LED Driving Device AC Power Stabilization
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Solution Overview
Problem
Existing LED driving devices require AC-DC converters to operate LEDs with alternating current, which complicates the system and can lead to variations in light output due to changes in AC power voltage levels.
Innovation Solution
An LED driving device that includes a rectifier to convert AC power, an AC driver to control LED groups by adjusting current based on rectified power levels, and a light amount controller to regulate current flow, reducing variations in light output by managing current levels according to peak voltage changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an AC-DC converter is used to drive LEDs with AC power, then the system can operate with AC power, but the device complexity increases
Solution Approach 1:
The patent extracts and eliminates the AC-DC converter component from the LED driving system. Instead of converting AC to DC, the system directly drives LEDs using AC power after simple rectification, removing the complex conversion stage while maintaining AC power operation capability
Solution Approach 2:
The patent replaces the expensive and complex AC-DC converter with a simple, low-cost rectifier circuit that performs basic AC-to-pulsed-DC conversion sufficient for LED operation, sacrificing some conversion precision for significant simplicity and cost reduction
2Device complexity
If AC power is used directly without voltage regulation, then the device complexity is reduced, but the light output stability deteriorates due to voltage fluctuations
Solution Approach 1:
The patent implements a feedback mechanism where the controller detects the rectified voltage level and adjusts the LED driving current accordingly. When rectified voltage increases, the controller reduces current to maintain stable light output, and vice versa, creating a closed-loop control system that compensates for voltage fluctuations
Solution Approach 2:
The patent makes the LED driving current dynamic rather than fixed. The controller continuously adjusts the current level based on the detected rectified voltage, allowing the system to adapt to voltage changes while maintaining consistent light output, transforming a static system into a dynamic responsive one
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
Enables efficient operation of LEDs using AC power without an AC-DC converter, stabilizing light output by adjusting current levels in response to voltage fluctuations, thereby enhancing reliability and consistency.
Implementation Method 1
a rectifier configured to rectify alternating current (AC) power to generate rectified power
Data Source
AI summary
A light emitting diode (LED) driving device is provided. The LED driving device includes a rectifier configured to rectify alternating current (AC) power to generate rectified power; an AC driver configured to control operations of a plurality of LED groups so that the plurality of LED groups receive the rectified power generated by the rectifier; and a light amount controller configured to reduce an amount of current applied to the plurality of LED groups when a peak value of the rectified power is increased, and increase the amount of current applied to the plurality of LED groups when the peak value of the rectified power is reduced.