Parallel LED String Layout for Low-Loss Multi-Wavelength Lighting
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Solution Overview
Problem
Existing light sources face challenges in reducing power consumption due to the significant voltage differences between different types of light-emitting elements, leading to inefficiencies in power supply management.
Innovation Solution
A light source configuration with parallel-connected first and second light-emitting units, where the second unit has a lower forward voltage and more elements in series, is designed to minimize the voltage difference and power loss by controlling duty cycles and current values, using a common power supply and driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If light-emitting elements with different forward voltages are connected in series to a common power supply, then the circuit can operate with a single power supply, but the voltage difference causes power loss and reduces energy efficiency
Solution Approach 1:
The light-emitting elements are divided into two separate parallel groups: a first group containing elements with a first forward voltage, and a second group containing elements with a second forward voltage. Each group is connected in parallel to the common power supply, allowing independent voltage matching and reduced power loss while maintaining a single power supply configuration.
2Loss of energy
If multiple light-emitting elements with different forward voltages are connected in parallel to a common power supply, then power loss is reduced, but the circuit complexity and control difficulty increase
Solution Approach 1:
Each parallel group is assigned a specific characteristic (first forward voltage or second forward voltage) that matches the local requirements of the light-emitting elements within that group. This localized optimization allows each group to operate at its optimal voltage level, reducing overall power loss while maintaining manageable circuit complexity through clear segmentation.
3Illumination intensity
If light-emitting elements operate at high current to achieve desired brightness, then illumination intensity increases, but the risk of element failure due to excessive current increases
Solution Approach 1:
The circuit configuration changes the operating parameters of the light-emitting elements by providing voltage-matched parallel groups. This allows elements to operate at lower, safer current levels while achieving the desired brightness through optimized voltage application, thereby reducing the risk of failure due to excessive current.
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 configuration reduces power consumption by minimizing voltage differences between light-emitting units, thereby optimizing energy efficiency and reducing the risk of element failure due to excessive current.
Implementation Method 1
a first light-emitting unit disposed on the substrate and including one first light-emitting element or a plurality of first light-emitting elements connected in series; a second light-emitting unit disposed on the substrate and including a plurality of second light-emitting elements connected in series
Implementation Method 2
one or more drivers configured to cause the one or plurality of first light-emitting elements and the plurality of second light-emitting elements to emit light of predetermined brightnesses
Data Source
AI summary
A light source includes a first light-emitting unit including one or more first light-emitting elements connected in series, a second light-emitting unit including second light-emitting elements connected in series. The number of the second light-emitting elements is greater than that of the one or more first light-emitting elements. The first and second light-emitting units are connected in parallel to each other. A first light emission peak wavelength of the first light-emitting element is different from a second light emission peak wavelength of the second light-emitting element. A second forward voltage of the second light-emitting element is lower than a first forward voltage of the first light-emitting element. An absolute value of a difference between a forward voltage of the first light-emitting unit and a forward voltage of the second light-emitting unit is lower than the second forward voltage of the second light-emitting element.