For high power system, every switch of three-phase inverter is actually made up of four MOSFETs in Parallel.
考虑到系统功率较大，三相桥式功率变换器的每个开关器件均采用四个MOS管并联的结构。
A discrete and nonlinear mathematical model of three-phase four-leg inverter is built up with the switch state functions based on the analysis of its working modes.
在分析三相四桥臂逆变器工作模态的基础上，引入开关状态函数建立了四桥臂逆变器系统离散的、非线性的数学模型。
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