processing and conversion devices. Voltage-to-pulse frequency converters are known with variable direction integrating 1. The closest to the invention in its technical essence is a converter containing a series-connected modulator, integrator, and relay element 2. However, its limited functionality means that the device performs only a direct proportional conversion of the input signal to the pulse frequency and not allows to perform division operations. The aim of the invention is to enhance the functionality of the converter, namely the provision of the possibility of completing division operations. This is achieved by the fact that, in the function of a frequency-pulse converter containing a series-connected source of the first signal, a modulator, an integrator and a relay element, the output of which is connected to the control input of the modulator, the series-connected analog adder and the second a modulator, the control input of which is connected to the output of the relay element, and the sources of the second signal and the reference voltage are connected to the inputs of the analog adder. The drawing shows the block diagram of the Converter. The functional frequency-pulse converter contains serially connected source 1 of the first input signal, modulator 2, integrator 3 and serially connected analog adder 4 and modulator 5, the second input source b and the reference voltage source 7 being connected to the inputs of the analog adder 4 , the outputs of the integrator 3 and the modulator 5 are connected to the input of the relay element 8, the output of which is connected to the control inputs of the modulator 2 and 5. The proposed pulse-frequency converter works with eduyuschim way. The input signals U and Uj + U U have the same polarity. Both modulators are controlled by one relay element; therefore, their transmission coefficients are simultaneously equal to either minus 1 or plus 1-. Suppose that at the initial moment the voltage at the output of the integrator 3 is O, and at the output of the relay element 8 is negative, i.e., Ug O. Then the coefficients (before the modulators are Ku. -1). At the output of the integrator The voltage KjU -C is in effect. The output voltage of the integrator is ravio., and has the same floor as the ° s signal and the UOM. At the output of the second modulator, the voltage Ug Kg-- U, s (l - - {Up + Uj), which has the | polarity opposite to the polarity of the signals and and, 0. Thus, different polarity and and Ug act at the input of the relay element, moreover, in the steady state, i.e. with constant and,, and and Uo const, during the half period of the converter operation, the voltage Tsa is constant, and the voltage Ug- varies according to a linear law At time t, when the output the voltage of the integrator U reaches the value U ,; + whether the differential threshold voltage of the relay element, i.e. equality 5, UCH switches the relay element, the voltage at its output changes sign. As a result, the modulus transfer factors become equal to K, j K +1. At the input of the relay element, the signals: from the output of the integrator 3 3 -KaKsG u.dt -K,} and at and the output of the modulator 5. 5 5 CD Uc As the output voltage of the integrator reaches minus (li + Uc), switching relay element. The process then repeats. In the steady state mode of the converter, the time during which the output voltage of the integrator 3 varies from 0 to (and + d) is a quarter of the follow-up period of the output pulses T 4 UCH Кз | and, dt -i-K and, T „Ф l (UcH + AU), 4 (Ua + Uo + uU) And A tr. - and „+ UCH If you select Up - whether, then i- L where o, If Uo - yy, and const, then Thus, the introduction into the circuit of the converter of the second input source, the source of the reference voltage and the second modulator expands the functional capabilities of the device, namely, it permits the performance of division operations. A functional frequency pulse converter comprising a first signal source connected in series, a modulator, an integrator and a relay element, the output of which is connected to the control input of the modulator a, which, in order to extend its functionality, to the input of the relay the element is additionally connected in series an analog adder and a second modulator, the control input of which is connected to the output of the relay element, and to the inputs of the analog adder second signal sources are connected and a reference voltage. Sources of information taken into account in the examination 1. Gutnikov B.C. The use of operational amplifiers in measurement technology. -L., Energie, 1975, .106-107. 2. USSR author's certificate No. 489217, cl. H 03 K 13/02, 1975 (prototype).