High-Precision Closed-Loop Current Sensor for EV Power Systems

The FDC Magnetic Gate Current Sensor is a high-precision, isolated DC current measurement device specifically designed for use in new energy vehicles (NEVs), including electric cars, hybrid electric vehicles (HEVs), and plug-in hybrids (PHEVs). This sensor employs advanced magnetic gate technology to measure direct current flowing through the battery pack’s main busbar or power cable without physical contact, enabling accurate, safe, and reliable monitoring of charging and discharging currents. Installed directly on the battery pack’s busbar system, it provides critical data to the Battery Management System (BMS) for state-of-charge (SOC) estimation, thermal management, and fault detection—ensuring optimal performance, safety, and longevity of the battery system.

Utilizing a non-contact magnetic sensing principle, this sensor eliminates the need for shunt resistors or invasive current paths, reducing power loss, heat generation, and potential failure points. It supports multiple current ranges—±500A, ±700A, and ±1500A—to accommodate various vehicle platforms and battery capacities. The sensor delivers exceptional accuracy with linearity error less than 0.1%, and full temperature range deviation under 0.5%, ensuring consistent performance across extreme operating conditions from -40°C to +85°C. Its wide operating voltage range (+8V to +16V) ensures compatibility with standard automotive electrical systems, while built-in power protection mechanisms safeguard against reverse polarity, overvoltage, and short-circuit events.