LED Lighting Device with Switchable Shorting Links
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
LED lights face challenges when operated with alternating voltage supplies due to a narrow working voltage window, leading to potential failure from excessive current flow or insufficient illumination, making direct connection to alternating voltage supplies impractical.
Innovation Solution
The LED lighting device employs a series connection of LED part groups with switchable shorting links and a control means to adjust the through voltage, allowing flexible operation within an acceptable voltage range, preventing overheating and optimizing energy efficiency by selectively activating or deactivating LEDs based on supply voltage amplitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If LEDs are connected directly to alternating voltage supply, then the device complexity is reduced, but the reliability deteriorates due to narrow working voltage window and risk of excessive current flow
Solution Approach 1:
The LED chain is divided into multiple LED part groups that can be independently switched on or off. Each LED part group contains a specific number of LEDs arranged in series, allowing the total voltage requirement to be segmented into discrete steps. This segmentation enables the system to adapt to different voltage amplitudes by activating only the necessary number of LED part groups, thereby preventing excessive current flow while maintaining reliability.
Solution Approach 2:
The invention implements dynamic switching of LED part groups based on the instantaneous amplitude of the alternating voltage supply. The control means continuously monitors the voltage amplitude and dynamically adjusts which LED part groups are active, switching between different configurations to match the varying voltage conditions. This dynamic adaptation ensures that LEDs always operate within their safe current range regardless of voltage fluctuations.
2Power
If the number of LED part groups in series is increased, then the through voltage increases to match higher supply voltages, but the risk of overheating and failure increases if voltage exceeds the working window
Solution Approach 1:
The system dynamically adjusts the number of active LED part groups in series based on the instantaneous voltage amplitude. When voltage amplitude is high, more LED part groups are activated to increase the through voltage and utilize the available power. When voltage amplitude drops, fewer LED part groups remain active to prevent the voltage from exceeding the working window and causing overheating. This dynamic adjustment maintains reliability while optimizing power utilization.
Solution Approach 2:
The control means employs feedback from voltage amplitude detection to regulate the switching state of LED part groups. The system continuously monitors the supply voltage amplitude and uses this feedback information to determine which LED part groups should be active, ensuring that the total through voltage remains within the safe operating range of the LEDs while maximizing power utilization.
3Adaptability or versatility
If LED part groups are switched consecutively based on voltage amplitude, then the operating range is expanded, but the lighting uniformity may deteriorate during transitions
Solution Approach 1:
The LED chain is segmented into multiple part groups that can be independently controlled. By dividing the total number of LEDs into discrete, manageable segments, the system can switch between different combinations of these segments to adapt to various voltage amplitudes. This segmentation allows for gradual transitions between different operating states, maintaining lighting uniformity while expanding the operating range.
4Adaptability or versatility
If shorting links are used to bridge LED part groups, then the flexibility in voltage adjustment is improved, but the device complexity increases due to additional switching components
Solution Approach 1:
The LED chain is divided into discrete LED part groups, each with its own shorting link. This segmentation allows for independent control of each group through its associated shorting link, providing flexible voltage adjustment capability. The modular structure enables the system to adapt to different voltage requirements by selectively activating or bypassing specific LED part groups.
Solution Approach 2:
The shorting links serve multiple functions: they act as switching elements for voltage adjustment, provide protection pathways for current diversion, and enable flexible configuration of the LED chain. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in device complexity while maintaining high adaptability.
Data Source
AI summary
An LED lighting device for AC voltage supply is provided. The device has LEDs that are divided into multiple LED part groups. A supply voltage is provided to the device. The LED part groups provides a plurality of LED strands each formed by a certain number of LED part groups arranged in series with each other. The device has shorting links each for bridging one of the LED part groups in an LED strand. The device also has a control means for controlling the shorting links to place the LED strands in at least two switch states. The through voltages of the LED strands are different, when the LED strands are in the switch states, respectively.