Self-Powered Switch Using Electromagnetic Induction for Wireless Control
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Solution Overview
Problem
Conventional electrical switches require hard-wired connections or batteries, which can be inconvenient for relocation and maintenance, especially since wireless switches with batteries have limited lifetimes.
Innovation Solution
A self-powered switch with a coil assembly and permanent magnet that moves relative to each other in response to user input, using an energy harvesting circuit to generate voltage for wireless communication, allowing for battery-free operation and wireless control of electrical devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless switches use batteries to enable wireless operation, then wireless control capability is improved, but device lifetime is limited due to battery replacement requirements
Solution Approach 1:
The switch generates its own operating power through electromagnetic induction when the coil assembly and permanent magnet move relative to each other during switching operation. This self-powered mechanism eliminates the need for external battery replacement, resolving the contradiction between wireless operation capability and limited device lifetime.
Solution Approach 2:
The switch utilizes periodic mechanical movement of the coil assembly and permanent magnet during normal switching operation to continuously generate electromagnetic energy. This periodic action converts mechanical motion into electrical energy, providing sustained power without batteries and eliminating the lifetime limitation imposed by battery replacement cycles.
2Reliability
If conventional switches use hard-wired connections to ensure reliable power supply, then power supply stability is improved, but device adaptability is reduced due to relocation difficulties
Solution Approach 1:
The invention replaces the mechanical hard-wired connection system with an electromagnetic power generation system. The coil assembly and permanent magnet generate electrical energy through relative movement, eliminating the need for physical wiring connections. This substitution maintains power supply reliability through controlled electromagnetic induction while enabling easy relocation without wall modifications.
Solution Approach 2:
The switch employs dynamic relative movement between the coil assembly and permanent magnet to generate power on-demand. This dynamic mechanism allows the switch to adapt to different locations without fixed wiring constraints, resolving the contradiction between power supply stability and relocation capability by making the power generation intrinsic to the switching action itself.
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
Enables wireless control of electrical devices without the need for batteries or wired connections, providing a convenient and maintenance-free solution for switching applications.
Implementation Method 1
a coil assembly and a permanent magnet arranged therein such that at least one of the coil assembly and the permanent magnet move relative to each other responsive to movement of the user input member
Data Source
AI summary
Self-powered switches include a switch housing having an externally accessible user input member, a coil assembly, and a magnet arranged therein such that at least one of the coil assembly and the magnet move relative to each other responsive to movement of the user input member between first and second switch positions, and a control circuit held in the switch housing and coupled to first and second terminals of the coil assembly. The control circuit is configured to detect respective electrical characteristics of the first and second terminals of the coil assembly responsive to the movement of the user input member, and selectively transmit first and second wireless control signals to a remote receiver based on the respective electrical characteristics of the first and second terminals of the coil assembly, respectively. Related circuits and methods of operation are also discussed.