Angular Position Sensor Circuit Feedback Linearity
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Solution Overview
Problem
Existing angular position sensor systems face challenges in accurately determining the angular position of rotating objects, especially at high speeds, due to issues like sensitivity to unwanted metal parts, temperature variations, and mechanical inaccuracies, which affect the linearity and robustness of the measurements.
Innovation Solution
A sensor circuit and method that utilize a combination of first and second sensors to measure magnetic field characteristics, with a signal correction block and angle calculation block to provide corrected signals for calculating the angular position using an arctangent function, and a feedback loop to adjust for errors, thereby improving linearity and robustness against environmental and mechanical variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional angular position sensor systems are used, then the system can measure angular position without physical contact, but the measurement precision deteriorates due to sensitivity to metal parts, temperature variations, and mechanical inaccuracies
Solution Approach 1:
The patent implements a feedback mechanism where the calculated angular position is used to generate correction signals that are fed back to adjust the sensor signals. This closed-loop approach compensates for errors caused by metal parts, temperature variations, and mechanical inaccuracies, thereby improving both measurement precision and reliability simultaneously
Solution Approach 2:
The patent dynamically adjusts signal parameters (amplitude, phase, offset) based on the calculated angular position. By changing these parameters through feedback correction, the system maintains high measurement precision across varying environmental conditions and eliminates the trade-off between precision and robustness
2Measurement precision
If signal correction and feedback mechanisms are added to improve linearity, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent achieves multiple functions (signal correction, amplitude balancing, phase correction, offset compensation, and angular position calculation) within a unified feedback-based processing circuit. This multi-functional approach improves linearity while minimizing the increase in device complexity by avoiding separate dedicated circuits for each correction function
3Measurement precision
If calibration tests and precise reference angle measurements are performed to improve accuracy, then the measurement precision improves, but the loss of time increases
Solution Approach 1:
The patent implements a self-calibrating system where the sensor circuit automatically performs correction based on its own output signals. The feedback mechanism continuously adjusts signal parameters without requiring external calibration equipment or reference measurements, thereby achieving high accuracy while eliminating calibration time loss
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 solution provides accurate and robust angular position determination with reduced error and improved linearity, capable of operating effectively in industrial and automotive environments, even at high rotational speeds, and reduces the need for calibration tests and precise reference angle measurements.
Implementation Method 1
an object when rotating relative to the sensor circuit, wherein the object is configured for generating or modulating a magnetic field, the sensor circuit comprising: a) a first sensor configured for measuring of first characteristic of said magnetic field
Data Source
AI summary
A sensor circuit for determining an angular position of a rotating object configured for generating or modulating a magnetic field includes: a first sensor for providing a first sensor signal; a second sensor for providing a second sensor signal a signal correction block for receiving the first/second sensor signal or a signal derived therefrom as a first/second input signal, and for receiving a plurality of feedback signals; and configured for providing a first corrected signal and a second corrected signal; an angle calculation block configured for receiving the first and the second corrected signal, and for determining the angular position signal as a function of a ratio of the first and the second corrected signal; a feedback block configured for receiving the angular position signal, and for generating the plurality of feedback signals based on the angular position signal, with an improved linearity.