RU39407U1 - DEVICE FOR MEASURING PHASE SHIFT BETWEEN TWO SINUSOIDAL SIGNALS - Google Patents

Abstract

The invention relates to the field of information processing systems and measuring equipment and can be used to determine the phase shift between sinusoidal signals of the same frequency in AC circuits for diagnosing the health of electrical and electromechanical systems and devices. A device for measuring the phase shift between two sinusoidal signals in AC circuits is equipped with first and second sampling and storage devices, the inputs of which are connected to the input buses. The output of the first fetch-storage device is connected to the third fetch-storage device and to the first adder. The output of the second fetch-storage device is connected to the fourth fetch-storage device and to the second adder. The output of the third sample-storage device is connected to an inverter, the output of which is connected to the first adder. The output of the fourth sampling-storage device is connected to the second adder. The outputs of the first and second adders are connected to the first multiplier, which is connected through an integrator to the divider multiplier. The outputs of the clock are connected to the inputs of the first, second, third and fourth sampling-storage devices. The inputs of the second multiplier are connected to the input buses, and its output is connected to the second integrator, the output of which is connected to

divisor multiplier. Technical result: a device is created that allows you to measure the phase shift between sinusoidal signals of the same frequency in AC circuits that do not necessarily belong to the same circuit or even to one device.

Description

The invention relates to the field of information processing systems and measuring equipment, and can be used to determine the phase shift between sinusoidal signals of the same frequency in AC circuits for diagnosing the health of electrical and electromechanical systems and devices.

The objective of the utility model is to create a device that allows you to measure the value of the phase shift between sinusoidal signals of the same frequency in AC circuits, not necessarily belonging to the same circuit or even to one device.

The problem is achieved in that the device for measuring the phase shift between sinusoidal signals in AC circuits, according to the utility model, contains the first and second sampling and storage devices, the inputs of which are connected to the input buses. The output of the first fetch-storage device is connected to the input of the third fetch-storage device and to the input of the first adder, and the output of the second fetch-storage device is connected to the input of the fourth fetch-storage device and to the input of the second adder. In addition, the output of the third sample-storage device is connected to the input of the inverter, the output of which is connected to the input of the first

adder. The output of the fourth sampling-storage device is connected to the input of the second adder. The outputs of the first and second adders are connected to the inputs of the first multiplier, which is connected through an integrator to the divider multiplier. And the outputs of the clock are connected to the inputs of the first, second, third and fourth sampling-storage devices. The inputs of the second multiplier are connected to the input buses, and its output is to the input of the second integrator, the output of which is connected to the input of the divider multiplier.

The well-known Tallenge theorem on quasi-power between any two sinusoidal signals that do not necessarily exist at the same time in a circuit and are not necessarily connected by one zone of a circuit [P. Penfield et al. Energy theory of electric circuits / P. Penfield, R. Spence, S. Duinker . - M .: Energy, 1974. - 152 pp.] It is also known that reactive power can be determined according to the method of OA Mayevsky [Mayevsky OA Energy performance of valve converters. - M.: Energy, 1978. - 320 S.] in the expression

where F _CVC is the area of the current-voltage characteristic for the studied signals, found in this case by the formula for determining the area of the polygon given by the coordinates of the ends of the segments

[Bronstein I.N., Semendyaev K.A. Handbook of mathematics for engineers and students of technical colleges. - M .: Nauka, 1980. - 976 p.]

substituting formula (2) into formula (1) we obtain the formula for calculating the reactive quasi-power according to Mayevsky

Active (average for the period) quasi-power can be determined by the expression

The authors experimentally established that expression (3) is valid for calculating reactive quasi-power , a expression (4) - for calculating the active quasi-power then, according to the power triangle, we can find tgφ _ab , as

Therefore, the method of determining the phase shift has several advantages, in particular there is no need to filter the signals from the DC component and shift the signals in phase by a certain angle. The relative error in determining the phase shift is on average 0.24%.

The device (Fig. 1) includes a first fetch-storage device 1 (UVX 1), a second fetch-storage device 2 (UVX 2), a third fetch-storage device 3 (UVX 3), and a fourth fetch-storage device 4 ( UVX 4), inverter 5, first adder 6 (Adder 1), second adder 7 (Adder 2), first multiplier 8 (Multiplier 1), first integrator 9 (Integrator 1), multiplier-divider 10 (Multiplier-divider), clock generator 11 (TG), the second multiplier 12 (Multiplier 2), the second integrator 13 (Integrator 2).

The input buses of the device are connected to the inputs of the sampling-storage devices: the first 1 (UVX 1) and second 2 (UVX 2), and the outputs of which are to the inputs of the third 3 (UVX 3), fourth 4 (UVX 4) of the sampling-storage devices and to the inputs of the first 6 and second 7 adders. The input of the third sampling-storage device 3 (UVX 3) is connected to the input of the inverter 5, the output of which is connected to the input of the first adder 6. The output of the fourth sampling-storage device 4 (UVX 4) is connected to the input of the second adder 7. The outputs of the first 6 and second 7 adders

connected to the inputs of the first multiplier 8, the output of which is connected to the input of the first integrator 9. The output of the first integrator 9 is connected to the input of the multiplier divider 10. The outputs of the clock generator 11 are connected to the control inputs of the first 1, second 2, third 3, and fourth 4 sampling devices storage. The inputs of the second 12 multiplier are connected to the input buses, and its output is to the input of the second integrator 13. The output of the second integrator 13 is connected to the multiplier input of the multiplier divider 10.

The first 1, second 2, third 3 and fourth 4 sampling and storage devices can be implemented on chips 1100SK2. Inverter 5 can be implemented on a chip 140UD17A. The first 6 second 7, the adders can be implemented on operational amplifiers 140UD17A. As multipliers 8, 12 and multiplier divider 10 can be used chip 525PSZ. Integrators 9 and 13 can be implemented on an operational amplifier 140UD17A. The clock generator 11 can be implemented on an AT80C2051 microcontroller.

The device operates as follows. The signal proportional to the first sinusoidal signal a (tj) is input to the input of the first I / O 1, and the signal proportional to the second sinusoidal signal b (tj) is input to the second I / O 2. The current values a (tj) and b (tj) are written and stored in these blocks, which are rewritten into blocks 3, 4 at the next signal and become the previous values. On the

the output of adder 6 produces a signal equal to the difference between the current and previous values of the signal a (tj), and at output 7, the sum of the current and previous values of the signal b (tj). In block 8, these signals are multiplied and fed to an integrator 9, the output of which produces a signal proportional to reactive quasi-power , which is input to the multiplier divider 10. At the same time, the input signals are fed to the second multiplier 12, the output of which produces an instantaneous power signal , which is fed to the input of the second integrator 13. At the output of the second integrator 13, a signal is obtained equal to the active quasi-power , which is fed to the input of the multiplier divider 10. At the output of block 10, a value is obtained proportional to the phase between the input signals .

The utility model makes it possible to measure the value of the phase shift between two sinusoidal signals that do not necessarily belong to the same circuit or to one device.

Claims (1)

A device for measuring the phase shift between two sinusoidal signals in AC circuits, characterized in that it is equipped with first and second sampling and storage devices, the inputs of which are connected to the input buses, while the output of the first sampling-storage device is connected to the third sampling-storage device and with the first adder, and the output of the second fetch-storage device is connected to the fourth fetch-storage device and with the second adder, in addition, the output of the third fetch-storage device is connected to the inverter, exit for which it is connected to the first adder, and the output of the fourth sampling-storage device is connected to the second adder, the outputs of the first and second adders are connected to the first multiplier, which is connected through the integrator to the divider multiplier, and the clock outputs are connected to the inputs of the first, second, the third and fourth sampling-storage devices, while the inputs of the second multiplier are connected to the input buses, and its output is connected to the second integrator, the output of which is connected to the multiplier divider.