Time-Sharing AC Outlet Switch Box
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Solution Overview
Problem
Existing methods for connecting multiple high current capacity outlets are costly and time-consuming, and risk overheating or fire due to excessive current draw when attempting to split a single outlet for multiple loads.
Innovation Solution
A two-pole, double-throw (2PDT) or three-pole, double-throw (3PDT) switch is used to safely switch active wires between multiple outlets, allowing for time-sharing of high current capacity outlets without exceeding maximum rated current, with optional automatic microcomputer-controlled switching and voltage/current measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an extension cord-like apparatus is used to split the outlet for multiple loads, then accessibility and ease of connection are improved, but current overload risk increases leading to overheating and fire hazards
Solution Approach 1:
The patent introduces a switching device as an intermediary between the outlet and multiple loads. This device includes a power source connector, multiple receptacles, and switching mechanisms that safely distribute power, preventing direct parallel connection that would cause current overload. The intermediary controls current flow to ensure it does not exceed the outlet's rated capacity.
Solution Approach 2:
The patent replaces simple mechanical parallel connection (extension cord) with an electronically controlled switching system. The switching device uses electrical switches and control circuits to manage power distribution, replacing the passive mechanical connection with an active controlled system that monitors and regulates current flow.
2Reliability
If wiring is done to create multiple permanent outlets, then reliability and safety are improved, but cost and installation time increase
Solution Approach 1:
The patent segments the permanent wiring solution into a portable, plugable device. Instead of requiring hardwired installation for multiple outlets, the system divides the function into a power source connector that plugs into one outlet and multiple receptacles that can be moved and reconfigured as needed, eliminating the need for time-consuming electrical wiring while maintaining safety through integrated switching mechanisms.
Solution Approach 2:
The switching device serves multiple functions: it provides multiple receptacles for different loads, implements automatic or manual switching between loads, monitors power distribution, and ensures safety through overcurrent protection. This multi-functional device replaces the need for multiple permanent wiring installations.
3Reliability
If automatic switching control is implemented, then current distribution control is improved preventing overload, but device complexity increases
Solution Approach 1:
The patent implements feedback control where sensors detect the presence and power consumption of connected loads, and this information feeds back to the switching mechanism. The controller uses this feedback to automatically determine which load should receive power, monitor current levels, and switch between loads accordingly, ensuring current never exceeds the outlet's rated capacity while maintaining simple operation for the user.
Data Source
AI summary
Methods and apparatus can be used to turn an existing 240 VAC or 480 VAC/600 VAC outlet into two or more time-sharing, i.e., one operating at a time, outlets. An AC switch box with two time-sharing outlets can be made with either a mechanical switch for switching which load receives power, or automatically, by a microcomputer system, for example. In the automatic AC switch box, the non-favored outlet may be typically powered on unless a load is detected at the favored/default outlet, when power to the non-favored outlet is automatically disconnected until the load is reduced or eliminated.