Coupled Inductor Assisted High-Voltage Gain Half-Bridge Z-Source Inverter

Abstract

A half-bridge-based impedance-source inverter with two T-shaped coupled inductors is proposed in this article. Unlike the conventional half-bridge structure, the proposed topology can generate a zero-voltage level at its output stage. First, the proposed configuration and its modulation method are described, which will analyze the topology's various operational modes. Second, the boost factor is determined, and a way to design the necessary passive devices is found. Third, a power loss breakdown study is investigated in order to devise a solution to improve the efficiency of the proposed structure. Fourth, various comparisons show the benefits and drawbacks of the presented design. These comparisons show that the proposed topology can provide a high boost factor when coupled inductors are used. Furthermore, it has reduced voltage stresses on the components, resulting in a smaller size and lower cost. Finally, the experimental results are obtained by employing a prototype designed by the methodology presented in this article. These results are used as a benchmark to determine whether the proposed topology works well. In addition, the power loss analysis and efficiency comparison are displayed.

Keywords

• Half-bridge inverter
• half-bridge-based Z-source inverter
• impedance-source inverter
• Z-source inverter