Magnetic circuit device of large-range high-precision Hall current sensor

Abstract

The invention discloses a magnetic circuit device of a large-range high-precision Hall current sensor, which comprises a magnetic core (1), a coil (2), a Hall chip (3) and auxiliary magnetic cores (4). The magnetic core is formed by superposing a plurality of annular soft magnetic silicon steel sheet components which have rectangular cross sections, C-shaped appearance and openings in the circles;the openings of the magnetic core are called magnetic slits; the coil is a spiral coil which is formed by tightly winding an insulated wire along the outer wall of the magnetic core; the Hall chip isan electronic element which utilizes Hall effect to generate Hall electromotive force; the auxiliary magnetic cores are flaky soft magnetic silicon steel sheet components corresponding to the magnetic core in shape, and the thickness of the auxiliary magnetic cores is 1 / 10-1 / 5 of the thickness of the magnetic core; the Hall chip is positioned in the magnetic slits, and the two auxiliary magneticcores are respectively and correspondingly clamped at the front side and the rear side of the magnetic core around which the coil is wound, so that the Hall current sensor achieves the purpose of enlarging the measuring range on the premise of keeping the original size, energy consumption and measuring precision.

Description

Technical field [0001] The invention relates to a magnetic circuit device, in particular to a magnetic circuit device of a large-range high-precision Hall current sensor used to expand the range of a closed-loop Hall current sensor. Background technique [0002] Description, closed-loop Hall current sensor, also known as Hall current sensor, hereinafter referred to as sensor; [0003] The problem is raised: The current sensors used in electric vehicles are mostly 500A range specifications. With the development of electric vehicles in the direction of high power density, it is required to increase the detection current range under the premise of limited volume, and the sensor itself is required. The lower the energy consumption, the better; [0004] The existing technology is used in the magnetic circuit of the sensor of the electric vehicle, see figure 2 It is composed of a magnetic core, a coil and a Hall chip. To increase the range, the magnetic flux must be increased by increasin...

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Problems solved by technology

[0004] Magnetic circuits for prior art sensors for electric vehicles, see figure 2 , consists of a magnetic core, a coil and a Hall chip. If you want to increase the range, you must increase the magnetic flux by increasing the volume of the magnetic core. In order to obtain a stronger balanced magnetic field, you need to increase the number of turns of the coil. , increasing the excitation compensation current of the coil, thus increasing the volume and energy consumption of the magnetic circuit of the sensor itself; in addition, due to the nonlinear relationship between the measured current and the excitation compensation current of the coil, the permeability of the magnetic core Near saturation, the measurement accuracy of the sensor is greatly reduced; due to the limited size, the range of the sensor used for electric vehicles in the prior art is within 500A. If the range of 500A is to be exceeded, the volume of the sensor must be increased. At the same time, the sensor The energy consumption of itself will also increase thereupon, that is, in order to expand the range, the volume will exceed the limit, the energy consumption will increase, and the measurement accuracy will decrease; Under the premise of measurement accuracy, the problems and deficiencies that it is difficult to expand the measuring range

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