AC-Driven LED Circuit with Cross-Connected Branches for Flicker Reduction
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Solution Overview
Problem
AC-driven LED circuits face challenges in matching voltage requirements and reducing flicker, particularly at low frequencies, which complicates the design and implementation of scalable and efficient lighting fixtures.
Innovation Solution
The development of scalable AC-driven LED circuits and assemblies that include parallel and series configurations of LEDs, with cross-connecting branches to ensure current flow during both positive and negative phases of the AC source, reducing flicker and allowing for easier matching of voltage requirements by configuring LEDs in series or parallel to achieve desired performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If LEDs are connected in simple series or parallel configurations, then the circuit design is simple, but the voltage requirements cannot be matched flexibly and flicker occurs at low frequencies
Solution Approach 1:
The circuit is divided into multiple branches (first branch with first and second LEDs, second branch with third and fourth LEDs, and cross-connecting branch with fifth LED) that can be independently configured. This segmentation allows flexible voltage matching by selecting different branch combinations while maintaining manageable circuit complexity through modular design
Solution Approach 2:
The patent introduces a cross-connecting dimension by adding the fifth LED branch that connects between the first and second branches. This additional dimensional connection enables current flow during both positive and negative AC phases, providing voltage adaptability without significantly increasing overall circuit complexity
2Ease of manufacture
If AC-driven LED circuits use traditional configurations, then the implementation is straightforward, but flicker is produced at low frequencies (50/60 Hz)
Solution Approach 1:
The circuit ensures continuous light output by configuring multiple branches with opposite polarity connections. During positive AC phases, current flows through certain branches while during negative phases, current flows through other branches, ensuring that at least one branch is always active. This continuous operation eliminates flicker at low frequencies while maintaining straightforward AC-driven implementation
Solution Approach 2:
The patent utilizes the periodic nature of AC power by designing branches that activate during specific phases (positive or negative cycles). The cross-connecting fifth LED branch is specifically configured to conduct during both phases, creating a periodic action pattern that ensures continuous illumination without flicker while keeping the manufacturing process simple
3Illumination intensity
If LEDs are placed close together to increase light output, then more light is produced per component, but the separation distance becomes too small causing interference
Solution Approach 1:
The patent applies local quality by orienting LEDs in opposite directions (first and second LEDs facing one direction, third and fourth LEDs facing opposite direction). This local differentiation allows LEDs to be positioned in close proximity while their opposing orientations cause light beams to diverge, increasing overall illumination intensity without interference, maintaining appropriate effective separation despite physical closeness
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 and enhances light output per component, enabling easier design and scalability of lighting fixtures by ensuring consistent current draw across both AC phases and allowing for flexible configuration to meet various voltage requirements.
Implementation Method 1
an AC-driven LED circuit having a first parallel circuit having LEDs
Implementation Method 2
Transform Electrical Energy to Optical Energy
Data Source
AI summary
An LED lighting system is disclosed. In an example, an LED lighting system includes at least one lighting device, at least one driver, an LED circuit, and a switch. The driver has at least one bridge rectifier. The driver has a first voltage input from a mains power source and provides a second lower voltage output to the at least one lighting device. The LED circuit has two or more LEDs integrated in the at least one lighting device. The switch is integrated in the at least one lighting device and controllable by an end user. Additionally, the lighting device is configured to provide multiple brightness levels and/or color levels in response to control of the switch by the end user.