Hall sensor is a kind of magnetic field sensor based on Hall effect. It is mainly used for force measurement. It has many characteristics such as high precision and good linearity. Now it has poles in industrial automation technology, detection technology, information processing, etc. Wide range of applications. Next Xiaobian introduced Hall sensor principle and Hall sensor characteristics. Hall sensor principle The Hall voltage changes with the magnetic field strength. The stronger the magnetic field, the higher the voltage, the weaker the magnetic field, the lower the voltage, the Hall voltage is very small, usually only a few millivolts, but amplified by the amplifier in the integrated circuit. This voltage can be amplified enough to output a stronger signal. If Hall ICs are used for sensing, it is necessary to use mechanical methods to change the magnetic induction. The method shown in the figure below uses a rotating impeller as a switch to control the magnetic flux. When the impeller blades are in the air gap between the magnet and the Hall IC, the magnetic field deviates from the integrated chip and the Hall voltage disappears. In this way, the change of the output voltage of the Hall IC can represent a certain position of the impeller drive shaft. Using this working principle, the Hall IC chip can be used to act on the ignition timing sensor. Hall effect sensors are passive sensors that require an external power source to operate. This feature makes it possible to detect low operating speeds. Hall sensor features 1, Hall sensors can measure arbitrary waveforms of current and voltage, such as: DC, AC, pulse waveform, and even the measurement of transient peaks. The secondary current faithfully reflects the waveform of the primary current. The common transformer is not comparable to it, it is generally only suitable for measuring 50Hz sine wave. 2. The electrical insulation between the primary circuit and the secondary circuit is completely insulated. The insulation voltage is generally 2KV to 12KV, and the special requirement is up to 20KV to 50KV. 3, high precision: in the working temperature area accuracy is better than 1%, the accuracy is suitable for any waveform measurement. The common transformer is generally 3% to 5% accurate and suitable for 50Hz sinusoidal waveforms. 4, good linearity: better than 0.1% 5, dynamic performance is good: response time is less than 1μs tracking speed di/dt is higher than 50A/μs 6, Hall sensor module This excellent dynamic performance provides a key foundation for improving the performance of modern control systems. Compared with ordinary transformer's response time is 10-12ms, it can not meet the needs of the development of the work control system. 7. Work frequency bandwidth: The accuracy is 1% in the frequency range of 0-100kHz. Accuracy is 0.5% in the 0-5kHz frequency range. 8, measuring range: Hall sensor module for the system product, current measurement up to 50KA, voltage measurement up to 6400V. 9, strong overload: When the primary current overload, the module reaches saturation, can automatically protect, even if the overload current is 20 times the rated value, the module will not be damaged. 10. The module is small in size, light in weight and easy to install. It will not cause any loss in the system. 11. The "capacitance" between the primary and the secondary of the module is very weak. In many applications, the various effects of the common-mode voltage are usually negligible. When the high voltage changes of several kV/μs are reached, the module has its own Shielding function X-ray machine maintenance. 12. The module's high sensitivity makes it possible to distinguish weak signals on "high components", for example, to distinguish a few milliamperes of AC components from a few hundred amps of dc components. 13, high reliability: failure rate: λ = 0.43 ╳ 10-6 / hour 14. Strong resistance to external magnetic fields: The error caused by a magnetic field generated by a current twice the operating current (2Ip) at a distance of 5-10cm from the module is less than 0.5%, which is resistant to external magnetic fields for most applications. Interference is sufficient, but interference with very strong magnetic fields should take appropriate measures. Hall sensor classification The first type is to directly provide appropriate amplification of the Hall potential and then provide it to a detection instrument or control device. The so-called direct detection Hall current sensor. This kind of sensor has high withstand voltage level, low cost and stable performance. However, the accuracy is affected by temperature changes, and the dynamic response characteristics are not ideal. My company uses circuit compensation to successfully solve the above problems. The second type is the magnetic field balanced Hall sensor, which uses a single or double Hall element, and works in zero flux state, and has the following characteristics: 1 wide measurement range, can measure a variety of currents, such as DC, AC, Pulse current and so on. 2 good electrical isolation performance. 3 high measurement accuracy and good linearity. 4 against the external electromagnetic and temperature and other factors of strong interference. 5 The rate of current increase is large and the response speed is fast. 6 overload ability. 7 small size, light weight, simple and convenient installation. The current product mainly uses magnetic field balanced Hall sensors. Editor's summary: The Hall sensor principle and Hall sensor characteristics are introduced here, and we hope to help everyone. If you want to know more about yourself, you can follow the information on this site. Hall sensor principle LEDER LIGHTING CO.,LTD , https://www.lederlight.com
