LED Driver Timing Control via Power Maintenance Capacitor
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Solution Overview
Problem
Current LED dimming systems face instability and imprecision in timing control due to switch leakage and diverse power source conditions, leading to unsynchronized operation and inadequate dimming precision, especially in power-off conditions.
Innovation Solution
A light emitting diode driving system with precise timing switched dimming control, comprising a power detection unit, timer control logic, and power supply unit, which includes an oscillator, volatility memory module, and recovery register to maintain dimming data and settings, allowing for accurate timing and dimming control through a micro control unit and power maintenance capacitor, enabling stable operation and synchronization across different power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If capacitor is used to supply power to flip-flop for maintaining brightness count value in LED switched dimming, then dimming status can be maintained, but unstable operating status and imprecise timing dimming occur due to switch leakage and diverse power source conditions
Solution Approach 1:
The patent applies preliminary action by using a power maintenance capacitor that is pre-charged during power-on conditions to provide power to the timer control logic during power-off conditions. This ensures that the timer control logic maintains operation without requiring external power, thereby achieving stable operating status and precise timing dimming control even when the main power source is disconnected.
2Duration of action of stationary object
If traditional capacitor-based power maintenance is used in LED dimming systems, then power supply during power-off is possible, but synchronization across different power sources cannot be achieved
Solution Approach 1:
The patent implements feedback by having the power detection unit continuously detect the voltage frequency of the power source and feed this information back to the timer control logic. The timer control logic uses this feedback to accurately measure the power source frequency and adjust its internal timing accordingly, ensuring that the dimming control remains synchronized with the power source even during power-off conditions when the power maintenance capacitor is supplying power.
3Adaptability or versatility
If power source conditions vary in LED driving systems, then adaptability to different power sources is improved, but timing control precision deteriorates due to diverse voltage frequencies
Solution Approach 1:
The patent applies parameter changes by having the timer control logic dynamically adjust its internal timing parameters based on the detected power source frequency. The power detection unit measures the actual voltage frequency of the power source, and the timer control logic uses this information to recalculate and adjust its timing parameters, ensuring precise timing control regardless of whether the power source is standard AC power or a different voltage frequency source.
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
The system achieves stable and precise timing dimming control, ensuring synchronization and providing various dimming modes by using a timer control logic, even in power-off conditions, thereby enhancing the operational efficiency and stability of LED lighting systems.
Implementation Method 1
a power supply unit electrically connected to the light emitting diode dimming driver, the power supply unit connected to a power maintenance capacitor through a switch unit, and the power maintenance capacitor supplying desired power voltage to the timer control logic and the power detection unit in the light emitting diode driving system in power-off condition
Data Source
AI summary
A light emitting diode driving system with precise timing switched dimming control used for driving light emitting diode elements is provided, which comprises a power detection unit, a timer control logic, a light emitting diode dimming driver, and a power supply unit being able to overcome different conditions of power source, switch leakage, and system elements to design the timer dimming with steady and precise working status, and solve problems of each of the independent systems which are not synchronized due to imprecisely timed under power-off condition, while providing various dimming mode for users, and a dimming method using aforementioned LED driving system.