Abstract

OLIVAR-CASTELLANOS, Gregorio Saúl; VELA-VALDES, Luis Gerardo  and  AGUAYO- ALQUICIRA, Jesús. Scheduled gains control applied to a DC-DC converter for light intensity dimming an LED lamp. Ingenius [online]. 2023, n.29, pp.66-78. ISSN 1390-860X.  https://doi.org/10.17163/ings.n29.2023.06.

Nowadays there are several applications of LED lighting, however, some of them require to regulate the lighting with precision and in a wide range of operation, mainly in tracking tasks. It is in these cases where it is necessary to consider the nonlinearity of the LED for the design of control schemes, moreover an efficient power source is needed to the changes in voltage and current required by the lamp. This paper presents the design of a DC-DC converter capable of performing and supporting these variations, as well as the design, simulation and comparison of classical PI, fuzzy PI and scheduled gains control schemes for these applications. In order to validate the described control schemes, and with the purpose of complying 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, thus adjusting the voltage of the lamp, and consequently regulating the luminous intensity. Comparing the control schemes, the performance of the system with scheduled gains control has better characteristics for the case study described above, presenting a steady state error of 0% and lower overshoot compared to the other control schemes developed.

Keywords : Control; Converter; Dimming; Scheduled Gains; LED; Nonlinear.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )