Hall current sensors are widely used in various fields such as frequency converters, inverters, power supplies, welding machines, substations, electrolytic plating, CNC machine tools, microcomputer monitoring systems, power grid monitoring systems, and large currents and voltages that require isolation detection due to their high accuracy, good linearity, wide frequency band, fast response, strong overload capacity, and no insertion loss. But many friends may not be very familiar with the quality detection methods of Hall current sensors. So today, Weikewei will list some practical detection methods for everyone!

1、 Selection of Hall current sensor

When selecting a Hall current sensor, we can conduct a comprehensive test run on the components of the Hall current sensor to detect whether the components of the Hall current sensor are abnormal. The following provides relevant detection methods:

2、 Sensor power supply voltage detection

After disconnecting the ignition switch, you can unplug the sensor wire connector plug and connect the positive and negative probes of the multimeter to terminals 1 and 3 of the connector, respectively. When the ignition switch is turned on, the voltage should be above 4.5V.

If the voltage is zero at this time, it indicates that there is a broken or short circuit in the wiring harness, or there is a malfunction in the ECU; After disconnecting the ignition switch, it is necessary to continue checking for any open or short circuits in the wiring.

3、 Detection of wire resistance:

When using a multimeter to check the resistance of a sensor, the resistance values between terminal 1 and terminal 62 of the ECU, terminal 2 of the sensor and terminal 76 of the ECU, and terminal 3 of the sensor and terminal 67 of the ECU should not exceed 1.5 Ω.

If the resistance is too high or infinite, it indicates poor contact in the wiring harness or a broken wire. In this case, the wiring harness should be repaired or replaced.

Use a multimeter to continue checking the resistance between terminals 1, 2, and 3 of the sensor connector, and also check the resistance between terminals 62, 76, and 67 of the ECU. The measured resistance should be infinite.

4、 The detection principle of Hall current sensor

The output of Hall devices and magnetic circuits has a good linear relationship, so the voltage signal U0 output by Hall devices can indirectly reflect the magnitude of the measured current I1, that is, I1 ∝ B1 ∝ U0.

When we calibrate U0 as when the measured current I1 is at the rated value and U0 is equal to 50mV or 100mV, we create a Hall direct detection (without amplification) current sensor.

How to choose a Hall current sensor? After reading this article, I believe you will have a better understanding of this issue as well! For the selection of Hall current sensors, Weikewei will use some detection methods for their components in order to better understand the various operational performance of Hall current sensors!

Conclusion: Recommended product Hall sensor-《Open loop Hall current sensor-B27》

In recent years, new power semiconductor devices have entered a large number of fields such as power electronics, AC variable frequency speed regulation, inverter devices, and switching power supplies. Therefore, the significance of accurately measuring current signals has become increasingly important. Hall current sensors have many advantages such as high accuracy, good linearity, wide frequency band, fast response, strong overload capacity, and no loss of measured circuit energy. Therefore, they are widely used in variable frequency speed regulation devices, inverter devices, UPS power supplies, inverter welding machines, substations, electrolytic plating, digital control machine tools, microcomputer monitoring systems, power grid monitoring systems, and various fields that require isolation and detection of high currents and voltages. Accurate detection and control of high current is also the fundamental guarantee for the safe and reliable operation of power electronic products. The application principle of Acrel's Hall devices is relatively simple, the signal processing is convenient, and the devices themselves have a series of unique advantages, so their application combinations are diverse. As a fundamental device for magnetic field sensors and magneto electric conversion, with people's familiarity and understanding of it, they will play an increasingly important role in various information acquisition and processing, just like other basic devices such as sensors.