Resonant Safety Switch Sensing With Automatic Tolerance Compensation
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Solution Overview
Problem
Existing safety switches in machine safety applications face inaccuracies in switch-on and switch-off distances due to component tolerances, requiring manual adjustment or calibration, which is inefficient and labor-intensive.
Innovation Solution
A safety device with a resonant circuit in the reading unit that measures changes in signal parameters caused by component tolerances, allowing for automatic tolerance compensation of signal parameters, eliminating the need for manual calibration and ensuring accurate switching behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual adjustment or calibration of the reading unit is performed to compensate for component tolerances, then switching precision is improved, but productivity deteriorates due to labor-intensive calibration processes
Solution Approach 1:
The reading unit automatically compensates for component tolerances by measuring the actual oscillating circuit frequency and adjusting signal parameters accordingly, eliminating the need for manual calibration and enabling self-adjustment during operation
Solution Approach 2:
The system measures the actual oscillating circuit frequency and uses this feedback information to automatically adjust signal parameters, creating a closed-loop control system that compensates for component variations without external intervention
2Measurement precision
If manual adjustment or calibration is required to achieve accurate switching behavior, then switching precision is improved, but device complexity increases due to additional calibration procedures
Solution Approach 1:
The reading unit autonomously measures oscillating circuit characteristics and adjusts signal parameters without requiring external calibration equipment or procedures, reducing operational complexity while maintaining precision
Solution Approach 2:
The system automatically changes signal parameters based on measured oscillating circuit frequency variations, adapting to component tolerances through dynamic parameter adjustment rather than static calibration
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 safety device achieves reproducible and accurate switching behavior, reducing the impact of component tolerances and eliminating the need for manual adjustments, enhancing functional reliability and usability in safety-critical applications.
Implementation Method 1
The reading unit has an oscillating circuit whose oscillating circuit voltage is influenced by a transponder located within a reading range
Data Source
Figure 1~2
Figure 3a~3c
AI summary
The invention relates to a security device (1) comprising a base unit (2) and at least one transponder (5) associated with the base unit. The base unit includes a reading unit (3) by means of which information can be read from the transponder when the transponder is located within a reading range relative to the reading unit. The reading unit includes a resonant circuit whose resonant circuit voltage is influenced by a transponder located within the reading range. Measuring means are provided in the base unit by means of which changes in the resonant circuit signals caused by component tolerances can be detected. Depending on the measured values obtained with the measuring means, a tolerance compensation of signal parameters is performed.