There are significant differences in principle, structure, application and performance between magnetic modulation current sensor and traditional current sensor. In order to deeply understand these differences, we will discuss them from several key dimensions.
Difference in principle
Traditional current sensor: usually including Hall effect sensor, Rogowski coil, zero flux transformer, etc. They calculate the current by directly or indirectly measuring the magnetic field strength around the conductor. For example, the Hall effect sensor uses the characteristic that the voltage generated by the Hall element in the magnetic field is proportional to the current passing through the element to measure the current; Rogowski coil, based on Faraday's law of electromagnetic induction, calculates the current value by detecting the change rate of current passing through the coil.
Magnetic modulation current sensor: this type of sensor adopts a special modulation technology, that is, an AC signal of known frequency (usually called carrier wave) is introduced into the main measurement circuit, and the DC or AC current is calculated by measuring the phase difference or amplitude change of the carrier signal under the influence of the measured current. This technology can effectively improve the measurement accuracy and dynamic range, and reduce the impact of temperature and long-term drift.
Structural differences
Traditional current sensors have various structures, ranging from simple Hall elements to complex closed magnetic circuit designs. They may need to directly contact or close to the conductor under test, and sometimes even need open loop or closed loop magnetic circuit design to enhance the measurement effect.
Magnetic modulation current sensor usually includes a primary coil for loading modulation signal and a secondary coil for detecting signal change. This design makes EP20K200EFC484-2X The sensor can realize non-contact measurement, reduce the mutual interference between the measurement circuit and the main circuit, and also simplify the installation and maintenance process.
Differences in application fields
Traditional current sensors are widely used in power systems, motor control, battery management systems, electronic equipment protection and other fields, especially in those applications that are sensitive to cost and do not require extreme precision.
Because of its high accuracy, wide range, low power consumption and strong anti-interference ability, the magnetic modulation current sensor is more suitable for occasions with strict requirements for measurement accuracy, such as precision instruments, battery management system of electric vehicles, current monitoring of photovoltaic inverters, high-end industrial automation control system, etc.
Performance Difference
1. Accuracy and linearity: Because of the digital signal processing technology, the magnetic modulation current sensor can correct the nonlinear error through algorithms, usually providing higher measurement accuracy and better linearity.
2. Bandwidth and response time: The magnetic modulation technology allows a wider dynamic measurement range and a faster response time, which is suitable for real-time monitoring of rapidly changing current.
3. Isolation capability: non-contact measurement mode enhances the electrical isolation performance and improves the use safety.
4. Temperature stability: through software compensation and modulation technology, the magnetic modulation sensor can better resist the impact of environmental temperature changes.
The magnetic modulation current sensor and the traditional current sensor have their own advantages. The selection should be based on the specific application scenario, accuracy requirements, cost budget and other factors. With the continuous progress of technology, the application prospect of magnetic modulation current sensor in the field of high-precision measurement is increasingly broad.
