Comparison of exponential and constant voltage based models of power LED driven by isolated CUK DC-DC converter

Abstract

Design and application of LED driver with isolated CUK converter for 10W is realized in this paper especially for automotive purposes. The advantage of isolated CUK topology from conventional CUK topology is to have electrical isolation with supply and load and providing same polarity output. Besides, power LED models including constant voltage and exponential model are obtained and employed in simulation study. Furthermore, maximum current limitation of power LED is provided via dsPIC30f4011 microcontroller. Also, power switch is operated by 100 kHz switching frequency, and connection of the power LED driver to the source provided by LC with parallel damping filter, whose noise reduction shown by application as well. Thanks to the experimental set up and simulations, proving the desired results provided by the converter is shown by the measurement of LED current-voltage, input voltage-current. Simulation results also verifies application. Moreover, it is shown that exponential power LED model provides more accurate results than constant voltage model.