LED Fade Control Using Dynamic Interval Time Adjustment
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Solution Overview
Problem
Conventional lighting devices require significant memory capacity to produce various fade operations, as multiple maps need to be prepared for each variation, leading to inefficient memory usage.
Innovation Solution
A lighting device with a first recording part for a map indicating brightness and change in brightness at multiple steps, a set part for setting interval times, and a control part that adjusts interval times before and after reaching a change brightness, allowing for various fade operations without excessive memory consumption, including a master and slave device configuration for communication and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple maps are prepared for each fade operation variation, then various fade operations can be produced, but memory capacity is consumed significantly
Solution Approach 1:
The patent segments the fade operation parameters into two parts: a base map containing brightness values for multiple steps, and separate parameter sets containing only the interval time variations. This segmentation allows the system to generate multiple fade operations by combining the single base map with different parameter sets, significantly reducing memory requirements compared to storing complete separate maps for each variation.
Solution Approach 2:
The base map serves as a universal resource that can be reused across multiple fade operation variations. By making the brightness step values universal and only varying the interval time parameters, the system achieves multiple fade operations from a single shared data structure, reducing overall memory consumption while maintaining versatility.
2Quantity of substance
If a single map is used for all fade operations, then memory capacity is reduced, but the ability to produce various fade operations is limited
Solution Approach 1:
The system dynamically adjusts the interval time parameter based on the current step and predefined conditions. The set part dynamically changes the interval time from a first interval time to a second interval time during the fade operation, allowing a single map to produce varied fade operations through dynamic parameter adjustment rather than requiring separate static maps for each variation.
Solution Approach 2:
The patent changes the interval time parameter during the fade operation to create different fade variations. By modifying this single parameter (interval time) while keeping the base brightness map unchanged, the system generates multiple fade operation types without requiring multiple complete maps, thus resolving the contradiction between memory usage and operational versatility.
Data Source
AI summary
A lighting device which can produce various fade operations without significantly consuming memory capacity is provided. Duty ratios for a plurality of steps are recorded in a ROM of a slave ECU. The slave ECU sets an interval time for 1 step, reads out from a map brightness of a next step at each set interval time, and outputs a pulse with the read out duty ratio to a LED. A change duty ratio, a pre-change interval time and a post-change interval time are recorded in the ROM. The slave ECU sets the interval time for 1 step to the pre-change interval time before the duty ratio of the LED reaches to the change duty ratio, and changes the setting by setting the interval time for 1 step to the post-change interval time after the duty ratio of the LED has reached to the change duty ratio.