| 摘要 |
This invention relates to an always-on uninterrupted power supply system mainly provided with a control unit to govern a power supply switch unit. When one of main power supply units or a bypass power supply unit of an external power device is to be installed or uninstalled for maintenance, a user can operate the control unit to enable the power supply switch unit to switch to the main power supply unit or the bypass power supply unit that is not to be installed or uninstalled to provide power for loads connected with the always-on uninterrupted power supply system to operate continuously, without interrupting the normal operation of the load. |
