Universal lighting control of unknown connected light emitting diode arrays via a T–S fuzzy model-based approach

This study presents a universal lighting driver for unknown connected light emitting diode (LED) arrays by using a single-ended primary inductor converter (SEPIC) DC/DC converter and a T-S fuzzy model-based current controller. Driving and lighting an LED array with unknown series and parallel connection is a significant research for universal adaptable applications. To this end, the input voltage of the LED array is up/down adjusted by the SEPIC DC/DC converter, whereas exact LED lighting current control is realised by the proposed T-S fuzzy parallel distributed integral compensation control method. For easier implementation, a linear-simplified fuzzy observer is introduced under output feedback. Asymptotic convergence is guaranteed by strict stability analysis and linear matrix inequality gain design. Moreover, the fuzzy lighting current controller does not require the electrical model and arrangement of the LED array. In addition, even if we take uncertainty, disturbance and rapidly changing reference current into consideration, the high robustness and transient response performance are still assured via robust gain design. Finally, the satisfactory performance is shown from experimental results.