LED Controller Timeslot Scheduling for Voltage Stability
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Solution Overview
Problem
Existing LED controllers face issues with undesirable flickering when switching from a smaller group of LEDs to a larger group due to the supply's inability to quickly adjust the output voltage, leading to unstable voltage and current for the additional LEDs.
Innovation Solution
A controller device employs a time-sharing approach by determining specific timeslots for each LED to be turned on, allowing the supply to maintain a stable output voltage during switching patterns, such as the dynamic welcome light function in automotive lighting, by controlling bypass switches to ensure a constant voltage supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple LEDs are turned on simultaneously in a switching pattern, then the lighting effect is enhanced, but voltage instability and flickering occur due to the supply's inability to quickly adjust output voltage
Solution Approach 1:
The patent segments the LED switching into sequential timeslots where LEDs are activated one at a time rather than simultaneously. This segmentation allows the supply to adjust voltage between each LED activation, preventing voltage instability and flickering while maintaining the desired lighting effect through sequential illumination.
Solution Approach 2:
The controller determines and schedules specific timeslots for each LED activation before the switching pattern executes. By pre-planning the sequential activation timing, the system ensures the supply has adequate time to stabilize voltage between LED switches, preventing flickering while achieving the intended lighting sequence.
2Reliability
If the supply is configured to quickly change voltage when switching LED groups, then voltage stability is maintained, but the device complexity increases
Solution Approach 1:
The controller acts as an intermediary between the supply and LEDs, managing the timing sequence to ensure stable voltage operation. Rather than modifying the supply's fundamental capability, the controller coordinates LED switching with supply response, achieving voltage stability without requiring complex supply reconfiguration.
Solution Approach 2:
The system implements periodic sequential activation of LEDs in defined timeslots. This periodic control pattern allows the supply to operate within its stable voltage range by activating LEDs in controlled intervals rather than simultaneously, maintaining voltage stability without requiring the supply to rapidly adjust between different LED group configurations.
Data Source
AI summary
A device is configured to determine a switching pattern comprising a first time range for activating a first plurality of light emitting diodes (LEDs) of a LED module and a second time range for activating a second plurality of LEDs of the LED module. The first plurality of LEDs and the second plurality of LEDs are different. The device is further configured to determine, for each LED of the first plurality of LEDs, a respective timeslot of a plurality of timeslots of the first time range. The device is further configured to output an instruction to a switching device to cause the switching device to couple each LED of the first plurality of LEDs to a supply during the respective timeslot determined for the LED.