This paper presents a novel topology called the capacitor-assisted active-switched quasi Z-source inverter (CA/AS-qZSI). The proposed CA/AS-qZSI topology has a high ac voltage gain and low voltage and current stresses on the diodes and extra switch in the Z-network. The design guide of the passive elements used in the proposed topology and a comparative study of the proposed CA/AS-qZSI and four other topologies with an active-switched impedance network are addressed. A new pulse-width modulation (PWM) technique using a sawtooth carrier signal is also suggested to reduce the switching losses of the diodes and switches. Compared with the traditional simple boost control method, the efficiency of CA/AS-qZSI using the new PWM technique is improved by 4–4.6%. The experimental results utilizing a prototype made in the laboratory demonstrate the performance of the proposed CA/AS-qZSI and PWM technique.

本文提出了一种称为电容器辅助有源开关准 Z 源逆变器 (CA/AS-qZSI) 的新型拓扑。所提出的 CA/AS-qZSI 拓扑具有高交流电压增益以及 Z 网络中二极管和额外开关上的低电压和电流应力。提出的拓扑中使用的无源元件的设计指南以及所提出的 CA/AS-qZSI 和其他四种具有有源开关阻抗网络的拓扑的比较研究得到了解决。还建议使用一种使用锯齿波载波信号的新脉宽调制 (PWM) 技术来降低二极管和开关的开关损耗。与传统的简单升压控制方法相比，采用新型 PWM 技术的 CA/AS-qZSI 的效率提高了 4-4.6%。