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基于ucc28180仿真问题

为什么我的GATE输出电压为几乎为0

设计要求:输入电压:85~265VAC;输出电压:400VDC;最大输出功率:80W;功率因数输:大于0.95。选择主电路所有元件,并给出元件清单;选择合适的控制芯片、驱动芯片;绘制装置总体电路原理图,软件仿真,绘制电路中各点的电压、电流的电压波形;编制设计说明。APFC6-20 - autosave 20-06-21 00_14.TSC