SU139010A1 - Device for indicating 90 ° phase shift - Google Patents

Description

The present invention relates to devices for indicating a 90 ° phase shift between two sinusoidal voltages in which squares of measured voltages are used.

The proposed device differs from limestone in that two Hall sensors are used as quadrating elements, the current electrodes of which are connected in series with magnetic coils that create the magnetic field of the sensors.

Such an embodiment of the device expands the range of measured frequencies from infra-low to ultrasonic.

The drawing shows a diagram of the proposed device.

The device consists of the current circuit of the Hall sensors / and 2 with series-connected magnetic coils 3 and 4 to create a magnetic field of the frequency of the input signals Ui and U, the 90 ° shift between which is determined from the circuit under study.

For AC with a frequency of sh e. d. Hall U of sensor J will be determined:

where / Ci is a constant value, / oi is the amplitude of the current in the primary circuit. Accordingly, for sensor 2:

With the equality of the input signals in the quadrature, the identity of the magnetic coils and the Hall sensors, the total em. DS from adder 5 at the input of pointer 6 will be equal to

E and 4 Ul K, / 5 ,. .. t + sin o l

as / o, / oa / o; and / C, / Cr K; / Sa / o, t. P .. total e. d. Hall sensors are constant when there is a 90 ° shift between two equally amplitude electrical oscillations.

Ux / (. Cos. (U.t,

and /iCJorsin.oj.Z.

Subject invention

A device for indicating a 90 ° phase shift between two sinusoidal voltages due to the absence of a variable component at the output of the squares of measured voltages, characterized in that, in order to expand the range of measured frequencies, two Hall sensors whose current electrodes are connected in series with magnetic coils that create the magnetic field of the sensors.