RU2193794C2 - Parameter-to-code converter - Google Patents

Parameter-to-code converter Download PDF

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RU2193794C2
RU2193794C2 RU2000101958A RU2000101958A RU2193794C2 RU 2193794 C2 RU2193794 C2 RU 2193794C2 RU 2000101958 A RU2000101958 A RU 2000101958A RU 2000101958 A RU2000101958 A RU 2000101958A RU 2193794 C2 RU2193794 C2 RU 2193794C2
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output
comparator
voltage
input
parameter
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RU2000101958A
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RU2000101958A (en
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В.А. Курылев
А.Ф. Королев
Г.В. Королев
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Государственное унитарное предприятие Специальное конструкторское бюро "Ротор"
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Abstract

FIELD: automatic control; digital control systems. SUBSTANCE: proposed converter relates to digital control systems requiring signals in the form of digital codes to function as setting and feedback signals and using setting devices and feedback sensors with output parameters shaped in the form of ac voltage whose amplitude is a function of parameter being measured. It has series- connected pulse generator, power unit, sensor with varying output- voltage amplitude, and first comparator; pulse generator output is also connected to complementing input of time-interval meter where digital code is built up across its output; novelty is introduction of second comparator and AND circuit; power unit output is connected to second input of first comparator; outputs of first and second comparators are connected to first and second inputs of AND circuit whose output is connected to enable input of time-interval meter. EFFECT: simplified design of converter. 2 dwg

Description

 The proposed device relates to the field of automatic control, in particular to digital control systems, where signals in the form of digital codes are required as reference and feedback signals, and devices whose output parameter is formed as an alternating voltage are used as driving devices and feedback sensors whose amplitude is a function of the measured parameter.
 Known converter parameter - code [1], containing a master oscillator connected to the input of the phase splitter, the outputs of which form two sinusoidal voltages, shifted relative to each other by 90 degrees. The indicated voltages are fed through amplifiers to the in-phase and quadrature stator windings of a rotating transformer. A rotating transformer acts as a sensor, in which the measured angle is the angle of rotation of the shaft, and the output voltage is formed on the sine and cosine rotor windings in the form of an alternating voltage, the phase and amplitude of which is a function of the angle of rotation of the shaft of the rotating transformer. Using the known device [2], containing the first and second zero-organs connected to the common-mode and sinus windings of a rotating transformer, respectively, the outputs of the zero-organs are connected to the setting inputs of the trigger, the output of which is summed according to the And circuit with the output of the counting generator, and circuit output And connected to the input of the binary counter, you can generate a digital code, which is a function of the angle of rotation of the shaft of a rotating transformer.
 The disadvantage of this parameter-code converter is its complexity, this is due to the fact [1] that in order to ensure the required conversion accuracy it is necessary to very accurately maintain equal amplitudes and phase shift of voltages supplied to the in-phase and quadrature windings of a rotating transformer. This greatly complicates the possibility of technical implementation of the presented parameter-to-code converter.
 The parameter – code converter [3] is also known, which contains a rotating transformer, the in-phase winding of which is supplied with an alternating sinusoidal voltage, and the quadrature winding is short-circuited, the sinus winding voltage of the rotating transformer and the voltage shifted to the phase-shifting unit by 90 degrees from the cosine are applied to the input of the first summing amplifier windings of a rotating transformer, the second amplifier subtracts the voltage from the phase-shifting unit and the sinus winding of the rotating transformer. At the outputs of the first and second amplifiers, voltages are formed whose phase is a function of the angle of rotation of the rotating transformer. When connecting the outputs of the first and second amplifiers to the inputs of the first and second zero organs of a known device [2], a digital code will be generated at the output of the binary counter, which is a function of the doubled angle of rotation of the shaft of a rotating transformer.
 The disadvantage of this parameter-code converter is its complexity, which is due to the fact that to ensure the required conversion accuracy it is necessary to very accurately maintain the unity of the transmission coefficient of the phase-shifting unit, as well as the equality of 90 degrees of the phase shift formed by it. This greatly complicates the possibility of technical implementation of the presented parameter-to-code converter.
 The closest in technical essence to the proposed device is a parameter-to-code converter [4], consisting of a series-connected pulse generator and a power supply unit that generates an alternating sinusoidal voltage to power the sensor, the output voltage of which is formed as an alternating voltage with an amplitude that is a function of the measured parameter . A sine-cosine rotary transformer is used as a sensor. Voltages from the sine and cosine windings of the sensor are supplied to the octant switch, which forms the highest bits of the output digital code. The first output of the octant switch through a series-connected phase-shifting element that provides a 90-degree shift, and the first rectifier is connected to the first input of the comparator. The second output of the octant switch through a second rectifier is connected to the second input of the comparator. The output of the comparator is connected to the first input of the time interval meter, the second input of which is connected to the output of the pulse generator. A digital code is generated at the output of the time interval meter, which is a function of the measured parameter of the sensor — the angle of rotation of the shaft of a rotating transformer.
 The specified Converter provides the formation of a digital code with an intermediate conversion of the amplitude in the time interval.
The disadvantage of this parameter-to-code converter is its complexity, this is due to the fact that to ensure the required conversion accuracy it is necessary:
1) precisely maintain the equality of the amplification factors of the sine and cosine voltages from the outputs of the rotating transformer to the inputs of the comparator;
2) accurately maintain a 90 degree shift of the phase-shifting element.
 These requirements represent a rather large technical complexity and lead to a significant complication of the device during its technical implementation.
 The technical result of the invention is the simplification of the parameter-to-code converter. The technical result is achieved by the fact that in the converter the parameter is a code that contains a pulse generator, a power supply, a sensor with a varying amplitude of the output voltage and a first comparator, the output of the pulse generator is connected to the counting input of the time interval meter, at the output of which a digital output code is generated, additionally introduced a second comparator and circuit And, the output of the power supply is connected to the second input of the first comparator and the input of the second comparator, the outputs of the first and second comparators are connected to the first and second inputs of the circuit AND, respectively, the output of which is connected to the resolution input of the time interval meter.
As a result of the introduction of these elements, the parameter-to-code converter is simplified. Simplification is due to the fact that:
1) to form a time interval, the value of which is a function of the measured parameter, a phase shift is used between the supply and output voltage of the sensor with a varying amplitude of the output voltage. The indicated phase shift is not specially formed, but the natural phase shift of the alternating voltage is used, which is formed in the sensor with a varying amplitude of the output voltage, which leads to a simplification of the parameter-code converter;
2) there is no need for preliminary analog processing of the sensor output signal, comparison of two phase-shifted AC voltage signals is carried out directly on the first comparator, this leads to a simplification of the parameter-code converter.
 The technical result is achieved through the use of a natural phase shift of the sensor with a varying amplitude of the output voltage. Analysis of known technical solutions allows us to conclude that there are no technical solutions having similar features that distinguish the claimed device from the prototype, and, therefore, the proposed parameter-to-code converter has significant differences from the known technical solutions.
 In FIG. 1 shows a diagram of the proposed Converter parameter is a code, and figure 2 is a diagram explaining its operation.
 The parameter-to-code converter contains a pulse generator 1, a power supply 2, a sensor with a varying amplitude of the output voltage 3, and a first comparator 4, the output of the pulse generator 1 is connected to the counting input of the time interval meter, the output of which is the output digital code, the output of the power supply 2 is connected to the second input of the first comparator 4 and the input of the second comparator 6, and the outputs of the first 4 and second 6 comparators are connected to the first and second inputs of the circuit And 7, the output of which is connected to during the resolution of the time interval meter 5.
 The proposed converter parameter - code works as follows.
The pulse generator 1 generates high-frequency voltage pulses - figa), which are received:
1) to the counting input of the time interval meter 5 and are used to form a digital code at its outputs;
2) to the input of the power supply 2.
The power supply 2 in the General case, similarly to the selected prototype, is a frequency divider connected via a read-only memory to a digital-to-analog converter. At the output of the power supply 2, an alternating sinusoidal voltage U 2 is formed - Fig.2b), which is described by the expression
U 2 = U n • sinωt, (1)
where U 2 is the output voltage of the power supply 2;
U n is the value of the amplitude of the output alternating voltage;
ω is the circular frequency of the alternating voltage.
The voltage from the output of the power supply 2 is supplied to the input of the sensor with a varying amplitude of the output voltage 3. The amplitude of the output alternating sinusoidal voltage of the sensor 3 is a function of the measured parameter. As a sensor with variable amplitude 3, a rotating transformer [5], an inductive or induction converter [6] can be used. In the General case, the output of the sensor 3 is formed by an alternating sinusoidal voltage, described by the expression
U 3 = f (x) • U a • sin (ωt + b), (2)
where f (x) is the function of the dependence of the amplitude of the output voltage on the parameter X measured by the sensor 3, this dependence can be sine, cosine for the angle of rotation of the shaft of a rotating transformer [5] or linear for moving the armature of an inductive or induction converter [6] and so on;
b is the phase shift between the supply and output voltage of the sensor 3.
Fig.2b) shows the voltage U 3 , for clarity, the presentation at time intervals (t 1 - t 4 ), (t 4 - t 5 ), (t> t 5 ) the measured parameter X has different values, and in accordance with this the magnitude of the amplitude of the voltage U 3 at these time intervals also has different values.
The first and second inputs of the first comparator 4 are supplied with voltage from the output of the sensor 3 and the power supply 2, respectively. At the output of the first comparator 4, voltage U 4 is generated - shown in Fig.2c), in accordance with the condition
at U 2 ≥ U 3 U 4 = + U max
when U 2 <U 3 U 4 = 0, (3)
where - U max - saturation voltage at the output of the first comparator 4.
The phase of the voltage U 4 (see Fig. 2B) changes relative to the phase of the supply voltage U 2 when the value of the output voltage U 3 changes.
The voltage from the output of the power supply 2 is supplied to the input of the second comparator 6, the output of which is formed by the voltage U 6 - shown in FIG. 2d), in accordance with the condition
at U 2 ≤ 0 U 6 = + U max ;
for U 2 > 0 U 6 = 0, (4)
Voltages U 4 and U 6 are supplied to the first and second inputs of circuit AND 7, the output of which voltage U 7 is formed - shown in Fig.2d), which is described by the expression
U 7 = U 4 • U 6 . (5)
The duration of a single voltage pulse U 7 (see Fig.2d) varies as a function of the magnitude of the voltage amplitude U 3 .
The output of circuit And 7 is connected to the resolution input of the time interval meter 5. The time interval meter 5 in the general case can be a binary counter, which, when a single pulse is allowed at the input, counts the number of pulses arriving at its counter input. At the outputs of the time interval meter 5, a binary digital code is generated proportional to the duration of a single pulse at the resolution input and, therefore, proportional to the value of the parameter controlled by the sensor 3. According to the diagram in FIG. 2e) a single pulse is formed with a frequency of the supply voltage U 2 . The binary digital code at the outputs of the time interval meter 5 should be reset before each new arrival at the resolving input of a single pulse. Resetting the output binary digital code can be done by any known method and is not a distinctive characteristic of the proposed parameter-to-converter converter code (in the same way as in the prototype), therefore, the proposed device does not consider resetting. In accordance with fig.2d) a single pulse at the output of the circuit And 7 is formed at time t 2 . If we take the indicated point for zero, then the duration of a single pulse (t 3 - t 2 ) can be found from the solution of the equation
U 2 = U 3 . (6)
Using (1) and (2), we can write
K 2 • U a • sinωt = K 3 • f (x) • U a • sin (ωt + b), (7)
where K 2 and K 3 are the division coefficients of the input voltages at the second and first inputs of the first comparator 4, respectively.
Using [7], equation (7) can be transformed
Figure 00000002

From (8), the duration of a single pulse T = (t 3 - t 2 ) is determined by the relation
Figure 00000003

The number of periods of the frequency of the pulse generator 1, which determines the binary digital output code, is determined by the ratio
Figure 00000004

where f 1 is the frequency of the pulse generator 1;
f 2 - frequency of the alternating voltage at the output of the power supply.
The frequency f 2 of the alternating voltage at the output of the power supply 2 is formed based on the frequency f 1 . The frequencies f 1 and f 2 are related by
f 2 = f 1 / n, (11)
where n is the division ratio of the counter of the power supply 2.
Substituting (11) into (10), we obtain
Figure 00000005

Let us analyze the resulting expression (12).
The aim of the present invention is to simplify. Achieving the obtained goal is determined by the possibility of simplicity of the technical implementation of all arguments included in expression (12):
1) the argument n - the division ratio of the counter of the power supply 2 is present both in the prototype and in the present invention, it is technically simple to implement and does not depend on anything (temperature, time, etc.);
2) argument b is the phase shift between the supply and output voltage of the sensor 3, does not require technical implementation and is an integral characteristic of the sensor 3, is very dependent on temperature, time, pressure, etc., that is, it is quite stable;
3) the argument f (x) is the functional relationship between the measured parameter and the output voltage of the sensor 3, does not require technical implementation and is an integral characteristic of the sensor 3. The presence of the argument f (x) in the numerator and denominator of expression (12) certainly somewhat complicates the possibility of using binary the code from the output of the time interval meter 5. But this complication is insignificant, since it is associated only with a different software approach in computing equipment where the generated binary digitally will be used th code from the output of the time interval meter 5;
4) the argument K 2 / K 3 is the ratio of the coefficients of division of the input voltage at the second and first inputs of the first comparator 4, the technical implementation of the stable (temperature, time, pressure, etc.) fulfillment of this condition is very simple based on three to four high precision resistors.
 Thus, it can be concluded that the present invention provides a simplification of the parameter-to-code converter.
Sources of information
1. Zverev A.E., Maksimov V.P., Myasnikov V.A. Converters of angular displacements into a digital code. - L., Energy, 1974, pp. 85-87.
 2. Domrachev V.G., Matveevsky V.R., Smirnov Yu.S. Circuitry of digital voltage converters: Reference manual - M., Energoatomizdat, 1987, p. 75, Fig. 5.1.
 3. Zverev A.E., Maksimov V.P., Myasnikov V.A. Converters of angular displacements into a digital code. - L., Energy, 1974, p. 95.
 4. High-precision angular displacement transducers E.N. Asinovsky, A. A. Akhmetzhanov, M. A. Gabidulin, etc. Under the general. ed. A.A. Akhmetzhanova. - M .: Energoatomizdat, 1986, p. 114, 115, Fig. 95.
 5. High precision angular displacement transducers. E.N. Asinovsky, A. A. Akhmetzhanov, M. A. Gabidulin, etc. Under the general. ed. A.A. Akhmetzhanova - M .: Energoatomizdat, 1986, p. 7.
 6. Devices and elements of automatic regulation and control systems. Technical cybernetics. Book 1. Measuring devices, converting elements and devices. Under. ed. V.V. Solodovnikova. - M., Mechanical Engineering, 1973, pp. 590-594.
 7. G. B. Dwight. Tables of integrals and other mathematical formulas. - M., 1978, p. 70.

Claims (1)

  1.  Parameter converter - a code containing a serially connected pulse generator, a power supply unit that generates an alternating sinusoidal voltage at its output, a sensor with an amplitude of the output voltage of a sinusoidal shape changing as a function of the measured parameter, and a first comparator, the output of the pulse generator is also connected to the counting input of the time interval meter, at the output of which an output digital code is generated, characterized in that a second comparator and circuit I are additionally introduced, the output of the pit block Ia is coupled to a second input of the first comparator and the input of the second comparator, the outputs of the first and second comparators are connected to first and second inputs of the AND circuit whose output is connected to the input resolution slots meter.
RU2000101958A 2000-01-24 2000-01-24 Parameter-to-code converter RU2193794C2 (en)

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Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
АСИНОВСКИЙ Э.Н. и др. Высокоточные преобразователи угловых перемещений. - М.: Энергоатомиздат, 1986, с. 114 и 115, рис. 95. *

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