Integrated Hall Sensor and Current Sensing Device for Automotive Applications
A current detection device, Hall sensor technology, applied in the direction of measuring devices, measuring current/voltage, instruments, etc., can solve the problems of large volume, consumption of metal materials, unfavorable miniaturization of measuring devices, etc., and achieve the effect of improving sensitivity
Inactive Publication Date: 2015-12-16
SAIC MOTOR
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Problems solved by technology
However, at present, devices that gather magnetic fields (such as iron cores) are generally used to improve the sensitivity of Hall sensors. These devices need to consume metal materials and are large in size, which is not conducive to the miniaturization of measurement devices.
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[0056] The specific embodiments are described below to illustrate the present invention by referring to the figures. However, it should be understood that these specific embodiments are only exemplary, and have no limiting effect on the spirit and protection scope of the present invention.
[0057] In this specification, the word "coupling" should be understood as including the situation of direct transmission of energy or signals between two units, or the situation of indirect transmission of energy or signals via one or more third units, and the Signals include, but are not limited to, those in electrical, optical, and magnetic forms. In addition, terms such as "comprising" and "comprising" indicate that in addition to the units and steps that are directly and explicitly stated in the specification and claims, the technical solution of the present invention does not exclude any elements that are not directly or explicitly stated. The situation of other units and steps. Fur...
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The invention relates to current detection technology, in particular to structure-compact integrated hall sensors and a current detection device based on the integrated hall sensors. The integrated hall sensor includes a substrate, a ferromagnetic layer and a shell body, wherein two hall sensor elements and a processing circuit are formed on one surface of the substrate, the ferromagnetic layer is formed on the other surface of the substrate, and the substrate and the ferromagnetic layer are sealed inside the shell body. The ferromagnetic layer is divided into two parts, and profiles of one sides of the two parts are in a symmetrical outer convex curve shape, wherein the one sides of the two parts are arranged in an opposite mode. The two hall sensors are respectively arranged below the two parts and distributed in a symmetrical mode relative to the space between the two parts. The processing circuit is configured to operate according to the following mode: subtracting output signals of the two hall sensors and determining the size of the detected current according to the subtracted signals.
Description
technical field [0001] The invention relates to current measurement technology, in particular to a compact integrated Hall sensor and a current detection device based on the integrated Hall sensor. Background technique [0002] Current detection technology has been widely used in the automotive field. Currently the most common is to use Hall sensors to measure current. In a typical Hall current sensor, when the current flows through the main circuit, a magnetic field whose strength is proportional to the magnitude of the current will be generated, and the magnetic field will induce a voltage signal in the Hall element, and the signal will be amplified by the power amplifier and then output. The current in the main circuit can be determined by measuring the magnitude of the signal. [0003] figure 1 The principle of current detection using a Hall element is shown. Such as figure 1 As shown, the Hall element is a kind of semiconductor sheet. When the current Ic is passed ...
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IPC IPC(8): G01R19/00
Inventor 杨凯邓恒张崇生郝飞
Owner SAIC MOTOR