LED Lighting Apparatus with Voltage and Current Regulator Circuits
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Solution Overview
Problem
Existing solid-state lighting systems face challenges in efficiently controlling the color output in response to varying current inputs, particularly in modular lighting setups where precise color management is required.
Innovation Solution
The proposed solution involves a bus configuration coupled to a controlled current source, incorporating a voltage regulator circuit and a current regulator circuit with buck current regulators, allowing for individual control of currents through multiple LED strings to vary the color output in response to current and voltage inputs, enabling precise color management and matching the color behavior of incandescent lamps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a controlled current source is used to drive LED modules with dimming input, then the light output intensity can be varied, but the color output cannot be precisely controlled to track a desired locus in color space
Solution Approach 1:
The LED module is divided into multiple LED strings with different color characteristics (e.g., warm white, cool white, colored LEDs). Each string is independently controllable through separate current paths, allowing the system to segment the color control function and adjust the contribution of each color component to achieve precise color locus tracking while maintaining intensity control.
2Adaptability or versatility
If multiple LED strings with different colors are used to achieve color control, then the color output can be varied, but the device complexity increases
Solution Approach 1:
Multiple LED strings with different color characteristics are combined in parallel within the same LED module, sharing common structural elements such as the substrate, mounting infrastructure, and portions of the electrical connections. This merging approach enables color variation capability while reducing the overall device complexity compared to having completely separate modules for each color.
Solution Approach 2:
The LED module is designed with multi-functionality by incorporating LED strings that can serve both as voltage regulation elements and as color control elements. The same physical structure supports multiple functions: some LED strings regulate bus voltage while others provide color tuning, reducing the need for separate dedicated components and simplifying the overall device architecture.
3Reliability
If LED strings are used to regulate bus voltage, then the voltage regulation is achieved, but the current control through each LED string becomes interdependent
Solution Approach 1:
Different LED strings are assigned different local qualities or functions within the module. Some LED strings are dedicated primarily to voltage regulation with less sensitive current control, while other strings are optimized for color control with more precise current regulation. This local differentiation allows voltage regulation reliability while maintaining ease of independent current control for color management.
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 approach allows for effective color control and intensity management in solid-state lighting systems, ensuring that the color output tracks a desired locus in a color space, enhancing the performance and adaptability of modular lighting applications.
Implementation Method 1
A solid-state light emitting device may include, for example, a packaged light emitting device including one or more light emitting diodes (LEDs)
Implementation Method 2
which may include organic light emission layers
Data Source
AI summary
An apparatus includes a bus configured to be coupled to a controlled current source and at least one light emitting device coupled to the bus. The apparatus further includes a voltage regulator circuit configured to regulate a voltage at the bus and a current regulator circuit configured to control a current through the at least one light emitting device. In some embodiments, the current regulator circuit is used to control a color output of the apparatus.