Phase-Offset LED Driver for Pulse Loading Reduction
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Solution Overview
Problem
Existing systems for periodically emitting mixed light colors from primary color light sources experience extreme pulse loading on power supply units, leading to high energy storage demands and physiological disruptions such as color separation and stroboscopic effects due to simultaneous switching of light sources.
Innovation Solution
Implementing a phase-offset activation of primary color light sources within each period, with varying leading and trailing edges, and simultaneous activation of all sources with individually predetermined duty factors to reduce energy storage needs and mitigate physiological disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If three primary color light sources are switched on simultaneously at the beginning of each period, then the color mixing is achieved, but extreme pulse loading occurs on the power supply unit
Solution Approach 1:
The patent applies periodic action by distributing the activation of three primary color light sources across different phases within each period. Instead of simultaneous switching, each light source is activated in sequence with phase offsets, transforming the single extreme pulse into multiple distributed pulses while maintaining the overall periodic illumination cycle
Solution Approach 2:
The patent segments the simultaneous activation event into three separate activation events occurring at different phases. Each primary color light source is activated independently with its own phase offset, dividing the concentrated power demand into distributed temporal segments that reduce peak loading on the power supply
2Illumination intensity
If simultaneously switching on three light sources is implemented, then mixed light color is achieved, but space-consuming and heavy energy storage components are required
Solution Approach 1:
The periodic distribution of light source activation reduces the instantaneous energy demand, allowing smaller energy storage components to suffice. By spreading activation across phases, the system requires less peak power buffering capacity, reducing the size and weight of necessary energy storage elements
Solution Approach 2:
The phase-offset activation schedule serves as a preliminary planning approach that anticipates and distributes power demands before they occur. By pre-planning the sequential activation sequence, the system avoids the need for large emergency energy buffers that would be required for simultaneous activation
3Power
If primary colors are switched on successively without temporal overlaps, then power loading is reduced, but color separation effect and stroboscopic effects occur
Solution Approach 1:
The patent applies dynamics by introducing adjustable phase offsets that can be optimized to balance power distribution against visual quality. The phase relationships between light source activations are made dynamic and可调, allowing the system to adapt the timing to minimize both power peaks and visual artifacts like color separation and stroboscopic effects
Solution Approach 2:
The patent changes the temporal parameters of light source activation by introducing phase offsets between different primary color sources. This parameter adjustment transforms the activation pattern from simultaneous or completely sequential to a distributed phase-offset sequence, optimizing both power loading and visual perception
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 approach reduces electrical losses and thermal loads while minimizing disruptive color separation effects, allowing for a stable and less irritating multicolored illumination with reduced energy buffering requirements.
Implementation Method 1
Light sources such as lasers, electroluminescence elements, organic LEDs or in particular semiconductor light-emitting diodes are preferably used
Implementation Method 2
their color emissions are additively mixed
Implementation Method 3
the available energy must therefore be buffer-stored by means of space-consuming and comparatively heavy and expensive stores, in particular electrolyte capacitors
Implementation Method 4
Brightnesses are approximately linearly dependent on the duty factor of the feed with pulse-width-modulated constant current pulses
Data Source
AI summary
In order to avoid firstly decidedly periodic loading of an output-buffered constant current power supply unit (17) and secondly physiological loading as a result of only intermittently appearing primary colors (R, G, B) when activating mixed light color loci, primary color light sources (11R, 11G, 11B) are energized in pulse-width-modulated fashion periodically in a temporally offset manner, but in addition in each instance, in time-parallel fashion with respect thereto, also those primary color light sources of further primary color light sources (11R, 11G, 11B) whose primary colors in the cyclic activation are not being energized at that time are likewise energized in a pulse-width-modulated manner (FIG. 2). If, in addition, white light light sources (11W) are intended to be used, they are expediently in each case energized simultaneously with one of the primary color light sources (11R, 11G, 11B) and the other two of these primary color light sources, on the other hand, are energized in a temporally offset manner simultaneously in pairs.