Current sampling method based on Hall

Abstract

The present invention provides a Hall-based current sampling method. The Hall-based current sampling method includes the following steps: calibrating the ADC module of a single-chip microcomputer; The sensor collects the corresponding relationship curves between the current and the actual current in the first range and the second range; the switching point between the first range and the second range is determined through the first relationship curve and the second relationship curve. The Hall-based current sampling method provided by the present invention has high sampling precision, thereby improving the estimation precision of the battery SOC.

Description

【Technical field】 [0001] The invention relates to the technical field of current measurement, in particular to a Hall-based current sampling method. 【Background technique】 [0002] With the continuous development of electric vehicles, the indicators of batteries that provide power for electric vehicles have also become the focus of attention. Among them, the battery SOC (State of Charge, state of charge) is used to inform the user of the remaining power of the battery, which is of great significance for the user to better plan the driving mileage. [0003] At present, the ampere-hour integration method is widely used to calculate the SOC of the battery. This method collects the current by using the Hall current sensor, and then integrates the current with respect to time, and finally obtains the amount of charge. Therefore, the accuracy of current acquisition directly affects SOC prediction. the accuracy. [0004] At present, the Hall sensor is usually used to collect the ...

AI Technical Summary

Problems solved by technology

However, since the ADC module of the single-chip microcomputer usually has nonlinear errors, the output of the Hall sensor is not strictly linear, and the magnification of the operational amplifier circuit is not the theoretical value of the calculation, which leads to the acquisition signal output by the single-chip microcomputer. There is a large error between the real current of the circuit where the sensor is located, which affects the estimation accuracy of the battery SOC

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