Lighting System Smooth Color Temperature Transition
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Solution Overview
Problem
Conventional LED lighting systems with controllable color temperature can be bothersome due to abrupt color-temperature variations before reaching the intended setting, causing discomfort to users.
Innovation Solution
A lighting system with a controlling device that operates in normal and transition modes, where the controlling device receives an electrical signal from mains electricity and generates a modified control signal by altering the waveform or frequency in response to a tuning signal, allowing smooth transition to the desired color temperature without flashing or degrading light intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the controller cyclically changes color temperature by repeatedly pressing the button, then the color temperature can be adjusted to the intended setting, but the abrupt color-temperature variations before reaching the intended setting cause user discomfort
Solution Approach 1:
The system dynamically switches between normal mode and transition mode based on operational state. In transition mode, the controller gradually adjusts the color temperature by modifying the PWM signal over time, rather than making abrupt changes. This dynamic adjustment allows smooth transition between color temperature settings, eliminating user discomfort from sudden variations while maintaining the ability to reach intended settings.
Solution Approach 2:
The controller uses periodic PWM signals to control LED output. In transition mode, the controller modifies the periodic signal's characteristics (duty cycle, frequency) to achieve gradual color temperature changes. The periodic action enables controlled, step-wise transitions that are perceptually smooth to users while systematically reaching the target color temperature.
2Object-affected harmful factors
If the controller enters transition mode to smooth color temperature changes, then user comfort is improved, but the system complexity increases due to mode switching and signal modification logic
Solution Approach 1:
The controller is designed to perform multiple functions within a unified structure. It handles both normal operation and transition modes using the same basic PWM generation and modification capabilities. The controller universally manages color temperature adjustment, mode switching, and signal generation without requiring separate dedicated circuits for each function, thereby limiting the increase in overall system complexity.
Solution Approach 2:
The controller achieves mode switching and color temperature adjustment by changing operational parameters (such as PWM duty cycle, frequency, or signal timing) rather than physically reconfiguring the circuit. This parameter-based control allows the same hardware to function in different modes with varying complexity levels, minimizing the actual hardware complexity increase while achieving smooth transitions.
Data Source
AI summary
A lighting system includes a controlling device and a lighting device. The controlling device is configured to receive an electrical signal from mains electricity, enter a transition mode upon receiving a tuning signal, and enter a normal mode after a predetermined period of time has elapsed since a latest receipt of the tuning signal. The controlling device is further configured, in the normal mode, to continuously output the electrical signal as a control signal to the lighting device, and in the transition mode, continuously output a modified signal as the control signal to the lighting device.