Study the effect of series and parallel LEDs connections on the output current ripple for LED driver of solar street lighting

Hassan, Youssef; Orabi, Mohamed; Ismeil, Mohamed A.; Alshreef, Abdulaziz

doi:10.1109/mepcon.2017.8301380

Cited by 5 publications

(4 citation statements)

References 12 publications

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“…The modern published papers [4], [5], [6] are interactive with the preliminary work published in [7] by citation, hereby the authors verify the model by the experimental results and explained the dynamic model mathematically, and deduced the transfer function of the control system.…”

Section: Overview Of Solar Street Leds Modelingmentioning

confidence: 89%

“…where P opt is the optical power that refers to the illumination, P H is the heat loss given by equation (7).…”

Section: Electrical and Optical Led Efficiencymentioning

confidence: 99%

“…P H = P nr + P s (7) where P nr is the non-radiative recombination heat loss which is material dependent, and P s is the power loss due to the LED equivalent series resistance R s , it is calculated by equation (8).…”

Section: Electrical and Optical Led Efficiencymentioning

confidence: 99%

“…If LED street lighting consists of a number of LED lenses (LEDs) equal to u, the external series resistance R Ext that is used to sense and limit the LED current, is connected in series per array as shown in Figure 4, then it is denoted as common R Ext (C • R Ext ) or it connected in series per string as shown in Figure 5, then it is denoted as separate R Ext (S • R Ext ), the LEDs equivalent dynamic resistance R LEDs is depending on the type of LEDs connection [13] as described in TABLE 1, where N is the number of LEDs per string and M is the number of strings per array, where u = N • M , then the LEDs equivalent dynamic resistance R LEDs will be the highest for the series connection, it will be the lowest for the parallel connection, and it will be ranged in between highest and lowest values for the hybrid connection. As mentioned in [7] and [15] based on voltage and Kirchhoff's current laws for the circuit shown in Figure 4 and Figure 5, by assuming that all LEDs are identical and each LED has a dynamic resistance r D , then the LEDs equivalent dynamic resistance of R LEDs is depending on the connection type as shown in TABLE 1, it is calculated as the following:…”

Section: Effect Of Connection Type On the Leds Equivalent Dynamic Res...mentioning

confidence: 99%

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Fulfill Optimum Calibrated Size of LED Driver Components for Solar Street Lighting Fixture by Adjusting the LEDs Connections

et al. 2023

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Since using of Light-Emitting Diode (LED) lighting fixtures, researchers are working to improve the efficiency and increase the lifetime of LEDs. Each LED lighting fixture consists of two main parts, the 1st part is LEDs lenses that produce illumination, and the 2 nd part is the LED driver that energized the LEDs with the required operating voltage and current. One of the most important issues that the researchers follow to increase the lifetime of LEDs is to replace the electrolytic capacitor to avoid the repeated flashlight or Purkinje effect on human eyes and animal behaviors. This paper submits a free-cost method to reduce the size and cost of the passive LED driver components such as electrolytic capacitors and inductors also managing the voltage and current rating of active components such as power electronic switches (MOSFET and Diode) to manage their cost, the new method is depending on adjusting the LEDs lenses connection's to fit the suitable LEDs equivalent dynamic resistance that regulating the LEDs voltage and current ripple, then fulfill the optimum size of the LED driver components that calculated by the designer and selecting the nearest corresponding standard value in the market.INDEX TERMS Solar street lighting, LED driver electrolytic capacitor less, light-emitting diode (LED), LED series and parallel connection, LED dynamic resistance.

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