Design of Hybrid Switched Diode Multilevel Inverter Using Single Dc Source

Abstract

This paper presents a novel design of a 21-level switched diode multilevel inverter using a High-Frequency Link (HFL) and a single DC source. The inverter structure consists of 10 power switches and 2 diodes, which significantly reduces the number of components compared to existing topologies. Despite the utilization of HFL for generating multiple voltages, the analysis reveals that the majority (65%) of the power is directly drawn from the single DC source, while only a small portion (35%) passes through the HFL. This reduces the size of the high-frequency transformer and the need for a large DC-DC converter. The proposed topology achieves 21 levels with a low output total harmonic distortion (THD) of 3.99% without the use of additional filters. These features make it suitable for various applications, including electric vehicles and motor systems.