A Hall Current Sensor Circuit with Double Hall Element Structure

Abstract

The invention provides a Hall current sensor circuit with a double Hall element structure, comprising a constant current compensation circuit (1), a zero adjustment circuit (2), a Hall element module (3), and a differential amplifier circuit (4) in the circuit. ), an output protection circuit (5), a voltage regulator circuit (6), a power supply circuit (7) and a power supply circuit (8); the Hall element module (3) is composed of two identical Hall elements in series, and the Hall element module (3) is composed of two identical Hall elements connected in series. The driving current of the Hall element is the same, and the unequal potential is compensated; the constant current compensation circuit (1) provides a constant driving current for the Hall element, and performs constant current compensation on the Hall element. The invention adopts the differential output method of double Hall elements, effectively reduces the influence of the unequal potential temperature drift of the Hall elements on the output voltage of the Hall sensor, solves the disadvantage of large zero point drift of the traditional Hall current sensor, and simplifies the circuit , The output zero drift is small, the precision is high, and the linearity is high.

Description

technical field [0001] The invention relates to the field of open-loop Hall current sensing design, in particular to a circuit design using dual Hall elements for temperature drift compensation of unequal potentials. Background technique [0002] The zero-point output voltage of the Hall current sensor is significantly affected by temperature changes, and the unequal potential of the Hall element is one of its main influences. The unequal potential is the inherent error of the Hall element itself, which mainly comes from the process error in the production process and a series of temperature effects of the internal carriers. Unequal potential compensation is a commonly used way to reduce the output zero drift of Hall current sensors, mainly including digital circuit compensation and analog circuit compensation. In terms of analog circuit compensation, after consulting relevant literature, it was found that Xu C, Liu J G, Zhang Q, et al. Investigation of the thermal drift of...

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Problems solved by technology

In terms of analog circuit compensation, after consulting relevant literature, Xu C, Liu J G, Zhang Q, et al. Investigation of the thermal drift of open-loopHall Effect current sensor and its improvement[C] / / 2015 IEEE International Workshop on Applied Measurements for Power Systems.IEEE, 2015. Proposed the use of dual Hall integrated circuits to reduce zero drift, but it is aimed at Hall integrated circuits instead of Hall elements, which is quite different from the circuit proposed by the present invention

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