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扩展坞标称PD功率是输入功率，实际给笔记本供电要扣除坞本身及外接设备耗电，标称90W实际输出笔记本通常只有85W左右，选购时预留10-15W余量

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Unverified扩展坞PD输入功率需比笔记本原装充电器高15-20W才能满速供电，如65W笔记本建议选PD输出≥85W的坞（扩展坞自身运行也耗电）92% similar UnverifiedPD直通存在功率损耗，扩展坞输出到笔记本的功率通常比标称输入低5-10W，购买时按'笔记本所需功率+15W'选PD输入规格91% similar Unverified笔记本反向供电（PD输出）需求下，扩展坞需自带独立DC适配器且PD输出功率≥90W才能带动15寸独显本；60-65W仅够轻薄本，机身满负载会掉电90% similar

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