LED Lighting Apparatus with Current Diodes for Brightness Uniformity
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Solution Overview
Problem
Light-emitting diode (LED) lighting apparatuses face challenges in achieving uniform brightness and improving power factor and efficiency, particularly when using alternating current (AC) power sources, as they often result in ripple voltage and inefficient power consumption.
Innovation Solution
The implementation of an AC voltage supply with a rectification unit and a constant current unit using current diodes to control and stabilize the current flowing through LED groups, ensuring uniform brightness and minimizing power consumption by adjusting current diodes and distribution resistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If AC voltage is supplied to light emitting diodes, then power consumption and power factor can be improved, but ripple voltage is generated causing non-uniform brightness
Solution Approach 1:
The light emitting diodes are divided into multiple groups, with each group controlled by an independent current diode. This segmentation allows each group to receive regulated current despite ripple voltage in the AC supply, ensuring uniform brightness across all groups while maintaining improved power consumption characteristics.
2Illumination intensity
If switching elements are used to control current to light emitting diodes, then uniform brightness can be achieved, but device complexity increases
Solution Approach 1:
The patent uses current diodes, which are simple passive components, instead of complex active switching elements. Current diodes provide sufficient current regulation for uniform brightness without requiring complex control circuits, thereby reducing device complexity while achieving the desired brightness uniformity.
3Illumination intensity
If multiple current paths are set for light emitting diodes, then brightness uniformity is secured, but manufacturing complexity increases
Solution Approach 1:
The patent employs identical current diodes for each light emitting diode group, creating a homogeneous circuit configuration. This approach simplifies manufacturing by using standardized components and repetitive circuit patterns, while still achieving brightness uniformity through the consistent current regulation provided by each current diode.
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 allows for uniform brightness across LED groups while improving power factor and efficiency, preventing overcurrent damage and optimizing power distribution, thereby enhancing the overall performance of LED lighting systems.
Implementation Method 1
a rectification unit rectifying the AC voltage
Implementation Method 2
a light-emitting unit receiving rectified voltage supplied from the rectification unit and performing light emitting operation through at least one light-emitting group
Data Source
AI summary
A lighting apparatus using light emitting diodes is disclosed. A plurality of light-emitting groups are connected to each other in series at an output terminal of a rectification unit. Current diodes as current sources are branched from a node between the light-emitting groups. Current values set in the current diodes are set according to the amount of current flowing into the light-emitting groups. Therethrough, the amount of current flowing in each light-emitting group can be determined.