A New Topology using HFL for Transformer-Based Multilevel Inverters

This paper presents a new hybrid structure for transformer based multilevel inverter (MLI) topologies. The proposed topology integrates an asymmetric multiplexer circuit (push-pull), a high frequency link (HFL) circuit and PUC to produce 11 levels at the output voltage wave. The main structure includes 10 power switches and four rectifier diodes. Simulation results and experimental results confirm that the proposed inverter effectively synthesizes the 11-level AC voltage waveform with low total harmonic distortion (THD). The inverter is tested with 100Ω pure resistive, 30mH and 50mH inductive loads under different load conditions to verify its robustness and operational stability. Loss simulations are performed with PLECS software. The power loss analysis shows that the system operates with an efficiency of 98% in overall performance. The dynamic response of the inverter is analyzed under varying modulation indices and operating frequencies and shows reliable performance over a wide operating range. Due to its high efficiency and reduced component count, the proposed topology is particularly suitable for single-source applications such as renewable energy integration, stand-alone power systems and electric vehicle inverters.