LED Chain Control Method for Flicker-Free Brightness Adjustment
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Solution Overview
Problem
Existing methods for controlling electrical loads, particularly LED chains, face issues with voltage and current variations during switching operations, leading to flickering and brightness fluctuations due to load surges when switching LEDs on or off, which are not effectively managed without additional components.
Innovation Solution
A method that involves a control unit monitoring and adjusting the current to maintain a constant flow by using controllable switches in parallel with each LED, allowing for sequential switching and extending the switching cycle to compensate for load surges, ensuring nearly constant voltage and minimizing brightness differences across cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LEDs are switched on and off sequentially in series connection, then brightness control is achieved, but voltage and current variations cause flickering and instability
Solution Approach 1:
The control method proactively detects when a load surge is about to occur (when switching on a single load without shutting off another) and preemptively extends the switching cycle by a correction period. This preliminary action prevents the voltage peak and current breakdown before they can disrupt the LED chain operation.
Solution Approach 2:
The switching cycle duration is made dynamic rather than fixed. The control unit adjusts the cycle length by adding a correction period based on real-time detection of load surge conditions. This dynamic adaptation allows the system to maintain current stability while still achieving brightness control through sequential LED switching.
2Illumination intensity
If the number of switched-on LEDs is changed, then brightness is adjusted, but output voltage changes cause current breakdown and flickering
Solution Approach 1:
The control unit continuously monitors the electrical current flowing through the LED chain and uses this feedback information to detect load surges. When a load surge is detected (indicating a change in the number of switched-on LEDs), the system responds by extending the switching cycle, thereby maintaining current continuity and preventing flickering.
Solution Approach 2:
The system changes the time parameter (switching cycle duration) in response to load conditions. By extending the cycle time with a correction period when loads are switched on without corresponding switches off, the system compensates for voltage changes and maintains stable current flow despite changes in the number of active LEDs.
3Device complexity
If switching operations are performed without additional components, then device complexity is reduced, but voltage peaks and current variations increase
Solution Approach 1:
The control method uses the existing control unit and switching infrastructure to detect and compensate for load surges. The system serves itself by using its own monitoring capabilities to identify problematic conditions and automatically adjusting the switching cycle, eliminating the need for additional protective components while still preventing voltage peaks.
Data Source
AI summary
A method for controlling an electrical load of at least two single loads includes activating and deactivating the single loads in switching cycles of predefined duration sequentially following one another. In one switching cycle, the single loads are activated and deactivated alternately with respect to one another.