Measuring system for inverter load test

Sammanfattning

The rapid development of electric vehicles increases the need for reliable testing procedures for drivetrain power electronics. The inverter becomes a key component within this context, being responsible for converting the DC energy stored in the battery into the AC supply the motor requires. This component operates under demanding conditions, including high temperatures, high power demands, mechanical vibrations and continuous electrical stress. To address this, this thesis focuses on designing and studying the implementation of a test bench for inverter characterisation, aiming to evaluate inverter electrical performance under controlled load conditions and to assess the feasibility of an pass/fail evaluation methodology.This study includes the development of the experimental setup, the configuration of the measurement system, the implementation of the current control system, and the acquisition of electrical data under an automated load operating sequence. A statistical reference curve was constructed from repeated measurements to support objective evaluation. The test bench is based on a controlled inverter leg operating as a single-phase half-bridge, with a resistive load and an added inductance. The system is controlled through an Arduino-based platform, allowing different current references to be generated. Data acquisition is performed and synchronised with the current control system through a LabVIEW-based interface, coordinating the measurement instruments, current control and data logging in an automated test sequence. The results show that the proposed prototype is able to reproduce predefined current profiles and acquire synchronised electrical data. Among the tested profiles, the step sequence provided the most stable and repeatable conditions for efficiency evaluation. Further study between functional and faulty configurations demonstrates the feasibility of the proposed approach.