| 摘要 |
<p>An electrical distribution means auxiliary device for providing a substitute alternating current supply when the power from a domestic mains outlet fails. The auxiliary device comprises a mains failure sensor and switch-over unit (1) which detects when the mains fail and switches over supply to an apparatus from the mains to a supply provided by an inverter (4). The inverter (4) receives power from a rechargeable battery (7) and the battery (7) is continuously recharged by a battery charger (8) whenever the mains supply is available. An emergency shut-down and alarm circuit (6) is provided to activate an alarm when failure occurs and to disable the auxiliary device when the battery (7) becomes overloaded. The auxiliary device is designed so as to provide a relatively inexpensive means for detecting when power fails and generating a substitute AC supply.</p> |
