Research progress in fluxgate current sensors for precise measurement

The current sensor based on the principle of fluxgate is characterized by high linearity, high accuracy and wide frequency band, widely used for precise measurement of AC and DC current. Derive the magnetomotive force balance equation and analyze the excitation current cancellation mechanism. According to the excitation method, the fluxgate current sensor was divided into two types: external excitation type and self excitation type. The research progress at home and abroad was elaborated, including application fields, structural principle, key technical indicators, and main innovation points. Clear principle structure is an advantage of external excitation type, but there are many modules that need to be checked one by one when faults occur. The self excitation type is characterized by the simple circuit and is not limited by the optimal excitation condition. In addition, simplifying the circuit can reduce the failure rate, power consumption, and component temperature drift. Explore the future development trends of fluxgate current sensors and the work to be further studied.