Development of current sensor with 0.1% precision applicable to automotive electronic components

Abstract

This study is a smart current sensor that can protect and control the power system by predicting and analyzing power demand through accurate current measurement and detecting not only rated current but also accident current through accurate measurement of abnormal and fault current. In this study, a low-power current sensor with 0.1% precision was designed and manufactured using Planar Hall Resistance (PHR), a magnetic sensing device compatible with the CMOS process. The current sensor is largely composed of a current sensing unit, a current path, and a smart signal processing ROIC, and was manufactured and packaged in the form of an all-in-one ROIC to enable a post-CMOS compatible process on the CMOS ROIC. The current sensor has a driving range of 0 to 10A, has a sensor precision characteristic of 0.1%, and is applied to automotive flasher units as an application field.