Technologie řízení automotive LED světlometů

Abstract

This thesis deals with the design of a digitally controlled current converter for automotive LED headlights. Following a theoretical comparison of dimming methods, a SEPIC converter operating at a switching frequency of 400 kHz was designed. The control system, which includes a software Soft-Start, precise PWM, and a discrete PID controller with feedback provided by INA213 amplifiers, is driven by an STM32G474RET6 microcontroller. The device is further equipped with a CAN interface and essential hardware protections. The proposed concept was practically validated on a constructed single-channel prototype, where laboratory measurements confirmed its excellent thermal stability and the reliability of the digital regulation. Based on these results, the thesis ultimately presents a complete design of a final four-channel Light Driver Module (LDM) ready for future physical implementation.