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Wubing Liao,Yuanrui Chen,Jun Zeng,Xiaobin Hong 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.4
Existing voltage equalization topologies based on the switched-capacitor (SC) operate in the hard-switch state with large energy losses and slow balancing speeds. Therefore, a voltage equalization topology derived from a composite-structure resonant switched-capacitor is proposed in this paper. The proposed topology can achieve zero-current operation and modularity, which reduces system loss and cost. Meanwhile, it can provide two equalization paths from one cell to any other cell, which improves its balancing speed. The zero-current operation, equivalent circuit, design guidelines, and modularization designs for the proposed topology are analyzed in detail. An experiment prototype is established. Results obtained with the prototype verify that the proposed equalizer can achieve zero-current switching (ZCS), high balancing efficiency, and decoupling characteristic between the balancing time and the number of storage cells.
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Novel cross‑switch seven‑level inverter with triple boost capability and self‑balancing
Jianxin Zhao,Yuanrui Chen,Jun Zeng,Lintao Wang,Junfeng Liu 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.9
A novel single-phase seven-level inverter using a cross-switch cell (CSC) is presented in this paper. Compared with conventional inverters, the proposed topology can generate seven-level output, triple boost gain with one dc source and a reduced number of switches. The CSC provides different charging paths for the capacitors to realize self-balance. Hence, the proposed inverter can realize self-balancing without additional control methods or sensors. Moreover, the proposed structure inherently generates negative output voltage levels without a back-end H-bridge circuit, which reduces the voltage stress on switches. This paper has fully illustrated the operation principles, and presents capacitance calculation and loss analysis. Afterward, a comparative study against recently proposed seven-level inverters is introduced, illustrating the merits of the proposed topology in terms of reduced switches, high voltage-boosting capacity, and self-balancing. Ultimately, a laboratory prototype is built for the validation of the proposed inverter.
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