Fluxgate Magnetic Sensor Discrete Compensation Lookup Table
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Solution Overview
Problem
Fluxgate magnetic sensors face challenges with high power consumption and slow response times due to iterative feedback operations, which are not suitable for low-power applications like IoT devices and high-speed magnetic field measurements.
Innovation Solution
A sensor system that includes a control circuit and a processing circuit, which selects discrete compensation current settings from a mapping table to generate compensation magnetic fields of specific strength levels, reducing the number of measurement cycles and power consumption while improving linearity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If iterative feedback operations are used to achieve accurate magnetic field measurements, then measurement precision is improved, but power consumption increases and response time decreases
Solution Approach 1:
The patent pre-calculates and stores compensation current values in a lookup table corresponding to different sensor output voltages. Instead of performing iterative feedback calculations in real-time, the system directly retrieves the appropriate compensation current from the pre-computed table, eliminating the need for continuous iterative operations and significantly reducing power consumption while maintaining measurement accuracy.
Solution Approach 2:
The patent creates a simplified model of the magnetic field measurement and compensation process by pre-computing the relationship between sensor outputs and required compensation currents. This computational model is stored in a lookup table, allowing the system to copy or retrieve pre-determined compensation values rather than recalculating them iteratively, thereby reducing real-time computational burden and power consumption.
2Measurement precision
If iterative feedback operations are used to achieve accurate magnetic field measurements, then measurement precision is improved, but response time increases
Solution Approach 1:
The patent pre-calculates and stores compensation current values in a lookup table corresponding to different sensor output voltages. Instead of performing iterative feedback calculations in real-time, the system directly retrieves the appropriate compensation current from the pre-computed table, eliminating the need for continuous iterative operations and significantly reducing response time while maintaining measurement accuracy.
Solution Approach 2:
The patent creates a simplified model of the magnetic field measurement and compensation process by pre-computing the relationship between sensor outputs and required compensation currents. This computational model is stored in a lookup table, allowing the system to copy or retrieve pre-determined compensation values rather than recalculating them iteratively, thereby reducing real-time computational burden and response time.
3Productivity
If discrete compensation current settings are used instead of continuous iterative adjustment, then productivity is improved, but measurement precision may be compromised
Solution Approach 1:
The patent segments the continuous range of compensation currents into discrete levels corresponding to different sensor output voltage ranges. By dividing the measurement range into segments and assigning appropriate compensation current levels to each segment, the system achieves fast discrete compensation while maintaining sufficient measurement precision for practical applications.
Solution Approach 2:
The patent changes the compensation current parameter based on the sensor output voltage level. Different compensation current values are selected according to the measured magnetic field strength, allowing the system to adapt to varying field conditions while maintaining fast response times through discrete parameter selection rather than continuous adjustment.
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 system reduces response time and power consumption while providing accurate and linear magnetic field measurements, making it suitable for low-power and high-speed applications.
Implementation Method 1
The second coil is magnetically coupled to the first coil
Implementation Method 2
provide a second signal representing a compensation current setting to a second coil that surrounds the region
Data Source
AI summary
In some examples, an apparatus comprises a first coil, a second coil, a control circuit, and a processing circuit. The second coil is magnetically coupled to the first coil. The control circuit has a signal output coupled to the first coil, and a control output, and the control circuit configured to: responsive to a state of the control input, select a field strength level from a set of discrete field strength levels; and provide a first signal representing the selected field strength level at the signal output. Also, the processing circuit has processing inputs and a processing output, the processing inputs coupled to the second coil, the processing output coupled to the control input, and the processing circuit configured to, responsive to a second signal across the processing inputs, set a state of the processing output representing a polarity of a magnetic field sensed by the second coil.