AC-Driven LED Circuit with Cross-Connected Branches
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Solution Overview
Problem
Existing AC-driven LED lighting fixtures face challenges in matching voltage requirements and suffer from objectionable flicker, particularly at low frequencies like 50/60 Hz, which affects lighting design and efficiency.
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 AC phases, reducing flicker and allowing for easier matching of voltage requirements by configuring LEDs in opposing series relationships and connecting them in series or parallel to achieve desired performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If LEDs are connected in simple series or parallel configurations, then voltage matching is simplified, but flicker occurs at low AC frequencies (50/60 Hz)
Solution Approach 1:
The circuit is divided into multiple parallel branches, each containing series-connected LEDs. This segmentation allows the circuit to maintain continuous current flow during both AC phases while simplifying voltage matching through modular configuration.
Solution Approach 2:
Cross-connecting circuit branches are introduced as intermediary pathways that enable current to flow through alternative routes during AC phase transitions. This eliminates interruptions in LED current flow that cause flicker, while maintaining compatibility with standard AC frequencies.
2Object-affected harmful factors
If cross-connecting branches are added to eliminate flicker, then flicker is reduced, but circuit complexity increases
Solution Approach 1:
The circuit is organized into modular parallel branches with standardized cross-connecting patterns. This segmentation approach manages complexity by creating repeatable units that can be scaled without proportionally increasing overall circuit complexity.
Solution Approach 2:
The cross-connecting branches serve multiple functions: they provide alternative current paths during AC phase transitions, maintain continuous LED operation, and enable scalability. This multi-functionality justifies the added complexity by delivering multiple benefits from the same structural elements.
3Illumination intensity
If more LEDs are added to increase light output, then illumination intensity increases, but voltage and current matching becomes more difficult
Solution Approach 1:
Additional LEDs are incorporated by adding more parallel branches to the circuit rather than increasing series connections. This segmentation strategy increases light output while maintaining manageable voltage and current characteristics through modular expansion.
Solution Approach 2:
The circuit scales by expanding in the dimensional space of parallel branches rather than increasing series complexity. This approach allows light output to increase through added parallel pathways while maintaining relatively simple voltage matching characteristics.
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, allowing for more flexible and efficient design of lighting fixtures by ensuring consistent current draw during both AC phases and accommodating various voltage requirements through modular scalability.
Implementation Method 1
light-emitting diode ("LED") circuits and assemblies
Data Source
AI summary
An AC-driven LED assembly with discretely packaged LEDs being connected in an AC circuit and being sized preferably substantially 2.5 mm or less in length and width, and more preferably 2.0 mm or less; and being mounted to a substrate at a distance from the other of preferably approximately 3 mm or less, and more preferably 2.0 mm or less.