An evaluation of power inverter’s performance under the modulation of dc-offset rectified signal with triangular wave

This paper presents power inverter topology that employs DC-offset rectified signal modulation with a triangular carrier to achieve high-quality AC output. The proposed system integrates a doubly diode-connected DC-DC converter for impedance reduction, a minimized full-bridge switch configuration, an LC filter, and a leakage current mitigator. Unlike conventional two-stage H-bridge converters, the design introduces an improved DC modulation scheme that generates two distinct switching pulse regions, thereby suppressing both lower- and higher-order harmonics to near-negligible levels. The incorporation of two-in-one IGBT switches reduces soldering stress, copper usage, and external disturbances from stray capacitances and inductances, while the dedicated current mitigator ensures effective leakage current suppression. The system was modelled in MATLAB/Simulink (2018a) and validated experimentally, delivering a 230 Vrms, 50 Hz pure sine output with 0.2687% THD, 1500 W rating, and 96.33% efficiency. These results demonstrate significant improvements in harmonic mitigation, efficiency, and component optimization, making the system suitable for applications in rural healthcare, domestic appliances, and telecom base stations.