High-precision direct current Hall digit sensing system and current measuring method

The invention discloses a high-precision direct current Hall digit sensing system and a current measuring method. The Hall digit sensing system comprises a zero-flux type Hall sensor circuit, a single chip microcomputer, an amplifying circuit, an analog signal output circuit and a driving circuit. The single chip microcomputer comprises a built-in temperature sensor, a first D/A interface, a second D/A interface and an eight-way A/D interface. The current measuring method comprises the steps of single chip microcomputer built-in device initialization, a system no-load zero setting process, matched two-element function establishing, detected current rough measuring and detected current fine measuring. According to the Hall sensing system, the problems that in the prior art, a high-precision direct current Hall digit sensing system has non-linear errors, environment magnetic field interference and residual magnetism errors, so that measuring accuracy is low, and linear errors are large are greatly solved, the single chip microcomputer with the A/D interface with low converting accuracy is used, so that cost is low, and through the two steps of rough measuring and fine measuring of the current measuring method based on the Hall sensing system, detected current value errors are greatly lowered.