手机插在电脑USB充不上电是怎么回事？

696364

在前单位就发现过了，充得很慢很慢。明天插在台式机上，充电形态是有的，然而充了一会电量不升反降。回家间接用插座充就是正常的。为啥？USB接口5v的电压莫非不敷？

qishunyu

是充电电流过小，台式机只要500ma，充电器个别1－2A

ronin

有情理，然而电流不是主动的吗？按照电压和电阻才得出电流的？为何在家里的条记本上仍是能充上的呢？

lintao76513

主板纷歧样 好一点的主板带充电usb 有个闪电的标志

虫子

电压够，电流不敷，你开着机充更慢。当初的座充少数是2a的，电脑上个别就0.5a，假定一下手机开机亮屏任务时自动损耗0.5a，那末电脑就冲不进去了

jsgsgl

Have you tried all of the USB ports on your laptop?  Generally, only one of them will have adequate current to properly charge a smart phone.  Your port outputs 5.0 volts direct current; however, some laptops do not have the ability to delivery the current necessary to charge your your phone.  It will either not charge at all, or it will charge very slowly.

symaaa

情人节产生这个是坏兆头