Wang Yaoqiang1, Yuan Yisen1, Chen Tianjin2, Wang Kewen1, Liang Jun1, 3
1. School of Electrical Engineering Zhengzhou University Zhengzhou 450001 China; 2. XJ Power Co. Ltd Xuchang 461000 China; 3. Cardiff University Cardiff CF243AA UK
Abstract：The conventional multilevel inverter has complicated extension and a large number of devices. This paper proposes an extensible T-type switched capacitor multilevel inverter. The multi-level output is achieved through voltage division of the T-type dual capacitor module and step-by-step charging method. The inverter can ensure the voltage balance of the voltage-dividing capacitors. The switched capacitors are charged step by step, so that the number of devices in the extension of the inverter increases with output levels in a logarithmic curve, which is lower than the conventional topology with linear increase. The seven-level inverter can output an AC PWM wave voltage with a peak value of 45V under a DC input of 30V, achieving a voltage gain of 1.5 times. The proposed inverter can realize the inversion without the H-bridge, which reduces the total standing voltage of the switches. In this paper, the topology composition, working principle, modulation strategy and extension comparison of the proposed inverter are analyzed, and the correctness and feasibility of the novel T-topology circuit are verified by experiments.
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2020, Vol. 35 
