SU1337794A1 - Method and device for converting product of two voltages into frequency pulse sequence - Google Patents

Abstract

 The method of converting the production of two voltages to the pulse frequency is implemented in a device containing integrator 1, source: IR (I) 2, 10 input voltage (H), AND 4 reference H, hye-bolic K: -ai converter 5, elements 6, 9 of the comparison, memory blocks 7, 8, resistive divider 11. Integrate the first H to a given level, balance its integral value with pulses of the reference H with a duration inversely proportional to the average value of the second H, and form the output pulse in during each cycle of balancing . The integral value of H is fixed at the initial moment of formation of the balancing impulse, the integral value of H is inverted and fixed at the moment of the end of the balancing impulse. The average value of two fixed Nivs is determined by the moment when the integral value H reaches the average value and the next balancing impulse of the reference H is formed. At the same time, each output impulse is formed after the balancing impulse ends at the moment the integral value H reaches the zero level. The invention of noBbmiaer conversion accuracy. 2 sec. f-ly, 2 ill. with (O (L with GO CO 4

Description

The invention is related to electrical measuring technology and can be used in electrical energy metering and control systems.

The purpose of the invention is to improve the accuracy of converting the product of two voltages to the pulse frequency by reducing the dynamic error,

FIG. 1 shows voltage diagrams illustrating a method for converting the production of two voltages into a pulse frequency}

in fig. 2 is a diagram of the device, the real value of the voltage applied to this method.

I The device contains integrator 1, first input voltage source 2, key 3, reference voltage source 4, hyperbolic transducer 5, first comparison element 6, first and second memory blocks 7 and 8, second comparison element 9, second input source 10 for example 20

The end point of the balancing pulse (and the integral value of the converted integral is represented in Fig. 1b by a dashed line, and the fixed value of the maximum of this voltage is shown in Fig. 15). Next, the average value of these two fixed voltages is determined (the phi 1p represents the average value of

NIN and resistive divider 11 for example - .ij of two voltages shown in FIG.

wives The input of the integrator 1 is connected to the output of the first source 2 of the input voltage and through the switch 3 to the output of the source 4 of the reference voltage. The first input of the hyperbolic converter 5 is connected to the second input source 10, the first output is to the control input of the key 3, and the second input is to the output of the first comparison element 6, the first input, which is connected to the output of the integrator 1. Analog inputs of the first and second blocks 7 and 8 of the memory are connected respectively to the non-inverted and inverted outputs of the integrator 1, the pulse inputs to the output of the first comparison element 6 and the second code of the hyperbolic converter 5, and the outputs to the extreme points of the resistive The first voltage divider 1 1, the midpoint of which is connected to the second input of the first comparison element 6. The first input of the second comparison element 9 is connected to the output of the integrator 1, the second

thirty

35

40

1 g and 1). At the moment when the integral value of the voltage reaches the specified average value (point 12 in Fig. 1 b), the next equilibrium impulse of the reference voltage is formed. In this case, each output pulse (Fig. 1i) is formed at the moment when the integral value of the voltage (Fig. 1 c) reaches the zero level. As a result, the values of the second factor (Fig. 1 - the shaded parts of the diagram) fall in the middle of the averaging period of the first voltage (Fig. Id).

The device that implements the method works as follows.

The voltage from the first input voltage source 2 is fed to the input of the integrator 1, as the voltage increases, the voltage at the integrator output reaches the threshold value of the first comparison element 6 (the first voltage integration operation to a predetermined level). After

the input is to the common bus and the output is 50 its triggering signal

with the output of the device.

The method is carried out as follows.

The first voltage is integrated up to 55 switches to its analog input of a given level (the change pattern over a time interval (pulse) with a duration inversely proportional to

The first input voltage is shown in FIG. 1a, the integral value of the voltage is in FIG. 1 c). Then

The second voltage. This impulse from the first output of the hyperbolic disproportionates the integral value of the first voltage with pulses of the reference voltage with a duration inversely proportional to the average value of the second voltage, and forms the next output impulse during each equilibration cycle.

Next, the integral value of the voltage is fixed (Fig. 1c) at the initial moment of the formation of the balancing impulse (i.e., the maximum value of the voltage of Fig. 1 is remembered), the integral value of the voltage is inverted and fixed.

The end point of the balancing pulse (and the 1-fold integral value of the voltage is shown in Fig. 1b with a dashed line, and the fixed value of the maximum of this voltage is shown in Fig. 15). Next, the mean value of the two mentioned fixed voltages is determined (in Fig. 1p, the mean value of

1 g and 1). When the integral value of the voltage reaches the specified average value (point 12 in Fig. 1 b), the next equilibrium impulse of the reference voltage is formed. In this case, each output pulse (Fig. 1i) is formed at the moment when the integral value of the voltage (Fig. 1 c) reaches the zero level. As a result, the values of the second factor (Fig. 1 - the shaded parts of the diagram) fall in the middle of the averaging period of the first voltage (Fig. Id).

The device that implements the method works as follows.

The voltage from the first input voltage source 2 is fed to the input of the integrator 1, as the voltage increases at the output of the integrator reaches the threshold value of the first comparison element 6 (the operation of integrating the first voltage to a predetermined level). After

arrives at the pulse course of the hyperbolic converter 11, which converts the voltage of the second source 10 of the input voltage, the input voltage. This impulse from the first output of the hyperbolic transducer 3 is fed to the control unit, key 3, with which the source of the reference voltage is connected to the second input of the integrator 1. As a result, the voltage is released at the output of the integrator 1. Thus, the balancing operation of the integral The value of the first voltage by the pulses of an etalo P1} st voltage is inversely proportional to the average value of the second voltage.

At the moment the first comparing element 6 is generated, a short pulse is outputted at the output of the last, arriving at the imp, the input of the first memory block 7, resulting in a lasting voltage equal to the maximum value at the output of the integrator 1. Thus, the operation of fixing the integral value of EP1 is carried out at the initial moment of the formation of the balancing impulse.

From the second output of the hyperbolic transducer 5, a short pulse is formed in the moment of squandering the reset impulse. The pulse from the second output goes to the pulse input of the second memory block 8, to the analog input of which the inverted voltage of the integrator 1 is applied. As a result, at the output of the second memory unit 8, the maximum value of the inverted output voltage of the integrator is fixed. At the midpoint of the resistive divider 11 is the voltage of the integrator. 1a, at the midpoint of the resistive voltage divider 11, the average voltage of the two memory blocks 7 and 8 is obtained. Thus, the operation of determining the average value of two fixed folders is carried out.

This voltage is applied to the second input of the first reference element 6. When the voltage at the output of the integrator 1 supplied to the first input of the first comparison element 6 reaches the indicated level, the signal from its output triggers the hyperbolic converter 5 and the next voltage reset occurs at the output of the integrator 1. The second comparison element 9 generates an output signal at ism (The voltage sign at the output of 1P1 integrator 1 with a negative

0

five

0

five

0

five

0

five

to positive. In this way, the final operation is performed — the formation of each output pulse after the termination of 1P1 balancing impulse at the moment of reaching the integral, 1m value of the voltage zero-Boi o level.

Formula and 3 about b r t e n i

1. The method of converting the production of two voltages to the frequency c; ie, pulse implantation, according to which the first voltage is integrated to a predetermined level, balances the integral value of the first voltage impulse. The reference voltage itself is long; 1) Noah mean second value of the same} P1 and form the next output impulse during each equilibration cycle, o tl and 1 a y i and so that, in order to improve the accuracy, the integral value of the first coi o marriages at the beginning of the moment equilibrating impulse, inverting and fixing the integral value of this threshold at the moment of termination of the counterbalancing impulse, determine the average value of the two mentioned fixed voltages, and at the moment when the integral value of the voltage reaches the specified average value form the next counterbalancing impulse of the reference voltage, with the output pulse is formed after the end of the balancing pulse at the moment when the integral value of the voltage reaches zero level n.

2. A device for converting a product of two voltages into a pulse frequency containing an integrator connected by its input to the output of the first input voltage source and through a switch to the output of the reference voltage source connected by a first input to the second source of input voltage e 1i, the first output - to the control input of the key, and the second input - to the output of the first comparison element, connected by its first input to the output of the integrator, characterized in that tim accuracy it further comprises first and second memory blocks, the second element

comparison and resistive voltage divider, with the first analog input of each of the memory blocks connected respectively to the non-inverted and inverted outputs of the integrator, the pulse inputs to the output of the first comparison element and the second output of the hyperbolic converter, and the outputs to the extreme

points of the resistive voltage divider connected by its midpoint to the second input of the first comparison element, the output of the second comparison element connected by its first input to the integrator output and the second input to the common bus as the output of the device.

Claims (2)

Claim 1 . A method of converting the product of two voltages into a pulse repetition rate, according to which the first voltage is integrated to a predetermined level, the integral value of the first voltage is balanced with the reference voltage pulses of duration inversely proportional to the average value of the second voltage, and the next output pulse is generated during each balancing cycle, about t l and the fact that, in order to increase accuracy, the integral value of the first voltage is fixed at the initial moment of formation balancing pulse, invert and fix the integral value of this voltage at the end of the balancing pulse, determine the average value of the two fixed voltages mentioned and when the voltage reaches the specified average value, the next balancing pulse of the reference voltage is generated, and each output pulse is generated after the balancing pulse at the moment when the integral value reaches zero voltage. it turns out the average voltage of the two blocks 7 and 8 of the memory. Thus, the operation of determining the average value of two fixed voltages is carried out. This voltage is supplied to the second input of the first element 6 comparison. When the voltage at the output of the integrator 1, supplied to the first input of the first comparison element 6, reaches the specified level, the signal from its output starts the hyperbolic converter 5 and the next voltage drop occurs at the output of the integrator I. The second comparison element 9 generates an output signal when the voltage sign changes to integrator 1 output with negative 2. A device for converting the product of two voltages into a pulse repetition rate, comprising an integrator connected by its input to the output of the first input voltage source and through a key to the output of the reference voltage source, a hyperbolic converter connected by the first input to the second input voltage source, and the first output to the control input of the key, and the second input to the output of the first comparison element connected by its first input to the output of the integrator, characterized in that, in order to increase For accuracy, it additionally contains the first and second memory blocks, the second element 1 33 7794 comparisons and a resistive voltage divider, the first analog input of each of the memory blocks connected respectively to the non-inverted and inverted outputs of the integrator, pulse inputs to the output of the first comparison element and the second output of the hyperbolic converter, and the outputs to the extreme points of the resistive voltage divider, connected by its midpoint to the second input of the first comparison element, while the output of the second comparison element is used as the device’s output ³ , it is connected by its first input to the output of the integrator, and the second input to the common bus.