Electrical model formulation for multicolor light-emitting diode modules and its application to design dimmable driver,International Journal of Circuit Theory and Applications

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Electrical model formulation for multicolor light-emitting diode modules and its application to design dimmable driver
International Journal of Circuit Theory and Applications ( IF 1.8 ) Pub Date : 2021-02-23 , DOI: 10.1002/cta.2977
Biswadeep Gupta Bakshi ₁ , Biswanath Roy ₂

Affiliation

A multicolor light-emitting diode (LED) module comprises LED chips of more than one type or color and is frequently used for spectrally tunable lighting applications. In this paper, electrical models of such multicolor LED modules are formulated taking two basic circuit configurations into account, namely, (i) conventional, where a parallel string is made of one particular LED type, and (ii) nonconventional, where a parallel string is composed of different LED types. For deriving the model equations, the basic exponential model of a single LED chip has been applied, which is experimentally found to be the suitable option out of the four existing models, namely, linear, parabolic, exponential, and modified Shockley models. The formulated models are experimentally validated, results of which show maximum deviations of 4.71% and 4.19% from the measured data in the nonlinear and the linear operating regions, respectively. The formulated models are utilized to design dimmable, isolated LED drivers for red-green-blue (R-G-B) LED module. Performance evaluation of the drivers is conducted in Matlab-Simulink. The results reveal the satisfactory operation of the LED modules in terms of current and power regulation, branch current matching, and fast response and thus establish the effectiveness of the proposed algorithm.

中文翻译：

多色发光二极管模块的电学模型公式及其在可调光驱动器设计中的应用

多色发光二极管 (LED) 模块包括不止一种类型或颜色的 LED 芯片，并且经常用于光谱可调照明应用。在本文中，这种多色 LED 模块的电气模型是在考虑两种基本电路配置的情况下制定的，即 (i) 常规，其中并联串由一种特定的 LED 类型制成，以及 (ii) 非常规，其中并联串由不同的 LED 类型组成。为了推导模型方程，应用了单个 LED 芯片的基本指数模型，实验发现这是现有四种模型中的合适选项，即线性模型、抛物线模型、指数模型和修正的肖克利模型。公式化的模型经过实验验证，其结果显示最大偏差为 4.71% 和 4。分别来自非线性和线性工作区域的测量数据的 19%。公式化模型用于为红绿蓝 (RGB) LED 模块设计可调光、隔离式 LED 驱动器。驱动程序的性能评估在 Matlab-Simulink 中进行。结果表明 LED 模块在电流和功率调节、支路电流匹配和快速响应方面的运行令人满意，从而证明了所提出算法的有效性。

更新日期：2021-02-23

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