The AC voltage sensor is based on the Hall effect and closed-loop magnetic compensation principle to achieve accurate measurement of AC voltage. Its technical advantages and application characteristics are as follows:

1. The core mechanism of Hall effect

When the measured voltage is converted into current through an external or internal resistor, the current flows through the multi turn winding and generates a magnetic field in the magnetic material. At this point, the Hall element located in the air gap will induce an electromotive force (i.e. Hall voltage) due to the magnetic field. The essence of this phenomenon is that charge carriers are deflected under the Lorentz force, resulting in a potential difference between the two sides of the semiconductor material. Since the Hall voltage is proportional to the magnetic field strength, and the magnetic field is determined by the primary current, the measured voltage value can be indirectly calculated by detecting the Hall potential.

2. Dynamic balance implementation of closed-loop magnetic compensation for AC voltage sensors

The sensor adopts a zero flux closed-loop system: the compensation coil on the secondary side receives the feedback signal processed by the amplifier and generates a reverse magnetic field to cancel out the magnetic flux generated by the primary current in real time. This automatic adjustment mechanism ensures that the magnetic core is always in a near zero magnetic flux state, significantly improving measurement accuracy and response speed. Compared to open-loop design, closed-loop structure can effectively suppress problems such as temperature drift and nonlinear distortion, while enhancing the ability to resist electromagnetic interference.

3. Wide bandwidth characteristics compatible with AC and DC

Unlike traditional electromagnetic voltage transformers that can only process AC signals, this type of sensor can measure both DC components and accurately capture the amplitude, frequency changes, and complex harmonic components of AC waveforms. Although its multi turn winding design introduces a certain inductance, it can still maintain a wide frequency response range by optimizing the magnetic circuit structure and compensation algorithm, making it suitable for dynamic scenarios such as variable frequency speed regulation and servo drive.

4. High precision and stability guarantee

By incorporating temperature control measures and low drift semiconductor materials such as gallium arsenide or indium antimonide, performance fluctuations caused by temperature are effectively reduced. Combined with a precise linear differential amplifier circuit, measurement accuracy better than 0.5% F.S can be achieved, and nonlinear distortion can be controlled within 0.1%. The high insulation isolation design between the primary and secondary sides (with a withstand voltage of DC3KV/1min) ensures the safe operation of the equipment in high-voltage environments.

5. Industrial grade reliability and adaptability of AC voltage sensors

Adopting a flame-retardant shell that complies with UL94-V0 standards, it is suitable for long-term stable operation in harsh working environments. The compact PCB board installation form facilitates integration into power electronic equipment and is widely used in fields such as UPS power monitoring, new energy generation systems, and rail transit traction converters. Modular design also supports flexible configuration of different ranges, meeting diverse needs from millivolts to kilovolts.