Dual-Hall element current sensor

Abstract

The invention discloses a dual-Hall element current sensor and belongs to a current sensing device. The dual-Hall element current sensor is capable of solving the problems that the magnetic leakage is high and the measurement accuracy is lower due to the fact that air gaps in an iron core of a traditional dual-Hall element current sensor are bigger, and meanwhile, reducing outside noise interference, magnetic field interference, electrostatic interference and the like, and is used for measuring alternating current or direct current. The dual-Hall element current sensor disclosed by the invention comprises an insulating shell, an open annular iron core and two Hall elements, wherein the open annular iron core is located in the annular cavity of the insulating shell; the two Hall elements are located in the same air gap of the open annular iron core and the same section which is vertical to a magnetic line of force; the insulating shell is provided with a wiring terminal; the two Hall elements are respectively and electrically connected with the wiring terminal; and a magnetic shielding ring is arranged between the insulating shell and the open annular iron core. According to the dual-Hall element current sensor disclosed by the invention, by the placement mode of the two Hall elements, the magnetic leakage of the open iron core is reduced, and the measurement accuracy is correspondingly improved. The interference of a peripheral electromagnetic field can be effectively shielded by the arranged magnetic shielding ring.

Description

technical field [0001] The invention belongs to a current sensing device, in particular to a dual Hall element current sensor, which utilizes the Hall effect and is used for measuring alternating current or direct current. Background technique [0002] Such as figure 1 As shown, the traditional Hall current sensor includes an insulating shell 1, a conductor 5 is placed in the measuring hole 1-2, the measured current flows through the conductor 5, the Hall element is electrically connected to the terminal, and the insulating shell 1 is provided with wiring terminals. Due to temperature changes, the output of the Hall element will drift, affecting its measurement accuracy and linearity. Therefore, the Hall current sensor needs complex temperature compensation and linearity correction. Although some compensation techniques have improved the stability and measurement accuracy of the sensor to a certain extent, the implementation methods are complicated, the cost is high, and t...

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a dual Hall element current sensor, which solves the problem of large air gap in the core of the existing dual Hall element current sensor, resulting in more magnetic flux leakage and low measurement accuracy, and at the same time reduces external noise, magnetic field and Interference such as static electricity

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