Integrated Fluxgate Magnetic Gradient Sensor Design
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Solution Overview
Problem
Conventional magnetic field gradient measurement systems require two separate fluxgate sensors, leading to complex subtraction logic, excessive power consumption, and difficulties in implementing matched shunt resistors and amplifiers, making them inefficient and power-intensive.
Innovation Solution
A single integrated fluxgate magnetic gradient sensor combines a common mode sensitive fluxgate magnetometer and a differential mode sensitive fluxgate magnetometer, along with a driver circuit that uses differential and single-ended voltage drivers to compensate for common and differential mode magnetic fields, allowing for precise measurement of magnetic field gradients without the need for matched shunt resistors and amplifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two separate fluxgate sensors are used to measure magnetic field gradient, then measurement capability is achieved, but device complexity and power consumption increase
Solution Approach 1:
The patent combines two separate fluxgate sensors into a single integrated sensor device with four cores (first, second, third, and fourth cores) arranged in an integrated structure. The excitation wire coils and sense wire coils are integrated around these cores, eliminating the need for two separate sensor devices and reducing overall system complexity while maintaining gradient measurement capability.
Solution Approach 2:
The integrated fluxgate sensor performs multiple functions: it measures both the gradient component and the common mode magnetic field simultaneously using its four cores and dual coil configurations. The first and second cores measure the gradient component while the third and fourth cores measure the common mode field, allowing a single device to handle multiple measurement tasks that would otherwise require separate sensors and processing circuits.
2Measurement precision
If two separate fluxgate sensors are used, then measurement capability is achieved, but power consumption increases
Solution Approach 1:
By merging the functionality of two separate fluxgate sensors into a single integrated device with shared excitation and sense circuits, the patent reduces the total power consumption. The integrated structure allows for shared power supply circuits and reduced redundant operations, thereby lowering overall energy requirements while maintaining the capability to measure magnetic field gradients.
3Measurement precision
If conventional systems use two magnetic sensors, then gradient measurement is possible, but implementation of matched shunt resistors and amplifiers becomes difficult
Solution Approach 1:
The patent integrates all measurement functions into a single device, eliminating the need for separate shunt resistors and amplifiers for each sensor. The sense wire coils are directly integrated around the cores, and the output can be processed by a single amplifier circuit, greatly simplifying the manufacturing and implementation process compared to conventional systems requiring matched components for each sensor.
4Device complexity
If a single integrated sensor is used, then device complexity and power consumption are reduced, but achieving precise gradient measurement becomes more challenging
Solution Approach 1:
The integrated sensor is segmented into four distinct cores with specific functional assignments: the first and second cores are configured to measure the gradient component, while the third and fourth cores measure the common mode magnetic field. This segmentation allows each core to perform a specific measurement function, ensuring precise gradient measurement while maintaining an integrated structure that reduces overall complexity.
Solution Approach 2:
Different regions of the integrated sensor have specialized configurations optimized for their specific measurement functions. The excitation wire coils are wound around specific cores with particular orientations to enhance sensitivity to gradient fields, while sense wire coils are positioned to detect common mode fields. This local optimization ensures high measurement precision for each function within the integrated 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
The integrated sensor system effectively measures magnetic field gradients with reduced power consumption and chip area requirements, eliminating the need for complex subtraction logic and matched components, while accurately determining current flow through conductive materials like bus bars.
Implementation Method 1
The first and second cores are wrapped by a first excitation wire coil configured to receive an excitation current that affects a differential mode magnetic field. The third and fourth cores are wrapped by a second excitation wire coil configured to receive an excitation current that affects a common mode magnetic field.
Implementation Method 2
an integrated fluxgate magnetic gradient sensor includes a common mode sensitive fluxgate magnetometer and a differential mode sensitive fluxgate magnetometer
Data Source
AI summary
An integrated fluxgate magnetic gradient sensor includes a common mode sensitive fluxgate magnetometer and a differential mode sensitive fluxgate magnetometer. The common mode sensitive fluxgate magnetometer includes a first core adjacent to a second core. The first and second cores are wrapped by a first excitation wire coil configured to receive an excitation current that affects a differential mode magnetic field. The differential mode sensitive fluxgate magnetometer includes a third core adjacent to the first core and a fourth core adjacent to the second core. The third and fourth cores are wrapped by a second excitation wire coil configured to receive an excitation current that affects a common mode magnetic field.