LED Lighting Apparatus Reducing THD via Segmented Drivers
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Solution Overview
Problem
Lighting apparatus using LEDs face high total harmonic distortion (THD) due to nonlinear current changes, which affects power efficiency and heat management.
Innovation Solution
The solution involves dividing LEDs into groups and using multiple drivers with sensing resistors to provide multiple current paths, increasing the number of emission and current change steps, thereby buffering nonlinear current changes and distributing heat effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single driver is used to control LED groups, then device complexity is reduced, but total harmonic distortion (THD) increases due to nonlinear current changes
Solution Approach 1:
The patent divides the LED groups into multiple sets, with each set controlled by a separate driver. This segmentation allows each driver to handle a portion of the total current regulation, reducing the nonlinear current changes and THD while maintaining manageable device complexity through modular architecture.
2Loss of energy
If multiple drivers are used to reduce THD, then power efficiency improves, but device complexity increases
Solution Approach 1:
The patent segments the LED lighting system into multiple groups, each driven by a separate driver circuit. This allows the total current to be divided into multiple smaller current paths, reducing nonlinear effects and improving power efficiency while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent employs multiple drivers with identical or similar circuit configurations, where each driver performs the same current regulation function for its assigned LED group. This universal approach simplifies design and maintenance while achieving reduced THD through parallel operation.
3Productivity
If LED groups are increased beyond one driver's capacity, then lighting coverage is improved, but heat generation in each driver increases
Solution Approach 1:
The patent divides a large number of LED groups into multiple subsets, with each subset controlled by a separate driver. This segmentation distributes the total current load across multiple drivers, reducing the heat generation in each individual driver while maintaining comprehensive lighting coverage.
Solution Approach 2:
The patent combines multiple drivers operating in parallel to collectively control a large number of LED groups. This merging approach allows the system to handle increased lighting coverage requirements while each driver operates within manageable thermal limits.
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 reduces THD, improves power efficiency, and manages heat generation by allowing multiple drivers to handle increased LED groups without dedicated designs, enhancing overall performance.
Implementation Method 1
a first sensing resistor connected to the first current path; a second sensing resistor connected between the second current path and the first sensing resistor
Data Source
AI summary
Disclosed is a lighting apparatus for reducing total harmonic distortion (THD). The lighting apparatus may include a lighting unit having a plurality of LED groups divided into first and second lighting groups, and the lighting unit may provide a current path for light emission corresponding to a change of a rectified voltage, using two or more drives having the same structure.