LED Lighting Device Reducing Flicker with Charge Storage
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Solution Overview
Problem
LED lighting devices driven by rectified AC voltage experience flicker, which can cause human discomfort and neurological issues due to variations in luminous flux and intensity, necessitating a solution to mitigate this phenomenon.
Innovation Solution
The LED lighting device incorporates a luminescent device, a charge storage unit, and a current controller with multiple current control units to regulate current and maintain consistent luminance, using a power supply circuit that converts AC voltage and employs charge storage to sustain the luminescent device's operation across varying voltage conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If LED lighting device is directly driven by rectified AC voltage, then the device structure is simple, but flicker occurs causing luminous variation and human discomfort
Solution Approach 1:
The charge storage unit is charged in advance during the voltage peak period before the voltage drops, storing energy that will be discharged later to maintain LED operation during voltage valleys, preventing flicker before it occurs
Solution Approach 2:
The charge storage unit ensures continuous current supply to the LED by discharging during voltage valleys, making the useful action (light emission) continuous rather than intermittent, thereby eliminating flicker while maintaining relatively simple device structure
2Object-affected harmful factors
If multiple current control units are added to regulate current, then flicker is reduced, but device complexity increases
Solution Approach 1:
The charge storage unit acts as an intermediary between the rectified AC voltage source and the LED, buffering voltage variations and providing smooth current delivery, thereby reducing flicker without requiring complex real-time control circuits
Solution Approach 2:
The current control units dynamically adjust the current parameters (current limits, charge/discharge thresholds) based on voltage conditions, optimizing the balance between flicker reduction and device complexity by adapting operation modes to instantaneous voltage states
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 effectively reduces flicker by maintaining consistent luminance and extending the turn-on time of the luminescent device, thereby minimizing luminous variation and improving the overall flicker performance of the LED lighting system.
Implementation Method 1
a charge storage unit C1. The charge storage unit C1 is configured to supply the first current when the rectified AC voltage is smaller than a voltage established across the charge storage unit
Implementation Method 2
A light-emitting diode (LED) lighting device
Implementation Method 3
The luminescent device is driven by a rectified AC voltage for providing 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, thereby improving flicker phenomenon.