Three Half-Bridge AMR Sensor System for Noise Reduction
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Solution Overview
Problem
Magnetic sensor systems, particularly AMR sensor systems, face challenges with low-amplitude and noisy output signals, high costs, and increased effort in size and current consumption, which affect their reliability and accuracy in sensing magnetic fields and rotational movements.
Innovation Solution
A sensor system comprising three half-bridge configurations with redundant measurement signals, where each half-bridge is formed by two sensing elements connected in series, allowing for reliable and low-noise signal output with reduced costs and effort, utilizing magnetoresistive sensing elements like AMR for precise magnetic field measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Wheatstone full-bridge configuration with at least four AMR sensing elements is used, then measurement precision is improved, but device complexity and costs increase
Solution Approach 1:
The patent combines two half-bridge configurations to form a single sensor system with six sensing elements. The half-bridges share a common excitation voltage and are arranged in parallel, merging their measurement capabilities while reducing overall system complexity compared to using separate full-bridge configurations.
Solution Approach 2:
The patent segments the full-bridge configuration into two independent half-bridge configurations, each with three sensing elements. This segmentation allows for simplified individual half-bridge designs that can be easily combined, reducing the complexity of each unit while maintaining overall measurement precision through redundant measurement paths.
2Reliability
If two Wheatstone full-bridge configurations are used, then reliability is improved, but productivity and cost efficiency deteriorate
Solution Approach 1:
The patent merges two half-bridge configurations into a single integrated sensor system that provides redundant measurement paths. This merging achieves reliability through redundancy while optimizing resource utilization, thereby improving cost efficiency compared to implementing two separate full-bridge configurations.
Solution Approach 2:
The sensor system with two half-bridges serves multiple functions: it provides primary measurement capability through one half-bridge and redundant measurement capability through the other half-bridge. This multi-functionality ensures reliability while optimizing production costs by using a single integrated structure rather than multiple separate systems.
3Measurement precision
If AMR sensor systems with reference bridge are used, then measurement capability is improved, but output signal quality deteriorates due to low amplitude and noise
Solution Approach 1:
The patent creates a redundant copy of the measurement path using the second half-bridge configuration. By having two independent measurement paths that can be cross-validated, the system can detect and correct measurement errors, thereby improving output signal quality and reliability while maintaining measurement capability.
Solution Approach 2:
The dual half-bridge configuration enables feedback-based error detection and correction. The signal processing device can compare measurements from both half-bridges, identify discrepancies, and correct errors, thereby improving output signal quality while maintaining the measurement capability provided by the AMR sensing elements.
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 provides reliable and low-noise signal outputs, enables fault detection and reduction of measurement errors, and allows for precise measurement of rotational movements with reduced size and cost, improving operational reliability and accuracy.
Implementation Method 1
sensors based on the magnetoresistive effect such as anisotropic magnetoresistive (AMR) and giant magnetoresistive (GMR) sensors
Implementation Method 2
The sensing principle of AMR sensor systems is based on the physical phenomenon that the electric resistance of a ferromagnetic material depends on the angle between the magnetization and the direction of the electric current within an AMR sensing element
Implementation Method 3
A typical AMR sensor system comprises a Wheatstone full-bridge configuration built with magnetoresistive sensing elements
Data Source
AI summary
A sensor system for sensing a physical quantity is disclosed. The sensor system includes a first sensor path comprising a first first sensing element and a second first sensing element and a first intermediate node being provided in between the first first sensing element and the second first sensing element. The sensor also includes a second sensor path comprising a first second sensing element and a second second sensing element and a second intermediate node being provided in between the first second sensing element and the second second sensing element. A third sensor path is provided and comprises a first third sensing element and a second third sensing element and a third intermediate node being provided in between the first third sensing element and the second third sensing element. A signal processing device is also included.