Angled Set/Reset Coil Magnetometer for Low Power Initialization
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Solution Overview
Problem
Magnetometers used in mobile devices face challenges in achieving high accuracy and reliability while minimizing power consumption, especially in high magnetic field environments, as they require strong set/reset fields that increase power consumption.
Innovation Solution
The design incorporates a set/reset coil with portions that cross sensing strips at an angle, reducing the current needed to initialize the magnetometer, utilizing a planar set/reset coil oriented at a specific angle with respect to the sensing strips to create a magnetic field angled with respect to the easy axis of magnetization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stronger set/reset field is applied to improve sensor reliability and accuracy in high magnetic field environments, then the magnetometer can operate more effectively, but power consumption increases due to higher current requirements
Solution Approach 1:
The patent changes the geometric parameter of the set/reset coil by orienting it at a 45-degree angle relative to the sensing strips, rather than the conventional parallel orientation. This angular parameter change optimizes the magnetic field coupling between the coil and the sensing elements, enabling effective magnetization switching at lower current levels and thus reducing power consumption while maintaining sensor reliability
Solution Approach 2:
The invention introduces a new spatial dimension to the coil orientation by rotating it 45 degrees from the conventional alignment. This dimensional change in the coil's angular position creates more efficient magnetic field interaction with the sensing strips, achieving the same magnetization effect with reduced current and power consumption
2Ease of operation
If higher current is supplied to the set/reset coil to improve magnetometer effectiveness, then the sensor can initialize more reliably, but the power consumption penalty outweighs the benefits
Solution Approach 1:
By changing the orientation parameter of the set/reset coil to 45 degrees, the patent optimizes the magnetic field generation efficiency. This parameter change allows the system to achieve reliable initialization with lower current, making the device easier to operate without the power consumption penalty that would otherwise outweigh the benefits
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 approach reduces the current required for set/reset operations by up to 40%, thereby lowering power consumption and enhancing the efficiency and reliability of magnetic field sensors in mobile devices.
Implementation Method 1
Based on Ampere's law, the field generated by the conductive coils is proportional to the current applied
Implementation Method 2
anisotropic magnetoresistance (AMR) causes a change in resistance of a thin strip of ferrous material when a magnetic field is applied perpendicular to a current flowing in the strip
Data Source
AI summary
A magnetometer with a set/reset coil having portions that cross portions of sensing strips at an angle in order to create a magnetic field in the sensing strip that is at an angle with respect to the easy axis of magnetization of the sensing strip. Each sensing strip may have a portion having a magnetic field created therein that is different from a magnetic field created in another portion of the same sensing strip. As a result, a lower set/reset coil current is needed to initialize the magnetometer.