Open-loop current sensor

In industrial automation and motor drive systems, open-loop current sensors are essential components for precise control and safety protection. They are widely used in VFDs and servo drives to monitor motor winding current in real time, providing feedback for accurate torque and speed control.
Thanks to their fast response and high cost-effectiveness, they are also a preferred choice in UPS systems and power supplies for rapid overcurrent detection and battery charge/discharge management, ensuring reliable operation of equipment and power systems.

Open-loop current sensors play a critical role in general switching power supplies and high-power special power systems. They are used to achieve constant-current output or precise current limiting, ensuring stable operation of electronic equipment.

In high-dynamic, high-surge applications such as arc welding machines, open-loop sensors leverage their wide dynamic range and anti-saturation capability to accurately capture transient current changes, enabling fast current regulation and feedback control. This is essential for maintaining welding quality and equipment safety.

In the New Energy Vehicle (NEV) sector, open-loop current sensors are a core component of the Battery Management System (BMS). They provide high-accuracy, electrically isolated measurement of large charge and discharge currents, enabling precise calculation of the battery’s State of Charge (SOC) and State of Health (SOH). This is essential for extending battery life and preventing overcharge or over-discharge.

Additionally, in On-Board Chargers (OBC) and high-voltage DC/DC converters, open-loop sensors deliver real-time current feedback to stabilize voltage output and improve overall energy efficiency.