| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve a problem that, because a USB port of an ordinary personal computer can only supply a power source of 5-v and 500 mA, if a plurality of USB peripheral devices operating on USB bus power are connected to a hub and used, the required current exceeds a permissible range of the supplied current, disabling the operation of the device in some cases, where it is required to connect an AC adaptor for supplying the power source, but purchasing the AC adaptor for connection is very troublesome and costly. <P>SOLUTION: In an internal circuit of the USB hub, a rechargeable battery and a double layer condenser are incorporated, thus adding a function that operates devices connected to the USB hub by adding charged electricity to the bus power if the current is insufficient. <P>COPYRIGHT: (C)2003,JPO</p> |
