LED Light Source Circuit Topology for Far-Red and UV Spectrum
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Solution Overview
Problem
Existing LED light source devices for horticultural applications face challenges in combining light emission in far-red and near-UV wavelength areas due to differing electrical characteristics, making it difficult to create a simple and cost-effective device that mimics the sunlight spectrum for optimal plant growth.
Innovation Solution
An LED light source device design that includes multiple LED devices arranged in a circuit with current regulators to balance driving currents and forward voltages, allowing for a single current source to drive all LEDs, and incorporates phosphor layers and lenses to shape light emission, ensuring a balanced spectrum similar to sunlight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple LED devices with differing electrical characteristics are combined in a single circuit, then the device complexity and manufacturing costs are reduced, but it becomes difficult to balance the different driving currents and forward voltages of the respective LED devices
Solution Approach 1:
The circuit is segmented into multiple parallel first current paths, each containing series-connected first LED devices. This segmentation allows independent current regulation for each path while maintaining a unified single-current-source architecture, resolving the contradiction between circuit simplicity and current balancing precision.
Solution Approach 2:
The patent employs current regulators that dynamically adjust electrical parameters (current magnitude) for each LED device or current path. By changing the current parameter individually for each path while using a single current source, the system achieves precise current balancing without increasing overall circuit complexity.
2Stability of the object's composition
If LED light source devices provide significant light emission in far-red and near-UV wavelength areas, then the spectrum similarity to sunlight is improved, but the difficulty of combining LED devices increases due to differing electrical characteristics
Solution Approach 1:
The single current source serves multiple functions by providing current to all three types of LED devices (white light, far-red, and near-UV) through the parallel current path architecture. This universal current supply mechanism enables diverse spectral output while maintaining a unified and simple power delivery system.
Solution Approach 2:
The current regulators act as intermediary components between the single current source and the diverse LED devices with different electrical characteristics. These intermediaries adapt and adjust the current parameters for each LED type, enabling harmonious integration of devices with vastly different electrical requirements into a single circuit.
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
The solution enables a cost-effective and efficient LED light source that provides a balanced spectrum with significant light emission in the 730nm far-red and 385nm near-UV areas, improving energy efficiency and reducing manufacturing complexity while providing optimal lighting conditions for plant growth.
Implementation Method 1
The phosphor layer may serve to convert a first light spectrum emitted by the stacked semiconductor structure into a second light spectrum to be emitted by the first LED device
Implementation Method 2
The lens may serve to shape a light emission beam of the second and/or third LED device
Data Source
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AI summary
An LED light source device (20) is disclosed, comprising: (a). a plurality of first LED devices (22) configured to emit white light, (b). at least one second LED device (23) configured to emit far red light, and (c). at least one third LED device (24) configured to emit UV light; wherein the plurality of first, second and third LED devices (22, 23, 24) are arranged in a circuit, the circuit comprising first and second terminals (25, 26) for connection with a single current source; the circuit further comprising a plurality of parallel first current paths (30, 30', 30"), each first current path (30) comprising a number of first LED devices (22) connected in series; a first group of first current paths (30) being arranged in series with a second current path (31), comprising at least one second LED device (23); and a second group of first current paths (30') being arranged in series with a third current path (32), comprising at least one third LED device (24).