Sanken Electric has patented auto-calibrating current sensor ICs that measure magnetic fields produced by a conductor. The sensors use an electromagnetic model to determine current and conductor position based on magnetic field measurements. This innovation allows for accurate calibration of current sensors at specific positions. GlobalData’s report on Sanken Electric gives a 360-degree view of the company including its patenting strategy. Buy the report here.

According to GlobalData’s company profile on Sanken Electric, Quantum dot devices was a key innovation area identified from patents. Sanken Electric's grant share as of January 2024 was 39%. Grant share is based on the ratio of number of grants to total number of patents.

Auto-calibrating current sensor for determining current and position

Source: United States Patent and Trademark Office (USPTO). Credit: Sanken Electric Co Ltd

The granted patent (Publication Number: US11885866B2) discloses an auto-calibrating current sensor designed for calibration at a specific mounted position relative to a conductor. The sensor includes multiple magnetic field sensing elements within an integrated circuit (IC) that produce independent magnetic field measurements based on the current in the conductor. A memory with computer-executable instructions contains an electromagnetic model of the IC and conductor, allowing a processor to calculate the current in the conductor and the position of the IC relative to the conductor. This calibration process ensures accurate measurement of the current flowing in the conductor.

Furthermore, the patent details various aspects of the current sensor, including the calculation of the position of the IC as the distance across an airgap from the conductor, the inclusion of the position and orientation of the magnetic field sensing elements in the model, and the use of a three-dimensional electromagnetic finite-element-method (FEM) model. The model also incorporates a lookup table with coupling factor values for different distances between the IC and the conductor, enabling precise calibration. Additionally, the sensor can utilize non-linear equations, such as polynomials, to express coupling factors and determine them through interpolation. The sensor's design includes different types of magnetic field sensing elements like Hall effect elements, magnetoresistance elements, and fluxgate elements, allowing for versatile applications in measuring current. The patent also mentions the possibility of using multiple ICs with magnetic field sensing elements to enhance the sensor's capabilities in measuring current accurately.

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