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Autonomously calibrated magnetic field sensor

A magnetic field sensor, sensor technology, applied in the direction of magnetic field offset compensation, instruments, measuring magnetic variables, etc., can solve the problem of increasing the total cost of the implementation, reducing the reliability or accuracy of the sensor, and interconnecting the sensor sensor with external circuits and components complication etc.

Active Publication Date: 2013-06-05
莱姆电子(中国)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the generation of the modulated reference magnetic field relies on an external reference current source for the reference coil generating the reference magnetic field, which complicates the mounting of the sensor and its interconnection with external circuits and components, and increases the overall cost of the embodiment
Reliance on external reference current can also reduce sensor reliability or accuracy

Method used

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  • Autonomously calibrated magnetic field sensor
  • Autonomously calibrated magnetic field sensor
  • Autonomously calibrated magnetic field sensor

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Embodiment Construction

[0022] first reference figure 2 , illustrating the circuit principle of a magnetic field sensor 1 according to an embodiment of the invention is shown generally comprising a magnetic field sensing circuit 2 , an internal reference current generator 3 and a signal processing circuit 4 . The magnetic field sensing circuit 2 includes a magnetic field sensing unit 6 , a reference magnetic field generator 8 and a gain correction input terminal 10 . Based on the detection of the magnetic field generated by the current to be measured, the magnetic field sensor according to the invention can advantageously be used as a current sensor. The magnetic field sensor according to the invention can also be implemented in other magnetic field sensing applications.

[0023] The magnetic field sensing unit 6 may include one or more magnetic field sensing elements, for example, a Hall effect sensor as known in the art or a Hall effect sensor array formed in an integrated circuit, and the magnet...

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Abstract

The invention discloses an autonomously calibrated magnetic field sensor. The magnetic field sensor including a magnetic field sensing circuit (2) comprising a reference magnetic field generator (8) and a magnetic field sensing cell (6), and a signal processing circuit (4) connected to the output of the magnetic field sensing cell and comprising a demodulator circuit and a gain correction feedback circuit (30, 28, 47) for correcting error fluctuations in the transfer characteristic of the magnetic field sensor. The sensor further comprises a reference current generator (3)configured to generate a reference current I ref, the reference current generator connected to the magnetic field sensing circuit (2) configured for generating the reference magnetic field B ref and to the gain correction feedback circuit configured for providing a reference signal (y ref ) to which an output signal of the demodulator circuit may be compared.

Description

technical field [0001] The present invention relates to magnetic field sensors that are self-calibrating to compensate for fluctuations in transfer characteristics due to factors such as temperature, aging, mechanical stress and voltage bias. The invention also relates to a current sensor which measures the current flow in an outer conductor by means of a calibrated magnetic field sensor. Background technique [0002] Magnetic field sensors that are calibrated during manufacturing to compensate for voltage bias and temperature drift cannot adequately compensate for fluctuations in sensor transfer characteristics resulting from factors such as mechanical stress and component aging. To address this drawback, it is known to provide sensors that are calibrated in use as described in US 4752733 and WO2006 / 056829. [0003] WO2006 / 056829 discloses a magnetic field sensor comprising a reference magnetic field generator, a magnetic field sensing unit and a signal processing circuit ...

Claims

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Application Information

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IPC IPC(8): G01R33/00G01R33/07
CPCG01R35/005G01R33/07G01R33/0035G01R33/0029G01R33/0017
Inventor G·M·阿尼利M·帕斯特尔安德里亚·阿基比尔M·卡亚尔
Owner 莱姆电子(中国)有限公司
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