Experimental Verification of Mathematical Models for Failure Estimation of Electronic Systems

K. Sokół, P. Ptak Czestochowa University of Technology, 42-201 Czestochowa, Poland

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Numerous techniques for analyzing electronic circuits play a key role in the design process of any product designed for harsh environments. This article compares the design and analysis approach with the experimental verification of a real circuit for a diode-based semiconductor circuit that is part of voltage balancing systems for lithium-polymer cells for industrial applications. The purpose of the design and analysis process is a reliable solution that performs all the required functions under real operating conditions, including critical parameters that may occur during normal system operation. Preliminary circuit design is done using ideal components. Using the truth table as a representation of the requirements, the correctness of the system's operation was checked. LTSpice was used as the main program for designing and testing analog and mixed integrated circuits. Based on the system requirements, real components are selected, followed by the worst case analysis that takes into account tolerances, noise, mains voltage disturbances, temperature and aging. Foster and Cauer thermal models were created for components exposed to thermal stress. After a successful WCA analysis, a security analysis is carried out that predicts possible defects and their impact on the entire project due to problems during system production and operation. The WCA results were compared with experimental measurement of a real system that was subjected to a high temperature in a thermal chamber that simulates the work of the system after 10 years.

DOI:10.12693/APhysPolA.138.291 topics: failure estimation, experimental test, electronic circuit, WCA test