Hall current sensor

KJT current sensors are designed for accurate AC and DC current measurement and signal output in power electronics, industrial control, and new energy applications. They convert measured current into standard electrical signals for monitoring, analysis, and control, offering fast response, high accuracy, wide measurement range, and strong anti-interference performance. With compact design, optional electrical isolation, and reliable operation in harsh environments, they are ideal for power monitoring, energy management, and equipment diagnostics.

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Energy Monitoring: Used in smart meters and industrial energy management systems to accurately measure power consumption.
Fault Diagnosis: Detects abnormal current fluctuations (overcurrent or undercurrent) to help identify equipment failures.
Equipment Condition Monitoring: Monitors operating current of motors, transformers, and power supplies to assess device health.
System Protection: Provides real-time current signals for protective control.
Short-Circuit Protection: Rapidly detects high short-circuit currents to enable fast power shutdown.
Feedback Control: Serves as a key feedback signal in motor drives and servo systems for precise torque and speed control, ensuring stable and efficient operation.

Current sensors are particularly suitable for outdoor and off-highway applications, such as frequency converters, servo drives, robotic control, and PLC systems.

New Energy: Solar inverters, wind power generation, electric vehicles (Battery Management System (BMS), motor controllers, charging piles).
Smart Grid: Smart electricity meters, relay protection devices, distribution automation.
Home Appliances and Consumer Electronics: Overcurrent protection for air conditioners, washing machines, and mobile phone chargers.
Rail Transit: Locomotive traction systems, auxiliary power supply systems.
Power Supply Systems and Industrial Control: Used in high-frequency switching power supplies, inverters, converters, etc., to implement current loop control, improve efficiency and provide fast overcurrent protection.
Renewable Energy Power Generation: In solar and wind power generation systems, current sensors are used to optimize energy conversion and ensure system safety.

Assist the development of electric vehicles

High-precision measurement of battery charge/discharge current enables accurate capacity estimation and reliable driving range.
Millisecond-level current feedback for electric drive systems ensures precise motor torque control and enhanced driving performance.
Real-time overcurrent/short-circuit detection safeguards battery pack high-voltage safety and prevents thermal runaway.

Key control and protection of wind power generation

Wind turbine current sensors monitor/control generator-converter current to maximize wind energy capture and efficient power conversion.
They ensure converter output meets grid requirements, protect key components via rapid fault current detection, and guarantee stable grid connection and long-term station reliability.

Application of current sensors in photovoltaic and wind power inverters

Current sensors detect DC-side current to achieve MPPT and maximize energy capture.
Real-time AC-side output current monitoring ensures precise grid synchronization and optimized waveform quality.
Millisecond-level feedback control guarantees efficient, reliable, and safe grid-connected power conversion.

Open-loop Hall Current Sensor

Low Cost: Simple structure with few components.
Compact & Lightweight: No compensation coil, saving space.
Low Power: Minimal self-consumption for Hall element and op-amp.
Versatile: Measures DC, AC, and pulsed currents.

Closed-loop Hall Current Sensor

High Accuracy: Up to 0.1%~0.5% due to "zero flux" operation.
Excellent Linearity: Superior linearity across the full range.
Ultra-Fast Response: Wide bandwidth (DC~1MHz+) for transients.
Stable Performance: Low temperature drift via closed-loop feedback.

Hall Voltage Sensor

High Input Impedance: Minimizes loading effect on the measured circuit.
Galvanic Isolation: Safe isolation between high-voltage and control sides.
Broadband Measurement: DC, AC, and complex waveform detection.
Precise & Fast: Benefits from closed-loop technology advantages.