Mansourizadeh Hossein, Hosseinpour Majid, Seifi Ali, Shahparasti Mahdi
Department of Electrical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran.
School of Technology and Innovations, University of Vaasa, Vaasa, Finland.
Sci Rep. 2025 Jan 2;15(1):290. doi: 10.1038/s41598-024-84148-y.
This paper proposed a hybrid switched-capacitor inverter to reduce the number of components and achieve automatic capacitor balancing. The proposed structure combines a switched capacitor (SC) unit with a flying capacitor (FC). Significant advantages of the proposed design include a reduced number of components, simple control, voltage boosting capability, and limitation of the inrush current during capacitor charging. The proposed structure used only eleven switches and three capacitors to generate 13 levels. Compared to other 13-level switched-capacitor inverters, the proposed structure utilizes fewer components, capacitors with lower maximum voltage, and fewer conduction components. The flying capacitor used in the proposed design can naturally balance at half of the input DC voltage (0.5V), enabling sensor-free operation. Therefore, with simple control over the inherent voltage balancing of the capacitors, the structure requires only six switching signals, which reduces the overall system cost. Circuit performance analysis, automatic capacitor balancing, and the charging and discharging processes are introduced. Subsequently, a numerical comparison is made with recently proposed 13-level switched-capacitor inverters, demonstrating the advantages of reduced active components, simplified control, cost-effectiveness, and low power losses. Finally, simulation results are presented to confirm the performance of the proposed structure.
本文提出了一种混合开关电容逆变器，以减少元件数量并实现电容器自动平衡。所提出的结构将开关电容（SC）单元与飞跨电容（FC）相结合。该设计的显著优点包括元件数量减少、控制简单、具有升压能力以及限制电容器充电期间的浪涌电流。所提出的结构仅使用11个开关和3个电容器来产生13电平。与其他13电平开关电容逆变器相比，所提出的结构使用的元件更少、电容器的最大电压更低且导通元件更少。所提出的设计中使用的飞跨电容可以在输入直流电压的一半（0.5V）处自然平衡，从而实现无传感器运行。因此，通过对电容器固有的电压平衡进行简单控制，该结构仅需要六个开关信号，这降低了整个系统的成本。文中介绍了电路性能分析、电容器自动平衡以及充放电过程。随后，与最近提出的13电平开关电容逆变器进行了数值比较，证明了其在减少有源元件、简化控制、成本效益和低功率损耗方面的优势。最后，给出了仿真结果以证实所提出结构的性能。
