Ceiling Fan BLDC Control Using Half-Cycle Phase Loss Signals
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Solution Overview
Problem
Conventional wire-controlled ceiling fan structures face complexity in switching between different speeds and controlling directional airflow due to complicated wiring, leading to structural instability and poor convenience in installation and use.
Innovation Solution
A control device and method that utilizes a wire-controlled circuit control device and a brushless motor control device, incorporating microcontrollers and half-cycle phase detectors, to simplify wiring and enable multi-step speed and forward/reverse rotation control of ceiling fan motors by interpreting half-cycle phase loss signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional wiring structure is used for wire-controlled ceiling fan, then basic control function is achieved, but wiring complexity increases and installation convenience deteriorates
Solution Approach 1:
The patent combines multiple control functions (speed regulation, forward/reverse rotation control) into a single integrated control device that processes both positive and negative half-cycle signals. This merging of functions into one unit reduces the number of separate components and wiring connections needed, thereby simplifying installation while maintaining full control capability.
Solution Approach 2:
The control device is designed to handle multiple functions through a universal architecture: it can detect both positive and negative half-cycle phase losses, control multiple speed levels, and manage bidirectional rotation. This multi-functional design eliminates the need for separate wiring systems for each function, reducing overall wiring complexity.
2Reliability
If conventional wiring structure is used for wire-controlled ceiling fan, then basic control function is achieved, but structural stability deteriorates
Solution Approach 1:
By integrating half-cycle detection, signal processing, and motor control into a single unified device, the patent reduces the number of connection points and wiring interfaces. This consolidation minimizes potential failure points in the wiring system, thereby improving structural stability while reducing wiring complexity.
3Adaptability or versatility
If wire-controlled circuit control device with half-cycle phase detection is implemented, then speed and directional control is achieved, but device complexity increases
Solution Approach 1:
The control device employs a universal design that handles multiple control tasks through integrated circuits: the same device detects both positive and negative half-cycle phase losses, processes speed regulation signals, and controls bidirectional rotation. This multi-functional integration increases versatility while actually reducing overall structural complexity compared to having separate devices for each function.
Solution Approach 2:
The patent replaces mechanical control mechanisms (separate switches, mechanical timers, multiple relays) with electronic half-cycle phase detection and digital signal processing. This substitution consolidates multiple mechanical components into integrated electronic circuits, reducing physical device complexity while enhancing control functionality.
4Ease of operation
If simplified wiring structure is implemented, then installation convenience is improved, but control precision may deteriorate
Solution Approach 1:
The patent uses electronic half-cycle phase detection circuits to precisely detect phase loss conditions, replacing less precise mechanical or electrical detection methods. This electronic detection approach maintains high measurement precision while allowing for simplified wiring implementation.
Solution Approach 2:
The control device incorporates intermediary signal processing circuits that filter and condition the half-cycle detection signals before processing. These intermediary circuits ensure that even with simplified wiring, the phase loss detection maintains high precision by eliminating noise and signal interference.
Data Source
AI summary
The present invention relates to a control device and method for adjusting speed and forward/reverse rotation of a wire-controlled brushless motor power supply during positive/negative half-cycle phase loss, comprising an AC power supply, a wire-controlled circuit control device, a brushless motor control device, and a ceiling fan brushless motor, wherein the AC power supply is electrically connected to the wire-controlled circuit control device which is electrically connected to the brushless motor control device and which is electrically connected to the ceiling fan brushless motor, to control the AC power supply positive/negative half-cycle on/off and to generate a positive/negative half-cycle signal for multi-step speed and forward/reverse rotation control, detection, determination, and storage. The overall design is simple and convenient without the need for complicated and cumbersome wiring or safety concerns, to achieve the effect of structural stability and the use of safety and convenience.