Simplified electrical modelling of power LEDs for DC–DC converter analysis and simulation

Osorio, R.; Alonso, J.M.; Pinto, Sergio; Martínez, Gilberto; Vázquez, N.; Ponce-Silva, Mario; Martínez, A.

doi:10.1002/cta.2355

Cited by 4 publications

(3 citation statements)

References 21 publications

(60 reference statements)

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“…Electrical characteristics of LED can be simulated using any one of the (i) linear, [2][3][4]7,14 (ii) parabolic, 1,15 (iii) exponential, [16][17][18] and (iv) modified Shockley 5,6,19 model. The corresponding model equations for a single LED chip are given below in 1-4.…”

Section: Introductionmentioning

confidence: 99%

“…where V D and I D are the forward voltage (V) and forward current (A) of the LED, respectively; V FD is the forward voltage drop (V); R D is the dynamic resistance (Ω) 14 ; a p1 , a p2 , and a p3 are the adjustable constants of the parabolic or second-order model 15 ; I sat is the reverse saturation current (A) [16][17][18][19] ; n is the diode ideality factor [16][17][18][19] ; r s is the internal series resistance (Ω) of LED that causing a voltage drop I D Á r s 5,6,19 ; and V T is the thermal voltage of the LED (in V) dependent on the junction temperature. [16][17][18][19] Among the above models, the linear model is the most widely practiced one because of its straightforwardness, ease of constant synthesis, and good accuracy near the rated operating point. Recent LED driver prototypes attempt to incorporate dimming feature for the sake of power-saving and task-tuning.…”

Section: Introductionmentioning

confidence: 99%

“…The corresponding model equations for a single LED chip are given below in 1–4.

Linear model : V_{D} = I_{D} \cdot R_{D} + V_{FD}

Parabolic model : I_{D} = a_{p 1} V_{D}^{2} + a_{p 2} V_{D} + a_{p 3}

Exponential model : I_{D} = I_{sat} \cdot \exp ((), \frac{V_{D}}{n \cdot V_{T}})

Modified Shockley model : I_{D} = I_{sat} \cdot \exp ((), \frac{V_{D} - I_{D} \cdot r_{s}}{n \cdot V_{T}})

where V D and I D are the forward voltage (V) and forward current (A) of the LED, respectively; V FD is the forward voltage drop (V); R D is the dynamic resistance (Ω) 14 ; a p 1 , a p 2 , and a p 3 are the adjustable constants of the parabolic or second‐order model 15 ; I sat is the reverse saturation current (A) 16–19 ; n is the diode ideality factor 16–19 ; r s is the internal series resistance (Ω) of LED that causing a voltage drop I D ⋅ r s 5,6,19 ; and V T is the thermal voltage of the LED (in V) dependent on the junction temperature 16–19 …”

Section: Introductionmentioning

confidence: 99%

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Electrical model formulation for multicolor light‐emitting diode modules and its application to design dimmable driver

Bakshi¹,

Roy

2021

Circuit Theory & Apps

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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.

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