LED Illumination Circuit Dynamic Serial-Parallel Switching
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Solution Overview
Problem
Conventional LED-based illuminating systems experience significant flashing due to high turn-on voltage requirements, which limits their turn-on time and efficiency.
Innovation Solution
An illuminating apparatus with a detecting unit and a controlling unit that adjusts the serial or parallel connection of LED modules based on input power state, allowing for adjustable turn-on voltage and extended turn-on time by switching between different connection configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a plurality of LEDs are serial-connected to improve brightness, then the turn-on voltage of the lighting set increases, but the turn-on time within the input power period decreases causing significant flashing
Solution Approach 1:
The patent applies dynamics by making the connection configuration between LED modules changeable rather than fixed. The switching unit dynamically reconfigures LED modules between serial and parallel connections based on the instantaneous voltage level of the input power, allowing the system to adapt to varying power conditions and extend effective illumination duration.
Solution Approach 2:
The patent segments the lighting system into multiple independently controllable LED modules, each with its own switching unit. This segmentation allows different modules to be configured in different connection modes (serial or parallel) based on power conditions, enabling the system to maintain brightness while extending turn-on time by activating modules in sequences that match the input power waveform.
2Illumination intensity
If a plurality of LEDs are serial-connected to improve brightness, then the turn-on voltage of the lighting set increases, but the adaptability to input power voltage variations decreases
Solution Approach 1:
The system dynamically adjusts the connection configuration of LED modules based on the detected voltage level of the input power. When voltage is high, modules are connected in serial to maximize brightness; when voltage is low, modules are reconfigured in parallel to ensure turn-on capability, thereby achieving high adaptability to varying input power conditions.
Solution Approach 2:
The patent changes the electrical parameters of the lighting system by altering the connection configuration (serial/parallel) of LED modules in response to input power voltage variations. This parameter change allows the system to maintain optimal performance across different voltage conditions, improving adaptability while preserving brightness where possible.
3Illumination intensity
If the turn-on voltage is increased to improve brightness, then the flashing effect becomes more significant, but the system complexity increases with adding detecting and controlling units
Solution Approach 1:
The patent implements feedback by using a detecting unit to monitor the voltage level of the input power and feed this information to controlling units that adjust the connection configuration of LED modules accordingly. This closed-loop feedback mechanism enables automatic adaptation to power conditions, reducing flashing without requiring complex manual control systems.
Solution Approach 2:
The system performs self-service by automatically detecting input power conditions and reconfiguring LED module connections without external intervention. The detecting and controlling units work autonomously to optimize the lighting output based on real-time power conditions, simplifying the overall control architecture while maintaining adaptability.
Data Source
AI summary
An illuminating apparatus adapted to receive an input power which is a pulse DC includes a lighting unit, a detecting unit and a controlling unit. The lighting unit includes a plurality of lighting sets and a switching unit. The switching unit may be used to cause the lighting sets interconnected in a serial fashion and/or in a parallel manner. The detecting unit detects a state of the input power. The control unit couples the detecting unit and the lighting unit, and controls the switching unit according to the detecting unit detecting the state of the input power. As such, the turn-on voltages of the lighting unit may adjust at different stages of the input power.