Current sensing device

A current sensing and current sensor technology, which is applied in the direction of measuring devices, measuring current/voltage, measuring electrical variables, etc., can solve the problems of reduced measurement accuracy, low sensitivity of Hall effect, weak current detection, etc., and achieve high measurement sensitivity, Effects of preventing hysteresis and improving performance and stability

Inactive Publication Date: 2013-05-29
SAE MAGNETICS (HK) LTD
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Problems solved by technology

However, the above-mentioned current sensor 100 can only detect relatively large currents due to the low sensitivity of the Hall effect.
Therefore, for example, a weak current of 0.1mA-100mA cannot be detected by the current sensor 100
Moreover, since the conventional current sensing device with the current sensor 100 does not have any magnetic field shield to prevent the external magnetic field, the external magnetic field will also be induced by the Hall effect generator 106 of the current sensor 100, which will cause the Hall effect The output signal of the generator 106 is unstable; moreover, due to the influence of the external magnetic field, the measurement accuracy is also reduced
Therefore, current current sensing devices cannot meet the needs of sensing weak currents

Method used

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Embodiment Construction

[0044] Several different preferred embodiments of the present invention will now be described with reference to the accompanying drawings, wherein like reference numerals in different drawings represent like parts. As mentioned above, the essence of the present invention lies in a current sensing device, which has a magnetic field shielding component that shields the magnetic field collecting ring, thereby eliminating the influence of the external magnetic field, thereby improving measurement accuracy. Moreover, the current sensing device of the present invention has at least one calibration unit for calibrating the current sensor unit, which can prevent hysteresis of the magnetoresistive element of the current sensor unit, thereby improving the performance and stability of the current sensing device.

[0045] Figure 2 to Figure 4 A preferred embodiment of the current sensing device of the present invention is shown. Such as figure 2 As shown, the current sensing device 20...

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Abstract

The invention discloses a current sensing device. The current sensing device comprises a magnet field collecting ring, a current sensor unit and at least one current sensing device comprises a magnet field shielding assembly. The magnet field collecting ring is used for collecting a magnet field produced by a current-carrying wire penetrating through the magnet field collecting ring and is provided with a gap. The current sensor unit is formed in the gap and used for sensing the magnet field collected by the magnet field collecting ring. The magnet field shielding assembly is used for shielding the magnet field collecting ring and forming a gap together with the magnet field collecting ring and accordingly preventing an external magnet field from being collected by the magnet field collecting ring. The current sensing device can detect and measure weak current in high-accuracy mode and eliminate the influence of the external magnet field to measurement.

Description

technical field [0001] The invention relates to a current sensing device, in particular to a current sensing device capable of sensing weak current with high accuracy. Background technique [0002] Currently, current sensors are widely used in the electronics industry. Generally, such a sensor includes a Hall effect (Hall effect) generator for sensing a magnetic field generated by a current, thereby generating a Hall effect output voltage proportional to the magnetic field. [0003] Hall-effect generators usually consist of the same semiconductor material as a Hall plate formed on an insulating substrate, as is common. An excitation current is applied to the Hall chip, and when the Hall effect generator is placed in a magnetic field and the excitation current is applied to it, the output voltage can be measured. [0004] Various sensing devices utilizing the Hall effect phenomenon have been used in the past, such as figure 1 As shown, a conventional current sensor 100 inc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
Inventor 姚明高山野井康友
Owner SAE MAGNETICS (HK) LTD
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