AC Current Source LED Illumination Device Uniform Current Distribution
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Solution Overview
Problem
In electronic devices using series assemblies of LEDs, uneven current flow due to different characteristics and impedances leads to non-uniform luminance, reduced LED lifespan, and potential device damage, with existing current balance technologies being complex, costly, and inefficient.
Innovation Solution
An illumination device utilizing an AC current source with current-sharing units, such as capacitors, and a closed-loop control system to ensure uniform current distribution across LED assemblies, along with a light modulation module for adjusting brightness, thereby addressing the uneven current flow and luminance issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If independent electrical energy units are utilized to drive series assemblies of LEDs, then current balance is improved, but circuit complexity and manufacturing cost increase
Solution Approach 1:
The patent merges multiple independent electrical energy units into a single AC current source that simultaneously drives multiple series LED assemblies. This consolidation maintains current balance across assemblies while reducing circuit complexity and manufacturing cost by eliminating the need for separate driving circuits for each assembly.
Solution Approach 2:
The AC current source is designed with multi-functional capability to serve multiple series LED assemblies concurrently. It provides universal current driving functionality across different LED assemblies with varying characteristics, achieving current balance without requiring assembly-specific electrical energy units.
2Reliability
If common mode choke coils are utilized to balance currents, then current sharing is improved, but manufacturing cost and device size increase
Solution Approach 1:
The patent extracts and eliminates the common mode choke coils from the circuit design. Instead of using these magnetic elements for current balance, the invention relies on the inherent characteristics of the AC current source and LED assemblies, thereby reducing device size and manufacturing cost while maintaining current sharing performance.
Solution Approach 2:
The patent replaces the mechanical/magnetic system (common mode choke coils) with an electrical system (AC current source with controlled current output). This substitution eliminates the need for physical magnetic elements, reducing device size while achieving the same current balancing function through electrical control.
3Reliability
If common mode choke coils are utilized for current balance, then current distribution is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the current balancing function into the AC current source design itself, eliminating the need for separate common mode choke coils. This integration reduces the number of components requiring procurement and assembly, thereby lowering manufacturing cost while maintaining effective current distribution across LED assemblies.
4Illumination intensity
If plural LEDs are coupled in series to increase luminance, then illumination intensity is improved, but current uniformity deteriorates
Solution Approach 1:
The patent implements feedback control within the AC current source to monitor and adjust the current flowing through each series LED assembly. This feedback mechanism compensates for variations in LED characteristics and impedance, maintaining uniform current distribution across all series assemblies while preserving the high luminance output achieved through series coupling.
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 achieves uniform current distribution across LED assemblies, extending their lifespan and allowing for effective modulation of illumination brightness, thus improving device performance and reducing manufacturing costs.
Implementation Method 1
The first current-sharing unit and the second current-sharing unit are capacitors
Data Source
AI summary
The present invention provides an illumination device, an illumination system, and a lamp. The illumination system includes the illumination device and a light modulation module. The illumination device includes a light emitting diode (LED) array, an alternating current (AC) current source, and an output power control module. The AC current source is electrically coupled to the LED array. The output power control module is electrically coupled to the LED array and the AC current source. The LED array, the AC current source, and the output power control module together form a closed-loop control loop. The light modulation module is electrically coupled to the closed-loop control loop for modulating illumination brightness of the LED.