AC LED Circuit Layout for Scalable Fixed-Output Lighting
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Solution Overview
Problem
Existing LED lighting systems face inefficiencies when driven by AC power, requiring complex and bulky transformers or rectifiers, and lack scalability in adding or removing LED circuits without affecting light output or requiring component adjustments.
Innovation Solution
The use of opposing parallel LED configurations with integrated capacitors and resistors allows for AC-driven LED circuits to maintain a fixed voltage and frequency output, enabling scalable and efficient lighting systems without the need for additional components or adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex transformers or rectifiers are used to drive LEDs with AC power, then the LED can be driven by AC power, but the device complexity and size increase
Solution Approach 1:
The patent extracts the AC-to-DC conversion function from separate external transformers or rectifiers and integrates it directly into the LED package itself. The LED package includes a capacitor connected in series with the LED, which enables direct AC driving without external conversion components, thereby reducing device complexity while maintaining AC power compatibility
Solution Approach 2:
The patent merges the LED light-emitting function with the AC power handling function into a single integrated package. The capacitor and LED are combined within the same package, eliminating the need for separate transformers or rectifiers and reducing overall system complexity
2Productivity
If traditional LED lighting systems are used, then the system can provide light output, but scalability is limited when adding or removing LED circuits
Solution Approach 1:
The patent divides the lighting system into independent, modular LED packages, each capable of operating directly from AC power. Each package contains an LED and a series capacitor that together form a self-contained unit. This segmentation allows individual packages to be added or removed from parallel circuits without affecting other packages, enabling easy scalability while maintaining consistent light output
Solution Approach 2:
The patent creates universal LED packages that can be used in various configurations (series or parallel) and can be added or removed without requiring system reconfiguration. The standardized package design with integrated AC handling capability makes it versatile for different lighting applications and scalable system designs
3Device complexity
If AC-driven LED circuits are designed without integrated capacitors, then the circuit is simpler, but voltage and frequency output cannot be maintained fixed
Solution Approach 1:
The patent combines the capacitor with the LED in a single integrated package, creating a unified component that provides both light emission and voltage/frequency stabilization. This merging maintains circuit simplicity from an external perspective while achieving stable operation internally through the integrated capacitor
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
This approach enables efficient, scalable, and standardized LED lighting systems that can add or remove LED circuits without altering light output, using high-frequency inverters to maintain consistent performance and reduce component size.
Implementation Method 1
A capacitor is connected in series to a diode string having a first diode and a second diode connected in series, the capacitor being capable of limiting current flow to the first diode and the second diode
Implementation Method 2
A first LED circuit and a second LED circuit are connected in parallel, each LED circuit comprising at least one series connected diode string having at least two diodes in series and a capacitor connected in series to the at least one series connected diode string, the first LED circuit and the second LED circuit being capable of drawing current during both the positive and negative phase of the AC power source
Data Source
AI summary
A lighting device is disclosed. The example lighting device includes a printed circuit board. First and second LED circuits are mounted on the printed circuit board. The first LED circuit is configured to emit a first color temperature of white light when receiving power from a driver circuit and the second LED circuit is configured to emit a second color temperature of white light when receiving the power from the driver circuit. The second color temperature of white light emitted from the second LED circuit is different than the first color temperature of white light emitted from the first LED circuit.