SU300108A1 - Hall voltage sensor - Google Patents

Description

The invention relates to magnetic measurements and is intended to automatically compensate for the voltage from the non-equipotentiality of the emf sensors. Hall.

Known sensor e. d. A hall in which the voltage correction for non-equipotentiality is achieved by periodically switching the current and hall electrodes using a two-socket automatic switch. However, in the well-known emf sensor. Hall errors occur due to switching surges and time of flight of the moving contacts of the relay, which leads to a decrease in accuracy, sensitivity and speed of devices with Hall sensors.

The proposed sensor differs in that it is provided with an additional power source with a frequency different from the frequency of the main source in an even number of times connected to another pair of Hall element electrodes and two phase-sensitive rectifiers whose outputs are connected to a subtractor and the inputs to electrodes of the Hall element, the input of the first and the reference input of the second phase-sensitive rectifiers are connected to one pair of electrodes, and the input of the second and the reference input of the first to another pair of electrodes. In addition, the sensor is equipped with two selective amplifiers connected between phase-sensitive rectifiers and the corresponding pairs of electrodes.

The drawing shows the proposed scheme

sensor.

It contains a Hall element 1 with electrodes 2-5, a source 6 of alternating current frequency co, a source 7 of alternating current frequency 2rt (o, phase-sensitive rectifiers (FCV)

8 and 9, the subtractor 10 and the indicator device 11.

The scheme works as follows. The electrodes 2 and 3 of the Hall element 1 are connected to a current source of frequency co, and the electrodes 4 and

5 - with a current source of frequency 2heso. The voltage taken from the electrodes 2 and 3 is fed to the input of the FWC 8, the voltage of the current source 6 being used as the reference voltage. Voltage taken from

electrodes 4 and 5 are fed to the input of the FWC 9, the voltage of the current source 7 being used as the reference voltage of which. Due to the fact that e. d. Hall is not subject to the principle of reversibility, and the voltage

due to non-equipotentiality, this principle is applied; the constant component of the voltage at the input of the FWC 8 is proportional to the sum of the emf. Hall and voltage from non-equipotentiality, and at output FW 9 -

The output voltage of the subtractor is determined by the expression

and KE ,,

where K is the transfer coefficient of the subtractor;

EXT amplitude. value. d. Hall.

The indicator device 11 registers a voltage proportional to e. d. Hall and not dependent on the voltage of non-equipotentiality.

A selective amplifier can be included to separate the signals from the two power supplies between the phase-sensitive rectifiers and the corresponding -pairs of the Hall element electrodes. .

Subject invention

Claims (2)

1. Sensor e. d. Hall containing the Hall element, power supply connected to one of the electrode pairs of the Hall element, and an indicator device, characterized in that, in order to increase the speed and accuracy of voltage correction from potential inequality, it is equipped with an additional AC power source with frequently. that, oo. l ich and y. common frequency source even number of times connected to . another pair of Hall element electrodes, and two phase-sensitive rectifiers, the outputs of which are connected to the subtractive device, and the inputs to the Hall element electrodes, the first input and the reference input of the second phase-sensitive rectifiers connected to one pair of electrodes, and the second input and the reference input of the first electrode to another pair. 2. Sensor ed with. A hall according to claim 1, characterized in that, in order to separate signals from two power sources, it is equipped with two selective amplifiers connected between phase-sensitive rectifiers and corresponding pairs of electrodes.