LED Driving Device Current Distribution for AC Voltage Fluctuations
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Solution Overview
Problem
Lighting apparatuses powered by alternating current (AC) voltage face challenges in maintaining high efficiency and stable light emission due to fluctuations in AC voltage, leading to reduced LED utilization and light efficiency.
Innovation Solution
A device comprising a light-emitting diode (LED) array, a rectifier, an LED driver, and a current distributor that senses currents through LEDs and distributes driving currents based on input voltage thresholds, ensuring all LEDs emit light even during voltage fluctuations by adjusting the connection of current sources and switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple LED driving circuit is used without current distribution, then the device complexity is reduced, but the LED utilization decreases and light efficiency drops during voltage fluctuations
Solution Approach 1:
The LED array is divided into multiple groups (first LED group, second LED group, third LED group) that can be independently controlled through separate current paths. The current distributor segments the total LED driving current into multiple branch currents, allowing different LED groups to operate independently based on input voltage conditions, thereby maintaining high LED utilization without requiring complete circuit redesign.
Solution Approach 2:
The patent implements dynamic current distribution where the current distributor adjusts the allocation of current to different LED groups based on real-time input voltage conditions. Switches dynamically connect or disconnect current paths, and the current distributor dynamically adjusts branch current ratios, enabling the system to adapt to voltage fluctuations and maintain optimal LED utilization across varying operating conditions.
2Illumination intensity
If all LEDs are driven at high current to maximize light output, then the illumination intensity increases, but the energy consumption increases and efficiency decreases
Solution Approach 1:
Different LED groups are assigned different current levels based on their position in the circuit and local voltage conditions. The current distributor provides customized current allocation where some LED groups receive higher currents while others receive lower currents, optimizing the balance between light output and energy consumption for each local region of the LED array rather than applying a uniform current to all LEDs.
Solution Approach 2:
The system dynamically changes current parameters (magnitude and distribution) based on input voltage conditions. The current distributor adjusts branch current ratios in response to voltage fluctuations, and switches change connection states to modify current paths, thereby optimizing the energy-to-light-output ratio across different operating conditions without requiring fixed high current operation.
3Illumination intensity
If the LED driving current is increased to maintain light output during low voltage, then the power consumption increases, but if the current is reduced then the light output decreases
Solution Approach 1:
The system dynamically adjusts current distribution in real-time based on input voltage conditions. The current distributor continuously monitors and adjusts branch current allocations, while switches dynamically reconfigure current paths, enabling the system to maintain stable light output across different voltage conditions without wasting energy during high-voltage periods when full current is not needed.
Solution Approach 2:
The patent ensures continuous effective utilization of all LEDs across different voltage conditions by maintaining active current paths to all LED groups through dynamic switching and current distribution. Rather than allowing some LEDs to remain inactive during voltage fluctuations, the system continuously optimizes current allocation to keep all LEDs contributing to light output, eliminating energy waste from unused components while maintaining stable illumination.
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 achieves high LED utilization and light efficiency by ensuring all LEDs in the array emit light consistently, even when the AC voltage peaks fluctuate, thereby enhancing the overall performance of the lighting apparatus.
Implementation Method 1
a rectifier configured to supply an input voltage rectified from an AC voltage to the LED array
Implementation Method 2
a light-emitting diode (LED) array including a plurality of LEDs; an LED driver configured to drain an LED driving current from the LED array
Data Source
AI summary
A device may include a light-emitting diode (LED) array including a plurality of LEDs, a rectifier configured to supply an input voltage rectified from an AC voltage to the LED array, an LED driver configured to drain an LED driving current from the LED array, and a current distributor configured to sense a first current passing through at least one first LED from among the plurality of LEDs and supply a second current to at least one second LED from among the plurality of LEDs based on the first current.