This paper develops a modular multilevel inverter which integrates driving/braking control schemes in a unit for electric vehicles. The multiple driving components are used to balance surge voltage/current across the last stage power MOSFETs due to abrupt back electromotive force (EMF) generated by the permanent magnet synchronous motor (PMSM). A fundamental unit of the motor driver generally consists of multiple power MOSFETs connected in series/parallel with a braking resistor. These units can be assembled according to the design. In practice, when a PMSM is driven due to inertia rotation, it becomes a power generator which would induce back EMF caused by magnetic induction when a braking command is applied to the driver. If one tries to increase braking effect by reversing driving torque with any approaches for immediately or fast stopping the rotating motor, it commonly leads to switching element breakdown due to the surge counter EMF. In this paper, with the expandable series–parallel design of the inverter circuit, surge voltage/current is dispersed in a balanced manner. Compared with conventional three-phase motor driver design, the proposed one possesses better durability. Also, it reduces hardware cost since it allows low-grade power components to be used in the high-power motor drivers.

中文翻译：

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集成多个驱动元件的电机驱动/制动控制方案

本文开发了一种模块化多电平逆变器，它在电动汽车单元中集成了驱动/制动控制方案。由于永磁同步电机 (PMSM) 产生的突然反电动势 (EMF)，多个驱动组件用于平衡最后一级功率 MOSFET 上的浪涌电压/电流。电机驱动器的基本单元通常由多个功率 MOSFET 与制动电阻串联/并联组成。这些单元可以根据设计进行组装。在实践中，当 PMSM 因惯性旋转而被驱动时，它会变成一个发电机，当向驱动器施加制动命令时，它会产生由磁感应引起的反电动势。如果试图通过反转驱动扭矩以及立即或快速停止旋转电机的任何方法来增加制动效果，通常会由于浪涌反电动势而导致开关元件损坏。在本文中，逆变器电路采用可扩展的串并联设计，浪涌电压/电流以平衡的方式分散。与传统的三相电机驱动器设计相比，所提出的一种具有更好的耐用性。此外，它降低了硬件成本，因为它允许在大功率电机驱动器中使用低等级的功率元件。与传统的三相电机驱动器设计相比，所提出的一种具有更好的耐用性。此外，它降低了硬件成本，因为它允许在大功率电机驱动器中使用低等级的功率元件。与传统的三相电机驱动器设计相比，所提出的一种具有更好的耐用性。此外，它降低了硬件成本，因为它允许在大功率电机驱动器中使用低等级的功率元件。