Modular Load Control Keypad With Thin Wall-Box Mounting
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Solution Overview
Problem
Existing home automation systems lack a compact and modular design for load control devices, limiting flexibility and ease of installation, particularly in terms of mounting to various types of wall boxes and providing efficient control of electrical loads.
Innovation Solution
A control device comprising a faceplate subassembly and a main control module subassembly, where the faceplate subassembly includes a faceplate, button, circuit board, and back cover, and the main control module subassembly includes a control module that adjusts power delivery to electrical loads in response to button depression, with modular electrical connections for easy installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional non-modular load control device is used, then the device structure is simple, but the device lacks flexibility and ease of installation on various wall boxes
Solution Approach 1:
The load control device is divided into two separate subassemblies: a faceplate subassembly (containing the user interface with buttons and indicators) and a main control module subassembly (containing the control circuitry). This segmentation allows each module to be optimized independently and enables flexible installation configurations, such as mounting only the faceplate on decorative backplates or installing both modules within standard wall boxes.
2Length of moving object
If the control device is made thicker to accommodate all components, then all components can be integrated, but the device cannot be mounted beyond the perimeter of standard wall boxes
Solution Approach 1:
By separating the device into faceplate and main control module subassemblies, the overall thickness is reduced to allow mounting beyond standard wall box perimeters. The faceplate can be mounted flush with the wall surface while the main control module can be positioned in the wall cavity or on the backside of the wall box.
Solution Approach 2:
The modular design distributes components across different spatial dimensions and planes. The faceplate subassembly occupies the front surface plane, while the main control module subassembly can be positioned in the depth dimension (wall cavity), enabling a thin profile at the wall surface while maintaining full functionality.
3Ease of operation
If the device is designed as a single integrated unit, then structural strength is high, but installation and maintenance become more difficult
Solution Approach 1:
The device is segmented into removable subassemblies connected through standardized mounting interfaces (faceplate mounting holes, electrical connections). This allows the faceplate to be easily removed and replaced for maintenance or aesthetic purposes while leaving the main control module installed in the wall, and maintains structural integrity through proper mechanical coupling of the subassemblies.
4Loss of information
If visual indicators are added to provide system feedback, then user awareness of system state improves, but power consumption increases
Solution Approach 1:
The visual indicators (LEDs) are activated periodically or on-demand to provide system feedback rather than remaining continuously illuminated. The control module can pulse the LEDs to indicate different system states (such as loading, ready, error conditions) and then turn them off, significantly reducing power consumption while maintaining effective communication with the user.
Data Source
AI summary
A control device for controlling power delivered to an electrical load includes a faceplate subassembly and a main control module. The faceplate subassembly includes a faceplate, a button, a circuit board, and a back cover. The faceplate includes a front surface and an opposed rear surface, and an opening extending therebetween with the button disposed in the opening in the faceplate. The back cover is positioned adjacent to the circuit board and defines a plurality of holes. A shaft of a post extending from the faceplate is disposed in one of the holes in the back cover and an end of the post is enlarged such that the back cover is captured between the end of the post and the rear surface of the faceplate. The main control module is configured to cause power delivered to the electrical load to be adjusted in response to depression of the button.