LED Lighting Device Flicker Reduction via Charge Storage
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Solution Overview
Problem
LED lighting devices driven by rectified AC voltage experience flicker due to variations in luminous flux and intensity, which can cause human discomfort and neurological issues, necessitating a solution to mitigate these effects.
Innovation Solution
The LED lighting device incorporates a luminescent device, a current control unit, and a charge storage unit. The current control unit regulates currents to prevent exceeding set values, while the charge storage unit supplies current when rectified AC voltage is insufficient, ensuring consistent illumination and reducing flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If LEDs are directly driven by rectified AC voltage, then the device structure is simple, but flicker occurs causing human discomfort and neurological issues
Solution Approach 1:
The charge storage unit pre-stores electrical energy during voltage peaks and the current control unit pre-regulates current levels, so that when rectified AC voltage drops, the stored energy and regulated current maintain stable LED operation, preventing flicker before it occurs
Solution Approach 2:
The current control unit and charge storage unit act as intermediary components between the rectified AC voltage source and the LEDs, buffering and regulating the power delivery to eliminate direct coupling that causes flicker
2Illumination intensity
If multiple LEDs are coupled in series to provide required luminance, then the luminance requirement is met, but the circuit becomes more complex and vulnerable to voltage variations
Solution Approach 1:
The current control unit continuously monitors the current flowing through the series-connected LEDs and adjusts the driving current in real-time based on feedback signals, maintaining stable luminance output despite voltage variations in the rectified AC supply
3Object-affected harmful factors
If current regulation is applied to reduce flicker, then flicker is reduced, but the device complexity increases
Solution Approach 1:
The system dynamically changes the current regulation parameters, adjusting the current setting and charge storage levels based on the instantaneous rectified AC voltage conditions, allowing effective flicker reduction while adapting to different operating conditions
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 solution maintains consistent luminance and reduces flicker, allowing the LED lighting device to operate effectively regardless of rectified AC voltage levels, thereby improving human comfort and reducing neurological impacts.
Implementation Method 1
The charge storage unit is configured to supply the first current when the rectified AC voltage is smaller than a first voltage established across the charge storage unit
Implementation Method 2
The luminescent device, configured to provide light according to first current
Data Source
AI summary
An LED lighting device driven by a rectified AC voltage includes a luminescent device, a charge storage unit and a current controller. The charge storage unit is configured to turn on the luminescent device when the rectified AC voltage is still insufficient to turn on the luminescent device. The current control unit is configured to allow the LED lighting device to have constant luminance regardless of the level of the rectified AC voltage or dimmer condition, thereby improving flicker phenomenon.