Compensation circuit for sensitivity and zero temperature drift in Hall sensor integrated chip and compensation method thereof

Abstract

The invention discloses a compensation circuit for sensitivity and zero temperature drift in a Hall sensor integrated chip. The compensation circuit comprises an Hall sensing element, an amplifier, anadder, a buffer, a gain adjustment module, a zero adjustment module, a temperature sensor, a stress sensor, an ADC (analog-to-digital converter), a control processing circuit, a first DAC, a second DAC, a factory temperature compensation coefficient memory, a factory stress compensation coefficient memory, a user gain correction value memory and a user zero offset correction value memory. Correspondingly, the invention also provides a compensation method of the compensation circuit for sensitivity and zero temperature drift in the Hall sensor integrated chip. According to the compensation circuit and the compensation method, the sensitivity and zero-point temperature drift compensation precision is greatly improved, the performance index of the sensor is improved, and requirements of customers for sensitivity and zero-point temperature compensation in the production or use process of the sensor are met; and the method not only realizes temperature compensation of the sensitivity, butalso realizes compensation of zero-point temperature drift, and can quickly respond to change of an external magnetic field.

Description

technical field [0001] The invention relates to a Hall sensor integrated chip, in particular to a Hall sensor integrated chip including sensitivity and zero-point temperature drift compensation. Background technique [0002] The existing Hall sensor chip can be used to make a current sensor for current measurement. It is based on the Hall effect. The Hall chip induces the magnetic field generated by the current to output the Hall voltage signal. The size of the signal is proportional to the size of the magnetic field generated by the current. Proportion. The index parameters of the Hall chip will affect the performance of the current sensor based on the Hall effect, such as the sensitivity and output zero point of the Hall chip. Sensitivity is the ratio of the output signal of the Hall chip to the proportional change of the magnetic field, and the output zero point is the static voltage output of the Hall sensor chip under zero magnetic field. [0003] When the Hall sensor...

AI Technical Summary

Problems solved by technology

[0007] At present, most Hall sensor chips use analog compensation technology, such as piezoresistors, etc., which can adjust the sensitivity and output zero point offset with temperature, but often at the cost of sacrificing sensitivity and output zero point accuracy.

In addition, the analog compensation technology is fixed, not suitable for compensation and calibration of production or field changes

[0008] While Hall sensor chips with digital circuits tend to be slower than sensors with analog circuits, in other words, Hall sensor chips with digital circuits do not respond well to rapidly changing magnetic fields

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