Multicolor LED Lighting Device Dynamic Current Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
PWM-controlled LED lamps face a trade-off between efficacy and flux output due to fixed current requirements at different color points, leading to compromised performance in multicolor LED lighting devices.
Innovation Solution
A method that adjusts the operating current amplitude of LED lighting devices based on designated color metric values, using a current profile to optimize efficacy and flux output without compromising between the two, by setting the current supplied to the LED light sources according to determined amplitudes, allowing for increased flux at certain color temperatures while maintaining optimal efficacy at others.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PWM control with fixed current is used for all color points, then color control capability is maximized, but a trade-off must be made between efficacy and flux output at different color temperatures
Solution Approach 1:
The patent implements dynamic current control where the current amplitude supplied to LED light sources varies based on the target color temperature. Instead of using a fixed current for all color points, the system adjusts the current amplitude dynamically according to the desired color metric value, allowing optimization of both efficacy and flux output at different operating points while maintaining full color control capability through PWM.
2Illumination intensity
If high current is supplied to achieve high flux output at certain color points, then flux output increases, but efficacy decreases
Solution Approach 1:
The patent changes the current amplitude parameter based on the target color metric value. For each desired color temperature, the system determines an optimal current amplitude from a stored current profile that maximizes efficacy while achieving the required flux output. This parameter adaptation allows the system to operate at optimal efficiency points across the entire color temperature range rather than being constrained by a single fixed current value.
3Use of energy by moving object
If low current is supplied to maintain optimal efficacy at certain color points, then efficacy is optimized, but flux output capability is reduced
Solution Approach 1:
The system dynamically adjusts current amplitude based on operational requirements. When high efficacy is the priority, lower current amplitudes are used; when high flux output is required, higher current amplitudes are supplied. The current profile stored in memory provides pre-determined optimal current values for different color temperatures, enabling the system to adapt to varying operational demands without compromising overall performance.
Data Source
AI summary
A method of controlling a multicolor LED lighting device is discloses. The LED lighting device comprises at least two series-connected LED light sources with different color metric values and supplied with a current, each LED light source is controlled by a respective switch operating according to a duty cycle. The method adapts an operating current amplitude supplied to the multicolor LED lighting device based on a color point that is required by a user. The method comprises the steps of receiving a designated color metric value for the LED lighting device; determining an operating current amplitude for the LED lighting device based on a current profile over a range of color metric values and the designated color metric value, and setting the current supplied to the LED light sources to the determined operating current amplitude.