Multi-Channel LED Power Supply With Flicker-Free Overload Protection
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Solution Overview
Problem
Existing LED power supply systems often face mismatches between LEDs and power units, leading to potential overloading and damage, especially when additional LEDs are connected, and there is a need for simple and fail-safe adjustments in brightness, color temperature, and intensity without noticeable flickering or color changes.
Innovation Solution
A DC voltage supply system with multiple power channels controlled by a microcontroller to maintain a color-determining excitation ratio, incorporating an overload protection circuit that rapidly alternates power to different color LEDs to prevent overloading, ensuring flicker-free operation and maintaining desired brightness and color temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional LEDs are connected to the power supply, then the lighting coverage and customization options are improved, but the risk of overloading and damage to the power supply and LEDs increases
Solution Approach 1:
The system continuously monitors the total current consumption of all connected LEDs and compares it against the maximum current capacity of the power supply. When the total current approaches the maximum limit, the control unit automatically adjusts the excitation ratios of individual color channels to reduce power consumption, preventing overload conditions while allowing flexible LED configuration
Solution Approach 2:
The excitation ratios for different color channels (red, green, blue, white) are dynamically adjusted based on real-time current measurements. The system can change the power distribution to each color channel on-the-fly, allowing the total power consumption to adapt to the connected LED load while maintaining desired color temperature and brightness characteristics
2Reliability
If power is supplied alternately to LEDs of different colors to prevent overloading, then the reliability is improved, but the visual perception of flickering or color changes may occur
Solution Approach 1:
The system uses pulse-width modulation (PWM) to supply power to different color channels in rapid alternating cycles. By operating at frequencies above the human visual perception threshold (typically >100Hz), the alternating power supply creates the perception of continuous, stable light output while actually implementing dynamic load management to prevent overheating and overload conditions
Solution Approach 2:
The control unit maintains continuous light output by rapidly switching between color channels within each PWM cycle. The human eye integrates these rapid transitions, perceiving continuous illumination even though individual LED groups are only active during specific portions of the cycle. This allows the system to distribute power alternately while maintaining visually stable lighting
3Illumination intensity
If the excitation power is increased to improve brightness, then the illumination intensity is improved, but the color temperature stability and energy efficiency may deteriorate
Solution Approach 1:
The system independently controls the excitation power for each color channel (red, green, blue, white) while maintaining a fixed excitation ratio that corresponds to the desired color temperature. When brightness needs to be increased, the system scales up power to all channels proportionally, preserving the color balance. The control unit monitors and adjusts these parameters in real-time to maintain both brightness and color temperature stability
4Temperature
If the excitation ratio is adjusted to change color temperature, then the color temperature is improved, but the brightness uniformity and energy consumption may worsen
Solution Approach 1:
The system applies different excitation power levels to different color channels based on their specific characteristics and the desired color temperature. Each color channel (red, green, blue, white) receives a customized excitation ratio that optimizes the overall color output. The control unit independently adjusts the power distribution to each channel while maintaining appropriate brightness levels through coordinated control of all channels
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
The system ensures optimal power supply to LEDs without noticeable flickering or color changes, preventing damage and energy savings by dynamically adjusting power distribution among channels, even with mismatched loads, and providing fail-safe protection against overloads.
Implementation Method 1
Light-emitting diodes are increasingly being used for lighting purposes
Implementation Method 2
White light is obtained by arranging and energizing light-emitting diodes of different colors
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
A DC LED power supply is described, comprising a plurality of power channels designed to supply power from the same power source to LEDs of different colors; a microcontroller designed to control power channels in such a way as to produce a color temperature according to a power channel excitation ratio; and an overload protection circuit.It is proposed that the overload protection circuit be designed to detect the total current supplied to the LEDs, the total power supplied to the LEDs, and/or the resistance of connected LEDs; and that the microcontroller be designed, in response to an insufficient total resistance, excessive current, and/or excessive total power, to control the power channels in such a way that power is supplied alternately to the LEDs of different colors while maintaining a color-determining excitation ratio, with the alternation between the power channels being so rapid that the alternation is not visually perceptible.