Current Sensor Magnetic Field Detection Error Reduction
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Solution Overview
Problem
Current sensors face measurement errors due to displacement of magnetic sensor elements relative to the conductor, and they are difficult to integrate into a single chip, hindering size reduction.
Innovation Solution
A current sensor design with a plate-shaped conductor and strategically placed magnetic sensor elements that detect magnetic fields generated by the current, where the distance between the sensor elements is minimized to reduce measurement errors and allow for integration onto a single substrate, thereby reducing size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between magnetic detection elements is made longer to detect magnetic fields from separated conductors, then the detection capability is improved, but the measurement error due to chip displacement increases
Solution Approach 1:
The patent combines multiple magnetic detection elements (first and second magnetic detection elements) onto a single integrated chip, allowing them to function as one unified detection unit. This merging approach enables the system to detect magnetic fields from separated conductors while maintaining measurement accuracy, as the relative positions of the detection elements on the chip are fixed and precise, eliminating displacement errors that would occur with separate chips.
2Measurement precision
If multiple electromagnetic conversion elements are placed opposite each other to detect currents, then the measurement capability is improved, but integration into a single chip becomes difficult, hindering size reduction
Solution Approach 1:
The patent successfully integrates multiple electromagnetic conversion elements (magnetic detection elements) onto a single integrated chip, resolving the contradiction between measurement capability and integration difficulty. The chip includes first and second magnetic detection elements with their respective sensitive axes arranged to detect magnetic fields from conductors, achieving both accurate current detection and compact integration.
3Measurement precision
If the conductor is placed between electromagnetic conversion elements, then the magnetic field detection is improved, but the elements cannot be integrated into one chip
Solution Approach 1:
The patent arranges magnetic detection elements with their sensitive axes in directions perpendicular or substantially perpendicular to the flowing direction of the measured current. This dimensional arrangement allows the elements to be integrated on a single chip while still effectively detecting the magnetic field generated by the conductor passing between them, as the detection occurs in a direction orthogonal to the current flow.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively reduces measurement errors and enables the integration of magnetic sensor elements onto a single substrate, leading to a more compact current sensor with improved accuracy.
Implementation Method 1
a first magnetic sensor element and a second magnetic sensor element that detect an intensity of a magnetic field generated by the current
Data Source
AI summary
A current sensor includes a conductor through which a current to be measured flows, and first and second magnetic sensor elements that detect an intensity of a magnetic field generated by the current. The conductor includes first and second flow portions through which the current flows after the current is shunted. The first and second magnetic sensor elements are provided between the first and second flow portions in a thickness direction of the conductor. At least a portion of each of the first and second magnetic sensor elements is provided between the first and second flow portions in a width direction of the conductor. In the width direction of the conductor, a distance between a center portion of the first magnetic sensor element and a center portion of the second magnetic sensor element is less than or equal to a distance between the first flow portion and the second flow portion.