Hall closed-loop current sensors, a powerful tool for precise current measurement
Hall Closed-loop Current Sensor (Hall Closed-loop Current Sensor) is a type of sensor that utilizes the Hall effect principle to measure current. It achieves current measurement by converting current into a magnetic field, and achieves accurate current measurement through feedback control.
Principle of operation:
The Hall effect is the potential difference that occurs when carriers move in a magnetic field. Hall closed-loop current sensors utilize the Hall effect through two components, the current receptor and the current controller. The current receptor converts the current into a magnetic field and senses the change in the magnetic field through the Hall element, generating a potential difference. The current controller adjusts the output current to equal the input current through feedback control according to the change in the potential difference, thus realizing accurate current measurement.
Application Scenarios:
Power system: Hall closed-loop current sensors are widely used in power systems for measuring AC current and DC current, such as power meters, power load management, etc.
Electric vehicles: electric vehicle current measurement is very important for battery management and vehicle control, Hall closed-loop current sensors can achieve accurate current measurement, to ensure the safe operation of the battery and the stable control of the vehicle.
Industrial automation: In the process of industrial automation, it is necessary to measure and control the current of the motor, frequency converter, inverter and other equipment, Hall closed-loop current sensors can provide accurate current feedback to achieve closed-loop control.
Electronic equipment: In electronic equipment, Hall closed-loop current sensors can be used for power management, battery charge/discharge management, motor drive and other applications.
Advantageous features:
High-precision measurement: Hall closed-loop current sensors can realize high-precision current measurement through feedback control, and usually the accuracy can reach below 0.1%.
Wide measurement range: Hall closed-loop current sensors can measure a wide range of currents, usually covering a current range of tens of milliamperes to thousands of amperes.
No need for series connection: Compared with traditional resistive current sensors, Hall closed-loop current sensors do not need to be connected in series in the circuit, and will not introduce additional resistance and power consumption.
Strong anti-interference ability: Hall closed-loop current sensors feel the current through the magnetic field, not affected by resistance and inductance and other factors, has a strong anti-interference ability.
Fast response: Hall closed-loop current sensor feedback control can realize a fast response, suitable for applications with high requirements for current changes.
Compact size: Hall closed-loop current sensors usually have small dimensions for easy installation and wiring.
Summary:
Hall closed-loop current sensor converts current into magnetic field by utilizing Hall effect and realizes accurate current measurement through feedback control. It is widely used in electric power systems, electric vehicles, industrial automation and electronic equipment, etc. It is characterized by advantages such as high-precision measurement, wide measurement range, strong anti-interference ability, fast response and compact size. The key to achieve accurate current measurement is to select suitable Hall components, design suitable circuits, optimize the feedback control algorithm, and perform calibration and calibration.
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