SU471589A1 - Voltage multiplying device - Google Patents

Description

The invention relates to analog computing and measurement technology, and to the compensation multipliers of the instantaneous values of two signals, and can be applied in the construction of measuring 1H | reob (instantaneous and average power distributors).

IMSPUT. Compensation multiplying devices containing an electromagnet, in the gap of the magnetic circuit of which two Hall sensors are placed, one of which (fundamentals “oh”) is connected at the output of the input amplifier with a sequential Negative current feedback, and the other (home) the source of the conventional-mode T0), the output of the main Hall Sensor is the output of the device, and the output of the compensation sensor is connected to one input of the differential amplifier, to the other input of which 1 is fed the second input voltage, and at the output of the differential amplifier; an electromagnet winding is turned on.

In the known devices with compensation for the non-linearity of the truncated | magnetizing current to the induction of the gap, the frequency range of the input signals is significantly limited due to the presence of an electromagnet winding with a given current (the value of the input current converted into magnetic induction) must provide a sufficiently large magnetic field strength in the gap, the value of which determines the value of the output o. d. Hall.

At the same time, an increase in the frequency of the input signals leads to an increase in the voltage drop across the winding, which causes an increase in the output power of the differential amplifier to a predetermined current (at a significant value of the active winding resistance, the output power of the amplifier increases in direct proportion to the frequency). To expand the frequency range, the proposed device contains a current-to-voltage converter and a differential amplifier, eg | Ichem (A current-to-voltage converter is connected in sequence with one of the electromagnet windings, and the output of a current-level Hall sensor is connected to the inputs of the differential amplifier, the output of which is connected to the second winding of the electromagnet.

Pa drawing shows a diagram of the proposed multiplying devices.

The device contains an autocompensator 1, containing an amplifier 2 m cut source feedback 3; Hall sensors source 5 (reference) of the reference current; current-to-voltage converter 7; main winding 8

electromagite; differential amplifier 9; additional wrapping 10; U and ix are input voltages and currents.

To eliminate the effect of inductive coupling between the main and auxiliary windings, they can be located orthogonally, or the additional winding is turned on at the output of a controlled current generator (for example, an amplifier with negative current feedback.

The scheme works as follows.

Both Hall sensors are in a magnetic field, the induction of which is equal to the sum of the inductions caused by the ampere turns of the main and additional windings of the electrons: the agnite.

The output voltage of the Hall sensor 4

f /.

e, c SHi / r ,, e (O (i + io) where / CMC (I) is the conversion coefficient

magnetic system; 5 „1 - sensitivity of the Hall sensor 4; Rh - resistance value; resistor-3;

IQ - TOIK in additional information 10, the value of which is proportional to the error of the Transformation.

With the gain (slope) of the differential amplifier 9, much more than one, you can write

H2 - Siia (i-x + o) (O ID -

where Kpr is the conversion factor of the converter TOCA to voltage 7;

n2 and 5n2 - 1out | bottom | d. and sensitivity of the compensation Hall sensor 5. Determining the sum of the currents in both windings

 1 - 1x + ID - -Q 7 / ivr

 (H io

and subtracting it into the expression for get

SHI

gi -

Sii2lo k

As follows from the expression for e "1, the components of the multiplication error, caused by one-sided variations of S ,, i and 8" from various fahtori, 1 are deducted. The nonlinearity of the magnetic system decreases in

number) times equal to the gain of the differential amplifier. Therefore, the proposed scheme for preserving all the advantages of compensation schemes allows to significantly expand the frequency range.

input signals are the rate of a given multiplication error, due to the use of additive correction, since the output of the amplifier includes a weak power winding through which current flows, proportional to the conversion error.

Subject invention

A device for multiplying voltages

containing an electromagnet with two windings,; in the gap of the core of which are placed the main and "omlensation Hall sensors, and then. The inputs of the main Hall sensor are connected to the output of the auto, M1 sensor, and

voltage, and the current inputs of the compensation sensor to the reference source, ka, characterized in that, in order to expand the frequency range, it contains a current-to-voltage converter and a differential amplifier, in addition to a current-to-voltage converter connected in series with one from the windings of electromagnet, and the output of the current converter to the april and the output of the compensation Hall sensor are connected to the inputs of a differential amplifier, the output of which is connected to the second winding of the electromagnet.

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