| 摘要 |
The familiar power strip (200) or uninterruptable power supply (UPS) commonly used with personal computer systems (216) are supplied with an internal AC to DC power supply and a plurality of DC sockets (202, 205, 208, 211) at its face. The DC sockets (202, 205, 208, 211) are connected to the (DC) output of the power supply, via a resistor network, for supplying different DC levels at the sockets and the sockets are configured differently to mate with plugs of specified configuration keyed to the proper DC voltage level. The power supply has an input cable with a plug for connection to an in-the-wall socket and includes AC sockets (220, 221) electrically connected to that cable electrically in parallel to the resistor network for providing AC power at (AC) sockets (220, 221) at the face of the strip. According to another aspect, the UPS is equipped with circuitry which connects between the DC side of the AC/DC converter therein and a plurality of sockets on the face (202, 205, 208, 211) of the UPS for supplying DC voltage there. The UPS also is equipped with two batteries. One battery is connected between the DC side of the AC/DC converter and the DC side of a DC/AC converter both standard in prior art UPS devices. The other battery is connected between the DC side of the AC/DC converter and the DC voltage determining circuitry. The first battery provides back up for AC sockets (220, 211) in the UPS face; the second, back up for the DC sockets (202, 205, 208, 211) should an AC power failure occur. A single battery embodiment is also disclosed.
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