In this study, a new multilevel inverter (MLI) configuration is proposed to generate higher number of levels with minimal control switches. The proposed inverter's nomenclature is E ^K θ MLI, termed from its stems of shape. Conventional single-phase H-bridge module is modified to design the structure of θ MLI called ‘θ cell’ (where, K = 0) by incorporating three symmetrical DC-sources and replacing one leg of H-bridge by bidirectional switches. The θ cell of the proposed E ^K θ MLI generates five-level AC waveform at the output by using only four controlled switches (two unidirectional and two bidirectional). Therefore, the size, cost and switching logic of the MLI is reduced. The basic structure of E ^K θ MLI called ‘Eθ MLI’ (where K = 1) is designed which is capable of generating seven-level. For further extension, double-switch-E cell (DS-E cell) is added in the middle and each DS-E cell increases the four levels by utilising two bidirectional switches and two DC supplies. The generalised MLI configuration is explained in niceties to generate a higher number of levels (more than 5). The modes of operation, voltage across the switches, power losses of E ^K θ are discussed. The proposed MLI is experimentally investigated using level shifting pulse width modulation.

中文翻译：

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È ^ķ θ多级逆变器-对于较高数目的输出电压电平的最小开关新颖的配置

在这项研究中，提出了一种新的多电平逆变器（MLI）配置，以使用最少的控制开关来生成更多的电平。所提出的逆变器的命名法为E ^ķ θMLI，称为从其茎形状。修改了传统的单相H桥模块，以设计称为``θcell''的θMLI结构（其中，ķ= 0），包括三个对称的直流电源，并用双向开关替换H桥的一个分支。所提出的E的θ细胞 ^ķ θMLI通过使用只有四个受控制的开关（两个单向和两个双向）在输出端产生五电平AC波形。因此，减小了MLI的尺寸，成本和切换逻辑。E的基本结构 ^ķ θMLI称为“EθMLI”（其中ķ= 1）被设计为能够生成七级。为了进一步扩展，在中间添加了双开关E单元（DS-E单元），每个DS-E单元通过利用两个双向开关和两个DC电源来增加四个级别。很好地解释了通用MLI配置，以生成更多级别（超过5个）。操作模式，开关两端的电压，E的动力损失 ^ķ θ进行了讨论。提出的MLI使用电平移动脉冲宽度调制进行了实验研究。