Development of a Multi-Mode Switching-Inverter Laboratory Module for an Introductory Power Electronics Course

Author

• Darcy Eliasi, California Polytechnic State University, San Luis ObispoFollow

Available at: https://digitalcommons.calpoly.edu/theses/3276

Date of Award

6-2026

Degree Name

MS in Electrical Engineering

Department/Program

Electrical Engineering

College

College of Engineering

Advisor

Taufik

Advisor Department

Electrical Engineering

Advisor College

College of Engineering

Abstract

DC–AC converters, or inverters, are essential power‑electronic interfaces widely used in photovoltaic systems, microgrids, energy‑storage installations, and numerous other modern electrical applications. This thesis presents the design, construction, and testing of an improved laboratory module developed as a student learning tool for demonstrating four fundamental inverter switching techniques: simple square wave (SSWI), modified square wave (MSWI), bipolar PWM, and unipolar PWM. Building upon the previous module, the improved design centers on three key enhancements. These include the selection of a more suitable wave‑generation solution, a multiplexer‑based mode‑selection architecture that reduces user complexity and eliminates conflicting signal configurations, and the integration of an external MOSFET full bridge stage that serves both as the functional inverter and as a visual aid, replacing the earlier monolithic implementation. This new module features a physically compact four-layer PCB design with an easy-to-use guided design, integrated shoot‑through protection, accessible test points, and LED indicators for method identification. A toggleable output LCL filter allows users to observe both filtered and unfiltered waveforms for the PWM switching methods. The design was validated through MATLAB Simulink and LTspice simulations, supplemented by independent component testing when no suitable simulation model was available. Hardware testing and validation were performed for all four switching methods, and the resulting efficiency measurements demonstrated improved performance compared to the original design. The final, improved board serves as a versatile, safe, and highly user‑friendly tool for exploring inverter switching concepts beyond the traditional classroom environment.