Magnetic Sensor Compensating Coil Integration for Power Reduction
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Solution Overview
Problem
Existing magnetic sensors with compensating coils have low generation efficiency of canceling magnetic fields, leading to increased power consumption and thermal noise due to the need for high current flow.
Innovation Solution
A magnetic sensor design integrating first and second magnetic layers opposed through a magnetic gap, a magnetosensitive element, and a compensating coil wound around these layers, enhancing the generation efficiency of the canceling magnetic field by optimizing the positional relationship and integration within a sensor chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the compensating coil is disposed at a position overlapping the magnetosensitive element and wound along it, then the magnetic sensor can generate a canceling magnetic field, but the generation efficiency of the canceling magnetic field is low
Solution Approach 1:
The compensating coil is integrated with the magnetic layers to form a unified structure. The coil is wound around the magnetic layers, merging the compensating function with the magnetic path structure, thereby improving generation efficiency without increasing power consumption
Solution Approach 2:
The compensating coil is positioned in a different spatial arrangement relative to the magnetosensitive element, not directly overlapping but arranged to optimize magnetic field generation efficiency through improved geometric positioning
2Reliability
If a large current is made to flow in the compensating coil to generate a sufficient canceling magnetic field, then the canceling magnetic field becomes sufficient, but power consumption increases and thermal noise increases
Solution Approach 1:
By merging the compensating coil with the magnetic layers, the magnetic path efficiency is improved, allowing sufficient canceling magnetic field to be generated with lower current, thus reducing power consumption
Solution Approach 2:
The design changes the geometric parameters and spatial arrangement of the compensating coil relative to the magnetosensitive element, optimizing the magnetic field generation efficiency to reduce the current required for sufficient cancellation
3Reliability
If a large current is made to flow in the compensating coil, then the canceling magnetic field becomes sufficient, but thermal noise of the magnetosensitive element increases due to heat generation
Solution Approach 1:
The integration of the compensating coil with the magnetic layers creates an efficient magnetic path that generates sufficient canceling field with minimal current, thereby minimizing heat generation and thermal noise affecting the magnetosensitive element
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 design reduces the current required in the compensating coil, lowering power consumption and thermal noise while maintaining effective magnetic field cancellation for the magnetosensitive element.
Implementation Method 1
a compensating coil wound around the first and second magnetic layers
Implementation Method 2
a magnetosensitive element disposed on a magnetic path formed by the magnetic gap
Data Source
AI summary
Disclosed herein is a magnetic sensor that includes first and second magnetic layers opposed to each other through a magnetic gap, a magnetosensitive element disposed on a magnetic path formed by the magnetic gap, and a compensating coil wound around the first and second magnetic layers. The first magnetic layer, second magnetic layer, magnetosensitive element, and compensating coil are integrated in a sensor chip.