LED Driving Circuit with Dynamic Flicker Elimination
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Solution Overview
Problem
LED lighting apparatuses using AC direct-coupled methods experience flicker and efficiency decline due to differing turn-on driving points, leading to user discomfort and power factor decrease when large capacitive elements are used for flicker management.
Innovation Solution
A light emitting diode (LED) driving circuit with a flicker elimination unit, including a diode, transistor, and capacitive element, and a driving control unit that detects TRIAC dimming signals to pause flicker removal procedures, improving power factor and reducing power loss, while controlling brightness levels using dimming signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a capacitive element with large capacity is used to eliminate flicker, then flicker is removed, but power factor decreases
Solution Approach 1:
The patent applies dynamics by making the capacitive element's connection to the LED module dynamic rather than static. The control unit selectively connects or disconnects the capacitive element based on detected flicker conditions. When flicker is detected, the capacitive element is connected to eliminate it; when no flicker is present, it is disconnected to avoid power factor degradation. This dynamic switching resolves the contradiction between flicker elimination and power factor maintenance.
2Weight of stationary object
If AC direct-coupled method is used to achieve lightness and small size, then device size is reduced, but flicker and efficiency decline occur
Solution Approach 1:
The patent extracts the flicker elimination function into a separate, selectively activatable module. Rather than permanently incorporating large capacitive elements into the AC direct-coupled circuit, the solution extracts the capacitive component and controls its engagement only when flicker is detected. This allows the system to maintain its lightweight, compact AC direct-coupled design while adding flicker elimination capability only when needed, resolving the contradiction between device size and flicker prevention.
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 eliminates flicker, improves power factor, and controls LED brightness levels, enhancing user comfort and energy efficiency by selectively activating the flicker elimination unit based on AC input voltage and dimming signals.
Implementation Method 1
a capacitive element having a large capacity is used
Implementation Method 2
a diode element
Implementation Method 3
a transistor element
Data Source
AI summary
A light emitting diode (LED) driving circuit includes a flicker elimination unit configured to perform a flicker removal for LED modules and a driving control unit configured to pause a procedure of the flicker removal based on an AC input voltage that is regulated through a Triode for Alternating Current (TRIAC) dimmer, so as to cause a brightness of the LED modules to be dimmed. Therefore, the LED driving circuit selectively adjusts an LED brightness level and removes LED flicker by using a TRIAC dimmer and controls the brightness level of the LED module based on a dimming level.