Due to the high forward voltage drop of reverse-blocking (RB) switches, conventional current-source inverters (CSIs) typically suffer efficiency penalties. Bidirectional (BD) switches, on the other hand, can also block reverse voltages but with less conduction loss than RB switches, making them more attractive candidates for CSI switches. This article discusses the difficulties inherent in implementing BD switches in CSIs, such as dc-link overvoltage, interphase short circuit, more complicated commutation schemes, high body diode conduction loss, and additional gate control signals. To address these issues, a new CSI topology (H8-CSI-BD) is proposed, which is optimized for the use of single-gate wide bandgap (WBG) BD switches. The proposed topology and its modulation scheme guarantee safe operation of CSI, eliminate BD switch’s body diode conduction loss, and achieve significant efficiency improvement. In addition, its requirement for single-gate control signals for its BD switches simplifies control and gate drive circuits noticeably. The advantages of the H8-CSI-BD topology over the other CSIs using either RB or BD switches are confirmed by analysis, simulation, and experimental results.

中文翻译：

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采用单栅WBG双向开关的H8电流源逆变器


由于反向阻断 (RB) 开关的正向压降较高，传统电流源逆变器 (CSI) 通常会遭受效率损失。另一方面，双向 (BD) 开关也可以阻止反向电压，但传导损耗比 RB 开关更小，这使其成为 CSI 开关更有吸引力的候选者。本文讨论了在 CSI 中实现 BD 开关所固有的困难，例如直流母线过压、相间短路、更复杂的换向方案、高体二极管传导损耗以及额外的栅极控制信号。为了解决这些问题，提出了一种新的 CSI 拓扑 (H8-CSI-BD)，该拓扑针对单栅宽带隙 (WBG) BD 开关的使用进行了优化。所提出的拓扑及其调制方案保证了CSI的安全运行，消除了BD开关的体二极管导通损耗，并实现了显着的效率提升。此外，BD 开关对单栅极控制信号的要求显着简化了控制和栅极驱动电路。分析、仿真和实验结果证实了 H8-CSI-BD 拓扑相对于使用 RB 或 BD 交换机的其他 CSI 的优势。