An impedance-source inverter can offer the voltage buck-boost function in a single-stage circuit. Its advantages include a simple structure, safety, and reliability. This article proposes a Cockcroft–Walton multiplier voltage (CWMV) impedance-source inverter consisting of a modified CWMV circuit and an impedance-source inverter. There are two types of circuits: the CWMV Z-source inverter (ZSI) and the CWMV quasi-Z-source inverter (qZSI). In a CWMV qZSI, the input current is continuous, the voltage overshoot across the bridge is small, and the boost capability is great, with the disadvantage is that its passive component count is increased. This article studies the static and dynamic characteristics of the two inverters. The operating modes of the CWMV qZSI is studied, the voltage and current stress of each device are analyzed, the small signal model of the circuit is established, and a proportional-integral-differential controller with good control performance is designed. Compared with existing impedance-source inverters, a CWMV qZSI has obvious advantages in terms of the voltage and current stresses on components, and also in terms of its inductor size, magnetic core volume, and overall efficiency. The theoretical analysis was verified by a 1 kW laboratory prototype. The experimental results were consistent with the theoretical analysis.

中文翻译：

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广义 Cockcroft-Walton 乘法器电压 Z 源逆变器

阻抗源逆变器可以在单级电路中提供电压升降压功能。其优点包括结构简单、安全可靠。本文提出了一种 Cockcroft-Walton 倍增电压 (CWMV) 阻抗源逆变器，该逆变器由改进的 CWMV 电路和阻抗源逆变器组成。有两种类型的电路：CWMV Z 源逆变器 (ZSI) 和 CWMV 准 Z 源逆变器 (qZSI)。在CWMV qZSI中，输入电流是连续的，跨桥电压过冲小，升压能力大，缺点是被动元件数量增加。本文研究了两种逆变器的静态和动态特性。研究了CWMV qZSI的工作模式，分析了各器件的电压和电流应力，建立了电路的小信号模型，设计了具有良好控制性能的比例积分微分控制器。与现有的阻抗源逆变器相比，CWMV qZSI在元件的电压和电流应力、电感尺寸、磁芯体积和整体效率方面具有明显的优势。理论分析得到了 1 kW 实验室样机的验证。实验结果与理论分析一致。和整体效率。理论分析得到了 1 kW 实验室样机的验证。实验结果与理论分析一致。和整体效率。理论分析得到了 1 kW 实验室样机的验证。实验结果与理论分析一致。