LED Control Circuit Dynamic Duty Cycle Adjustment
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Solution Overview
Problem
Existing LED control methods are limited in dynamically varying the duty cycle for fading effects, requiring pre-stored patterns and resource-intensive changes, restricting the ability to easily adjust fading parameters.
Innovation Solution
A light-emitting diode control circuit and method that dynamically adjusts the duty cycle using a small number of digital parameters, generating a pulse-width modulation signal to control the LED's intensity by selecting duration values and intensity levels, allowing for flexible fading patterns without the need for extensive memory loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pre-stored fading patterns are used in memory, then fading effects can be achieved, but system resources are consumed and flexibility is reduced
Solution Approach 1:
The patent changes the approach from storing complete fading patterns to storing only key parameters (start intensity, end intensity, duration). The fading pattern is then generated dynamically by processing these parameters through mathematical functions, allowing unlimited fading variations without additional memory resources.
Solution Approach 2:
Instead of storing actual fading patterns in memory, the patent creates a mathematical model that copies the essential characteristics of fading patterns through parameter definitions. This allows the system to generate patterns on-demand without physical storage of pattern data.
2Ease of operation
If complete fading patterns are loaded into control registers, then fading control is achieved, but time and system resources are consumed
Solution Approach 1:
The patent extracts only the essential parameters needed to define a fading pattern (start intensity, end intensity, duration) from the complete pattern data. By storing only these critical parameters in control registers, the system eliminates the time-consuming process of loading entire fading patterns while maintaining full fading control capability.
Solution Approach 2:
The patent transforms the control approach from storing complete temporal patterns to storing simplified parameter sets. This parameter-based approach allows the system to generate fading patterns dynamically, eliminating the time required to load pre-computed pattern data into control registers.
3Device complexity
If LED duty cycle is fixed, then simple control is achieved, but intensity variation capability is limited
Solution Approach 1:
The patent introduces dynamic duty cycle adjustment by processing stored parameters through mathematical functions that generate time-varying duty cycle values. This allows the LED intensity to change dynamically over time according to the processed parameters, maintaining simple control circuitry while achieving versatile intensity control.
Solution Approach 2:
The patent creates a universal control mechanism where the same control circuit and parameter storage can generate multiple different fading patterns by varying the input parameters. This multi-functional approach allows a single simple circuit to provide diverse intensity variation capabilities without requiring separate control paths for each pattern type.
Data Source
AI summary
A light-emitting diode control circuit is provided, that includes: a duration selection circuit for selecting one of a first duration value, a second duration value, a third duration value, or a fourth duration value as a selected duration value based on a selection signal; a control clock generator for generating a control clock signal based on a slow clock signal and the selected duration value; a selection signal generator for generating the selection signal based on the control clock signal; an intensity signal generator for generating a current intensity signal based on a first intensity value, a second intensity value, the control clock signal, and the selection signal; a reference wave generator for generating a reference wave based on a fast clock signal; and a comparator for comparing the current intensity signal and the reference wave to generate a pulse width modulation signal to control the light-emitting diode.