The current sensor is a detection device, which can sense the information of the measured current, and can transform the sensed information into an electrical signal meeting certain standards or other required forms of information output according to certain rules, so as to meet the requirements of information transmission, processing, storage, display, recording and control. Current sensors, also known as magnetic sensors, can be used in household appliances, smart grids, electric vehicles, wind power generation and so on. Many magnetic sensors are used in our lives, such as computer hard disks, compasses, household appliances and so on.