Scheduled gains control applied to a DC-DC converter for light intensity dimming an LED lamp

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Gregorio Saúl Olivar-Castellanos
Luis Gerardo Vela-Valdés
Jesús Aguayo-Alquicira


Nowadays there are several applications of LED lighting, but some of them require to precisely regulate lighting in a wide range of operation, mainly in tracking tasks. In these cases, it is necessary to consider the nonlinearity of the LED for the design of control schemes; moreover, an efficient power source is needed to supply the voltage and current variations required by the lamp. This paper presents the design of a DC-DC converter capable of implementing these variations, as well as the design, simulation and comparison of classical PI, fuzzy PI and gain-scheduling control schemes for these applications. In order to validate the described control schemes and to comply with the recommendations of the World Health Organization, the control of the illuminance produced by an eye protection lamp is taken as a case study, where the controller varies the duty cycle of the converter to adjust the voltage of the lamp, and consequently regulate the luminous intensity. Comparing the control schemes, the gain-scheduling control has a better performance for the case study described above, presenting a steady state error of 0% and lower overshoot.