This article presents a new three-phase multilevel inverter with boosting capability for low-voltage applications like electric vehicles and renewable energy sources. This inverter is fed by a single dc voltage source and each phase involves two low-voltage transistors, two high-voltage transistors, two diodes, and two capacitors. Except that the two high-voltage transistors withstand twice the dc input voltage, all other components are rated to the dc input voltage. With phase-disposition pulsewidth modulation, the two types of high- and low-voltage transistors operate in low and high switching frequencies, respectively. This is very beneficial for reducing switching losses and selecting semiconductor switches. The two capacitors are connected in parallel and series alternately with the dc source resulting in high ac output voltage with multiple levels, self-balanced capacitor voltages as well as low voltage ripples. The topology, operation principle, capacitors’ voltage ripples and power loss are analyzed in detail. Both simulation and experimental results are provided to demonstrate the feasibility of the proposed inverter.

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具有自平衡开关电容器的三相升压多电平逆变器

本文介绍了一种具有升压能力的新型三相多电平逆变器，适用于电动汽车和可再生能源等低压应用。该逆变器由单个直流电压源供电，每个相都包含两个低压晶体管，两个高压晶体管，两个二极管和两个电容器。除了两个高压晶体管可以承受两倍的直流输入电压外，所有其他组件的额定电压都等于直流输入电压。通过相位配置脉冲宽度调制，两种类型的高压晶体管和低压晶体管分别在低开关频率和高开关频率下工作。这对于减少开关损耗和选择半导体开关非常有益。这两个电容器并联连接，并与直流电源交替串联，从而产生具有多个电平的高交流输出电压，自平衡电容器电压以及低电压纹波。详细分析了拓扑，工作原理，电容器的电压纹波和功率损耗。仿真和实验结果均提供以证明所提出的逆变器的可行性。