Multi-Electrode Capacitive Sensing for Reliable Contactless Detection
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Solution Overview
Problem
Existing capacitive sensor arrangements face challenges in achieving reliable contactless measurement due to interference from unknown capacitance values and additional current paths caused by grounding and other electrical components, which affect the accuracy of proximity and touch detection.
Innovation Solution
A sensor arrangement comprising multiple electrodes with dedicated detectors and a signal generator, allowing for capacitive measurements along different detection paths, and using amplifiers and charge measurement apparatus to enhance measurement reliability by distinguishing between current paths and compensating for interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional capacitive couplings are used to detect measurement currents, then measurement capability is enhanced, but measurement reliability deteriorates due to increased current paths and unknown capacitance values
Solution Approach 1:
The patent divides the measurement system into multiple independent detection paths with separate detectors (first detector for first electrode, second detector for second electrode). Each detector independently measures capacitive coupling along its own path, allowing the system to segment the measurement process and identify reliable readings even when some paths are affected by interference or unknown capacitances.
Solution Approach 2:
The patent implements feedback by comparing measurements from multiple detectors and using this comparison to validate measurement results. The system uses the measurements from different current paths to feedback on the reliability of each path, allowing the system to distinguish between valid measurements and those affected by interference or unknown capacitance values.
2Reliability
If multiple detection paths are implemented, then measurement reliability improves, but device complexity increases
Solution Approach 1:
The patent makes the signal generator and detectors multi-functional by enabling them to operate along multiple detection paths. The same signal generator provides signals for both first and second electrodes, and the detectors can measure different capacitive couplings, reducing the need for entirely separate measurement systems while maintaining multiple detection paths.
Solution Approach 2:
The patent combines multiple detection functions into a unified sensor arrangement where the signal generator and detectors serve multiple purposes. By merging the measurement functionality across different electrodes and current paths into a single integrated system, the patent reduces overall device complexity while maintaining the benefits of multiple detection paths.
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 proposed solution significantly increases measurement reliability by providing independent detection of capacitive couplings and distinguishing between different current paths, making the system less dependent on unknown capacitance values and capable of accurate proximity and touch detection in various applications.
Implementation Method 1
as an object approaches a suitable electrode, a capacitance is formed between the object and the electrode, and this capacitance can store a certain charge
Implementation Method 2
capacitive couplings of detection electrodes with their surrounding environment play a particular role
Data Source
AI summary
A sensor arrangement, in particular for a non-contacting measurement, comprises a signal generator (SRC) which is connected to a first electrode (EL1). A first detector (Det1) is connected to the first electrode (EL1), and is designed for a capacitive measurement by means of the first electrode (EL1). A second detector (Det2) is connected to a second electrode (EL2) and is designed to use the first and the second electrodes (EL1, EL2) to carry out a capacitive measurement. A method for operation of the sensor arrangement is likewise specified.