Ceiling Fan Speed Control Circuit Using a Single Live Wire
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Solution Overview
Problem
In traditional households without a neutral wire, controlling a ceiling fan requires costly modifications such as installing a neutral wire or wireless RF means, making it impossible to control the ceiling fan without increasing installation costs.
Innovation Solution
A single live wired speed control circuit for ceiling fans that uses a chopper unit, SLW electricity acquisition unit, control unit, and speed control unit to allow control signals to flow through a single live wire, enabling control of a ceiling fan motor without a neutral wire by rectifying AC signals into chopped signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a mechanical switch controls a ceiling fan through a single live wire, then installation cost is reduced, but control functionality is lost
Solution Approach 1:
The patent introduces a control board as an intermediary device that receives control signals from a remote controller and converts them into chopped signals that can be transmitted through the existing single live wire to control the ceiling fan motor, thereby enabling remote control functionality without requiring additional wiring
Solution Approach 2:
The patent replaces the traditional mechanical switch with an electronic control system consisting of a control board, remote controller, and chopped signal generation circuitry, substituting mechanical control with electronic signal processing and transmission through the existing live wire
2Ease of operation
If a neutral wire is installed to enable ceiling fan control, then control functionality is achieved, but installation cost increases
Solution Approach 1:
The patent makes the existing live wire serve multiple functions: it continues to provide power to the ceiling fan while simultaneously transmitting control signals from the control board to the motor, eliminating the need for the neutral wire and reducing installation requirements
Solution Approach 2:
The control board acts as a mediator that enables bidirectional communication through the single live wire, allowing control signals to be sent from the remote controller to the motor while maintaining the existing power transmission function
3Ease of operation
If wireless RF controlling means are installed, then control functionality is achieved, but installation complexity increases
Solution Approach 1:
The patent merges the control signal transmission function with the existing power transmission infrastructure by using the live wire for both purposes, combining what would traditionally require separate wireless RF hardware into a unified system that leverages existing wiring
4Ease of manufacture
If a single live wire is used for control, then installation cost is reduced, but signal transmission capability is limited
Solution Approach 1:
The patent changes the parameter of signal transmission by converting standard control signals into chopped signals with specific frequency characteristics that can be effectively transmitted through the live wire, adapting the signal format to suit the transmission medium
Solution Approach 2:
The patent substitutes traditional control signal transmission methods with a chopped signal approach that uses the existing live wire infrastructure, replacing what would require dedicated control wiring with a method that utilizes the power wire for both power and control
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
Provides a cost-effective and efficient solution for controlling ceiling fans in environments lacking a neutral wire, allowing control through a single live wire without modifying existing circuitry, thus reducing installation costs.
Implementation Method 1
The chopper unit is configured to receive one of the control signals outputted from the control unit. The chopper unit chops the control signal into a chopped signal and outputs the chopped signal through the live wire of the AC circuit.
Implementation Method 2
The SLW electricity acquisition unit is configured to acquire electricity from the live wire of the AC circuit.
Data Source
AI summary
A single live wired speed control circuit of a ceiling fan motor includes a single live wire (SLW) electricity acquisition unit that is electrically connected to a live wire of an alternate current (AC) circuit, a chopper unit that is electrically connected to the live wire in series, and a control unit and a speed control unit that are electrically connected to each other. The SLW electricity acquisition unit acquires electricity from the live wire in an environment for the control unit. The speed control unit outputs voltage signals of various voltages to the control unit. The control unit outputs various control signals to the chopper unit. The chopper unit chops one of the received control signals into a chopped signal to output through the live wire to the ceiling fan motor of a ceiling fan, and thus avoid modifying a pre-existing circuitry of the environment.