Magneto-impedance Sensor Wiring for Magnetic Field Cancellation
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Solution Overview
Problem
Existing magneto-impedance sensors face challenges in accurately measuring external magnetic fields due to induced voltages generated by magnetic fields from current flowing in wiring lines, which degrade measurement accuracy.
Innovation Solution
The magneto-impedance sensor design includes a magneto-sensitive body and a conductive layer with an insulating layer in between, where the magneto-sensitive body and conductive layer are connected at one end and allow current to flow in opposite directions, and the wiring lines for these components are configured to be adjacent and pass current in opposite directions to cancel out magnetic fields, thereby reducing induced voltages in detecting conductive wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current is supplied to the magneto-sensitive body to detect external magnetic field, then detection capability is enabled, but magnetic field generated by current acts on detection coil and generates induced voltage causing measurement errors
Solution Approach 1:
The patent applies the principle of converting harm into benefit by utilizing the magnetic field generated by current flowing through the conductive layer to cancel out the harmful magnetic field generated by current in the magneto-sensitive body. The conductive layer is specifically positioned and configured so that its current-generated magnetic field opposes and neutralizes the interference magnetic field, thereby converting a potentially harmful effect into a beneficial cancellation mechanism that improves measurement accuracy.
Solution Approach 2:
The conductive layer serves as an intermediary element between the magneto-sensitive body and the external environment. It mediates the magnetic field interference by generating a counteracting magnetic field that protects the detection system from measurement errors. The conductive layer acts as a buffer that transforms the direct harmful interaction between current-generated magnetic field and detection coil into a controlled cancellation process.
2Measurement precision
If conventional wiring line configuration is used, then device complexity is reduced, but magnetic fields from wiring lines generate induced voltage in detecting conductive wires degrading measurement accuracy
Solution Approach 1:
The patent applies local quality by configuring the wiring lines with different structural characteristics in different regions. The magneto-sensitive body wiring line and conductive layer wiring line are designed with specific local configurations that enable magnetic field cancellation. By optimizing the local arrangement and current distribution in the wiring lines, the system achieves reduced magnetic interference without requiring complete redesign of the entire device structure.
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
This configuration effectively cancels out magnetic fields generated by the wiring lines, preventing induced voltages and improving the accuracy of external magnetic field measurements.
Implementation Method 1
When a current is supplied to the magneto-sensitive body, the current generates a magnetic field therearound and the magnetic field acts on the detection coil. When the current varies with time, the magnetic field that acts on the detection coil varies with time, so that the detection coil generates an induced voltage independently from the intensity of the external magnetic field.
Implementation Method 2
When the current largely varies with time, a voltage corresponding to an intensity of the external magnetic field that acts on the magneto-sensitive body generates in the detection coil. The MI sensor is configured to detect this voltage by the detection circuit to thereby calculate the intensity of the external magnetic field.
Data Source
AI summary
A magneto-impedance sensor which makes it possible to further improve the accuracy of external magnetic field measurement includes a magneto-impedance element, a detection circuit, a magneto-sensitive body wiring line and a conductive layer wiring line. The magneto-impedance element includes a magneto-sensitive body and a conductive layer adjacent to the magneto-sensitive body. The magneto-sensitive body and the conductive layer pass a current therethrough in the opposite directions. The magneto-sensitive body wiring line and the conductive layer wiring line are electrically connected to the magneto-sensitive body and the conductive layer, respectively. A detection coil and a detection circuit of the magneto-impedance element are electrically connected to each other through detecting conductive wires. At least parts of these lines are adjacent to each other and allow a current to pass therethrough in opposite directions.