Solid-State Touch Switch With Proximity Sensing for Weatherproofing
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Solution Overview
Problem
Existing mechanical switches used in outdoor electronic systems, such as solar-power systems, face challenges in being weatherproof due to their mechanical moving parts, which are prone to degradation and costly to seal against moisture and dust.
Innovation Solution
A solid-state switch utilizing micro-electromechanical systems (MEMS) and CMOS technologies, integrating a cover member, solid-state transducers, a microcontroller, and a user feedback device, which generates signals in response to perturbations and provides feedback without moving parts, reducing material fatigue and enabling easier weatherproofing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical switches are used in outdoor electronic systems, then switching function is achieved, but weatherproofing becomes cumbersome and costly due to mechanical moving parts
Solution Approach 1:
The patent replaces mechanical moving parts with solid-state transducers that detect touch inputs through mechanical coupling to the cover member. This substitution eliminates the need for complex sealing mechanisms while maintaining switching functionality, directly resolving the contradiction between weatherproofing reliability and device complexity.
2Reliability
If mechanical switches are used, then switching function is provided, but material fatigue and failure occur upon repeated use and exposure to outside elements
Solution Approach 1:
The patent replaces mechanical switches with solid-state transducers that have no moving parts subject to wear. The transducers detect touch through mechanical coupling but convert mechanical energy to electrical signals without mechanical contact wear, dramatically extending service life and eliminating material fatigue issues.
Solution Approach 2:
The patent separates the mechanical coupling function (cover member to transducer) from the signal generation function (transducer). This segmentation allows the mechanical structure to be simple and weatherproof while the transducer handles signal generation without mechanical wear, improving durability.
3Ease of manufacture
If solid-state transducers are used, then weatherproofing is simplified, but integration of MEMS and CMOS processing technologies is required
Solution Approach 1:
The patent merges MEMS transducer technology with CMOS processing to create an integrated solid-state switch. This combination leverages the weatherproofing advantages of solid-state technology while using standard semiconductor manufacturing processes, making the solution both easy to manufacture and relatively simple to integrate.
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 solid-state switch effectively detects user inputs and provides feedback while being resistant to environmental degradation, offering a more reliable and cost-effective solution for outdoor electronic systems by eliminating the need for mechanical moving parts.
Implementation Method 1
The first solid-state transducer is mechanically coupled to the cover member and configured to generate first signals in response to a perturbation at the cover member
Data Source
AI summary
A solid-state switch for an external system includes a cover member, a first solid-state transducer, a second transducer, a microcontroller, a user feedback device, and a switching circuit. The first transducer is mechanically coupled to the cover member and configured to generate first signals in response to a perturbation at the cover member. The second transducer is configured to generate second signals in response to the perturbation. The microcontroller is configured to obtain first data from the first signals, second data from the second signals, and determine user inputs in accordance with at least the first data, the second data, and an operational state of the solid-state switch. The user feedback device is configured to provide feedback to a user of the switch in accordance with a switching behavior of the switching circuit. The second transducer is configured as a proximity sensor for detecting proximity of an object to the cover member.