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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They put on 55 before a switch to Ollie Rayner's off-spin brought the visitors fortune and Troughton, playing defensively at a leg-side delivery, lost his balance, the ball rebounding off Hodd's pads for a stumping.

BBC: Trott century keeps Bears in game