LED Module Series-Parallel Topology for Li-Fi Illumination
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Solution Overview
Problem
Conventional LEDs cannot generate white light directly and are limited in their ability to simultaneously provide effective illumination and data transmission due to increased input capacitance when used in parallel configurations, which affects bandwidth and data transmission rates.
Innovation Solution
An LED module with LED cells connected in series to reduce input capacitance, allowing for both illumination and data transmission by modulating the current flowing through the LED cells, enabling the simultaneous emission of light for visibility and data transmission without flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LED cells are connected in parallel to provide sufficient illumination, then illumination intensity is improved, but input capacitance increases which reduces bandwidth and data transmission rates
Solution Approach 1:
The LED module divides LED cells into separate groups: some connected in parallel for illumination and others connected in series for data transmission. This segmentation allows each group to optimize for its specific function without compromising the other, resolving the contradiction between illumination intensity and data transmission rate.
Solution Approach 2:
The patent combines multiple LED cells into a single integrated LED module that simultaneously performs both illumination and data transmission functions. By merging these functions into one device with carefully designed circuit connections, the system achieves both high illumination intensity and high data transmission rates without requiring separate systems.
2Productivity
If LED cells are connected in series to reduce input capacitance and improve data transmission, then bandwidth is improved, but illumination intensity decreases
Solution Approach 1:
The LED module segments LED cells into functionally separate groups with different connection configurations. One segment connects cells in series optimized for data transmission with reduced capacitance, while another segment connects cells in parallel optimized for illumination intensity, allowing each to perform its function effectively.
Solution Approach 2:
The LED module is designed as a universal device that performs multiple functions simultaneously - both illumination and data transmission. By incorporating multiple LED cell groups with different connection topologies within a single module, the system achieves multi-functionality without requiring separate dedicated devices for each function.
3Reliability
If conventional LEDs are used for lighting applications, then high durability and low power consumption are achieved, but the ability to generate white light directly and simultaneously provide effective data transmission is limited
Solution Approach 1:
The patent merges multiple LED cell types and connection configurations into a single integrated module that simultaneously provides white light generation, high durability, and effective data transmission. This combination allows the system to maintain the reliability advantages of conventional LEDs while adding enhanced versatility for dual-function operation.
Solution Approach 2:
The LED module employs a composite structure with multiple LED cell groups having different electrical and optical characteristics. This composite architecture enables the module to generate white light while maintaining durability and simultaneously supporting high-rate data transmission, achieving versatility without sacrificing reliability.
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 series connection of LED cells reduces input capacitance, enhancing data transmission rates and maintaining consistent illumination, making it suitable for applications requiring both lighting and data communication.
Implementation Method 1
Light emitting diodes (LEDs) are an important class of solid-state devices that convert electric energy to light
Implementation Method 2
When a bias is applied across the cladding layers, electrons and holes are injected into the active layer where electrons and holes recombine to generate photons, or light
Implementation Method 3
The modulator provides driving current to the LED module to transmit data
Data Source
AI summary
An LED module has a controller with a modulator and illumination driver, and first and second LED chains. The first LED chain is connected to the modulator, has a first group of LED cells, and emits a first light under a pulse mode current input from the modulator. The first light has a digital data over a signal carrier. The second LED chain is connected to the illumination driver, has a second group of LED cells, and emits a second light under a constant current input from the illumination driver. There are fewer LED cells in the first group than the second group. The illumination driver is independent from the modulator in controlling emission of the first light. Alternatively, the LED module has a controller, an LED chain connected to the modulator, a first group of LED cells, and a second group of LED cells directly connected to the first group of LED cells. The first group of LED cells operates under a pulse mode current input from the modulator and emits a first light having a digital data over a signal carrier. The second group of LED cells emits a second light under a constant current input from the illumination driver.