AMR Sensor Array Position Detection with Dedicated Signal Conditioning
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Solution Overview
Problem
Conventional magnetoresistive (MR) systems for position detection face limitations such as slow response times, high power consumption, and reduced resolution due to the use of discrete multiplexers and analog-to-digital converters, which process sensor signals serially and struggle with common mode variations between sensors.
Innovation Solution
A position detection apparatus featuring a dedicated sensor signal conditioning circuit for each anisotropic magnetoresistive (AMR) sensor, allowing for parallel or near-parallel polling and processing of sensor data, with a central processor comparing digital position data from multiple sensors to determine the magnet's position, while operating at different voltages and compensating for errors like offset and thermal effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If discrete multiplexers and analog-to-digital converters are used to process sensor signals serially, then device complexity is reduced, but response time increases and productivity decreases
Solution Approach 1:
The patent divides the signal processing function into two parts: (1) a multiplexer that serially selects and transmits sensor signals to reduce complexity, and (2) a dedicated microcontroller unit for each sensor that independently processes its own signal. This segmentation allows parallel processing of multiple sensor signals without requiring a complex multi-channel ADC, thus improving response time while keeping device complexity manageable.
Solution Approach 2:
The patent introduces dedicated microcontroller units as intermediary components between the sensors and the central processor. These microcontrollers act as mediators that perform initial signal processing, conversion, and filtering locally, then transmit only the processed data through the multiplexer. This intermediary approach enables faster local processing while reducing the complexity of the central processing system.
2Measurement precision
If a single analog-to-digital converter is shared among multiple sensors via multiplexer, then device complexity is reduced, but measurement precision decreases due to common mode variations
Solution Approach 1:
The patent segments the signal processing function by assigning a dedicated microcontroller unit to each sensor. Each microcontroller independently processes its sensor's signal through ADC conversion and filtering, eliminating the common mode variations that occur when a single ADC is shared across multiple sensors. This segmentation maintains high measurement precision while avoiding the need for a complex multi-channel ADC system.
Solution Approach 2:
The patent implements local signal processing quality by providing each sensor with its own dedicated microcontroller unit that performs ADC conversion and signal conditioning locally. This ensures that each sensor signal is processed with optimal quality and isolation from other sensors, preventing common mode errors while maintaining manageable device complexity through the use of simple, identical processing units for each sensor.
3Measurement precision
If dedicated signal conditioning circuits are provided for each sensor, then measurement precision and response time improve, but device complexity and power consumption increase
Solution Approach 1:
The patent implements periodic action by enabling each dedicated microcontroller unit to enter a low-power sleep mode when not actively processing sensor data. The microcontrollers are activated only when needed for signal processing and conversion, and remain in low-power states during idle periods. This periodic activation pattern maintains high measurement precision when active while significantly reducing average power consumption across the system.
Solution Approach 2:
The patent applies the discarding and recovering principle by allowing dedicated signal conditioning circuits (microcontroller units) to be dynamically activated and deactivated based on system needs. When full processing capability is not required, these circuits can be powered down or placed in low-power modes, discarding their active state to save power. When precision processing is needed, the circuits are recovered and activated, maintaining measurement precision only when necessary.
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 warm-up time, enhances response speed, decreases power consumption, and significantly increases output resolution, enabling faster and more efficient position detection with improved accuracy and reduced errors.
Implementation Method 1
Each anisotropic magnetoresistive sensor comprises a magnetic field transducer comprising magnetoresistive material and configured to provide an output signal based on an interaction between the magnetic field transducer and a magnet
Data Source
AI summary
An apparatus, method, and associated systems are provided. A plurality of anisotropic magnetoresistive sensors are arranged in an array, each anisotropic magnetoresistive sensor comprising a magnetic field transducer and a sensor signal conditioning circuit. A central processor in electrical communication with each anisotropic magnetoresistive sensor is provided. The central processor is configured to compare processed signals received from at least two of the plurality of anisotropic magnetoresistive sensors to determine a position of the magnet.