LED Lighting Device Hardware Software Cooperative Control
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Solution Overview
Problem
Conventional LED lighting devices experience reduced light emitting efficiency when switching lighting modes due to uneven power distribution among high and low color temperature LEDs, leading to decreased performance when all LEDs are used simultaneously.
Innovation Solution
An adjustable color-temperature LED lighting device employs a hardware current switching unit to adjust power output and a microcontroller with PWM technology to maintain constant power, ensuring efficient light emission by switching resistance and modulating pulse width based on the number of active LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If all LEDs share the electric energy outputted by the LED drive circuit to output mixed light at full brightness, then the lighting device can provide adjustable color temperature, but each LED receives only a quarter of total power causing reduced light emitting efficiency
Solution Approach 1:
The patent segments the power distribution by providing separate drive circuits for high color temperature LEDs and low color temperature LEDs. Each drive circuit independently controls its associated LEDs, allowing optimized power allocation rather than forced equal sharing. This enables each LED group to receive appropriate power levels for maximum efficiency while maintaining color temperature adjustability through independent dimming control.
Solution Approach 2:
The patent implements dynamic power allocation where the drive circuits can adjust power distribution in real-time based on operational requirements. The system transitions from static equal power sharing to dynamic power allocation, allowing each LED group to receive optimized power levels depending on the desired color temperature output, thereby maintaining high light emitting efficiency across different operating modes.
2Ease of operation
If a single LED receives total power for monochromic full-brightness lighting, then the lighting mode can be simplified, but the light emitting efficiency decreases due to the physical property of LED where larger power results in smaller efficiency
Solution Approach 1:
The patent segments the LED array into multiple independently controllable groups with separate drive circuits. This allows the system to operate in simplified monochromic modes by activating only one LED group while maintaining high efficiency, as each group can be optimized for its specific wavelength and power requirements rather than forcing a single LED to handle excessive power.
3Device complexity
If conventional LED lighting devices use shared power distribution among multiple LEDs, then the device structure can be simplified, but the working efficiency fails to meet user requirements when power increases
Solution Approach 1:
The patent divides the power distribution system into separate drive circuits for different LED groups, enabling independent optimization of each group's working efficiency. While this increases device complexity compared to shared power distribution, it resolves the efficiency problem by allowing each LED group to operate at optimal power levels rather than being constrained by equal power sharing.
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 solution maintains constant power to the LEDs, enhancing light output efficiency and overall product quality by optimizing power distribution and reducing power attenuation during color temperature adjustments.
Implementation Method 1
the hardware current switching unit switches the resistance of the secondary power output unit to output four times of the maximum drive power to the corresponding first-wavelength LED, second-wavelength LED, third-wavelength LED or fourth-wavelength LED
Implementation Method 2
the constant power programming unit modulates the pulse width of the output power to maintain the carrying power of the light source to be a constant rated power
Implementation Method 3
The light source includes a first-wavelength LED, a second-wavelength LED, a third-wavelength LED and a fourth-wavelength LED
Data Source
AI summary
An LED lighting device capable of adjusting color temperature by software and hardware cooperative control to achieve high-performance output includes at least one light source and a drive circuit. The light source includes first-wavelength LED, second-wavelength LED, third-wavelength LED and fourth-wavelength LED. When a modulator is operated to select only one of the first-wavelength LED, the second-wavelength LED, the third-wavelength LED and the fourth-wavelength LED to receive a maximum rated current, the drive circuit outputs four times of the maximum drive power to the corresponding LEDs; or when the first-wavelength LED, the second-wavelength LED, the third-wavelength LED and the fourth-wavelength LED receive a quarter of the maximum rated current separately, the drive circuit outputs a quarter of the maximum drive power to the LEDs separately, and the output pulse width of the drive power will be modulated to maintain the light source to carry a constant rated power.