Capacitive Touch Load Control With Adaptive Input Filtering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional load control devices are limited in their ability to control advanced electrical loads due to their simple actuation mechanisms and lack of visual feedback, making it difficult for users to perform complex control tasks and navigate multiple operational parameters.
Innovation Solution
A control device with a capacitive touch surface that detects point actuations and uses different filtering techniques based on user input modes to generate output signals for controlling electrical loads, providing visual feedback and enabling advanced control features like gesture recognition and power adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional mechanical toggle switch is used, then the device structure is simple and easy to manufacture, but the control capability is limited and cannot perform advanced functions
Solution Approach 1:
The patent replaces the traditional mechanical toggle switch with a capacitive touch surface that detects touch inputs through capacitance changes. This substitution eliminates moving mechanical parts while enabling advanced control functions including gesture recognition, position-sensitive control, and multiple operational modes, thereby increasing adaptability without proportionally increasing device complexity
Solution Approach 2:
The control device integrates multiple functions into a single unit: it can detect simple button presses, recognize gestures (swipes, taps, holds), provide visual feedback through LEDs, and control various electrical loads with different parameters. This multi-functionality approach allows the device to replace multiple traditional switches while maintaining a compact form factor
2Adaptability or versatility
If a capacitive touch surface with gesture recognition is implemented, then the control versatility is enhanced, but the device complexity increases
Solution Approach 1:
The capacitive touch surface is divided into multiple discrete touch pads arranged in a grid pattern. Each touch pad can be independently detected and processed by the control circuit. This segmentation allows the system to recognize different gestures based on which specific pads are activated and their spatial relationships, reducing the computational complexity compared to analyzing a continuous touch surface
Solution Approach 2:
The control circuit dynamically adjusts its operation based on the detected touch pattern. It can distinguish between different gesture types (tap, swipe, hold) by analyzing the temporal and spatial characteristics of capacitance changes across the touch pads. The system adapts its response based on the gesture recognized, enabling versatile control without requiring complex predetermined logic for every possible input
3Ease of operation
If visual feedback is added to the control device, then the user experience is improved, but the device complexity and power consumption increase
Solution Approach 1:
The visual feedback system uses LEDs that can be activated periodically or on-demand based on user interaction. The LEDs provide feedback during active use (indicating selected options, confirming inputs, showing operational status) and can be deactivated or dimmed during idle periods. This periodic activation pattern provides necessary visual feedback while minimizing overall power consumption
Solution Approach 2:
The visual feedback is provided locally at specific locations on the device corresponding to different control elements or status indicators. Rather than illuminating the entire device, only relevant LED segments are activated based on the current operational context and user input, providing intuitive feedback while consuming minimal power
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
Enhances user interaction and control capabilities by allowing for precise control of electrical loads through advanced gesture recognition and visual feedback, improving usability and aesthetic appeal while accommodating complex control scenarios.
Implementation Method 1
an actuation member having a front surface defining a touch sensitive surface (e.g., a capacitive touch surface) configured to detect a point actuation along at least a portion of the front surface
Data Source
AI summary
A control device configured for use in a load control system to control one or more electrical loads may comprise an actuation member having a front surface defining a touch sensitive surface configured to detect a point actuation along at least a portion of the front surface, a touch sensitive circuit, and a control circuit. The touch sensitive device may comprise one or more receiving capacitive touch pads located behind the actuation member and arranged in a linear array adjacent to the touch sensitive surface. The control circuit may be configured to operate using different filtering techniques based on the state/mode of the control device and/or based on whether the positions of point actuations by a user along the touch sensitive surface indicate a fine tune or gross adjustment by the user. For example, the control circuit may generate an output signal using light/no filtering or using heavy filtering.