The output current harmonic distortion of a three-level inverter is less than the traditional twolevel inverter.The voltage stress of the semiconductor switch is low.A neutral point potential drift control method is p...The output current harmonic distortion of a three-level inverter is less than the traditional twolevel inverter.The voltage stress of the semiconductor switch is low.A neutral point potential drift control method is proposed to solve the problem of the neutral point potential drift of the three-level inverter.The interaction mechanism between the neutral point potential and the space voltage vector is presented.The small vector output by the inverter is found to be the root cause of the midpoint potential drift.It is found that the fluctuation of the midpoint potential could be suppressed by increasing the capacitance value of the inverter bus voltage stabilizing capacitor.Furthermore,it inhibits the fluctuation of the midpoint potential.The experimental results verify the efficiency and precision of the proposed method.展开更多
重构了Ommic公司CGY2191UH芯片模型,建立了一个精确D波段放大器模块模型;并且设计和加工了一种D波段放大器模块验证了模型的准确性。D波段放大器模块模型包括多节波导模型、共面波导-矩形波导过渡模型、金丝键合线等效电路模型以及CGY21...重构了Ommic公司CGY2191UH芯片模型,建立了一个精确D波段放大器模块模型;并且设计和加工了一种D波段放大器模块验证了模型的准确性。D波段放大器模块模型包括多节波导模型、共面波导-矩形波导过渡模型、金丝键合线等效电路模型以及CGY2191UH芯片模型。通过对模型的分析并基于目前国内成熟工艺,设计和加工了一种D波段放大器模块。测试结果表明,该模块在110 GHz^140 GHz增益大于4.5 d B,其中最大增益在122 GHz为10 d B。增益测试曲线和模型仿真结果吻合,证明了模型的有效性。展开更多
基金the National Natural Science Foundation of China(No.51407007)。
文摘The output current harmonic distortion of a three-level inverter is less than the traditional twolevel inverter.The voltage stress of the semiconductor switch is low.A neutral point potential drift control method is proposed to solve the problem of the neutral point potential drift of the three-level inverter.The interaction mechanism between the neutral point potential and the space voltage vector is presented.The small vector output by the inverter is found to be the root cause of the midpoint potential drift.It is found that the fluctuation of the midpoint potential could be suppressed by increasing the capacitance value of the inverter bus voltage stabilizing capacitor.Furthermore,it inhibits the fluctuation of the midpoint potential.The experimental results verify the efficiency and precision of the proposed method.
文摘重构了Ommic公司CGY2191UH芯片模型,建立了一个精确D波段放大器模块模型;并且设计和加工了一种D波段放大器模块验证了模型的准确性。D波段放大器模块模型包括多节波导模型、共面波导-矩形波导过渡模型、金丝键合线等效电路模型以及CGY2191UH芯片模型。通过对模型的分析并基于目前国内成熟工艺,设计和加工了一种D波段放大器模块。测试结果表明,该模块在110 GHz^140 GHz增益大于4.5 d B,其中最大增益在122 GHz为10 d B。增益测试曲线和模型仿真结果吻合,证明了模型的有效性。
