Wi-Fi Load Control Synchronization to Eliminate the Popcorn Effect
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Solution Overview
Problem
Wi-Fi-enabled load control devices experience variability in communication latency due to contention-based shared networks, leading to the 'popcorn effect' where lights turn on or off at different times, creating an undesirable aesthetic.
Innovation Solution
A device configured to control electrical loads, equipped with a controller and a first wireless communication circuit, receives signals with power control commands and synchronization conditions, coordinating adjustments among multiple devices to ensure synchronized power control within a predetermined period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If Wi-Fi technology is used for wireless communication in a contention-based shared network, then wireless control of load control devices is enabled, but variation in communication latency occurs causing the popcorn effect
Solution Approach 1:
The system performs preliminary actions by sending commands to all load control devices in advance and having them prepare to execute simultaneously. A synchronization mechanism is established where devices wait for a trigger signal before executing the power control adjustment, ensuring they all act at the same time despite receiving commands at different moments.
Solution Approach 2:
A master load control device or central controller acts as an intermediary to coordinate the system. This mediator receives the power control command, determines the synchronization condition (when all devices are ready), and triggers simultaneous execution across all devices, eliminating the popcorn effect caused by direct individual command execution.
2Stability of the object's composition
If power control commands are sent to multiple load control devices simultaneously, then all devices should adjust at the same time, but varying latency causes devices to execute at different times
Solution Approach 1:
The system implements feedback by having load control devices acknowledge receipt of commands and report their readiness status. The master device or controller monitors these feedback signals to determine when the synchronization condition is met (all devices ready), ensuring reliable simultaneous execution before triggering the actual power control adjustment.
Solution Approach 2:
Devices perform preliminary actions by preparing to execute the command upon receipt but waiting for a synchronization trigger. This preliminary state allows the system to verify all devices are ready before committing to simultaneous execution, thereby maintaining both synchronization and reliability.
3Device complexity
If load control devices operate independently without coordination, then device complexity is reduced, but the aesthetic quality deteriorates due to the popcorn effect
Solution Approach 1:
The system merges the control functions by having load control devices participate in a coordinated synchronization process. While devices remain physically independent and simple, they are logically combined through the synchronization condition and trigger mechanism, ensuring aesthetic consistency without increasing individual device complexity.
Solution Approach 2:
The synchronization mechanism serves multiple functions: it maintains device independence, ensures simultaneous execution, and guarantees aesthetic consistency. This universal approach allows the same simple device architecture to achieve coordinated behavior across the entire system without requiring complex individual devices.
Data Source
AI summary
A load control device for controlling the power delivered from an AC power source to an electrical load is able to receive radio-frequency (RF) signals from a Wi-Fi-enabled device, such as a smart phone, via a wireless local area network. The load control device comprises a controllably conductive device, a controller for rendering the controllably conductive device conductive and non-conductive, and a Wi-Fi module operable to receive the RF signals directly from the wireless network. The controller may cooperate with one or more other devices to synchronize in time the adjustments made by one or more load control devices that are operable to control the power delivered to one or more electrical loads. The one or more load control devices may also cooperate with one or more Internet based information providers to provide preconfigured and condition based adjustments of the one or more electrical loads.