LED Lighting Apparatus with Phase-Shifted Units for Harmonic Reduction
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Solution Overview
Problem
Current AC direct-type lighting apparatuses face issues with current harmonic, leading to reduced power efficiency due to non-linear driving methods, which are not effectively addressed by existing technologies.
Innovation Solution
The proposed solution involves a lighting apparatus with multiple LED groups and corresponding driving circuits that regulate currents in response to rectified voltage changes, allowing for sequential light emission and differing light emitting points within the same light emitting sequence, thereby reducing current harmonic through controlled current paths and phase management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If AC direct-type lighting apparatus uses non-linear driving method, then power factor is satisfactory, but current harmonic increases and power efficiency decreases
Solution Approach 1:
The patent divides the LED lighting system into multiple independent lighting units, each with its own driving circuit. Each unit processes a portion of the rectified voltage waveform independently, allowing the total current draw to be segmented across multiple phases. This segmentation reduces the harmonic content of the overall current waveform while maintaining the AC-direct driving approach.
Solution Approach 2:
The patent employs periodic switching of multiple lighting units in response to the rectified voltage waveform. Each lighting unit is activated at different phases of the AC cycle, creating a periodic distribution of current draw that smooths out harmonic peaks. The driving circuits switch LED groups on and off periodically according to voltage thresholds, achieving harmonic reduction through time-based distribution.
2Use of energy by moving object
If LED is driven by current with additional circuits, then light emission efficiency is high, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple driving circuits into a unified AC-direct driving architecture. Instead of using separate current regulation circuits for each LED, the system combines the driving functions across multiple lighting units that share the same rectified voltage source. This merging reduces overall circuit complexity while maintaining efficient current-driven LED operation.
Solution Approach 2:
The lighting units automatically regulate their own current draw based on the rectified voltage waveform without requiring external current control circuits. Each unit responds autonomously to voltage thresholds, turning LED groups on and off as needed. This self-service approach eliminates the need for complex external current regulation while maintaining high light emission efficiency.
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 configuration reduces current harmonic and improves power efficiency by managing current changes in a stepped waveform, enhancing the overall performance of the lighting apparatus.
Implementation Method 1
The lighting apparatus is configured to convert an AC voltage into a rectified voltage
Implementation Method 2
a light source having high light emission efficiency based on a small amount of energy. Representative examples of a light source used in the lighting apparatus may include an LED
Data Source
AI summary
Provided is a lighting apparatus. The lighting apparatus may include two or more lighting units each including a plurality of LED groups which sequentially emit light in response to changes of a rectified voltage. The two or more lighting units may include one or more LED groups having the same light emitting sequence but having different light emitting points of time. Thus, current harmonic can be reduced, and power efficiency can be improved.