Anti-saturation large-current double-Hall-element current sensor

Abstract

The invention discloses an anti-saturation large-current double-Hall-element current sensor, which is suitable for occasions with requirements on detection of contactor current in a larger range and small size. A magnetic circuit part locally induces the magnetic induction intensity of detection signals with the same size and direction and induces the magnetic induction intensity of interference signals with the same size and opposite directions by utilizing double Hall elements which are mutually 180 degrees in position; external magnetic field interference is eliminated through superposition, and the purpose of detecting the current is achieved through the linear relation between the magnetic induction intensity of the Hall element and the voltage; the magnetic circuit part is provided with a magnetic shielding shell made of anti-saturation magnetic material cobalt alloy and used for shielding magnetic field interference of contactor permanent magnets and adjacent binding posts of the contactor. The sensor is structurally composed of a Hall conditioning circuit, a magnetic ring, a magnetic ring air gap framework and a magnetic shielding shell. According to the invention, a high-permeability material is used as a magnetic ring material, and the magnetic ring, high-performance nylon and eight 2mm air gaps form a magnetic circuit, so that the purpose of improving the detection current range is achieved.

Description

technical field [0001] The invention relates to an electromagnetic interference-proof Hall sensor, in particular to an anti-saturation high-current double Hall element current sensor. [0002] technical background [0003] The current detection device dominated by the Hall element is a current detection element developed by applying the principle of the Hall effect to isolate and detect the primary current. The magnetic ring concentrates the magnetic flux lines generated by the conductor current in the center of the air gap, located at the The Hall element here collects the magnetic field and generates a Hall voltage proportional to the primary magnetic field. By measuring the size of the Hall voltage, the isolated detection of the primary current can be realized. Hall current sensors have the characteristics of good linearity, strong anti-interference ability, fast response speed, and simple installation. According to the working principle, they can be divided into open-loo...

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Problems solved by technology

The closed-loop Hall sensor has relatively large bandwidth and fast response, but it is too large to be integrated into a small switching device.

[0004] The open-loop Hall sensor has the characteristics of simple process, low cost, and small size. However, the Hall sensor products used in contactors on the market cannot adapt to the shape and size of the switching device terminals. The achieved measurement range is also around 1000A, and compared to the parameters of the switching appliances used in this product, there is also the problem of too large a volume

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