Magnetic Angle Sensor With Synchronized ADC Sampling
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Solution Overview
Problem
Angle sensors that use multiple magnetic sensors to detect a target magnetic field often experience errors due to differences in detection timing, leading to inaccuracies in generated detection values.
Innovation Solution
The angle sensor system employs multiple magnetic sensors with synchronized analog-to-digital converters to sample detection signals at the same time, using a clock generator to ensure uniform sampling, and performs arithmetic processing to reduce errors caused by noise magnetic fields, with detectors generating signals corresponding to the cosine and sine of the detected angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple magnetic sensors are used to detect the target magnetic field, then measurement precision is improved, but reliability deteriorates due to timing differences causing detection errors
Solution Approach 1:
The detection system is divided into multiple independent magnetic sensors, each capable of detecting the target magnetic field. By segmenting the detection function across multiple sensors and processing their outputs separately before combining results, the system achieves both improved measurement precision through multiple measurements and maintained reliability through proper timing synchronization of each sensor's detection process
Solution Approach 2:
The system uses feedback mechanisms where the detection results from multiple magnetic sensors are processed and compared. The timing information from each sensor is fed back into the processing unit, which adjusts and synchronizes the detection timing to eliminate errors caused by timing differences, thereby maintaining detection reliability while using multiple sensors for improved precision
2Device complexity
If multiple magnetic sensors detect the target magnetic field at different timings, then device complexity is reduced, but measurement precision deteriorates due to temporal variations in the magnetic field
Solution Approach 1:
The system performs preliminary timing synchronization before the actual detection process. By pre-aligning the detection timing of multiple magnetic sensors through synchronized clock signals or timing reference mechanisms, the system ensures that all sensors detect the magnetic field at the same moment, eliminating temporal variation errors while maintaining simple device architecture
Solution Approach 2:
The system changes the timing parameter of detection by using synchronized clock signals to control when each magnetic sensor takes its measurement. By adjusting and standardizing the timing parameter across all sensors through a common clock reference, the system eliminates detection errors caused by temporal variations while keeping the overall device complexity low
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 effectively minimizes errors in detection values by synchronizing sampling times across sensors and using arithmetic processing to account for noise, resulting in more accurate angle detection.
Implementation Method 1
detect a target magnetic field, which is a magnetic field whose direction varies depending on an angle to be detected
Implementation Method 2
analog-to-digital converters in the plurality of magnetic sensors perform sampling at the same sampling time
Data Source
AI summary
An angle sensor includes a first magnetic sensor and a second magnetic sensor. The first magnetic sensor includes first and second detectors, and first and second analog-to-digital converters for converting analog detection signals generated by the first and second detectors into digital detection signals. The second magnetic sensor includes third and fourth detectors, and third and fourth analog-to-digital converters for converting analog detection signals generated by the third and fourth detectors into digital detection signals. The first to fourth analog-to-digital converters perform sampling at the same sampling time.