Low Power Wall Switch Circuit Using Leakage Current
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Solution Overview
Problem
Conventional wall switch modules require a neutral connection to operate, which is costly to install and does not support compact fluorescent lamps (CFLs) due to high impedance and energy efficiency, limiting their application.
Innovation Solution
A very low power switching circuit using leakage current, incorporating a triac to control loads with a microprocessor and radio frequency receiver, capable of operating without a neutral connection, and utilizing a storage capacitor to minimize power consumption, allowing control of various load types including CFLs and incandescent bulbs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional wall switch module is used without a neutral connection, then installation cost is reduced, but the switch cannot operate reliably or support modern lighting loads
Solution Approach 1:
The patent introduces a high-impedance input circuit as an intermediary that couples to the AC power supply through the live wire and ground connection. This intermediary circuit extracts minimal current (less than 5 mA) to power the control electronics without requiring a neutral connection, thereby resolving the contradiction between installation simplicity and operational reliability
Solution Approach 2:
The patent changes the electrical parameters of the switching circuit by using a high-impedance design that operates with extremely low current consumption. By operating at the edge of detectable current levels (microamp to milliamp range), the system achieves reliable operation without neutral connection, transforming the traditional high-current requirement into a low-current solution
2Device complexity
If a conventional wall switch module without neutral connection is used, then wiring complexity is reduced, but power consumption increases and CFL support is lost
Solution Approach 1:
The patent replaces traditional mechanical relay switching with electronic TRIAC-based switching controlled by a microprocessor. This substitution enables precise control of power consumption, allowing the system to operate efficiently with CFLs and LEDS while maintaining simple wiring. The electronic control circuit consumes minimal power compared to mechanical alternatives
Solution Approach 2:
The patent implements periodic sensing and control cycles where the microprocessor periodically monitors the switching state and adjusts power delivery accordingly. This periodic operation allows the system to remain in a low-power standby state between cycles, reducing overall power consumption while maintaining the ability to control various load types including CFLs
3Adaptability or versatility
If high current is provided to support CFL loads, then load compatibility is improved, but power consumption at the wall switch increases
Solution Approach 1:
The patent designs a universal control circuit based on TRIAC switching that can handle multiple load types (incandescent, CFL, LED) through a single unified approach. The microprocessor-controlled TRIAC circuit provides phase-angle control that works effectively across different load impedances, achieving load compatibility without requiring high continuous current at the wall switch location
Solution Approach 2:
The patent creates an electrical model or equivalent circuit representation that simulates appropriate loading conditions for different lamp types. By using control signals rather than direct high current paths through the wall switch, the system replicates the effect of supporting various loads while maintaining minimal local power consumption
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 efficient and cost-effective operation of wall switch modules without a neutral connection, supporting a wide range of loads with reduced power consumption and flexibility in lighting control, including CFLs and incandescent bulbs, while simplifying circuitry and reducing costs.
Implementation Method 1
The wall switch control module may include a triac to control loading in order to minimize the total current consumption and/or control the power output level.
Implementation Method 2
According to another embodiment, the wall switch controller can include a storage capacitor coupled to the DC electrical power supply, for storing electrical power to operate the rest of the circuitry.
Implementation Method 3
The wall switch control module may be configured to receive and operate with leakage current conducted between a live and the ground connection for converting AC electrical power to a DC electrical power.
Data Source
AI summary
A method and apparatus are provided for operating a wall switch module using leakage current. In one embodiment, the wall switch module may be operable using leakage current. The wall switch control module may be provided to include a microcontroller, wireless receiver and triac. The wall switch control module may be configured to control power applied to a load. In another embodiment, one or more signals received by the wireless receiver may be useable to control power applied to a load coupled to the wall switch control module. According to another embodiment, the wall switch control module may be useable for home automated systems.