Capacitive Load Control Interface for Touch and Hover Lighting Control
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Solution Overview
Problem
Traditional load control devices are limited in their ability to respond to complex user actions and provide visual feedback, restricting their functionality and usability with advanced electrical loads.
Innovation Solution
A load control device equipped with a capacitive touch-sensitive surface and control circuit that detects both touch and non-contact gestures to control lighting loads, offering advanced features like intensity and color adjustment, and provides visual feedback through a light bar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional mechanical toggle switches are used, then the device structure is simple, but the functionality is limited and cannot control multiple parameters of advanced electrical loads
Solution Approach 1:
The control device integrates multiple sensing capabilities (capacitive touch sensing, proximity sensing) and multiple control functions (on/off switching, dimming, color temperature adjustment, scene selection) into a single device. The actuation member can detect both contact and non-contact gestures, enabling diverse control operations without requiring multiple separate devices or complex mechanical components.
Solution Approach 2:
The patent replaces traditional mechanical toggle switches with an electronic control system that uses capacitive touch sensors and proximity sensors. The actuation member detects gestures through changes in capacitance and electromagnetic field, eliminating the need for mechanical moving parts while enabling more sophisticated control capabilities.
2Adaptability or versatility
If simple button presses are used for actuation, then the ease of operation is high, but the number and types of control actions are limited
Solution Approach 1:
The control device dynamically responds to different types of user gestures by detecting variations in capacitance change magnitude and duration. The system distinguishes between light touches, heavy presses, and non-contact proximity gestures, automatically adapting its response based on the detected gesture type without requiring the user to learn complex operation modes.
Solution Approach 2:
The patent utilizes changes in capacitance parameters to differentiate between various gesture types. By monitoring both the magnitude and rate of change of capacitance values, the system can distinguish between intentional gestures (such as deliberate non-contact hovers or light touches) and unintentional contacts, enabling nuanced control without increasing operational complexity.
3Loss of information
If traditional load control devices are used, then the device structure is simple, but visual feedback to users about device operation and load state is lacking
Solution Approach 1:
The control device incorporates visual feedback mechanisms that provide real-time information to users about both the device state and the controlled load state. The system displays information such as current dimming levels, active scenes, and load status through visual indicators, enabling users to understand system state without verbal confirmation or complex interfaces.
4Adaptability or versatility
If capacitive touch pads are placed behind the actuation member, then touch actuations can be detected, but non-contact actuations proximate to the front surface cannot be detected
Solution Approach 1:
The patent places the capacitive touch pads behind the actuation member within the device housing, nesting the sensing elements within the existing structure. The actuation member itself serves as part of the sensing mechanism, with its front surface forming a capacitive sensing area that can detect both contact and non-contact gestures without requiring separate external sensors.
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 the capability of load control devices to manage multiple parameters and loads through intuitive gesture recognition, improving usability and aesthetic appeal while maintaining user interaction.
Implementation Method 1
The touch sensitive device may comprise one or more capacitive touch pads located behind the actuation member and arranged adjacent to the touch sensitive surface
Data Source
AI summary
A control device configured for use in a load control system to control an electrical load external to the control device may comprise an actuation member having a front surface defining a capacitive touch surface configured to detect a touch actuation along at least a portion of the front surface. The control device includes a main printed circuit board (PCB) comprising a control circuit, a tactile switch, a controllably conductive device, and a drive circuit operatively coupled to a control input of the controllably conductive device for rendering the controllably conductive device conductive or non-conductive to control the amount of power delivered to the electrical load. The control device also includes a capacitive touch PCB that comprises a touch sensitive circuit comprising one or more receiving capacitive touch pads located on the capacitive touch PCB and arranged in a linear array adjacent to the capacitive touch surface.