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，MOSFET 的GS 电压经Vgg 对Cgs 充电而上升，在t1 时刻，到达维持电压Vth，MOSFET 开始导电；
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由供電設備 (PSE) 提供並傳輸至受電設備 (PD) 輸入端的 12.95W 功率是一種通用電源
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