Design and realization of an autoranging circuit for measuring current in automotive infotainment system

This thesis presents the design and performance evaluation of an adaptive current sensing system for automotive environments that autonomously adjusts its operational parameters to ensure high measurement accuracy in the microampere range while minimizing power dissipation when measuring currents in the ampere range. The technological framework underlying the developed hardware board is described, and the critical components are analyzed with respect to their electrical characteristics, performance specifications, and design constraints that influenced their selection. The design was initially validated through simulations performed in the LTspice environment, enabling functional verification and preliminary performance assessment. Based on these results, a custom PCB was designed, fabricated, and assembled. Finally, an extensive validation and debugging phase was carried out to verify compliance with the target measurement accuracy across multiple current ranges while maintaining acceptable power dissipation levels. For this purpose, a dedicated digital circuit was developed for data acquisition, and a laboratory test setup was implemented to perform systematic measurements and experimentally validate the proposed system.