LED Driving Apparatus with Current Source Unit for Stress Distribution
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Solution Overview
Problem
Existing LED driving systems face challenges in distributing current stress evenly across LEDs when converting AC power to DC, leading to potential reduction in lifespan and power factor issues due to varying voltage magnitudes and excessive current stress.
Innovation Solution
An apparatus that connects LED units in parallel with a termination end of one unit connected to the middle of an adjacent unit, using multiple current sources to distribute current flow based on voltage levels, allowing for controlled current switching and reduced stress across LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If LED units are connected in parallel to rectified power, then the circuit is simple and power consumption is low, but current stress is excessively applied to specific LEDs due to varying voltage magnitude
Solution Approach 1:
The patent divides the parallel LED units into multiple groups, where each group contains several LED units connected in parallel. This segmentation allows the current stress to be distributed across multiple groups rather than concentrating on specific individual LEDs, thereby improving reliability while maintaining circuit simplicity.
Solution Approach 2:
The patent introduces a current source unit as an intermediary component between the rectified power input terminal and the LED groups. This current source unit actively distributes the current stress evenly across the LED groups based on voltage levels, preventing excessive current concentration on specific LEDs and extending their lifespan.
2Device complexity
If a simple rectifier is used, then the circuit is simple, but voltage magnitude varies in sine wave manner causing excessive current stress on specific LEDs
Solution Approach 1:
The patent employs a current source unit that provides feedback control based on the voltage level of the rectified power. The current source unit adjusts the current distribution to LED groups according to the instantaneous voltage magnitude, ensuring even current stress distribution throughout the sine wave cycle and preventing excessive stress on specific LEDs.
Solution Approach 2:
The patent changes the parameter of current distribution by introducing a controllable current source unit that adjusts current allocation based on voltage level. This dynamic parameter adjustment ensures that current stress is evenly distributed across LED groups regardless of the sine wave voltage magnitude at any given moment.
3Use of energy by moving object
If LED units are connected in parallel, then power consumption is reduced, but current stress distribution is uneven reducing overall system efficiency
Solution Approach 1:
The patent introduces a dynamic current distribution mechanism through the current source unit that actively adjusts current allocation based on real-time voltage levels. This dynamic control ensures that current stress is evenly distributed across LED groups, maximizing system efficiency while maintaining low power consumption characteristics of parallel connections.
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 solution effectively distributes current stress across LEDs, reducing the intensity of stress on individual LEDs and improving the overall efficiency and lifespan of the LED driving system by managing current flow according to voltage levels.
Implementation Method 1
a current source unit including a plurality of current sources respectively connected to termination ends of the plurality of LED units and allowing corresponding current to flow through the plurality of LED units
Data Source
AI summary
There is provided an apparatus for driving a light emitting diode (LED), capable of distributing current stress applied to the LED. The apparatus includes an LED part including a plurality of LED units respectively including at least one LED, the plurality of LED units being connected in parallel to a power input terminal to which rectified power in sine wave form is supplied, and, among the plurality of LED units connected in parallel, a termination end of the LED unit in a front end being connected to a middle of an adjacent LED unit; and a current source unit including a plurality of current sources respectively connected to termination ends of the plurality of LED units and allowing corresponding current to flow through the plurality of LED units.