SU819733A1

SU819733A1 - Power meter

Info

Publication number: SU819733A1
Application number: SU792772313A
Authority: SU
Inventors: Григорий Викентьевич Логинов; Александр Васильевич Кузьмин
Original assignee: Ульяновский Политехнический Ин-Ститут
Priority date: 1979-05-30
Filing date: 1979-05-30
Publication date: 1981-04-07

Description

(54) ИЗМЕРИТЕЛЬ МОДНОСТИ(54) FASHION METER

Изобретение относитс к электроизмерительной технике.This invention relates to electrical measuring technology.

Известно устройство, содержащее нуль-орган, две логические схемы совпадени , два источника посто нного эталонного напр жени и дополнительный интегратор дл двухтактного интегрировани , причем вход основного интегратора подсоединен через ключ к первому источнику-.сигнала , выход интегратора через другой ключ подсоединен к нуль-органу, управл ющие входы обоих ключей соединены с выходом тактового генератора , выход нуль-органа через управл емый вход ключа соединен с входом интегратора, вход данного ключа соединен с двум источниками опорного напр жени через два других ключа, управл ющие входы которлх соединены с выходом логических схем; два первых входа логических схем подсоединены к генератору тактовых илшульсов , а два других входа соединены с входом нуль-органа и со источником сигнала через управл емы входы двух ключей, выходы которых соединены с- входом дополнитейьного интегратору; выход интегратора через блок сравнени подключенA device containing a null organ, two matching logic circuits, two sources of a constant reference voltage and an additional integrator for push-pull integration, the input of the main integrator is connected via a key to the first source signal, the output of the integrator is connected to a zero through another switch To the body, the control inputs of both keys are connected to the output of the clock generator, the output of the null body is connected to the integrator's input through a controlled key input, the input of this key is connected to two sources and the reference voltage through two other keys, the control inputs of the chassis are connected to the output of logic circuits; the first two inputs of logic circuits are connected to a clock and pulse generator, and the other two inputs are connected to the input of a null organ and to a signal source through the control inputs of two keys, the outputs of which are connected to the input of an additional integrator; integrator output through the comparison unit is connected

к одномуИЗ источников опорного напр жени , вход блока сравнени подключен к интегратору и через ключ к второму входу дополнительного интегратора .to one of the reference voltage sources, the input of the comparison unit is connected to the integrator and through a key to the second input of the additional integrator.

Это устройство малонадежно. Известен измеритель мощности, содержащий компаратор, первый вход которого соединен с выходом генератора пилообразного напр жени , и интегратор, вход которого соединен с шиной первого входного сигнала.This device is unreliable. A power meter is known that includes a comparator, the first input of which is connected to the output of the saw-tooth generator, and an integrator, whose input is connected to the bus of the first input signal.

Это устройство также малонадежно.This device is also unreliable.

Целью насто щего изобре1;ени вл етс повышение надежности.The purpose of the present invention is to increase reliability.

Claims

. The goal is achieved by the fact that the device containing the comparator, the first input of which is connected to the output of the saw-tooth generator, and the integrator, whose input is connected to the bus of the first input signal, has a one-shot and filter, and the second input of the comparator is connected to the second bus of the input signal The comparator output through a single vibrator is connected to the control inputs of the sawtooth generator and the integrator, the output of which is connected via a filter to the output signal bus. FIG. 1 shows a power meter diagram; in fig. 2 shows time diagrams of his work. The power meter contains a sawtooth generator 1, an integrator 2, a comparator 3, a filter and a one-shot 5, the first input of the comparator 3 is connected to the output of the generator 1, the second to the bus b of the first input signal, the output through the one-shot 5 is connected to the control inputs of the generator 1 and integrator 2, whose input is connected to the bus 7 of the second input signal, and the output through the filter 4 is connected to the bus 8 of the output signal. The power meter works as follows. The rectified signals (Fig. 2a, proportional to the current and voltage in the circuit under study, arrive at the power meter b and 7 tires). At the time when the voltages at the inputs of the comparator 3 are equal, the single vibrator 5 produces pulses (Fig. 2c) that zero the generator 1 integrator

2. After that, the voltage at the output of generator 1 begins to increase again, and the cycle repeats. The intervals between the zero impulses are determined by the following expression j. where U, jit) is the signal on bus b, and V is the voltage rise rate of the sawtooth generator, which is chosen based on the fact that during the voltage rise time of the sawtooth generator 1 voltage from zero to the maximum value changed. At the output of the integrator 2, a voltage Up is formed over time, which is defined by the following expression:, K., .. ". u,., U; ,,,,. where k is the coefficient of proportion. integration features; N - g; - proportionality factor of the power converter. Thus, the voltage amplitude and p is proportional to the power in the measured circuit. Voltage Up is fed to filter 4, the output voltage of which is proportional to the power and hygx of the circuit being measured. The increase in reliability in this device is achieved by the fact that it is simpler than the known, measuring the power with the same high accuracy. Claims of Invention A power meter comprising. a comparator, the first input of which is connected to the output of the sawtooth generator; and an integrator, the input of which is connected to the first input signal bus, characterized in that, in order to increase reliability, a one-shot and a filter are inserted in it, the second comparator input connected to the second bus input signal, the comparator output through the one-shot is connected to the control inputs of the saw-tooth generator and the integrator, the output of which is connected via a filter to the output signal bus.